JP7323403B2 - Drilling machine for planting seedlings - Google Patents

Description

The present invention relates to a seedling planting machine for digging holes for planting seedlings at predetermined intervals.

As a conventional drilling machine, it is a self-propelled drilling machine provided with a propulsion means, and is provided with a pair of augers in the left and right direction of the advancing direction of the propulsion means, and the spacing between the pair of augers can be adjusted. In addition, the pair of augers are provided so as to be able to move up and down by a support device, and when the column is erected at the end of the propulsion means, the support device axially fixes the column to the main body at the lower end, The column is supported by a column so that the column is fixed in a desired upright or inclined state, and the column is pivotable at its lower end so that it can rotate in the longitudinal direction of the propulsion means, and the column has its length. The angle of the pillars can be adjusted by expanding and contracting the pillars, and by expanding and contracting the length of the pillars, the angles of the pair of augers can be adjusted in the longitudinal direction of the propelling means (see Patent Document 1).

JP-A-11-125085

However, in the conventional drilling machine, adjusting the angle of the auger requires an operation of adjusting the length of the support according to the inclination of the ground G, which is extremely troublesome.
In addition, since the angle can only be adjusted in the front-rear direction of the prop propelling means, if the ground G is tilted laterally with respect to the advancing direction of the propelling means, the angle of the auger cannot be adjusted in the direction of inclination of the ground G. therefore cannot be used.
In addition, since the inclination of the ground G is not always constant, there is also a problem that the length of the support must be adjusted each time.

A problem to be solved by the present invention is to provide a seedling planting machine that does not require adjustment of the inclination angle of the auger according to the inclination angle of the ground G.

In order to solve the above problems, the seedling planting drilling machine according to claim 1 is equipped with a drilling machine before or after the propulsion means,
The drilling machine is provided with a pair of augers in the horizontal direction of the advancing direction of the propulsion means,
Both augers are vertically slidable along the slide rail together with the motor bracket of the auger drive motor by a hydraulic cylinder provided on the slide rail,
Both augers are provided at the ends of slide shafts that can be slid in the horizontal direction along the respective slide rails with respect to the drilling machine, and are capable of adjusting the distance between the two augers.
Both slide rails having the augers are provided so as to be able to swing at least in the direction of travel of the propulsion means with respect to the tip of the slide shaft, respectively, so that both augers can It is characterized in that it is configured to always maintain a vertical state by gravity due to its own weight.

Further, the seedling planting hole digging machine according to claim 2 is the seedling planting hole digging machine according to claim 1,
It is characterized by comprising driving means for driving extension and contraction of both the slide shafts.

The seedling planting drilling machine according to claim 3 is characterized in that, in the seedling planting drilling machine according to claim 2 , the drive means is located between the intermediate portion of the slide rail and the tip of the slide shaft. A threaded pipe provided along the slide rail, a screw that is screwed into the threaded pipe and whose base end is connected and supported to the base end side of the slide rail, and an electric drive that rotates the screw forward and backward via a reduction gear. and a motor.

Further, the seedling planting hole digging machine according to claim 4 is the seedling planting hole digging machine according to claim 3,
Equipped with a rotation speed sensor that measures the rotation of the screw in the gear,
It is characterized in that the space between both augers is adjusted from the number of rotations of the screw measured by the rotation number sensor.

Further, the seedling planting hole digging machine according to claim 5 is the seedling planting hole digging machine according to any one of claims 1 to 4,
Both slide rails having the augers are provided so as to be able to swing in the lateral direction of the propulsion means with respect to the tip of the slide shaft, respectively, so that both augers can be swung regardless of the inclination angle of the ground G in the lateral direction of the propulsion means. It is characterized in that it is configured to always maintain a vertical state by gravity due to its own weight.

Further, the seedling planting hole digging machine according to claim 6 is the seedling planting hole digging machine according to any one of claims 1 to 5,
Each of the slide rails has an excavation regulation means for regulating the excavation depth by the auger,
The excavation restricting means includes a shaft movably provided along each slide rail, a coil spring that pushes the shaft downward, and an auger that excavates the ground G and the lower end of the shaft abuts the ground G to press the coil spring. and a limit switch for stopping the driving of the hydraulic cylinder when the upper end of the shaft abuts when the shaft rises against the pressure.

