CN113994792B

CN113994792B - Local self-vibrating disk furrow opener with three-dimensional spline curve fitting teeth

Info

Publication number: CN113994792B
Application number: CN202111384650.7A
Authority: CN
Inventors: 侯守印; 竹筱歆; 王星; 高广智; 纪文义; 陈海涛
Original assignee: Northeast Agricultural University
Current assignee: Northeast Agricultural University
Priority date: 2021-11-19
Filing date: 2021-11-19
Publication date: 2024-07-02
Anticipated expiration: 2041-11-19
Also published as: CN113994792A

Abstract

A local self-vibration disk furrow opener with three-way spline curve fitting teeth belongs to agricultural machinery, and mainly comprises a disk main body and furrow teeth, wherein the furrow teeth are uniformly distributed circumferentially by taking the geometric center of the disk main body as a circle center, are divided into left furrow teeth and right furrow teeth, and are adjacently and symmetrically distributed in a staggered manner according to the tooth surface shape. The ditching teeth comprise a front blade face, a rear blade face and spline curve fitting ABC faces, wherein an included angle delta between the front blade face and the radial line of the disc main body is 16-21 degrees, an included angle theta between the rear blade face and the radial line of the disc main body is 37.5-42.5 degrees, the spline curve fitting ABC faces are formed by sweeping and coupling special spline curves along the BA side of the front blade face and the BC side of the rear blade face, the front blade face has minimum tooth thickness, and ditching teeth follow the special spline curve rules with increasing trend from B to A and from B to C in the tooth thickness direction. The straw self-entering machine has the self-entering function, can effectively reduce the resistance of entering soil and cutting stubble, and prevents straw from being pressed into a seed ditch; the compaction of the trench walls and the trench bottom soil is avoided; the interdental generation area and the microscopic soil vibrate to loosen seed furrows, reduce ditching resistance and reduce soil adhesion.

Description

Local self-vibrating disk furrow opener with three-dimensional spline curve fitting teeth

Technical Field

The invention relates to a key component for a no-tillage seeding and fertilizing machine, belongs to the field of agricultural machinery, and mainly relates to a local self-vibration disk furrow opener with three-dimensional spline curve fitting teeth.

Background

The surface of the land has a large amount of crop stubbles during no-tillage seeding and fertilizing operation, the soil is sticky and heavy, and the compactness is higher. The no-tillage seeding, fertilizing and ditching mainly uses a disc ditcher, and the ditching force into soil by increasing the weight of the machine tool, so that the designed machine tool is heavy, the tractor is not matched reasonably, the soil compaction is serious and the like. Meanwhile, the disc furrow opener is easy to press the crop stubble into the seed furrow, so that the furrow wall and the furrow bottom are compacted, the contact between seed soil is not tight, and the emergence and the growth of seeds are seriously affected. The positive pressure between the disc furrow opener forced to enter the soil and the soil is increased, so that the soil on the surface of the furrow member is adhered under the condition of soil viscosity and weight, the furrow quality is reduced, and even the operation cannot be performed.

Disclosure of Invention

Aiming at the problems, the invention provides a local self-vibration disk furrow opener with three-way spline curve fitting teeth, which mainly comprises a disk main body and furrow teeth, wherein the furrow teeth are uniformly circumferentially arranged by taking the geometric center of the disk main body as a circle center, the furrow teeth are divided into left furrow teeth and right furrow teeth, and the furrow teeth are adjacently and symmetrically arranged in a staggered manner according to the tooth surface shape. The ditching teeth comprise a front blade face, a rear blade face and spline curve fitting ABC faces, wherein an included angle delta between the front blade face and the radial line of the disc main body is 16-21 degrees, an included angle theta between the rear blade face and the radial line of the disc main body is 37.5-42.5 degrees, the spline curve fitting ABC faces are formed by sweeping and coupling special spline curves along the BA side of the front blade face and the BC side of the rear blade face, the front blade face has minimum tooth thickness, and ditching teeth follow the special spline curve change rules with increasing trend from B to A and from B to C in the tooth thickness direction. The tooth-shaped structure of the local self-vibration disk furrow opener with the three-dimensional spline curve fitting teeth has a self-entering function, can effectively reduce the soil entering and stubble cutting resistance of the disk furrow opener, and prevents the seeds from being contacted with soil due to the fact that the straws are forced into the seed furrows; the special three-way spline curve fitting tooth surface can generate microscopic vibration on the surface of the trench wall, so that the compaction of soil on the trench wall can be effectively reduced, and the soil adhesion of the disc furrow opener is reduced; the ditching teeth 2 are adjacently and symmetrically arranged in a staggered mode and are coupled with the tooth surface shape to act together, and instantaneous stress on the left side and the right side in the advancing direction is unbalanced to generate vibration of the inter-tooth area, so that ditches can be effectively loosened, ditching resistance can be reduced, and soil adhesion can be reduced.

Drawings

FIG. 1 is a front view of a partial self-vibrating disk plow having three-way spline curve fitting teeth.

FIG. 2 is a partial isometric view of a partial self-vibrating disk plow having three-way spline curve fitting teeth.

FIG. 3 is an isometric view of a ditching tooth of a partial self-vibrating disk ditcher with three-way spline curve fit teeth.

Part number description in the drawings:

1. Disc main body 2, ditching teeth 3, left ditching teeth 4, right ditching teeth 5, front blade surface 6, rear blade surface 7 and spline curve fitting ABC surface

Detailed Description

The following describes the inventive embodiments in detail with reference to the drawings.

