RU2220520C1 - Working tool for disk harrow - Google Patents

Abstract

FIELD: agricultural engineering. SUBSTANCE: working tool has spherical cut-out disk for soil tillage. Disk has teeth whose cutting edges are extending in logarithmic spiral set by formula ρ = ρ_o•q^φ/2π, (where ρ_o = 106; q = 4). Initial radius ρ_o and logarithmic spiral growth coefficient q are equal for internal and external teeth edges. Disk is made continuous to improve service life. EFFECT: reduced soil and plant remains shear resistance and decreased cost of soil tillage. 2 cl, 2 dwg

Description

 The invention relates to agricultural machinery, in particular to the working bodies of disk harrows.

 Known working body of the disk harrow, consisting of spherical disks mounted on the axis, having cutouts and protrusions on the cutting edge, and cutting elements. Each of the cutting elements has the shape of a curved triangle. The trailing and leading edges of the cutting element are made in an arc of a circle. The disadvantages of this working body are the great resistance to soil cutting and the low strength of the disc due to its non-integrity [1].

 Known working body of the disk harrow, consisting of a spherical disk, on the edge of which are fixed working elements in the form of knives with a cutting edge made in a spiral of Archimedes. The disadvantages of this working body are the great resistance to soil cutting and the low strength of the disc due to its non-integrity [2].

 The objective of the invention is to reduce resistance to soil cutting and increase the strength of the disk.

 This is achieved by the fact that the working body is made in the form of a solid spherical disk with cut teeth, and the inner and outer edges of the teeth are made in a logarithmic spiral.

 In FIG. 1 shows a general view of a spherical cut out disk; figure 2 shows a section aa in figure 1.

The spherical disk 1 contains protrusions (teeth) 2. The front cutting edge 3 and the rear cutting edge 4 of the teeth 2 are made according to a logarithmic spiral given by the formula ρ = ρ _o • q ^{φ / 2π} , where ρ is the radius of curvature of the logarithmic spiral; φ - is the angle of rotation of the radius vector when constructing the spiral; ρ _o - the initial radius of the spiral; q is the growth coefficient of the logarithmic spiral; and ρ _o = 106, q = 4. Moreover, the initial radius ρ _o and the growth coefficient of the logarithmic spiral q of the front cutting edge 3 and the rear cutting edge 4 are the same.

 The technological process performed by the disk is as follows. The tractor driver brings the unit to the designated area, puts it in the specified direction, puts the implement into working position and moves the discs across the field. By dragging the discs over the surface of the field and their own mass, they crash into the soil and rotate. Cutting edges of the discs cut and raise the soil layer, crumble it, partially wrap it and take it to the side.

 Directly cutting edge of the disk cut the soil and plant debris, perceiving resistance and stress when meeting with solid inclusions.

 The shape of the cutting edges of the teeth of the disc reduces the resistance to cutting of soil and plant debris. Since the disk is made integral, without sharp protrusions and depressions, this increases its margin of safety.

Sources of information
1. USSR author's certificate 1701127, A 01 B 23/06, 1991.

 2. Copyright certificate of the USSR 929023, A 01 B 21/02, 1982.

Claims (2)

1. The working body of the disk harrow, including a spherical disk with cut teeth, characterized in that the cutting edges of the teeth of the disk are made in a logarithmic spiral given by the formula ρ = ρ _о · q ^{φ / 2π} , where ρ _о = 106; q = 4, while the initial radius ρ _about and the growth coefficient of the logarithmic spiral q of the front and rear cutting edges are the same. 2. The working body of the disk harrow according to claim 1, characterized in that the disk is made integral.

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