Further, the seedling planting hole digging machine according to claim 7 is the seedling planting hole digging machine according to any one of claims 1 to 6,
Upper limit adjusting means for the motor bracket is provided between each slide rail and the motor bracket,
The upper limit adjusting means is composed of a limit switch provided on the motor bracket side and a stopper provided on the slide rail side. When the motor bracket rises and the limit switch comes into contact with the stopper, the driving of the hydraulic cylinder is stopped. It is characterized by being configured as follows.

Further, the seedling planting hole digging machine according to claim 8 is the seedling planting hole digging machine according to any one of claims 1 to 7,
The excavator is provided with an inclination angle sensor for measuring the inclination angle of the excavator in a direction orthogonal to the direction of travel of the propulsion means, and the distance between the two augers is adjusted to a predetermined distance according to the measured angle. It is characterized by comprising control means for more incremental correction.

Further, the seedling planting hole digging machine according to claim 9 is the seedling planting hole digging machine according to any one of claims 1 to 8,
A rotation speed sensor is provided for measuring the rotation speed of the driving motor of the propulsion means. It is characterized by comprising control means for controlling the interval to.

Further, the seedling planting hole digging machine according to claim 10 is the seedling planting hole digging machine according to claim 9,
The excavator is provided with an inclination angle sensor for measuring the inclination angle of the excavator in the advancing direction of the propulsion means, and is provided with control means for increasing and correcting the movement distance of the propulsion means in accordance with the measured angle. Characterized by

Further, the seedling planting hole digging machine according to claim 11 is the seedling planting hole digging machine according to any one of claims 1 to 10,
The drilling machine is provided detachably with respect to the propulsion means,
The drilling machine includes a plurality of support legs capable of maintaining the drilling machine in an upright position in a state separated from the propulsion means,
The support leg is configured to be vertically retractable with respect to a pipe provided on the frame of the drilling machine.

Further, the seedling planting hole digging machine according to claim 12 is the seedling planting hole digging machine according to any one of claims 1 to 11,
The driving of the propulsion means is radio controlled.

In the seedling planting machine according to claim 1, as described above, the machine can dig two holes at the same time by providing a pair of augers in the lateral direction of the advancing direction of the propulsion means. .
Both augers are slidable up and down along the slide rail together with the motor bracket of the auger drive motor by hydraulic cylinders provided on the respective slide rails. It is possible to adjust the interval between both augers by providing it at the tip of a slide shaft that can slide in the left-right direction along and extend and retract.
Further, both slide rails having augers are provided so as to be capable of swinging at least in the direction of travel of the propulsion means with respect to the tip of the slide shaft, respectively, so that both augers can be swung regardless of the inclination angle of the ground G in the direction of travel of the propulsion means. , the vertical state can always be maintained by gravity due to its own weight without requiring any special operation.

In the seedling planting hole digging machine according to claim 2, as described above, the distance between the two augers is automatically adjusted without manual work by providing the drive means for driving the expansion and contraction of the two slide shafts. can do.

In the seedling planting machine according to claim 3, as described above, the drive means includes a screw pipe provided along the slide rail between the intermediate portion of the slide rail and the tip of the slide shaft; By constructing a screw that is screwed inside and whose base end is connected and supported to the base end side of the slide rail, and an electric motor that drives the screw in forward and reverse rotation via a reduction gear, both slide rails The expansion and contraction can be automatically performed without driving the electric motor manually.

In the seedling planting machine according to claim 4, as described above, the rotation speed sensor for measuring the rotation of the screw is provided in the gear. The spacing between them can be adjusted.

In the seedling planting hole digging machine according to claim 5, as described above, both slide rails provided with augers are provided so as to be swingable also in the lateral direction of the propulsion means with respect to the tip of the slide shaft. , both augers can always be maintained in a vertical state by gravity due to their own weight without requiring a special operation regardless of the inclination angle of the ground G in the horizontal direction of the propulsion means.

