JP2015133922A - Tilling claw and agricultural machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide tilling claws in which the tilling resistance can be reduced while improving harrowing performance.SOLUTION: An agricultural machine 1 includes a machine body 2 connected to the rearward of a tractor, a tilling body 6 for tilling work, and a leveling body 17 for leveling work. The tilling body 6 has a rotary shaft body 11, and two or more tilling claws 15 attached to this rotary shaft body 11. Each tilling claw 15 includes a planar base end side plate part 31, a curved middle plate part 32 continuously arranged to this base end side plate part 31, and a planar tip side plate part 33 continuously arranged to this middle plate part 32. The middle plate part 32 has a curvature radius that is gradually increased from the front end side in the rotation direction toward the rear end side in the rotation direction.

Description

  The present invention relates to a tilling claw and an agricultural machine that are attached to a rotating shaft.

  Conventionally, for example, a tilling nail described in Patent Document 1 is known.

  This conventional tillage claw has a mounting base, a vertical blade, and a horizontal blade, and is curved in the direction opposite to the rotation direction from the vertical blade to the horizontal blade, and the horizontal blade is on one side. Is curved towards. In addition, the bending start part of the horizontal blade part is slightly closer to the tip side or half than the half of the horizontal claw length direction from the vertical line passing through the mounting base, and the edge of the vertical blade part is the edge of the horizontal blade part. It is made longer than the part, or almost the same length. Furthermore, the curve to the one side of the horizontal blade portion is curved with a constant radius of curvature.

JP 9-298903 A

  However, since the conventional tillage nail is bent with a certain radius of curvature, only one of the two performances can be exerted from the viewpoint of soil breaking performance and tillage resistance.

  This invention is made | formed in view of such a point, and it aims at providing the tilling nail | claw and agricultural implement which can aim at reduction of tillage resistance, improving the crushing performance.

  The tilling claw according to claim 1 is a tilling claw that is attached to the rotating shaft body and rotates together with the rotating shaft body, and includes a flat base end side plate portion that is attached to the rotating shaft body, and the base end side plate portion. A curved intermediate plate portion connected to the intermediate plate portion, and a flat front end side plate portion connected to the intermediate plate portion, the intermediate plate portion having a radius of curvature from the front end in the rotation direction to the rear in the rotation direction. It is formed in a shape that gradually increases toward the end side.

  The tilling nail according to claim 2 is the tilling nail according to claim 1, wherein a blade edge portion is formed at least at the front end portion in the rotation direction of the tip side plate portion.

  The tilling nail according to claim 3 is the tilling nail according to claim 1 or 2, wherein the overall shape is a letter shape in plan view.

  According to a fourth aspect of the present invention, there is provided an agricultural machine including a rotating shaft body and a plurality of tilling claws according to any one of the first to third aspects attached to the rotating shaft body.

  According to the present invention, it is possible to reduce the tillage resistance while improving the crushed soil performance.

It is a side view of the agricultural working machine provided with the tilling nail concerning the 1st embodiment of the present invention. It is a perspective view of a tilling nail | claw same as the above. It is a front view of a tilling nail same as the above. It is a top view of a tilling nail same as the above. It is a bottom view of a tilling nail same as the above. It is a perspective view of the tilling nail | claw concerning the 2nd Embodiment of this invention. It is a front view of a tilling nail same as the above. It is a top view of a tilling nail same as the above. It is a bottom view of a tilling nail same as the above. It is a perspective view of the cultivation nail | claw concerning the 3rd Embodiment of this invention. It is a front view of a tilling nail same as the above. It is a top view of a tilling nail same as the above. It is a bottom view of a tilling nail same as the above.

  A first embodiment of the present invention will be described with reference to FIGS.

  In the figure, reference numeral 1 denotes an agricultural machine. The agricultural machine 1 is connected to a rear portion of a tractor (not shown), which is a traveling vehicle, for example, and moves forward in an agricultural field such as a paddy field by the forward traveling of the tractor While doing farming work, such as tillage work.

  As shown in FIG. 1, the farm work machine 1 includes a machine body 2 that is detachably connected to a three-point link part (work machine lifting device) at the rear of the tractor.

  The airframe 2 has a mission case portion 3 at the center in the left-right direction. The mission case portion 3 is rotatably provided with an input shaft 4 for inputting power from the tractor side. The input shaft 4 is connected to the PTO shaft of the tractor via a joint.

