JPH09168301A - Trench digging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an untrenched region at the beginning of trenching in a trench digging device for forming trenches in a field mainly for water drainage, etc. SOLUTION: This trench digging device can rapidly dig into soil each trenching blade 3 when beginning trenching by digging the trenching blade 3 in the soil and reduce an unfinished trenched region at the beginning of trenching by forming at least one of trenching blades for forming trenches in a field with a rotary blade 31 having radially extending plural claws.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a groove cutting device for forming a groove for draining water mainly in a field.

[0002]

2. Description of the Related Art Conventionally, this type of grooving device has been practical
As shown in FIG. 5 and shown in FIG. 5, the drive horizontal axis B is rotatably supported on the machine body A.
In addition, two groove cutting blades D each having a blade portion C provided around the outer periphery of the disk are attached to the machine body A, and soil excavated for cutting the soil between the cutting grooves formed by the rotation of the groove cutting blades D on the machine body A is excavated. The body E is provided to form a groove having a predetermined width.

[0003]

However, in the conventional grooving device, since all the grooving blades D are formed of a disc, the grooving blades D are made to bite into a predetermined depth in the soil. When starting the grooving to a predetermined depth by contacting the outer peripheral surface of the groove cutting edge D and both side surfaces over the entire circumference with soil, the contact resistance between the disk portion and the soil is large, and the groove cutting edge D is It is difficult to bite into a predetermined depth position in the soil, and it will bite slowly. Therefore, there is a problem that the distance by which the grooving edge of the grooving blade D reaches the predetermined depth becomes long, and the unfinished groove region where the groove having the predetermined depth cannot be formed at the start of grooving becomes long.

The main object of the present invention is to provide a grooving device capable of reducing the unfinished groove area at the start of grooving.

[0005]

In order to achieve the above main object, the present invention according to claim 1 provides a plurality of groove cutting blades 3 for forming a cutting groove in a field as shown in FIG. In the grooving device including the above and the soil body 7, at least one of the grooving blades 3 is formed by the rotary blade 31 having a plurality of radially extending cutting claws 31b.

[0006]

According to the first aspect of the invention, as shown in FIG. 1, the groove can be formed in the field by rotating the groove cutting blade 3.
At this time, since one of the groove cutting blades 3 is formed by the rotary blade 31 having a plurality of radially extending cutting claws 31b, when the groove cutting blades 3 are digging into the soil to start the groove cutting, Each groove cutting edge 3 compared to the one in which the groove cutting edge 3 of
You can quickly cut into the soil. Therefore, since a groove having a predetermined depth can be formed immediately after the start of grooving, the unfinished groove area at the start of grooving can be reduced.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The groove cutting device according to the embodiment shown in FIG. 1 has a PTO shaft of a tractor at the center in the left-right direction of a body 1 which is detachably connected to an elevating device having a lower link and a top link of the tractor. A rotary case 2 having a power transmission mechanism interlocked with is attached downward, and two groove cutting blades 3 and 3 for forming a cut groove in a field are detachably attached to a drive horizontal shaft 20 of the rotary case 2. A lifting frame 4 which is lifted and lowered by a lifting cylinder is connected to the front upper part of the machine body 1, and a support body 5 slidable in the left-right direction and a swingable pivot body are provided at the rear portion of the lifting frame 4. The earth-discharging body 7 is attached via the rod-shaped bracket 6 to be worn, and the earth-discharging body 7 is arranged behind the groove cutting blades 3, 3 at a predetermined interval, and the groove cutting blades 3, 3 rotate. The soil between the kerfs formed by Unishi to have. Further, the soil excavated body 7 is positioned behind the groove cutting blades 3 and 3 by sliding the support body 5 with respect to the elevating frame 4 and between the grooves formed by the groove cutting blades 3 and 3.

The soil excavation body 7 extends forward and downward from an intermediate portion in the vertical direction of the bracket 6, and has a stalk 71 having a flat stalk 71a at the tip, and an upper end part of the stalk 71 on one side. A projecting reversal plate 72 for projecting and removing soil plucked by the plow body 71 on one side of the field surface is provided, and a groove having approximately the same width as the plow tip 71a is provided on the lower rear surface of the ply body 71. A stabilizer 73 for depth adjustment is pivotally supported so as to be vertically swingable, and a rear end portion of the stabilizer 73 is connected to a lower end portion of the bracket 6 via a connecting rod 74 so as to be vertically adjustable. An adjusting device 8 having a handle for finely adjusting the height of the soil body 7 with respect to the elevating frame 4 is provided between the upper end of the bracket 6 and the support body 5.