In the seedling planting machine according to claim 6, as described above, each slide rail is provided with an excavation restricting means for restricting the excavation depth by the auger, so that the hydraulic cylinder can be operated at an arbitrary excavation depth. You can stop driving.

In the seedling planting machine according to claim 7, as described above, the motor bracket upper limit adjusting means is provided between each slide rail and the motor bracket. Work efficiency can be improved by stopping the auger in the middle without raising it to the top end.

In the seedling planting machine according to claim 8, as described above, the machine is provided with a tilt angle sensor for measuring the tilt angle of the machine in a direction orthogonal to the advancing direction of the propulsion means. and control means for correcting the distance between the two augers to be larger than the predetermined distance according to the measured angle, so that when the propulsion means is advanced on the inclined ground G in a direction orthogonal to the direction of inclination, the horizontal The spacing between the holes in the direction can be automatically corrected to a predetermined spacing.

According to the ninth aspect of the seedling planting machine, as described above, a rotation speed sensor is provided for measuring the rotation speed of the traveling drive motor of the propulsion means, and the rotation speed measured by the rotation speed sensor is used to detect the rotation speed of the propulsion means. By providing a control means for controlling the distance from one pair of holes to the next pair of holes by measuring the distance moved by the two augers, it is possible to move to the next hole digging work after the completion of the digging work by both augers. The travel distance of the propulsion means can be automatically controlled.

In the burrowing machine for planting seedlings according to claim 10, as described above, the burrowing machine is provided with an inclination angle sensor for measuring the inclination angle of the burrowing machine in the advancing direction of the propulsion means. By providing a control means for increasing and correcting the moving distance of the propulsion means according to the angle, when the propulsion means is advanced in the inclined direction on the sloped ground G, the interval between the holes in the horizontal direction is automatically corrected to a predetermined interval. be able to.

In the seedling planting machine according to claim 11, as described above, the machine is provided with a plurality of support legs capable of maintaining the machine in an upright state while being separated from the propulsion means. By providing it, the separated excavator can be maintained in a stable state.

In the seedling planting machine according to claim 12, as described above, the propulsion means is radio-controlled, so that the digging work, which is often performed on slopes, can be performed safely and efficiently. It can be carried out.

1 is a plan view showing the appearance of a seedling planting drilling machine of Example 1. FIG. 1 is a front view showing the appearance of the seedling planting drilling machine of Example 1. FIG. 1 is a side view showing the appearance of the seedling planting drilling machine of Example 1. FIG. FIG. 2 is a plan view showing the internal structure of the seedling planting drilling machine of Example 1. FIG. 5 is a side view of FIG. 4; FIG. FIG. 5 is a cross-sectional plan view taken along line AA of FIG. 4; FIG. 5 is a longitudinal side view taken along line BB of FIG. 4; It is a front view which shows the accommodation state which shortened the space|interval of both augers. FIG. 10 is a front view showing a state in which the distance between both augers is widened to the maximum. It is a side view which shows the time of the descent stop of both augers. It is a side view which shows the time of the rise stop of both augers. It is a side view which shows the digging machine at the time of storage. FIG. 10 is a front view showing a state in which the arm is extended and the pointer indicates the next digging point; FIG. 10 is an explanatory view showing the time of climbing work in forward movement along an inclined surface; FIG. 10 is an explanatory view showing the time of climbing work in reverse along an inclined surface; FIG. 10 is an explanatory diagram showing a contour line work; Fig. 10 is a plan view showing the appearance of the seedling planting drilling machine of Example 2; Fig. 10 is a front view showing the appearance of the seedling planting drilling machine of Example 2; Fig. 10 is a side view showing the appearance of the seedling planting drilling machine of Example 2;

Embodiments of the present invention will be described below with reference to the drawings.

First, the seedling planting machine of the first embodiment will be described with reference to the drawings.
The drilling machine for planting seedlings according to the first embodiment includes a propulsion means 1 and a drilling machine 2, as shown in FIGS.
More specifically, the propulsion means 1 can travel in the longitudinal direction and steer in the lateral direction on the endless track 11 . The propulsion means 1 includes a traveling pump 12 for driving the endless track 11, a PTO pump 13 for driving an auger described later, a gear pump 14 for driving the hydraulic cylinder 23 described later, a PTO pump 13, and a gear pump 14. and an engine 15 for driving.

