JP2017063691A - Tilling claw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tilling claw superior in reversibility, plowing properties and soil crushing properties, the tilling claw that mitigates general load change particularly in tilling and can maintain tilling performance even in any kind of soil.SOLUTION: A tilling claw includes: a base part (1) installed in a rotational claw shaft (S); a vertical blade part (2) to a horizontal blade curve starting part (F) continuously extended from the base part (1) to the vertical lower part; and a horizontal blade part (3) curved in the direction opposite to the rotation direction from the vertical blade part (2), and comprising a curved plate curved in one direction to the base part (1) and continuously extended using the horizontal blade curve starting part (F) as a boundary. The vertical blade part (2) and the horizontal blade part (3) are characterized by including a back side curve region curved to the one direction side from the cutting edge side to the back side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tilling nail that cultivates soil.

  As a conventional tilling nail shape, there is a side view shape as shown in FIG. 5 (however, a surface whose normal is the axial direction of the rotating nail shaft is a side surface). The tilling nail extends from the base 10, the vertical blade portion 20 made of a flat plate from the base 10 to the horizontal blade tip portion curve start portion F, and the horizontal blade tip portion curve start portion F as a boundary, and extends in one direction. And a horizontal blade portion 30 made of a curved plate that is curved at a curvature radius r1 (see Patent Document 1).

  In such a tilling nail, the first elevation angle α and the second elevation angle β are set to be within 5 degrees in order to suppress the angle change of the elevation angle at the blade edge until the use limit. The first elevation angle α indicates the elevation angle of the horizontal blade portion 30 before starting tilling (the blade edge is not worn), and the second elevation angle β indicates the elevation angle of the blade portion at the use limit. It is. The first elevation angle α and the second elevation angle β are set as follows.

  In the tillage nail, as shown in the figure, from a reference surface that is curved in one direction with the surface having the rotation axis S0 of the rotation nail shaft S as a normal as a side surface and the surface of the base 10 in a plan view. Is the total bending height H1. A line parallel to the tangent line G of the horizontal blade portion bending start portion F, which is an intermediate position of the total bending height H1 and passes through the middle point J, which is an intermediate position of the thickness of the horizontal blade portion 30, is a parallel line. Let G1. Further, the intersection of the tangent arc F1 in contact with the parallel line G1 and the center of the edge is defined as K. At this time, the angle formed by the line T connecting the blade edge intersection K and the rotation axis S0 and the first tangent V of the tangent arc F1 passing through the blade edge intersection K is defined as a first elevation angle α.

  Further, when the intersection between the tangent arc F1 and the center of the upper edge of the horizontal blade portion 30 is defined as the upper edge merging point M, the use limit is located at a predetermined distance below the upper edge merging point M and on the tangent arc F1. The angle formed by the line T1 connecting the point N and the rotation axis S0 and the second tangent line V1 of the tangent arc F1 passing through the use limit point N is a second elevation angle β.

Japanese Patent Application No. 2014-052707

  However, in the above-mentioned tilling nail, it is a tilling nail excellent in reversibility, squeezing property and soil breaking property, but as shown in FIG. 6, at the time of tilling at the position W1 and tilling depth W2 of the tilling nail with respect to the soil, When the horizontal blade portion 30 is driven after the vertical blade portion 20 up to the horizontal blade portion bending start portion F is driven into the soil, the load fluctuation becomes large, thereby increasing the horsepower load and vibration. It was a thing.

  In addition, when tilling soil with strong viscosity, the tillage claws are in the above-mentioned shape, so that the soil is embraced, and there is a concern that the throwing ability may be reduced by tilling in that state. .

  Therefore, the present invention solves such problems, and is a tilling claw excellent in reversibility, squeezing property, and crushed soil, and alleviates the overall load fluctuation particularly during tilling, It is an object of the present invention to provide a tilling nail that can maintain tillage performance in any soil.

  In order to solve the above-mentioned problem, the tilling claw according to claim 1 of the present invention includes a base attached to the rotary claw shaft and a vertical blade extending from the base to the horizontal blade portion curve starting portion extending vertically downward. A horizontal portion comprising a blade and a curved plate that is curved in the direction opposite to the rotation direction from the vertical blade portion and is curved in one direction with respect to the base portion and extends continuously from the horizontal blade portion curve start portion. A blade portion, and the vertical blade portion and the horizontal blade portion include a back-side curved region that curves toward the one-direction side from the blade edge side to the back portion side.

