JP2009106205A - Apparatus for preventing weed and straw from winding in rotary tilling apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for preventing weeds and straws from winding, which effectively prevents weeds (long straws, weeds, or the like) from winding on the tilling cylinder of a rotary tilling apparatus. <P>SOLUTION: Weeds and straws G (long straws, weeds, or the like) that are wound on the tilling cylinder 15 during a tilling operation in a field are raised from the tilling cylinder 15, while being contacted with the recessed circular blade surface 31a of a weed and straw cutting blade 31 by the centrifugal force, by arranging the weed and straw cutting blade 31 that has a recessed circular blade surface 31a that faces in the reverse rotation direction of the tilling cylinder 15 (back side relative to the rotation direction of the tilling cylinder 15) on the outer periphery of the tilling cylinder 15 of the rotary tilling apparatus 2. At that time, the weeds and straws G are cut and fractionated, while being struck strongly against the circular blade surface 31a of the weed and straw cutting blade 31, and the fractionated weeds and straws G are thrown away together with the tilled soil. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotary tiller that is mounted on a rear part of a farm vehicle such as a tractor so as to be movable up and down via a link device, and more particularly to a grass wrapping prevention device provided on a tiller cylinder equipped with a plurality of tillage claws. .

  2. Description of the Related Art Conventionally, a three-point link type work machine mounting device is disposed at the rear of a farm vehicle such as a tractor, and a work machine such as a rotary tiller can be mounted on the rear of the work machine mounting device so as to be movable up and down. It is like that. Further, the tiller cylinder of the rotary tiller equipped with a plurality of tillage claws is driven to rotate by a drive chain wound around a drive sprocket and a driven sprocket in a transmission case provided on one side of the rotary tiller. Thus, the farming field is cultivated by the cultivating claws by rotating the cultivating cylinder while the farming vehicle is running.

  Then, in order to prevent grass (long pods, weeds, etc.) from being wound around the tillage cylinder by the rotation drive of the tillage cylinder, a certain distance from the outer periphery of the tillage cylinder is present at a predetermined interval. 2. Description of the Related Art A known rod is stretched and supported between tillage claw holders on the left and right outermost ends of the tillage cylinder (see, for example, Patent Document 1).

In addition, in order to cut the grass wrapped around the tilling nail by the crushed soil pressure at the time of tilling, a saw blade-like cutting blade is provided in the rotation direction of the inwardly curved surface of the tilling nail, that is, the tilling shaft (axle) Those are known (for example, see Patent Document 2).
JP-A-10-150801 (page 3, FIG. 1) Japanese Utility Model Publication No. 60-89804 (FIGS. 1 to 3)

  However, the above-mentioned conventional Patent Document 1 captures grass that is to be wound around a tilling cylinder by a rod stretched substantially parallel to the tilling cylinder at a predetermined interval from the outer periphery of the tilling cylinder. Although it was intended to be released, the expected effect was not sufficiently obtained, and especially the grass once wound around the tillage tube had to be excised using a sickle or the like. Moreover, since the thing of patent document 2 has provided the cutting blade in the rotation direction of the tilling axis | shaft, this cutting blade was worn and damaged by the collision with the stone in the soil, and was not practical.

  The present invention is intended to solve the above-described problem, and is a rotary tiller device including a tiller cylinder equipped with a plurality of tillage claws and a rotary cover that covers the top of the tillage claws, A grass cutting blade having a blade surface on the back side with respect to the rotation direction of the tilling cylinder is provided on the outer periphery of the tilling cylinder.

  According to the present invention, as a grass wrapping prevention device in a rotary cultivator, a grass cutter cutting having a blade surface on the back side with respect to the rotation direction of the cultivating tube on the outer periphery of the cultivating tube equipped with a plurality of cultivating claws. By providing a blade, if grass (long blades, weeds, etc.) is wound around the tillage cylinder during the cultivation work in the field, this grass will hit the blade surface of the grass cutting blade by centrifugal force. Ascends from the outer periphery of the tillage tube. At that time, the grass is cut into pieces while being strongly abutted against the blade surface of the grass cutting blade, and the fragmented grass is released together with the cultivated soil. It becomes possible to prevent winding. The blade surface of the grass cutting blade is directed in the anti-rotation direction of the tillage cylinder, and wear and damage due to collision with the stone that is flipped up by the tilling claws during the tilling work in the field are unlikely to occur.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a state in which a rotary tiller 2 is attached to the rear part of a tractor 1 that is a farm vehicle, and FIG. 2 is a plan sectional view of the rotary tiller 2. The rotary tiller 2 is mounted on the tractor 1 via the three-point link mechanism 3 and the auto hitch 4 so as to be movable up and down.