One of the groove cutting edges 3 and 3 has a boss portion 30a having an insertion hole for the drive lateral shaft 20 at the center, a disc portion 30b attached to the boss portion 30a, and the disc portion. Thirty
Formed by a disc blade 30 having a blade portion 30c provided around the outer periphery of b,
The other is formed by a rotary blade 31 having an insertion hole for the drive horizontal shaft 20 in the central portion and four cutting claws 31b radially extending from each mounting piece of the boss portion 31a having four mounting pieces on the outer peripheral portion. doing. The rotary blade 31 is arranged inside the rotary case 2 and the disc blade 30 is arranged outside the rotary blade 31 with respect to the rotary case 2. Further, the groove cutting blades 3, 3 are arranged so as to have a spacing approximately the same as the width of the tip 71a of the plow body 71 of the earth-moving body 7.

In this rotary blade 31, four mounting pieces of the boss portion 31a are formed at equal intervals in the circumferential direction, and flat plate-shaped cutting claws 31b are radially attached to these four mounting pieces, and at the same time, these cutting claws are formed. The tip side of 31b is curved in the circumferential direction toward the counter-rotational direction to have a diameter substantially equal to that of the disc blade 30, and a kerf having a width substantially the same as that of the disc blade 30 and the same depth can be formed. I am trying. Since this rotary blade 31 bites a plurality of radially extending cutting claws 31b into the soil, the contact resistance with the soil when the rotary blade 31 bites into the soil is higher than that of the disc blade 30. It can be made small, and it is easy to bite into the soil. Therefore, when the rotary blade 31 and the disc blade 30 are combined, when the groove cutting blades 3 and 3 bite into the soil and start the groove cutting, all the groove cutting is performed. Compared with the blade 3 formed by the disc blade 30, the groove cutting blades 3, 3 can be quickly bited into the soil.

The number of cutting claws 31b may be any number as long as the groove cutting function is not impaired. Further, the rotary blade 31 may be configured such that four mounting piece portions of the boss portion 31a are formed in a disc shape, and the cut claws 31b are provided to project from the outer periphery of the disc portion, and the structure thereof is not particularly limited. Not done.

Further, the groove cutting blade 3 of the embodiment is mounted on the drive horizontal shaft 20 protruding rightward from the rotary case 2 so as to be positionally changeable at a predetermined interval in the axial direction, and the groove cutting blade corresponding to the groove width. It is possible to adjust the interval between the blades. The groove cutting blade 3 is at least two as in the embodiment.

Further, in the embodiment, an auxiliary blade 32 having the same shape as the disc blade 30 is detachably attached to the drive horizontal shaft 20 protruding leftward from the rotary case 2 so that the machine body 1 can be horizontally moved during the groove cutting work. The right and left stability of the direction is kept good. The auxiliary blade 32 is not always necessary, and in such a case, the groove cutting blades 3 may be arranged separately on the left and right sides of the rotary case 2.

In the above structure, when a groove for draining water is formed in the field, the groove cutting device is lowered to the rice field by the elevating device of the tractor, and the groove cutting blades 3, 3 are driven by the power from the drive horizontal shaft 20. When rotated counterclockwise (in the direction of the arrow) in FIG. 1, the groove cutting edges 3 and 3 form two grooves having a predetermined depth, and subsequently, the plow tip 71a of the plow body 71 in the soil excavator 7 is formed. The side bites into the soil, and the soil between the two cut grooves is plucked by the excavation body 7, has a predetermined width and depth, and a clean groove on the groove side surface can be formed. In this case, one of the groove cutting blades 3 and 3 is formed by the rotary blade 31 which has a small contact resistance with the soil and easily penetrates into the soil, so both are formed by the disc blade 30. It is possible to make the groove cutting edges 3 and 3 bite into the soil more quickly than in the case of a tool, and it is possible to form a groove having a predetermined depth immediately after the start of groove cutting. You can do it.

In the above embodiment, as the groove cutting edge 3,
Although the rotary blade 31 and the disc blade 30 are combined,
All may be formed by the rotary blade 31.

[Brief description of the drawings]

FIG. 1 is a perspective view in which a part of a groove cutting device of the present invention is omitted.

FIG. 2 is a side view of the groove cutting blade and the soil body.

FIG. 3 is a rear view of the groove cutting edge portion.

FIG. 4 is a side view of the groove cutting blade.

FIG. 5 is an explanatory view of a conventional example.

[Explanation of symbols] [Explanation of symbols]

 3 ... Groove cutting blade 31 ... Rotary blade 31b ... Cutting nail 7 ... Excavation body

Claims (1)

[Claims] 1. A grooving device comprising a plurality of grooving blades (3) for forming kerfs in a field, and a soil body (7),
At least one of the groove cutting blades (3) is formed by a rotary blade (31) having a plurality of radially extending cutting claws (31b).