  Moreover, the tilling nail according to claim 2 of the present invention is the tilling nail according to claim 1, wherein the back side curved region is configured by a vertical blade side curved line and a horizontal blade side curved line. The vertical blade portion and the back-side curved region are defined by a vertical blade-side curved line located on the back portion side of the upper end of the portion or the blade portion.

  Moreover, the tilling nail according to claim 3 of the present invention is the tilling nail according to claim 2, wherein the horizontal blade side curve line is orthogonal to the horizontal blade portion curve start portion.

  Moreover, the tilling nail according to claim 4 of the present invention is the tilling nail according to claim 2, wherein the vertical blade portion curve line has at least an arc portion, and the horizontal blade side curve line is It is a tangent to the arc portion and is orthogonal to the side blade portion curve start portion.

  In the tillage nail of the present invention, compared to the conventional tillage nail, since the vertical blade portion, the back side curved region, and the horizontal blade portion act on the soil in order when driven, the back blade side before the horizontal blade portion acts on the soil. The soil can be cultivated in the curved region, and the horizontal blade portion can be cultivated smoothly. Thereby, the whole load fluctuation | variation at the time of tilling can be relieved, and various tillage performances, such as reversibility, squeezing property, and soil breaking property, can be improved.

  Further, even when soil with strong viscosity is cultivated, it is possible to cultivate the soil without embracing the soil by the back side curved region, so that the release property can be improved. In other words, it is more excellent in reversibility, squeezeability, and crushed soil than conventional tillage claws, and it alleviates overall load fluctuations, especially during tillage, and can be used in any soil. Can be maintained.

It is a side view and a top view of a tilling nail in the example of the present invention. It is the schematic during the cultivation work of the cultivation nail | claw in the Example of this invention. It is each sectional drawing explaining the back part side curvature area | region of the tilling nail | claw in the Example of this invention. It is a side view of the tilling nail in another example of the present invention. It is a side view of a conventional tillage nail and a partial AA sectional view. It is the schematic during the tilling operation | work of the conventional tilling nail.

  Hereinafter, a tilling nail in an embodiment of the invention is explained based on a drawing. In the tillage nail, a surface that faces the rotation trajectory of the rotation claw axis S, that is, a surface that has the rotation axis of the rotation claw axis S as a normal line is a side surface. In the side surface, when the vertical blade portion extends vertically downward, the surface facing the extending direction in which the horizontal blade portion 3 extends in the horizontal direction from the vertical blade portion 2 is defined as the front direction. In addition, it is curving in the right direction when viewed from the front (not shown). Moreover, as shown in FIG. 1, it curves to the near side toward the side view.

  As shown in FIG. 1, the tilling claw according to the present invention includes a base 1 attached to the rotary claw shaft S, a vertical blade 2 extending vertically downward from the base 1, and a vertical blade 2 to a horizontal blade. A horizontal blade portion 3 extending continuously from the bending start portion F as a boundary is integrally formed. The base 1 is a flat plate, and the partial region of the vertical blade 2 and the horizontal blade 3 are curved plates.

  The base 1 is mounted by being attached to the rotary claw shaft S at the attachment center. At the attachment center, an attachment hole 1h for attachment to the rotary claw shaft S is provided at the center in the side view width direction. That is, the center of the attachment hole 1h in the side view is the attachment center. One or a plurality of attachment holes 1h may be provided. In the case of a plurality of attachment holes 1h, the attachment center may be the center of the lowest attachment hole 1h or the center of the attachment hole 1h at the center in the vertical direction when viewed from the side.

  Moreover, let the side surface on the opposite side to a curving direction among the both sides | surfaces of the base 1 be a reference surface (refer FIG. 1). As shown in the figure, the reference surface is a reference for the total bending height H1 in which the side blade portion 3 is bent by the first bending curvature radius r1.

