SU1722267A1 - Flat hoe working tool - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to agricultural machinery and can be used in the working bodies of flat-cutting legs. The invention makes it possible to improve the quality of soil crumbling and increase the service life. The working body of the flat-cutting paw contains a shoe 2 mounted on a rack 1 with double-sided share 3 and a chisel 4 fixed on it, while the cut-outs between the teeth 5 of the rear gnawing 6 parts of the share plow blades are shaped according to a logarithmic spiral with cut-off curvature decreasing m plowshares, opposite to the increase in the curvature of the logarithmic spiral, cuts between the teeth of the cutting part of the plowshares. The opposite orientation of the radii of the logarithmic spiral in the crumbling 6 and the cutting 7 parts of the plowshare contributes to the creation of different concentrations of pressure across the width of the notches. 1 h. item f-ly, 2 ill. Yo

Description

The invention relates to agricultural machinery, in particular to working bodies for tillage.

A working tool for tillage is known, including a knife and a stand with a rectilinear cutting edge, having a one-sided sharpening, a concave side face on the sharpening side, and loosening elements in the form of notches of conical shape with wedge-shaped plates. The disadvantage of such a working body is low soil loosening due to the lateral shift of the soil layer and intense deformation to the concave surface. This working body has a large traction resistance due to the shift of the soil resistant to one of the sides and the lifting of the soil and the shift of its wedge-shaped plates.

Also known is a soil-cultivating working body containing a stand and a loosening paw with a cutting blade, made on a logarithmic curve.

The blades of such a working body, having no protrusions and notches on the back of the shares, do not ensure the occurrence of pressure concentration zones on the layer of soil that converges from the shares of the shares and does not contribute to its intensive crumbling. Such a plowshare has a short service life, since it has one front toothed cutting part, and when it is worn, there is no second toothed cutting part to replace the worn out one.

The purpose of the invention is to improve the quality of soil crumbling and increase the service life of the working body.

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The goal is achieved by using a toothed-crumbling working body of a flat-cutting foot containing double-toothed sharers with a front toothed undercutting part, a rear toothed crumbling part, and cuts between the teeth of the crumbling part in the shape of a logarithmic spiral.

FIG. 1 shows the proposed working body flat-paw, top view; in fig. 2 is a section of undercutting and crumbling part of the working body.

The working body of a flat-cut paw contains (Fig. 1) a shoe 2 mounted on a rack 1 with double-toothed sharers 3 and a chisel 4 fixed to it. The cuts between the teeth 5 of the rear crushing part 6 of the shares are made according to the shape of a logarithmic spiral with a curvature The cuts diminishing towards the edges of the shares are opposite to the increase in the curvature of the logarithmic spiral 7, which describes the shape of the cuts between the teeth of the cutting part of the shares. Such an implementation of cutouts of plowshares in the crumbling part contributes to the destruction of the soil with a slip in the cuts with minimal resistance and eliminates clogging of the cuts in the crumbling part. The opposite orientation of the radii of the logarithmic spiral in the crumbling 6 and the cutting 7 parts of the plowshare contributes to the creation of different concentrations of pressure across the width of the cuts in the cutting and crumbling parts. In the notches of the cutting part, the ground cut by the teeth slides towards the edges of the coulter, i.e. in the direction of decreasing the radius of the logarithmic spiral, creating a concentration of stresses centered at the pole. These stresses in the cropped soil layer are removed in the notches of the crumbling part, where the soil also slides to the edges of the ploughshare, but in the direction from the pole of the logarithmic spiral as it unfolds and increases the radius of the vector.

The frontal contour of the teeth is made in the form of logarithmic spirals which are smoothly mated to each other, symmetric about the longitudinal axis of the plowshare. The convexity of the logarithmic spiral in the front of the 8 teeth of the plowshares is facing downwards, and in the back of the 9 teeth of the shares of the plowshares - upwards. Such a working surface contributes to the occurrence of a bending moment acting in the longitudinal direction on the cut layer of soil, together with sliding along the crumbling surface of the ploughshare, leading to intensive crumbling of the soil.

In the transverse direction, bending moments of different directions from the left and right parts of each tooth 3 also act on the layer of soil converging from the coulter.

due to the transition of the working surface of the teeth of the crumbling part of the plowshares in the notches 6 between them. This increases the intensity of the crumbling of the soil in the transverse direction to the movement of the working body. In the process of work, the front-toothed undercut part of the plowshares is subjected to the most intensive wear. In the proposed working body, as the toothed undercut is worn, it is possible to turn

5 180 ° right and left toothed sharers and attach to the shoe for operation of the rear toothed crumbling part as the front toothed undercutting part of the shares. Symmetry of cutouts and workers

The 0 surfaces of the undercutting and crumbling parts of the plowshare, as well as the mounting holes, allow such rearrangement in order to increase the durability of the plowshares of the working body of the flat-cut paw. A smaller perimeter of curvilinear blade contact with the rear crumbling part of the share plowshare has a positive effect on crumbling as compared to solid plowshares.

0 During the movement of the working body of the plowshare 3, the layer of soil is cut by the cutting part of the teeth 5, which is made downward along the logarithmic spiral 8. Under the action of teeth 5, the soil bonds are broken and it

5 slides in notches 7 and 8 teeth on any surface. The soil layer enters the wavy crumbling surface of plowshares, made in the form of logarithmic spirals 8 and 9 of different convexities, and

0 also cutouts 6. Under the action of alternating transverse and longitudinal forces in the crumbling part of the shares, the soil is intensively crushed. Cutouts 6 in the crumbling part of plowshares contribute to soil slipping in

5 in the direction of increasing the radius of the logarithmic spiral and the rapid descent of the soil from the working organ.

As the front cutting blade is worn, it is necessary to remove the plow blades, turn them through 180 °, install them on the shoe and fasten.

The use of the proposed working body of the flat-cut paw will increase the intensity of the impact on

5 soil, which provides improved soil structure and increases the service life of flat-cut paws.

Claims (2)

Claim 1. The working body of a flat-cut foot, containing a shoe, chisel and blades, the front edge of which is made with cutouts in the form of a logarithmic spiral with a curvature of cutouts in the cutting part, increasing to the edge of the blade, characterized in that, in order to improve the quality of soil crushing and increase the service life, the rear edge of each plowshare is cut with a logarithmic spiral, with a curvature opposite to the curvature of the leading edge cuts, at 0 than the curvature of the cut edges of the trailing edge is made decreasing towards the edges of the blade. 2. working body pop. 1, about t of l and-ch and yu-sh and and with that. that the working frontal surface of the plowshares is made in the form of symmetrical about the longitudinal axis of the plowshare, smoothly conjugated logarithmic spirals, the convexity of the front of which is facing down, and the rear - up. Fiá.1 T,