JP3658447B2 - Middle plow weeder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a middle tillage weeder mainly used in orchards and the like.
[0002]
[Prior art]
Since the branches of fruit trees often hang down, it is necessary to use a medium height weeding machine used in such land. For this reason, Japanese Patent Application Laid-Open No. 5-030803 discloses a full floating floating tiller with a four-wheel caster in which a rotary tiller is attached to a low flat frame. ing.
[0003]
By the way, since the middle-plowed grassland has irregularities on the ground, it is preferable that the middle-plowed weeder can absorb this and follow the irregularities on the ground. For this reason, the previous example can also absorb the back-and-forth motion and the left-right motion with the hitch arm. Specifically, a connecting arm rod that is rotatable in the left-right direction is attached to the flat frame, and the hitch arm and the connecting arm rod are connected so as to be rotatable in the front-rear direction.
[0004]
[Problems to be solved by the invention]
However, the connecting brace in this case is merely an L-shaped link, and is merely pivotally attached to one front portion of the flat frame. Therefore, when it is turned left and right while largely undulating in the front-rear direction, there is a concern that the connecting arm rod may be twisted and cannot be turned right and left. Further, when the hitch arm is raised and the rotary tiller is lifted, a large offset load is applied to the connecting arm, causing the pivoting portion to bend. The present invention solves such a problem, and prevents such a knot from occurring in the connecting armband.
[0005]
[Means for Solving the Problems]
Under the above-mentioned problems, the present invention is a flat frame that is connected by a hitch arm supported by the three-point link mechanism of the tractor and is arranged on the side of the tractor, and the rotary tiller part is moved up and down in the front-rear direction. In a middle cultivating weeder suspended in a movable manner, a gate-shaped arm that fits in the lower projection surface of the flat frame is attached to the upper surface of the flat frame so that it can be pivoted in the left and right directions with two pivot shafts. An intermediate plowing weeder is provided, wherein a hitch body that receives the hitch arm so as to be pivotable in the front-rear direction in the middle of the gate-shaped arm is also housed in the lower projection surface of the flat frame .
[0006]
Further, the present invention is Te or more means odor, pivotally attached to the fulcrum shaft provided with a front portion of Russia Tari tilling unit in flat frame, the upper portion of the rotary tilling unit with pivotally mounted hydraulic cylinder flat frame A middle tillage weeder characterized by being suspended, and a middle tillage weeder characterized by allowing a rotary tiller part to be suspended by a hydraulic cylinder while allowing a slight forward rotation of the rotary tiller part.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a side view of a middle tillage weeder showing an example of the present invention, FIG. 2 is a front view, FIG. 3 is a plan view, and FIG. 4 is a central longitudinal sectional view. The middle tillage weeder according to the present invention includes a flat frame 10 having a short height and a rotary tiller 12 that is suspended from the flat frame 10 so as to be movable up and down in the front-rear direction. The flat frame 10 is supported by casters 14 each having two front and rear wheels, and a gate-shaped arm 18 that is pivotable in the left and right directions is attached to the upper surface of the flat frame 10 by two pivot shafts 16.
[0008]
The flat frame 10 has a square shape in plan view, and two casters 14 are attached concentrically in the front-rear direction to the front-rear part thereof at regular intervals on the left and right. In this case, the caster 14 is attached by a bracket 22 being rotatably inserted into a holding cylinder 20 provided vertically on the front frame and the rear frame, and the caster 14 is fixed to the bracket 22.
[0009]
The rotary tiller 12 is attached to the flat frame 10 as follows. That is, the rod 26 is passed in the left-right direction between the outer frame and the inner frame of the flat frame 10, and the left and right brackets 28 are rearwardly spaced apart from the rod 26. The fulcrum shaft 32 is inserted in the left-right direction between the mounting plate 30 provided at the front portion of the portion 12.
[0010]
On the other hand, the head side of the hydraulic cylinder 34 is pivotally attached to the front frame of the flat frame 10, the rod is extended backward, and the tip thereof and the attachment portion 36 provided on the top of the rotary tiller 12 are pivotally attached through the pin 38. Thereby, when the hydraulic cylinder 34 is expanded and contracted, the rotary tiller 12 moves up and down in the front-rear direction around the fulcrum shaft 32. In this case, a bolt 40 is attached downward to the bracket 28, and a stopper 42 that contacts the head of the bolt 40 is provided on the attachment plate 30.
[0011]
Thus, when the rotary tiller 12 is lowered and the stopper 42 hits the bolt 40, further descent is restricted. Therefore, the length of the bolt 40 is adjusted to set the lowered position of the rotary tiller 12. A hole formed in the attachment portion 36 of the rotary tiller 12 through which the rod pin 38 of the hydraulic cylinder 34 is inserted is a long hole 44 at the front and rear. Thereby, when the rotary tiller 12 is flipped up by an obstacle or the like, only the long hole 44 can be rotated forward to absorb the impact.
[0012]
The rotary tiller 12 includes a tilling shaft 46 extending in the left-right direction, a tilling claw 48 attached around the tilling shaft 46, a rotary cover 50 covering the top of the tilling claw 48, and both side surfaces of the rotary cover 50. The side cover 52 and the like are covered. The tilling shaft 46 is driven by a hydraulic motor 54 so that the tilling claw 48 rotates in the upcut direction. A rubber film 51 is also provided on the inner periphery of the rotary cover 50 to prevent adhesion of mud or the like.