  The vertical blade portion 2 refers to a region from the base portion 1 to the horizontal blade portion bending start portion F that extends vertically downward and extends mainly in the vertical direction. The vertical blade portion 2 is mainly composed of a flat plate whose thickness is gradually reduced from the base portion 1 to the horizontal blade portion curve start portion F, and has a region that is partially curved toward the horizontal blade portion curve start portion F. It becomes. This area is a back-side curved area, which will be described later. Moreover, the said vertical blade part 2 has a blade which continues to a lower side edge and a lower edge. The side view shape of the vertical blade portion 2 mainly extends in the vertical direction while bending in the horizontal direction (leftward in FIG. 1) from the blade edge starting end O which is the horizontal direction start portion of the vertical blade portion blade edge. The side edge shape of the vertical blade portion 2 is smoothly bent from the blade edge starting end O in the oblique side view direction.

  The horizontal blade portion 3 refers to the entire region from the horizontal blade portion curve starting portion F to the tip, and is composed of a curved plate that is continuously bent in one direction with respect to the reference plane. The curved plate also has a curved shape that bends upward toward the tip in a side view. That is, it is connected to the vertical blade portion 2 with the horizontal blade portion bending start portion F as a boundary, extends mainly in the lateral direction in a side view, bends upward, and further curves in a plan view. The horizontal blade portion 3 has a back-side curved region in the same manner as the vertical blade portion 2. The back side curved region of the horizontal blade portion 3 is the entire region from the horizontal blade portion bending start portion F to the tip.

  The horizontal blade portion bending start portion F is formed in a straight line as shown in FIG. And when the intersection with the blade edge 2a in the horizontal blade portion curve start portion F is I, the horizontal distance from the vertical line passing through the attachment center of the attachment hole 1h of the base portion 1 to the intersection I in the side view is the curve start horizontal distance. Let L be. The horizontal distance from the vertical line passing through the mounting center of the mounting hole 1h to the lateral tip position Q1 of the horizontal blade portion 3 is defined as the total lateral length B. At this time, the bending start horizontal distance L is set to be approximately half of the total lateral length B. More specifically, the ratio of the total lateral length B to the bending start horizontal distance L is set to be about 1: 0.4 to 0.6.

  A line that passes through a midpoint J that is an intermediate position of the total bending height H1 and that is an intermediate position of the thickness on the blade edge 2a side in the horizontal blade portion 3, and is parallel to the horizontal blade portion curve start portion F. Is the parallel line F1, and the intersection of the parallel line F1 and the center of the blade edge 2a is the blade edge intersection K. At this time, the angle formed between the line T connecting the blade edge intersection K and the rotation axis S0 and the parallel line F1 is the first elevation angle α.

  Also, a line parallel to the horizontal blade portion curve start portion F, which passes through the middle point M, which is an intermediate position of the total bending height H1 and is the intermediate position of the thickness on the back portion 2b side of the horizontal blade portion 3, is provided. Let it be the parallel line F2, and let the intersection of the parallel line F2 and the center of the back part 2b be the back part intersection M1. A curve passing through the back intersection point M1 and passing through the intermediate position of the total bending height H1 from the blade edge intersection point K of the side blade portion 3 is defined as a curve G. Then, a line T1 connecting the use limit point N located on the curve G and the rotation axis S0 at a predetermined distance below the back intersection M1 and a tangent line of the curve G passing through the use limit point N are formed. The angle is the second elevation angle β. The first elevation angle α indicates the elevation angle of the horizontal blade portion 3 before the start of tillage (the blade edge is not worn), and the second elevation angle β indicates the elevation angle of the blade portion at the use limit. is there.

  At this time, in the horizontal blade portion 3, the angle change between the first elevation angle α and the second elevation angle β is set to be within 5 degrees. More preferably, the first elevation angle α and the second elevation angle β are set to be substantially the same angle, and the ratio between the first elevation angle α and the second elevation angle β is set to 1: 1 to 1.1. . Further, the angle formed between the horizontal line passing through the intersection I and the side blade portion bending start portion F is the bending angle γ, and the bending angle γ is set to be approximately 90 degrees or less than approximately 90 degrees.

