RU1813315C - Plowshare - Google Patents

Abstract

Usage: in agricultural machinery, in particular in soil tillage devices. The inventive device contains ploughshare blades, on which there are parallel discontinuous strips 1 - hardfacing from carbide material, which are located along the curve described by the equation Y X2 tg у / L cos у, where X and Y are the coordinates on the share, L is the length of the share ; y is the angle between the cutting edge of the share and its field edge. 1 ill.

Description

The invention relates to agricultural production, in particular to plow shares of tillage implements.

The purpose of the invention is to reduce pulling resistance and wear of a blade.

The drawing shows a plow share, where 1 is the zone of deposition of solid metal (surfacing is applied to the working surface of the share); 2 - remaining metal zones without surfacing; 3 - the relief of the blade after some exploitation; 4 is a curve characterizing the trajectory of the movement of soil particles over the working surface of the share and is described by the indicated equation.

Plow share works as follows.

During ploughshare operation, the non-melted portions 2 wear out more. As a result, the blade takes a crescent shape, which improves the self-sharpening of the share. In this case, a tooth is formed on the blade. The soil between the teeth is destroyed by less energy-intensive chipping, which reduces traction resistance. Particles of soil move along the working surface of the share along a specific path. Since parallel surfacing strips 1 are located along a curve characterizing the trajectory of soil particles along the ploughshare surface, soil particles experience frontal resistance of only the front faces of these strips 1. In this case, the side edges of deposited strips 1 are parallel to the direction of movement of soil particles and do not have frontal resistance . This reduces the area of frontal contact of the soil with the faces of the deposited strips 1 and reduces the soil compaction before them at the pull resistance of the share. By reducing the frontal contact area of the strips 1 with the soil, the wear of the blade is reduced. With this operation, the ploughshare achieves the same wear across the thickness of all strips 1, as a result of which the ploughshare is rejected simultaneously by completely worn-out deposited strips 1, which is economically advantageous and increases the service life.

With such parallel surfacing, the unmelted strip 2 of the blade will also be located along the path of the soil particles. This leads to a symmetrical wear of the strips 2 and to the formation of a symmetrical tooth configuration, as a result of which a uniform self-sharpening of the ploughshare is achieved.

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The law of motion of soil particles over the working surface of the share is considered for steady motion of the aggregate.

If initially the share of the ploughshare is arbitrarily positioned at the origin О of the X and Y coordinates, the X coordinate is directed in the direction of the ploughshare, and the Y coordinate is perpendicular to this direction (see, drawing), then the equation of the trajectory of the movement of soil particles along the working surface of the ploughshare in coordinate form ultimately has the form

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2Vn2

where ay is the acceleration of the relative motion of soil particles along the ploughshare working surface, caused by the inclination of the plowshare cutting edge to the direction of motion at an angle y and the imbalance of forces;

Vn is the translational speed of the share.

Associating ay with the design parameters of the share and making the necessary reductions, we finally obtain the equation of the trajectory of the movement of soil particles along the working surface of the share

Y X2 tg у / L cos у, where Y and X are the coordinates of the curve on the share;

L is the share length;

, y is the angle between the cutting edge of the share and its field edge.

Using this equation, for specific parameters L and at the share, it is possible to construct a curve characterizing the trajectory of the movement of soil particles along the working surface of the share. The curve of adjacent deposition sections is constructed by parallel transfer of the coordinate system with (X oV).

Claims (1)

The claims A plow share containing a working surface with a blade on which there are parallel strips of carbide material, characterized in that, in order to reduce the tensile resistance and wear of the blade, the contours of each strip of carbide material intersecting the cutting edge of the blade are each along the curve described the equation  tgy / Lcosy, where X and Y are the coordinates of the curve on the share; L is the length of the share; y is the angle between the cutting edge of the share and its field edge, while the center of the curve is located at the toe point of the share, and the X coordinate is directed along its field edge.