[0013]
In order to drive the tilling shaft 46, the chain case 56 is obliquely installed rearward and downward along the left and right sides (tractor side) of the side cover 52, and the hydraulic motor 54 is sewn with a flange on the upper part of the chain case 56. The output shaft of the hydraulic motor 54 and the tilling shaft 46 are connected by a chain / sprocket mechanism. In addition, before and after the rotary cover 50, flexible covers 58 and 60 made of rubber or the like whose lower ends are substantially grounded are suspended.
[0014]
On the upper surface of the flat frame 10, a portal arm 18 is attached that is pivotable in the left and right directions by two pivotal support shafts 16 provided in the same center on the front and rear frames. Is mounted with a hitch body 64 which receives a hitch arm 62 supported and extended by a three-point link mechanism of the tractor so as to be rotatable in the front-rear direction. The hitch body 64 has a cover portion 66 that can be opened and closed by operating the lever 68, and the hitch arm 64 and the cover portion 66 sandwich the cylindrical portion of the hitch arm 62.
[0015]
In this case, the hitch member 64, because that as close as possible to the tractor side are housed beneath the projection plane of the flat shape frame 10. With the above configuration, the movement of the airframe moving back and forth can be absorbed by the hitch body 64 that receives the hitch arm 62, and the movement of the left and right movement can be absorbed by the pivot shaft 16 of the portal arm 18.
[0016]
The above middle tillage weeder is disposed on the side of the tractor T and pulled. In other words, at the time of work, the hitch arm 62 is lowered until the caster 14 is grounded. At this time, if the tilling shaft 46 is driven by the hydraulic motor 54 and the rotary tiller 12 is lowered by the hydraulic cylinder 34 to a predetermined position. Thus, the middle tillage weeding work with the tilling claws 48 can be performed.
[0017]
5 and 6 are a side view and a front view showing a state in which the middle tillage weeder is lifted when turning or moving to another place. The left and right positions of the eighteen pivot shafts 16 are moved closer to the tractor T side than the left and right center of gravity, and the flat frame 10 is lifted forward when the middle tiller is lifted. Further, the front / rear position of the hitch body 64 is also moved rearward from the front / rear center of gravity position so that the flat frame 10 is in an outwardly lowered state when the middle tillage weeder is raised.
[0018]
【The invention's effect】
As described above, since the present invention is as described above, that is, a gate-shaped arm that is pivotable in the left-right direction is attached to a flat frame with two pivot shafts at the front and rear, and the hitch arm is located in the middle of the portal-shaped arm. Since the hitch body that pivotably receives in the front-rear direction is attached, the load applied to the portal arm will be handled in a jagged manner in the middle hitch body and the two front and rear pivot points. The hook is balanced and does not cause the gate arm to bend. Therefore, the flat frame smoothly moves back and forth and absorbs the unevenness of the terrain.
[0019]
Further, since the portal arm is accommodated in the lower projection plane of the flat frame, the middle tillage weeder can be connected close to the tractor, and the torsional moment applied to the hitch arm and the like can be reduced. In addition, the front of the rotary tiller is pivotably attached to a fulcrum shaft provided on the flat frame, and the upper part of the rotary tiller is suspended by a hydraulic cylinder pivotally attached to the flat frame, thereby making the rotary tiller more efficient. In this case, when the rotary tillage part is lifted up by an obstacle or the like by allowing the rotary tillage part to be slightly forward rotated and suspending the rotary tillage part with a hydraulic cylinder, Can absorb shocks.
[Brief description of the drawings]
FIG. 1 is a side view of a middle tillage weeder showing an example of the present invention.
FIG. 2 is a front view of a middle tillage weeder showing an example of the present invention.
FIG. 3 is a plan view of a middle tillage weeder showing an example of the present invention.
FIG. 4 is a central longitudinal sectional view of a middle tillage weeder showing an example of the present invention.
FIG. 5 is a side view when the middle tillage weeder according to the present invention is raised.
FIG. 6 is a front view of the middle tillage weeder according to the embodiment of the present invention when it is raised.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Flat frame 12 Rotary tilling part 14 Caster 16 Pivot shaft 18 Portal arm 32 Support shaft 34 Hydraulic cylinder 62 Hitch arm 64 Hitch body

Claims (3)

In a middle tillage weeder that is connected by a hitch arm supported by the tractor's three-point link mechanism and is arranged on the side of the tractor and suspends the rotary tiller part vertically movable in a flat frame supported by casters ,
A portal arm that fits in the lower projection plane of the flat frame is attached to the upper surface of the flat frame so that it can be pivoted in the left and right directions using two pivots, and a hitch arm is installed in the middle of the portal arm. A middle weeding weeder characterized in that a hitch body that is pivotably received in the front-rear direction is mounted in the lower projection surface of the flat frame .   The front part of the rotary tillage part is rotatably attached to a fulcrum shaft provided on the flat frame, and the upper part of the rotary tillage part is suspended by a hydraulic cylinder pivotally attached to the flat frame. Medium plowing weeder.   The middle tillage weeder according to claim 2, wherein the rotary tiller is suspended by a hydraulic cylinder while allowing a slight forward rotation of the rotary tiller.

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