(Relationship between bending start horizontal distance L and first bending radius of curvature r1)
It is desirable that the first curvature radius r1 is set to be larger than the curvature start horizontal distance L when the surface having the normal axis to the rotation axis of the rotary claw shaft S is defined as the side surface. As a result, in the relationship between the total lateral length B and the bending start horizontal distance L, the length of the horizontal blade portion 3 can be increased, and the horizontal blade portion 3 can be shaped to be greatly curved, and plowed and released. Property is improved.

(Overall shape in side view)
As shown in FIG. 1, the overall shape of this tilling claw is a vertical distance from the lowermost edge of the blade edge 2a to the lateral tip position Q of the edge of the side blade portion, as shown in FIG. When the vertical distance from the mounting center of 1h to the lowest edge of the tilling claw is the total longitudinal length C, the ratio of the tilling escape length A, the total lateral length B, the total vertical length C, and the bending start horizontal distance L is one pair. About 2.5 to 4.5 to 1.5 to about 3 to 1 to 2.5.

(Side view edge shape)
The blade edge shape from the blade edge starting edge O, which is the horizontal direction start part of the vertical blade part edge, to the horizontal tip position Q of the horizontal blade part blade edge, is continuously non-circular, with the curvature continuously changed. It consists of a curve. In addition, if the said curve is a non-circular arc as a whole, a plurality of circular arc curves may be connected.

  When the distance from the rotation axis S0 of the rotary claw shaft S to an arbitrary blade edge 2a is set as the blade edge distance R, the blade edge distance R continuously changes in accordance with the lateral position of the blade edge 2a in a side view. It becomes. Furthermore, in the blade edge 2a of the horizontal blade portion 3 extending in the lateral direction when viewed from the side, the maximum blade edge distance Rm is obtained at the midway position in the horizontal direction. The blade edge position of the horizontal blade portion 3 having the maximum blade edge distance Rm is defined as the maximum blade edge position P.

  The vertical length in the vertical direction of the blade is such that when the length from the starting position of the blade in the vertical blade 2 to the lowest part of the claw is the blade vertical length E, the blade vertical length E is 0. It is set to be about 2 to 0.5.

  As shown in FIG. 1, this tilling claw is a double-blade claw in which blades are formed from both side surfaces in the bending direction of the horizontal blade portion 3, but the present invention is not limited to this. A single-blade claw with a blade formed only on the side surface may be used, or a single-blade claw with a blade formed only on one side surface in the direction opposite to the bending direction of the horizontal blade portion 3 may be used. Further, for example, the vertical blade portion 2 can be a double-blade claw, the horizontal blade portion 3 can be a single-blade claw, the vertical blade portion 2 can be a single-blade claw, and the horizontal blade portion 3 can be a double-blade claw. That is, a combination of a double-blade claw and a single-blade claw may be used.

(Curved)
The horizontal blade portion 3 is bent in one direction by combining one or a plurality of different bending radii. That is, the base 1 (base end) side curvature rate and the side blade tip end (nail tip) side curvature rate are differently formed adjacently and smoothly. Further, when the horizontal blade portion 3 is curved by combining one or a plurality of different bending radii, one or a plurality of linear portions may be combined at an appropriate location.

  Further, as shown in FIG. 1, the bending height H2 from the reference surface at the blade edge position (maximum blade edge position P) of the horizontal blade portion 3 where the rotation radius R of the rotary claw shaft S becomes the maximum value Rm is It is about half or more than half of the total bending height H1 at the lateral tip position Q2 on the bending direction side of the blade portion 3.

  Moreover, as shown in FIG.1 and FIG.3, the vertical blade part 2 and the horizontal blade part 3 are the back part side which curves to the one direction side of the same direction as the horizontal blade part 3 from the blade edge 2a side to the back part 2b side. A curved region is provided. The back portion side bending region is bent with the back portion side bending start portion U as a boundary. The back portion side curve starting portion U includes a vertical blade side curve line U1 formed on the side of the vertical blade portion 2 up to the horizontal blade portion curve starting portion F excluding the base 1, and a horizontal blade portion curve starting portion F. It is comprised from the side blade side curve line U2 formed in the side blade part 3 side.