  The machine body 2 has a chain case part 5 and bracket parts (not shown) on both the left and right sides, and between these chain case part 5 and the bracket part, tilling while rotating in a predetermined direction by power from the input shaft 4 side. A rotary type tiller 6 for working is rotatably provided.

  The tillage body 6 has a rotation shaft body 11 which is a left and right longitudinal tillage shaft rotating about a rotation center axis line X in the left and right direction, and the rotation shaft body 11 has a left end portion attached to the chain case portion 5. And a right end portion thereof is rotatably supported by a bracket portion (not shown). The rotary shaft body 11 includes, for example, a round shaft-shaped rotary shaft portion 12 and a plurality of flange-shaped flange portions (attached portions) 13 that protrude from the outer peripheral side of the rotary shaft portion 12 in the axial direction. It consists of and.

  A plurality of tilling claws 15 that perform a tilling operation while rotating in a predetermined direction (rotating direction indicated by an arrow) together with the rotating shaft 11 are detachably attached to each flange portion 13 of the rotating shaft 11. The tillage body 6 includes a rotating shaft body 11 and a tilling claw 15.

  Further, the farm work machine 1 includes a curved plate-like cover body 16 that covers an upper portion of the tillage body 6. At the rear end of the cover body 16, a leveling body 17 that performs leveling work behind the tillage body 6 is provided so as to be rotatable in the vertical direction.

  The leveling body 17 has a flat plate 19 having an upper end portion rotatably connected to a rear end portion of the cover body 16 via a hinge 18. A foldable extended flat plate 20 is attached to both ends of the flat plate 19 in the left-right direction.

  Further, the farm work machine 1 includes a gauge ring 21 positioned in front of the tillage body 6. The gauge wheel 21 is attached to a gauge wheel holder 23 attached to the front frame portion 22 of the airframe 2 so that the height position can be adjusted.

  Here, the tilling claw 15 is integrally formed in a curved plate shape having a constant width by, for example, a metal material, and the entire shape thereof is a square shape (including a substantially square shape) in plan view (see FIG. 4). ).

  As shown in FIGS. 2 to 5, the tilling claw 15 is detachably attached to the flange portion 13 of the rotary shaft body 11 with a fixture (not shown). A flat base end side plate portion (longitudinal blade portion) 31 positioned along a plane orthogonal to the axis X (virtual orthogonal plane), and a tip end of the base end side plate portion 31 lateral to the rotation direction. A curved intermediate plate 32 that is curved and has a trapezoidal shape (including a substantially trapezoidal shape) as viewed from the front, and is integrally connected to the tip of the intermediate plate 32 so as to protrude. And a flat distal end side plate portion (horizontal blade portion) 33 positioned along a plane (virtual inclined surface) inclined with respect to the rotation center axis X of the rotary shaft body 11. Note that attachments for attaching the tilling claws 15 to the flange portion 13 are, for example, bolts and nuts.

  Moreover, the angle θ formed by the plane a along the base end side plate portion 31 and the plane b along the distal end side plate portion 33 is, for example, 50 to 70 °, preferably 60 ° (see FIG. 4). The proximal end side plate portion 31 may be positioned substantially along the plane a, and the distal end side plate portion 33 may be positioned approximately along the plane b.

  And the base end side board part 31 is formed in the shape which makes | forms square shape, for example by front view. A plurality of, for example, two circular mounting holes 34 are formed in the base end portion of the base end side plate portion 31 so as to penetrate the inner and outer surfaces. The base end portion of the base end side plate portion 31 is an attachment portion 35 that is attached to the flange portion 13 of the rotating shaft body 11.

  The intermediate plate portion 32 has, for example, a concave curved surface shape inward, and its radius of curvature gradually increases from the rotation direction front end side (blade edge side) toward the rotation direction rear end side (peak side). It is formed into a shape. The intermediate plate portion 32 is a portion of the tilling claw 15 that is located between the bending start straight line S and the bending end straight line E.

  The minimum curvature radius Rmin, which is the curvature radius of the front end edge (edge on the blade edge side) 32a in the rotation direction of the intermediate plate portion 32, is, for example, 60 to 90 mm, preferably 80 mm. The maximum curvature radius Rmax, which is the curvature radius of the rear end edge (peak edge) 32b in the rotation direction of the intermediate plate portion 32, is, for example, 120 to 150 mm, preferably 130 mm. For example, Rmax is 1.2 to 2.0 times (preferably 1.6 times) Rmin.

