JP3658448B2 - 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, in Japanese Patent Application Laid-Open Nos. 5-030802 and 030803, a full floating floating medium weeder using a four-wheel caster with a rotary tiller attached to a low flat frame is disposed behind the tractor and pulled. Things are shown.
[0003]
This medium-tillage weeder is pulled by a hitch arm supported by a three-point link mechanism of the tractor, but is pulled up from the ground when turning or moving. And when the work is started, it is lowered to the ground again, but since it is a full floating system in which all the four-wheel casters are grounded, there is some impact when it is lowered to the ground.
[0004]
[Problems to be solved by the invention]
Therefore, it is preferable to take some shock mitigation measures, but no specific measures are seen in the previous examples.
According to the present invention, the impact can be mitigated only by considering the weight distribution of the airframe without taking any special measures.
[0005]
[Means for Solving the Problems]
Under the above-mentioned problems, the present invention has a tilling claw in a flat frame that is connected to a tractor by a hitch arm supported by a three-point link mechanism of a tractor and is supported by two front and rear wheels. The rotary tiller is suspended so that it can move up and down in the front-rear direction, and the portal arm is attached to the upper surface of the flat frame so that it can pivot in the left-right direction with two pivots in the front-rear direction. In the middle plowing weeder with a hitch body that receives the hitch arm in the front-rear direction,
When the left and right positions of the pivotal support shaft of the portal arm are moved closer to the tractor side than the left and right center of gravity of the aircraft, the front and rear positions of the hitch body are moved forward from the front and rear center of gravity of the aircraft and the hitch arm is lifted. An intermediate plowing weeder characterized in that when it is lowered outwardly becomes a forwardly rising posture, and when lowered, the rear wheel caster, the tilling claw, and the front wheel caster are grounded from the outside in this order.
[0006]
Further, according to the present invention, in the above-mentioned means, the side cover of the rotary tiller is shaped so that the rear is escaped upward, and the lower end is substantially grounded at the front and rear of the tilling claw. A plowing weeding machine characterized by suspending a flexible cover is provided.
[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 at predetermined intervals on the left and right sides of the front-rear part. 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]
As a result, when the rotary tiller 12 is lowered and the stopper 42 hits the bolt 40, the further lowering is restricted. Therefore, the lowering position of the rotary tiller 12 is set by adjusting the length of the bolt 40. 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. This is to prevent the mud from splashing forward and backward unnecessarily, and it is necessary to be lifted up in inspection or the like.
[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]
With such a configuration, the movement of the aircraft 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 movements 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. That is, at the time of work, the hitch arm 62 is lowered until the caster 14 is grounded. At this time, if the tillage shaft 46 is driven by the hydraulic motor 54 and the rotary tiller 12 is lowered to a predetermined position by the hydraulic cylinder 34. Thus, the middle tillage weeding work with the tilling claws 48 can be performed.
[0017]
FIG. 5 is a side view showing a state in which the middle tillage weeder is pulled up when turning or moving to another place, but the position of the hitch body 64 is moved forward from the front / rear center of gravity position of the body, When the middle tillage weeder is pulled up, the flat frame 10 is set to a forwardly rising posture.
[0018]
The degree of inclination is such that the rear wheel casters 14, the tilling claws 48, and the front wheel casters 14 are grounded in this order when the middle tillage weeder is lowered to the ground. By doing so, it becomes like soft landing in the landing of an airplane, and the impact can be mitigated.
[0019]
In addition, in connection with the above-mentioned, the back of the side cover 52 is made into the shape which escaped upwards.
This is because the rear surface of the side cover 52 is grounded at this time because the airframe is grounded in a front-up posture.
[0020]
Next, the left and right positions of the pivot shaft 16 of the gate-shaped arm 18 are also moved closer to the tractor T side than the left and right center of gravity position of the fuselage so that the flat frame 10 is in an outwardly lowered posture when the middle tiller is lifted. Keep it. In this way, mud or the like adhering to the tilling claws 48 and the like is scattered to the tractor T side and is not scattered to a person standing outside, and the state of the tilling claws 48 can be visually recognized while riding on the tractor T.
[0021]
Note that when the middle tiller is lifted, if the aircraft is lifted forward and lowered in this way, the left and right casters 14 will not touch the ground simultaneously when lowered and grounded. In this case as well, there is less impact than when all four wheels are grounded simultaneously.
[0022]
【The invention's effect】
As described above, the present invention is as described above, that is, when the hitch body is moved forward with respect to the longitudinal center of gravity of the aircraft and the hitch arm is lifted, the flat frame is in a forwardly raised posture, and When it is lowered, the rear wheel caster, the tilling claw, and the front wheel caster are grounded in this order, so it becomes like a soft landing at the landing of the airplane, and the impact is mitigated and the work safety is aimed at. Prevent equipment damage.
[0023]
At this time, if the horizontal position of the pivot shaft of the portal arm is moved closer to the tractor side than the left and right center of gravity of the fuselage, and the hitch arm is lifted, the flat frame will be in an outwardly lowered position. As well as preventing the mud soil adhering to the outside from being scattered, the state of the tilling claw can be visually recognized while riding on the tractor.
[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 Pivoting shaft 18 Portal arm 32 Pedestal shaft 34 Hydraulic cylinder 48 Tilling nail 52 Side cover 58 Cover 60 Cover 62 Hitch arm 64 Hitch body

Claims (3)

Connected by a hitch arm supported by the tractor's three-point linkage mechanism, it is arranged on the side of the tractor, and the rotary tiller part with tillage claws on the flat frame supported by the casters of the front and rear wheels can be moved up and down The portal arm is attached to the upper surface of the flat frame so that it can pivot in the left and right directions with two pivots, and the hitch arm can pivot in the middle of the portal arm. In the middle tillage weeder with the hitch body to receive
When the left and right positions of the pivotal support shaft of the portal arm are moved closer to the tractor side than the left and right center of gravity of the aircraft, the front and rear positions of the hitch body are moved forward from the front and rear center of gravity of the aircraft and the hitch arm is lifted. The middle tillage weeder is characterized in that when it falls down, it is in a forward-upward posture, and when lowered, the rear wheel caster, the tilling claw, and the front wheel caster are grounded from the outside in this order.   The middle-cultivated weeder according to claim 1, wherein the side cover of the rotary tiller is shaped so that the rear part escapes upward.   The middle tillage weeding machine according to claim 1 or 2, wherein a flexible cover whose lower end is substantially grounded is suspended from a front part and a rear part of the tilling claw.

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