  The vertical blade side curve line U1 is located on the back portion 2b side from the upper end of the blade portion or the upper end of the blade portion, and curves the back portion 2b side of the vertical blade portion 2 in the right direction in a front view. That is, it is curved with the second curvature radius r2 in a direction orthogonal to the reference plane. More specifically, when the line passing through the center of the thickness of the horizontal blade portion 3 on the reference surface side in the plan view is the horizontal blade portion center line, the horizontal blade portion 3 is in the horizontal blade portion bending direction and in the plan view. And curved in a plane direction perpendicular to the center line of the horizontal blade portion. In other words, as shown in the BB cross-sectional view and the CC cross-sectional view of FIG. 3, the back portion 2 b side of the vertical blade portion 2 is curved toward the front side in a side view.

  At this time, the second curvature radius r2 may be a combination of one or a plurality of curvature radii. For example, different curvature radii such as gradually increasing or decreasing from the vertical blade portion 2 side to the horizontal blade portion 3 side can be combined, or different such as gradually increasing or decreasing from the blade edge 2a side to the back portion 2b side. It is possible to combine the radii of curvature. Of course, the back side curved region can be curved by appropriately combining these radii of curvature.

  Thereby, it can be set as the shape which curved the vertical blade part 2 from the blade edge 2a side to the back part 2b side, and the vertical blade part 2 and the back side curved area | region can be divided by the vertical blade side curve line U1. it can. At the time of plowing, when the vertical blade portion 2 is driven, the soil cut by the blade edge 2a is moved in the right direction of the front view (front side of the side view) in the back side curved region. be able to.

  Further, the vertical blade side curve line U1 is formed by appropriately combining one or a plurality of arcs, straight lines and the like passing through the horizontal blade portion curve start portion F. Further, the horizontal blade side curve line U2 is provided so as to pass through the intersection of the vertical blade side curve line U1 and the horizontal blade portion curve start portion F and to be orthogonal to the horizontal blade portion curve start portion F.

  Specifically, as shown in FIG. 1 and FIG. 3, the vertical blade side curve line U1 is centered on a point located slightly above the back portion 2b and directed downward or on the base 1 side on the blade edge 2a side. An arc portion formed by an arc that is convex obliquely downward and a straight line portion that is a tangent to the arc portion are configured. The straight line portion is provided to be orthogonal to the horizontal blade portion curve start portion F and to be a tangent to the arc portion of the vertical blade side curve line U1. In such a case, the side-blade curve line U2 is an extension of the tangent line.

  That is, in the vertical blade portion 2 of the tilling nail, the vertical blade side curve line U1 curves in the right direction in the front view from the blade edge 2a side to the back portion 2b side. It is curved in the right direction in the front view from the blade edge 2a side to the back portion 2b side by the side curve line U2, and is curved in the right direction in the front view by the side blade portion curve starting portion F.

  In this way, in the vertical blade portion 2 and the horizontal blade portion 3, by forming a back side curved region that curves in one direction side in the same direction as the horizontal blade portion 3 from the blade edge 2a side to the back portion 2b side. As shown in FIG. 2, the soil cut by the blade edge 2a when the vertical blade portion 2 was struck at the time of tilling at the attachment position W1 and the tilling depth W2 of the tillage nail with respect to the soil similar to the conventional product. Can be moved in the right direction of the front view (front side of the side view) in the back-side curved region.

  And since the horizontal blade part 3 is driven later, the soil crushed and cultivated (moved) by the vertical blade part 2 can be reversed in advance, so that the reversibility is higher than that of the conventional product. Can be improved. As a result, overall load fluctuations during tillage can be alleviated, and various tillage performances such as reversibility, squeezeability, and crushed soil can be improved.

  Further, in the same manner as in the conventional product, when the side blade portion 3 having the first elevation angle α and the second elevation angle β substantially equal to each other is configured, the tip portion of the side blade portion 3 is worn. However, it is a matter of course that the decrease in reversibility, squeezing property, and soil breaking property can be minimized.

  As described above, according to the tilling nail according to the present invention described above, since the vertical blade portion 2, the back-side curved region, and the horizontal blade portion 3 act on the soil in order when driven, the horizontal blade portion. Before the 3 acts on the soil, the soil can be cultivated in the back-side curved region, and the horizontal blade portion 3 can be cultivated smoothly. As a result, overall load fluctuations during tillage can be alleviated, horsepower load and vibration can be reduced, and various tillage performances such as reversibility, squeezeability, and soil breaking properties can be improved. .

