RU175444U1 - DISC HARROW WORKING BODY - Google Patents

Abstract

The device relates to the working bodies of tillage machines, in particular to the working bodies of disk harrows. The technical result of the proposed device is to increase its strength while ensuring self-sharpening of the cutting edges. At the working body of the disc harrow, including a spherical disk with cutting edges and a mounting hole in the central part, the cutting edges are made in the form of flat petals that smoothly mate with the spherical disk and are located in the planes of its rotation, while the cutting edges on the convex side of the spherical disk have a sharpening, and on the opposite side they are hard-wearing alloy hardfacing vom.

Description

The device relates to the working bodies of tillage machines, in particular to the working bodies of disk harrows.

The working body of a disk harrow is known (patent RU 2220520, published January 10, 2004), including a spherical disk with teeth cut out so that the cutting edges of the teeth of the disk are made in a logarithmic spiral given by the formula ρ = ρ ₀ ⋅q ^{ϕ / 2π} (where ρ ₀ = 106; q = 4), while the initial radius ρ ₀ and the growth coefficient of the logarithmic spiral q of the front and rear cutting edges are the same.

The disadvantage of the known working body of the disk harrow is the complex geometry of the cutting teeth, which makes it difficult to sharpen the cutting edge in the process, a great resistance to cutting the soil.

Known working body of the disk harrow (patent RU 82508, published 05/10/2009), made in the form of a spherical disk with V-shaped cutouts located on the periphery with equal intervals and having cutting edges. The cuts are made in the form of isosceles triangles with an angle α≤130 °, while the vertices of the triangles are directed to the center of the disk to a depth of not more than one and a half bevel widths of the disk sharpening, and the cutting edges of the disk are sharpened from the outside and made self-sharpening by hardfacing from the inside of the disk .

The disadvantage of this device is the complexity of the geometric shape of the cuts, the difficulty of sharpening the cutting edges of these cuts and a great resistance to cutting the soil.

The closest in nature and taken as a prototype is a spherical disk of a tillage implement (patent RU 2381639, published 02.20.2010), having a cutting edge, slots and a mounting hole in the central part for mounting and fixing the bearing housing or axis. The slots are made in the form of a curved quadrangle with radial sides made along a curve, for example, of a parabolic shape, with the curved radial sides of the convex side oriented in the direction of rotation of the disk.

The disadvantages of the prototype are the difficulty of sharpening the cutting edges, the low strength of the spherical disk due to the non-integrity of its design.

The technical result of the proposed device is to increase its strength while ensuring self-sharpening of the cutting edges.

The technical result is achieved by the fact that the working body of the disk harrow, including a spherical disk with cutting edges and a mounting hole in the central part, has cutting edges made in the form of flat petals located in the plane of its rotation and smoothly mating with the spherical disk, while the cutting edges with the convex sides of the spherical disk have sharpening, and on the opposite side they are hardfaced with hard wear alloy.

In FIG. 1 shows a side view of the working body of the disk harrow. In FIG. 2 shows a section AA of the working body of a disk harrow.

The working body of the disk harrow contains a spherical disk 1 with cutting edges 2 located at the periphery of the spherical disk 1 at equal intervals, and a mounting hole 7 in the Central part. The cutting edges 2 are made in the form of flat petals, smoothly mating with the disk spherical 1, and are located in the plane of rotation of the disk spherical 1. The cutting edges 2 from the convex side 3 of the disk of spherical 1 have a sharpening 4, and on the opposite side 5, surfacing with a hard wear-resistant alloy 6. Due to the presence of hard-wearing hard alloy 6, the cutting edges 2 are self-sharpening.

As a hard wear-resistant alloy, VK6 hard alloy can be used according to GOST 3882.

The working body of the disk harrow works as follows. Several working bodies of a disk harrow are installed on the harrow. By dragging the harrow over the surface of the soil and its own mass, the spherical disks 1 cut into the soil to a depth determined by the weight of the harrow, which can be changed by ballast (not shown in Figs. 1 and 2), and rotate. The cutting edges of the 2 spherical disks 1, made in the form of petals, smoothly mating with the spherical disk 1 and located in the plane of its rotation, cut the soil layer and plant debris, perceiving resistance and load when meeting with solid inclusions. The soil layer due to the rotation of the spherical disk rises, crumbles, partially turns and is laid aside.

Due to the fact that the spherical disk 1 and the cutting edges 2 are smoothly mated (without sharp protrusions and depressions), the strength of the device is increased by minimizing the stress concentration at the point of change in the geometric shape of the spherical disk 1. The location of the cutting edges 2 in the plane of rotation of the device facilitates cutting soil cover.

The presence on the cutting edges 2 from the concave side 5 of the disk of a spherical 1 hardfacing of hard wear-resistant alloy 6 provides an increase in the strength of the cutting edges 2 and their self-sharpening during operation.

BIBLIOGRAPHY

1. Patent RU 2220520. The working body of the disc harrow. IPC: А01В 7/00, А01В 21/08. Published: January 10, 2004

2. Patent RU 82508. The working body of the disc harrow. IPC: А01В 23/00. Published: May 10, 2009

3. Patent RU 2381639. Disc spherical tillage implement. IPC: А01В 15/16, А01В 23/06. Posted: 02/20/2010

Claims (1)

The working body of the disk harrow, including a spherical disk with a cutting edge, an mounting hole in the central part, characterized in that the cutting edges are made in the form of flat petals located in the plane of its rotation and smoothly mating with the spherical disk, while the cutting edges are on the convex side of the disk spherical have sharpening, and on the opposite side - surfacing with hard wear-resistant alloy.

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