The drilling machine 2 is detachably attached to the front side of the propulsion means 1 .
The excavator 2 is provided with a pair of augers 21 arranged in a left-right direction orthogonal to the direction of travel of the propulsion means 1. Both augers 21 are driven by hydraulic cylinders 23 provided on slide rails 22, respectively, and motor brackets 25 of auger drive motors 24 are driven. Along with the slide rail 22, it is equipped so that up-and-down sliding is possible.
The slide rail 22 is provided at the tip of a slide shaft 26 that slides in the lateral direction with respect to the drilling machine 2 and is extendable, so that the distance between the augers 21 and 21 can be adjusted.
Both slide shafts 26 are provided with drive means 5 for driving extension and contraction of the slide shafts 26 .
As shown in FIG. 6, the driving means 5 is screwed into a threaded pipe 51 provided along the slide shaft 26 between the intermediate portion of the slide rail 22 and the tip of the slide shaft 26, It is composed of a screw 52 whose base end is connected to and supported by the base end of the slide rail 22 and an electric motor 54 that drives the screw 52 forward and reverse through a reduction gear 53 . In the figure, reference numeral 55 denotes a roller that guides the sliding of the slide shaft 26. As shown in FIG.

By providing a rotation speed sensor (not shown) for measuring the rotation of the screw 52 in the box 53a of the gear 53, the distance between the augers 21 and 21 can be determined from the rotation speed of the screw 52 measured by the rotation speed sensor. It is designed to be adjusted.

As shown in FIG. 6, both the slide rails 22 are provided to the tip of the slide shaft 26 so as to be swingable along the traveling direction of the propulsion means 1 about the pivot 27, and are fixed to the pivot 27. Both slide rails 22 can freely swing back and forth and left and right by gravity due to their own weights by being provided swingably about the pivot 29 of the yoke 28 in a direction orthogonal to the direction of travel of the propulsion means 1. , both augers 21 are configured to always maintain a vertical state by gravity due to their own weights regardless of the inclination angle of the ground G on which the propulsion means 1 runs (see FIGS. 14 to 16).

Further, each slide rail 22 is provided with excavation restricting means 3 for restricting the excavation depth of the auger 21 .
As shown in FIG. 10 , the excavation restricting means 3 excavates the ground G by means of a shaft 31 movably provided along each slide rail 22 , a coil spring 32 that pushes down the shaft 31 , and an auger 21 . and a limit switch 33 for stopping the drive of the hydraulic cylinder 23 when the lower end of the shaft 31 abuts the ground G and the shaft 31 rises against the pressing force of the coil spring 32 so that the upper end of the shaft 31 comes into contact with the ground G. there is

Upper limit adjusting means 4 for the motor bracket 25 is provided between each slide rail 22 and the motor bracket 25 .
As shown in FIG. 11, the vertical adjustment means 4 comprises a limit switch 41 provided on the motor bracket 25 side and a stopper 42 provided on the slide rail 22 side. contacts the stopper 42 to stop the driving of the hydraulic cylinder 23 . The height of the stopper 42 is adjustable with respect to the slide rail 22, so that the depth of digging by the auger 21 can be adjusted.

Although not shown, the excavator 2 is provided with an inclination angle sensor for measuring the inclination angle of the excavator 2 in a direction orthogonal to the direction of travel of the propulsion means 1. Equipped with control means (not shown) for increasing the distance between the augers 21 and 21 from a predetermined distance

Further, a rotation speed sensor (not shown) for measuring the rotation speed of the running pump 12 of the propulsion means 1 is provided. Control means are provided for controlling the spacing from one pair of holes to the next pair of holes.

The excavator 2 is provided with an inclination angle sensor (not shown) for measuring the inclination angle of the excavator 2 in the direction of travel of the propulsion means 1, and the travel distance of the propulsion means 1 is increased according to the measured angle. A correction control means (not shown) is provided.