  Further, even when soil with strong viscosity is cultivated, it is possible to cultivate the soil without embracing the soil by the back side curved region, so that the release property can be improved. In other words, it is more excellent in reversibility, squeezeability, and crushed soil than conventional tillage claws, and it alleviates overall load fluctuations, especially during tillage, and can be used in any soil. Can be maintained.

  The present invention is not limited to the configuration of the above-described embodiment, and can be implemented by appropriately changing the shape, dimensions, material, and the like. In addition, as for the back portion side curve region, it is needless to say that the vertical blade side curve line U1 and the horizontal blade side curve line U2 constituting the back portion side curve start portion U can be appropriately shaped.

  For example, as shown in FIG. 4 (a), in the back portion side curved region, the vertical blade side curve line U1 is the boundary portion between the base 1 and the vertical blade portion 2 on the horizontal blade portion 3 side, and the horizontal blade portion curve starts. It can also be formed only from an arcuate portion that protrudes obliquely downward so as to connect the intersection of the portion F and the upper end of the blade portion. In this case, the horizontal blade side curve line U2 passes through the intersection of the arc portion that becomes the vertical blade side curve line U1 and the horizontal blade portion curve start portion F, becomes a tangent to the arc portion, and the horizontal blade portion curve. It is provided so as to be orthogonal to the start part F. Thereby, most area | regions of the vertical blade part 2 at the time of driving | operation can be made into a back | dorsal part side curvature area | region, and it is more effective in tillage performance.

  Further, for example, as shown in FIG. 4B, in the back portion side curved region, the vertical blade side curved line U1 is centered on a point located slightly above the back portion 2b and protrudes downward on the blade edge 2a side. It is also possible to form a circular arc portion formed from a circular arc and a plurality of linear portions that are continuous from the end of the circular arc portion and bend upward. In this case, the horizontal blade side curve line U2 passes through the intersection of the arc portion of the vertical blade side curve line U1 and the horizontal blade portion curve start portion F, becomes a tangent to the arc portion, and starts the horizontal blade portion curve start. It is provided so as to be orthogonal to the part F.

  Of course, a part of the configuration can be omitted, and a part of the configuration can be extracted.

DESCRIPTION OF SYMBOLS 1 Base part 2 Vertical blade part 2a Blade edge 2b Back part 3 Horizontal blade part A Plowing escape length B Total horizontal length C Total vertical length D Blade width E Blade vertical length F Horizontal blade curve start part H1 Total curve height K Blade edge intersection L Curving start horizontal distance M Middle point M1 Back intersection N Use limit point O Edge edge start point P Maximum edge position Q Horizontal edge edge position in the horizontal direction R Edge distance Rm Maximum edge distance S Rotating claw axis SO Rotation Axis line U Back side curve start portion U1 Vertical blade side curve line U2 Horizontal blade side curve line α First elevation angle β Second elevation angle

Claims (4)

A base (1) attached to the rotating claw shaft (S);
A vertical blade portion (2) from the base portion (1) to a horizontal blade portion curve start portion (F) extending vertically downward;
While curving in the direction opposite to the rotation direction from the vertical blade portion (2), it is curved in one direction with respect to the base portion (1), and extends continuously from the horizontal blade portion curve start portion (F) as a boundary. A horizontal blade portion (3) made of a curved plate,
The tilling claw characterized in that the vertical blade portion (2) and the horizontal blade portion (3) are provided with a back side curved region that curves from the blade edge side to the back side toward the one direction side. The back portion side curve region is configured by a vertical blade side curve line and a horizontal blade side curve line, and the vertical blade portion is formed by an upper end of the blade portion or a vertical blade side curve line located on the back side from the blade portion. The tilling nail according to claim 1 which divides the back side curved field. The tilling claw according to claim 2 in which said horizontal blade side curve line is orthogonal to said horizontal blade part curve start part (F). The said vertical blade part curve line has an arc part at least, The said horizontal blade side curve line is a tangent of the said arc part, and orthogonal to the said horizontal blade part curve start part (F). The tilling nail according to 2.

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