  Further, in plan view, the outer surface of the arc-shaped rotational direction front end edge 32a of the intermediate plate part 32 is located outward from the outer surface of the arc-shaped rotational direction rear end edge 32b of the intermediate plate part 32 (see FIG. 4).

  The distal end side plate portion 33 is formed in, for example, a quadrangular shape when viewed from the front. At the front end portion in the rotation direction of the distal end side plate portion 33, a tapered blade edge portion 36 whose thickness dimension gradually decreases in the rotation direction is formed.

  The blade edge portion 36 is formed from the proximal end side to the distal end side at the front end portion in the rotational direction of the distal end side plate portion 33. The blade edge portion 36 is formed, for example, by cutting out a part on the inner surface side of the front end portion in the rotation direction of the front end side plate portion 33. The blade edge portion 36 is formed only at the front end portion in the rotational direction of the distal end side plate portion 33 and is not formed in the intermediate plate portion 32 and the proximal end side plate portion 31.

  Next, the operation and the like of the farm work machine 1 will be described.

  When the farm work machine 1 is connected to the rear part of the tractor and the farm work machine 1 is moved forward by the forward travel of the tractor, each tilling claw 15 of the tillage body 6 rotates together with the rotary shaft body 11 in a predetermined rotation direction. Then, the tilling work is performed, and the ground leveling body 17 performs the leveling work behind it to level the field scene flatly.

  At this time, on the front end side in the rotation direction of the intermediate plate portion 32 of the tilling claw 15, the radius of curvature is small, so that the soil breaking performance improves. Further, since the radius of curvature is large on the rear end side in the rotation direction of the intermediate plate portion 32 of the tillage claw 15, tillage resistance is reduced.

  Therefore, according to such an agricultural machine 1, the tillage resistance can be reduced while improving the crushed soil performance.

  In the above-described embodiment, the blade edge portion 36 that is the blade portion is cut out at a part of the inner surface side (the inner side where the center of the radius of curvature exists) of the front end portion in the rotation direction of the distal end side plate portion 33. Although the configuration formed by the above-described configuration has been described, for example, as in the second embodiment shown in FIGS. 6 to 9, the blade edge portion 36 is formed on the outer surface side of the front end portion in the rotation direction of the tip side plate portion 33 (the radius of curvature). A configuration in which a part of the outer side (the side where the center does not exist) is cut out may be used.

  Further, in the above-described embodiment, the configuration in which the blade edge portion 36 that is the blade portion is formed only at the front end portion in the rotation direction of the front end side plate portion 33 is described, but at least formed at the front end portion in the rotation direction of the front end side plate portion 33. For example, as in the third embodiment shown in FIGS. 10 to 13, the blade edge portion 36 is disposed at the front end portion in the rotational direction of the front end side plate portion 33 and the front end portion in the rotational direction of the intermediate plate portion 32. The formed structure may be sufficient.

  In other words, in the third embodiment, the blade edge portion 36 has a front end portion in the rotational direction of the front side plate portion 33 from a proximal end side (for example, a position near the bending start straight line S) at the front end portion in the rotational direction of the intermediate plate portion 32. It is formed over the front end side. Further, the blade edge portion 36 is formed by cutting out a part of the inner surface side (inner side) of the front end portion in the rotation direction, but may be formed by cutting out a part of the outer surface side (outer side). .

  For example, although not shown, the blade edge portion 36 may be formed on the distal end side plate portion 33, the intermediate plate portion 32, and the proximal end side plate portion 31.

1 Farming machine
11 Rotating shaft
15 tillage nail
31 Base side plate
32 Intermediate plate
33 Tip side plate
36 Blade edge

Claims (4)

A tilling claw attached to the rotating shaft and rotating together with the rotating shaft,
A flat base end side plate attached to the rotating shaft;
A curved intermediate plate connected to the base side plate,
A flat tip side plate portion connected to the intermediate plate portion,
The tiller claw characterized in that the intermediate plate portion has a shape in which the radius of curvature gradually increases from the front end side in the rotational direction toward the rear end side in the rotational direction. The tilling nail according to claim 1, wherein a blade edge portion is formed at least at a front end portion in the rotation direction of the front end side plate portion. The tilling nail according to claim 1 or 2, wherein the overall shape is a square shape in plan view. A rotating shaft body;
A farm working machine comprising: the plurality of tilling claws according to claim 1 attached to the rotating shaft body.

Images