As shown in FIGS. 4, 5, and 12, the excavator 2 is detachably attached to the propulsion means 1, and the excavator 2 is separated from the propulsion means 1. It has a plurality of support legs 3a that can be maintained in an upright state.
The support leg 3a is configured to be vertically retractable with respect to a pipe 3b provided on the frame 2a of the drilling machine 2. As shown in FIG.

As shown in FIGS. 13 and 16, the excavator 2 has a pair of slide shafts 26 (in the first embodiment, the slide shaft 26 on the left side with respect to the traveling direction of the propulsion means 1). A digging interval setting arm 26a which can be attached in an expandable state is provided, and an indicator 26b for supporting a digging point is swingably suspended at the tip of the arm 26a.

The travel drive of the propulsion means 1 and the rotation, stop, and elevation drive operations of both augers 21 are performed by radio control.

Next, the operation of Example 1 will be described.
(1) "Advance the propulsion means along the slope"
Since the seedling planting machine of the first embodiment is constructed as described above, when digging a hole while advancing the propulsion means 1 along the slope, first, both augers 21, 21 are mutually displaced. The interval between them is set to the planting interval of the seedlings 6 .
Next, at the first digging point, the hydraulic cylinder 23 is driven downward to lower the augers 21, 21 to dig a hole, and as shown in FIG. At that time, the upper end of the shaft 31 pushes the switch of the limit switch 33 provided on the slide rail 22, thereby stopping the driving of the hydraulic cylinder 23 and finishing the digging.
Next, when the hydraulic cylinder 23 is driven upward to raise both augers 21, 21, as shown in FIG. 42, the switch is pressed, and the hydraulic cylinder 23 stops. This completes the drilling once.
Next, the propulsion means 1 is advanced by a predetermined planting distance, and the above operations are repeated.

(2) "Advance the propulsion means along the direction perpendicular to the slope"
When digging a hole while advancing the advancing means 1 along the direction perpendicular to the slope, it is necessary to correct the interval between the two augers 21, 21 to be longer than the interval between the seedlings 6. That is, as shown in FIG. 16, the interval W2 between the holes (planting interval of the saplings 6) along the inclined surface is narrower than the interval W1 between the augers 21, 21. As shown in FIG.
In this work, an arm 26a is attached to the slide shaft 26 on the left side of the propulsion means 1 in the traveling direction, and the digging position of the second row is marked. This mark position also needs to be corrected as described above.
The digging operation is the same as in the above case.

Next, the effects of the first embodiment will be described. In the seedling planting machine of the first embodiment, as described above, the digging machine 2 has a pair of augers 21 arranged in the lateral direction of the advancing direction of the propulsion means 1. It allows you to dig two holes at the same time.
Both augers 21 are vertically slidable along slide rails 22 together with motor brackets 25 of auger drive motors 24 by hydraulic cylinders 23 provided on slide rails 22. Slide rails 22 are used for boring. It is possible to adjust the interval between both augers 21, 21 by providing it at the tip of a slide shaft 26 that can slide in the left-right direction with respect to the machine 2 and can be expanded and contracted.

Further, by providing the driving means 5 for driving the expansion and contraction of both the slide shafts 26, the distance between the two augers 21, 21 can be automatically adjusted without manual work.

Further, the drive means 5 is screwed into a threaded pipe 51 provided along the slide shaft 26 between the intermediate portion of the slide rail 22 and the tip of the slide shaft 26, and the base end of the slide shaft 26 is screwed into the threaded pipe 51. 26, and an electric motor 54 that rotates the screw 52 in forward and reverse directions via a reduction gear 53. The drive allows automatic operation without manual work.

Further, by providing a rotation speed sensor for measuring the rotation of the screw 52 in the reduction gear 53, the distance between the two augers 21, 21 can be adjusted from the rotation speed of the screw 52 measured by the rotation speed sensor.

Further, both slide rails 22 provided with augers 21 are provided so as to be swingable at least in the direction of travel of the propulsion means 1 with respect to the tip of the slide shaft 26, respectively, so that the angle of inclination of the ground G in the direction of travel of the propulsion means 1 can be changed. Regardless, both augers can always be maintained in a vertical state by gravity due to their own weight without requiring any special operation.