  A gear case 5 is provided at the center of the rotary tiller 2. A pair of left and right top masts 6, 6 are fixed to the upper part of the gear case 5, and the front upper parts of the top masts 6, 6 are connected to an auto hitch. 4 is connected. Further, a screw type adjusting device 8 for adjusting the vertical posture of the tool bar 7 on which a tail wheel, a vertical stand or the like is usually mounted is pivotally supported on the upper rear side of the top masts 6 and 6.

  In addition, on the left and right sides of the gear case 5, a left cylindrical arm 10 that also serves as a horizontal transmission cylinder of the rotary tiller 2 and a right cylindrical arm 11 having substantially the same dimensions as the left cylindrical arm 10 are disposed. A chain case 12 that is a transmission case of the rotary tiller 2 is fixed to the outer end (left end side) of the cylindrical arm 10, and a side plate 13 is fixed to the outer end (right end side) of the right cylindrical arm 11. . Then, the rotary tiller 2 is integrally mounted by pivotally supporting a tiller cylinder 15 equipped with a plurality of tillage claws 14 on ball bearings 16, 17, 18 disposed below the chain case 12 and the side plate 13. Assembled. The tilling claws 14 are mounted (screwed) via a holder 15 a fixed to the tilling cylinder 15.

  In addition, a rotary cover 19 that covers the top of the tilling claw 14 is formed in an arc shape in a side view, and side covers 20 and 20 are provided on both the left and right sides. Then, the rear cover 21 is pivotally supported with the pivot point P at the rear portion of the rotary cover 19 as a pivot center, and the rear cover 21 can be lifted via a pair of left and right suspension rods 22, 22. The space S between the rotation locus of the claw 14 and the rear cover 21 can be adjusted to a desired gap.

  The driving force transmitted from the input shaft 24 connected to the rear PTO shaft of the tractor 1 via the universal joint is applied to the driving shaft 27 provided in the left cylindrical arm 10 via the bevel gears 25 and 26 in the gear case 5. Further, the drive sprocket 28 is attached to the drive shaft 27 at the upper part of the chain case 12 and the drive chain 30 is wound around the driven sprocket 29 connected to the tillage cylinder (driven shaft) 15 at the lower part of the chain case 12. The tiller cylinder 15 is rotationally driven, and a so-called side drive type transmission mechanism is employed.

  The rotary tiller 2 of the present invention is shown in FIGS. 3 and 4 as an apparatus for preventing the winding of a weed (long bales, weeds, etc.) wound around a rotating cylinder 15 that is driven to rotate. A grass cutting blade 31 is provided. This grass cutting blade 31 is substantially formed on the outer periphery of the tilling cylinder 15 at a predetermined interval as shown by a two-dot chain line B in FIG. 3 while sewing between the plurality of tilling claws 14 mounted on the tilling cylinder 15. It is provided in a spiral shape.

  More specifically, the grass cutting blade 31 has a concave arcuate blade surface 31a facing in the counter-rotating direction on the back side with respect to the arrow A direction in FIG. When the grass cage G is wound around the tillage cylinder 15 during the tilling work in the field, this grass cage G abuts against the concave arcuate blade surface 31a of the grass blade cutting blade 31 by centrifugal force. However, it floats from the outer peripheral surface F of the tilling cylinder 15 in the direction of arrow D in the figure. At that time, the grass G is cut into pieces while being strongly abutted against the arc blade surface 31a of the grass cutting blade 31, and the cut grass G is released along with the cultivation soil. It becomes possible to prevent the wrapping of the grass G to 15.

  The grass cutting blade 31 described above forms a convex arc 31b having a receding angle with respect to the direction of the arrow A in FIG. The grass rod G to be wound around the cylinder 15 can be lifted up, and is supported by being stretched and supported substantially parallel to the tillage cylinder at a predetermined interval from the outer periphery of the cultivation cylinder in Patent Document 1. As with the rod, it has the effect of letting the grass G once lifted together with the cultivated soil. Further, the arcuate blade surface 31a of the grass cutting blade 31 faces in the counter-rotating direction of the tillage cylinder 15, and wear and damage due to a collision with a stone that is flipped up by the tilling claws 14 during the tilling work in the field are unlikely to occur. .

The side view which shows the cultivation work state by a rotary tillage apparatus. The plane sectional view which omitted a part of rotary tillage device. The principal part perspective view of a tilling cylinder. The principal part side view which shows the action | operation state of a grass cutting blade (grass winding prevention means).

Explanation of symbols

2 Rotary tillage device 14 Tillage claw 15 Tillage cylinder 19 Rotary cover 31 Grass cutting blade 31a Blade surface

Claims (1)

  A rotary tiller (2) provided with a tillage cylinder (15) equipped with a plurality of tillage claws (14) and a rotary cover (19) covering the top of the tillage claws (14), the tiller cylinder (15) ) With a grass cutting blade (31) having a blade surface (31a) on the back side with respect to the rotation direction of the tillage cylinder (15) on the outer periphery of the rotary tilling device Prevention device.

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