The utility model provides a local self-vibration disk furrow opener with three-dimensional spline curve fitting tooth, this part mainly comprises disc main part 1 and ditching tooth 2, and wherein ditching tooth 2 regards the geometric center of disc main part 1 as the centre of a circle circumference evenly to be arranged, and ditching tooth 2 divide into left ditching tooth 3 and right ditching tooth 4, and adjacent staggered symmetry arranges according to the flank of tooth shape. The ditching teeth 2 comprise a front blade surface 5, a rear blade surface 6 and a spline curve fitting ABC surface 7, wherein an included angle delta between the front blade surface 5 and the radial line of the disc main body 1 is 16-21 degrees, an included angle theta between the rear blade surface 6 and the radial line of the disc main body 1 is 37.5-42.5 degrees, the spline curve fitting ABC surface 7 is formed by sweeping and coupling special spline curves along the BA side of the front blade surface 5 and the BC side of the rear blade surface 6, the front blade surface 5 has the minimum tooth thickness, and the ditching teeth 2 follow the special spline curve change rule with the increasing trend from B to A and from B to C in the tooth thickness direction.

When the local self-vibrating disk furrow opener with three-way spline curve fitting teeth works, as shown in fig. 1, the local self-vibrating disk furrow opener moves along with a machine at a uniform speed in a linear manner, and performs anticlockwise rotary motion under the action of gravity and soil resistance, the design value of the radial included angle between the front tooth surface 5 and the disk main body 1 can ensure that the included angle between the front tooth surface 5 and the surface horizontal plane is always smaller than 90 degrees in the process from soil entering to soil exiting, namely, the ditching teeth 2 uniformly distributed in the circumferential direction of the disk main body 1 have a self-entering function, so that the weight of the machine can be effectively reduced, meanwhile, the tooth tips of the ditching teeth 2 are firstly contacted with the surface, the horizontal absolute motion speed of the ditching teeth is the same as the motion direction of the machine, and the ditching teeth 2 convey the surface straw forwards to prevent the straw from being pressed into a seed furrow. Because the front tooth surface 5 works before the rear tooth surface 6, the rear tooth surface 6 does not act with the ditch bottom, so that ditch bottom compaction and straw pressing into soil are effectively reduced, and seed emergence and growth are facilitated. As shown in fig. 3, the thickness of the ditching teeth 2 is narrow at the front and rear sides and narrow at the bottom and wide at the top in the working direction under the three-way spline curve fitting, the soil-entering capacity of the ditching teeth 2 is further improved, the left ditching teeth 3 and the right ditching teeth 4 are alternately and successively inserted into the soil at intervals in the rotating process of the disc main body 1, the spline curve fitting ABC surface 7 is alternately contacted with the soil left and right, the ditching teeth 2 are subjected to instantaneous unbalanced stress in the interval motion process, so that the soil generates regional vibration, and meanwhile, the spline curve fitting ABC surface 7 generates microscopic vibration in the interaction process with the soil, and the interdental local vibration formed by the mutual coupling of the regional vibration and the microscopic vibration not only plays roles of loosening the soil to prevent the soil from being compacted, but also plays roles of preventing the soil from adhering and reducing the ditching resistance. In conclusion, the invention has great innovation and wide practical value.

Claims

1. The local self-vibration disk furrow opener with three-way spline curve fitting teeth is characterized by comprising a disk main body (1) and furrow opening teeth (2), wherein the furrow opening teeth (2) are uniformly circumferentially arranged by taking the geometric center of the disk main body (1) as a circle center, and the furrow opening teeth (2) are divided into left furrow opening teeth (3) and right furrow opening teeth (4) which are adjacently and symmetrically arranged according to the tooth surface shape; the ditching teeth (2) comprise a front cutting edge surface (5), a rear cutting edge surface (6) and a spline curve fitting ABC surface (7), wherein an included angle delta between the front cutting edge surface (5) and a radial line of the disc main body (1) is 16-21 degrees, an included angle theta between the rear cutting edge surface (6) and the radial line of the disc main body (1) is 37.5-42.5 degrees, the spline curve fitting ABC surface (7) is formed by encircling spline curves along the BA side of the front cutting edge surface (5) and the BC side of the rear cutting edge surface (6), the front cutting edge surface (5) has minimum tooth thickness, and the ditching teeth (2) follow the spline curve change rule with increasing trend from B to A and from B to C in the tooth thickness direction; the tooth-shaped structure of the local self-vibration disc furrow opener with the furrowing teeth fitted with the ABC surface (7) by spline curves has a self-entering function, can effectively reduce the resistance of the disc furrow opener to entering soil and cutting stubble, and prevents the straw from being forced into a seed furrow to influence the contact of seeds and soil; the spline curve fitting ABC surface (7) can generate microscopic vibration on the surface of the trench wall, so that the compaction of soil on the trench wall is effectively reduced, and the soil adhesion of the disc furrow opener is reduced; the ditching teeth (2) are adjacently and symmetrically arranged in a staggered mode and are coupled with the tooth surface shape to act together, and the instantaneous stress on the left side and the right side in the advancing direction is unbalanced to generate vibration of the inter-tooth area, so that ditching can be effectively loosened, ditching resistance can be reduced, and soil adhesion can be reduced.