In addition, both slide rails 22 provided with augers 21 are provided so as to be swingable also in the horizontal direction of the propulsion means 1 with respect to the tip of the slide shaft 26, respectively, so that the inclination angle of the ground G in the horizontal direction of the propulsion means 1 can be adjusted. Regardless, the two augers 21, 21 can always be maintained in a vertical state by gravity due to their own weight without requiring any special operation.

Further, each slide rail 22 is provided with an excavation restricting means 3 for restricting the excavation depth by the auger 21, so that the driving of the hydraulic cylinder 23 can be stopped at an arbitrary excavation depth.

Further, by providing the upper limit adjustment means 4 of the motor bracket 25 between each slide rail 22 and the motor bracket 25, the auger 21 is stopped halfway without being raised to the uppermost end during continuous digging work. Thereby, work efficiency can be improved.

Further, the excavator 2 is provided with an inclination angle sensor for measuring the inclination angle of the excavator 2 in a direction orthogonal to the direction of travel of the propulsion means 1, and the distance between the two augers is determined according to the measured angle. more than a predetermined interval, automatically correcting the interval between the holes in the horizontal direction to the predetermined interval when the propulsion means is advanced in a direction orthogonal to the inclination direction with respect to the sloped ground G. be able to.

Further, a rotation speed sensor for measuring the rotation speed of the driving motor 16 of the propulsion means 1 is provided. By providing control means for controlling the distance to the pair of holes, it is possible to automatically control the traveling distance of the propulsion means 1 for moving to the next hole digging work after the completion of the digging work by both augers.

In addition, the excavator 2 is provided with an inclination angle sensor for measuring the inclination angle of the excavator 2 in the direction of travel of the propulsion means 1, and control means for increasing and correcting the movement distance of the propulsion means according to the measured angle. is provided, when the propulsion means 1 is advanced in the inclined direction with respect to the sloping ground G, the interval between the holes in the horizontal direction can be automatically corrected to a predetermined interval.

Further, the excavator 2 is provided with a plurality of support legs 3a capable of maintaining the excavator 2 in an upright state in a state separated from the propulsion means 1, thereby stabilizing the excavator 2. state can be maintained.

In addition, since the traveling drive of the propulsion means 1 is performed by radio control, it is possible to safely and efficiently perform digging work, which is often performed on slopes.

Another embodiment will now be described. In the explanation of this other embodiment, the illustration of the same components as those of the first embodiment is omitted, or the same reference numerals are given to omit the explanation thereof, and only the points of difference will be explained.

As shown in FIGS. 17 to 19, the seedling planting machine of the second embodiment is different from the above-described embodiment in that it is equipped with a propulsion means 1 and a packing box 7 on which a plurality of seedlings 6 are placed. 1 is different.

Although the present embodiment has been described above, the present invention is not limited to the above-described embodiments, and the present invention includes any design changes that do not deviate from the gist of the present invention.

For example, in Embodiment 1, the digging interval setting arm 26a that can be attached in a telescopic state along the left slide shaft 26 with respect to the traveling direction of the propulsion means 1 is provided, but the right slide shaft 26, Alternatively, it may be provided on both the left and right sides.

Reference Signs List 1 propulsion means 11 track 12 running pump 13 driving PTO pump 14 gear pump 15 engine 16 running motor 2 drilling machine 2a frame 21 auger 22 slide rail 23 hydraulic cylinder 24 auger drive motor 25 motor bracket 26 slide shaft 26a arm 26b Indicator 27 Pivot 28 Yoke 29 Pivot 3 Excavation restricting means 3a Supporting leg 3b Pipe 31 Shaft 32 Coil spring 33 Limit switch 4 Upper limit adjusting means 41 Limit switch 42 Stopper 5 Driving means 51 Screw pipe 52 Screw 53 Reduction gear 53a Gearbox 54 Electric motor 55 Roller 6 Seedling 7 Packing box G Ground W1 Spacing between both augers W2 Spacing between holes

Claims (12)

Equipped with a drilling machine either before or after the propulsion means,
The drilling machine is provided with a pair of augers in the horizontal direction of the advancing direction of the propulsion means,
Both augers are vertically slidable along the slide rail together with the motor bracket of the auger drive motor by a hydraulic cylinder provided on the slide rail,
Both augers are provided at the ends of slide shafts that can be slid in the horizontal direction along the respective slide rails with respect to the drilling machine, and are capable of adjusting the distance between the two augers.
Both slide rails having the augers are provided so as to be able to swing at least in the direction of travel of the propulsion means with respect to the tip of the slide shaft, respectively, so that both augers can A hole digging machine for planting seedlings, characterized in that it is constructed so as to always maintain a vertical state by gravity due to its own weight. In the seedling planting hole digging machine according to claim 1,
A drilling machine for planting seedlings, comprising a driving means for driving expansion and contraction of both the slide shafts. 3. The drilling machine for planting seedlings according to claim 2 , wherein said driving means comprises a threaded pipe provided along the slide rail between the intermediate portion of the slide rail and the tip of the slide shaft, and screwed into the threaded pipe. , a screw whose base end is connected to and supported by the base end of a slide rail, and an electric motor that rotates the screw forward and backward through a reduction gear. digging machine. In the seedling planting hole digging machine according to claim 3,
Equipped with a rotation speed sensor that measures the rotation of the screw in the gear,
A hole digging machine for planting seedlings, characterized in that the distance between both augers is adjusted based on the rotation speed of the screw measured by the rotation speed sensor. In the seedling planting hole digging machine according to any one of claims 1 to 4,
Both slide rails having the augers are provided so as to be able to swing in the lateral direction of the propulsion means with respect to the tip of the slide shaft, respectively, so that both augers can be swung regardless of the inclination angle of the ground G in the lateral direction of the propulsion means. A hole digging machine for planting seedlings, characterized in that it is constructed so as to always maintain a vertical state by gravity due to its own weight. In the seedling planting hole digging machine according to any one of claims 1 to 5,
Each of the slide rails has an excavation regulation means for regulating the excavation depth by the auger,
The excavation restricting means includes a shaft movably provided along each slide rail, a coil spring that pushes the shaft downward, and an auger that excavates the ground G and the lower end of the shaft abuts the ground G to press the coil spring. A seedling planting hole digging machine, comprising: a limit switch for stopping driving of a hydraulic cylinder by contacting the upper end of the shaft when the shaft rises against pressure. In the seedling planting hole digging machine according to any one of claims 1 to 6,
Upper limit adjusting means for the motor bracket is provided between each slide rail and the motor bracket,
The upper limit adjusting means is composed of a limit switch provided on the motor bracket side and a stopper provided on the slide rail side. When the motor bracket rises and the limit switch comes into contact with the stopper, the driving of the hydraulic cylinder is stopped. A hole digging machine for seedling planting characterized by being configured as follows. In the seedling planting hole digging machine according to any one of claims 1 to 7,
The excavator is provided with an inclination angle sensor for measuring the inclination angle of the excavator in a direction orthogonal to the direction of travel of the propulsion means, and the distance between the two augers is adjusted to a predetermined distance according to the measured angle. A drilling machine for planting seedlings, characterized in that it comprises control means for increasing correction. In the seedling planting hole digging machine according to any one of claims 1 to 8,
A rotation speed sensor is provided for measuring the rotation speed of the driving motor of the propulsion means. A hole digging machine for seedling planting, characterized by comprising a control means for controlling the interval to. In the seedling planting hole digging machine according to claim 9,
The excavator is provided with an inclination angle sensor for measuring the inclination angle of the excavator in the advancing direction of the propulsion means, and is provided with control means for increasing and correcting the movement distance of the propulsion means in accordance with the measured angle. Hole digging machine for seedling planting characterized. In the seedling planting hole digging machine according to any one of claims 1 to 10,
The drilling machine is provided detachably with respect to the propulsion means,
The drilling machine includes a plurality of support legs capable of maintaining the drilling machine in an upright position in a state separated from the propulsion means,
A drilling machine for planting seedlings, wherein the support leg is configured to be vertically retractable with respect to a pipe provided on a frame of the drilling machine. In the seedling planting hole digging machine according to any one of claims 1 to 11,
A drilling machine for planting seedlings, wherein the traveling drive of the propulsion means is performed by radio control.

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