JPH0346036Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a device for performing drilling work necessary for planting trees, etc.

[Conventional technology]

In the past, drilling work in farms such as orchards was usually done manually, but this work was not only inefficient, but also had the problem that the shapes of the drilled holes varied. .

[Problem that the invention attempts to solve]

This invention was made in order to solve the above-mentioned conventional problems, and its purpose is to provide a drilling device that can efficiently drill holes of a fixed shape.

[Means for solving problems]

In order to solve the above-mentioned problems, the perforating device of this invention is provided with a plurality of screws inclined in a direction intersecting with the axis around a rotation center shaft having a screw blade and a leading blade at the lower end. The technical means is to interpose a gear mechanism between the screw and the rotation center axis, which causes the screw to revolve around the rotation center axis while rotating on its own axis as the rotation center axis rotates.

[Effect]

According to the above method, the plurality of screws revolve around the central axis of rotation while rotating, so that by simply pressing the perforating device against the field, the soil within the orbit of the screws is dug up, and a hole of a certain shape is formed. Can be efficiently drilled in any location. In particular, since drilling is done by the simultaneous rotation and revolution of multiple screws, it is possible to drill a large hole even if the diameter of the screw blade itself is small, compared to drilling with a single screw. Moreover, the soil removal efficiency is excellent, and the screw can be easily pulled out from inside the hole after drilling. In addition, the soil wall surface of the drilled hole is plowed up with a screw during drilling, so that it blends well with the soil backfilled into the hole.

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

〔Example〕

In the drilling device illustrated in FIG. 1, a rotation center shaft 1 is equipped with a screw blade 2 and a conical leading blade 3 at its lower end, and a transmission gear box 5 equipped with a power intake shaft 4 at its upper end. ing. Screws 6 are arranged at a plurality of locations (three locations in the illustrated example: see FIGS. 2 and 3) at equal angles around the rotation center axis 1. These screws 6 are inclined in a direction crossing the axis of the rotation center axis 1, that is, in a direction in which the distance from the rotation center axis 1 gradually decreases as the distance from the rotation center axis 1 approaches the lower end of the screw 6, and the upper end thereof is connected to the gear. It is connected to the rotation center shaft 1 by a mechanism 7. That is, the gear mechanism 7 is interposed between the rotation center shaft 1 and the plurality of screws 6, and is housed in a case 8 fixed to the transmission gear box 5. The illustrated gear mechanism 7 is a large-diameter main gear 7a fixed to the rotation center shaft 1.
It consists of a small-diameter first auxiliary gear 7b and a second auxiliary gear 7c fixed to the screw 6, and a large-diameter fixed gear 7d screwed to the case 8, and the first auxiliary gear 7b is attached to the main gear 7a. On the other hand, the second auxiliary gear 7c is meshed with the fixed gear 7d. The screw 6 is supported by a circular support plate 9 so as to be rotatable only with respect to the rotation center axis 1. Further, the plurality of screws 6 are connected to each other by a support 10 and a circular plate 11 which are fitted onto the rotation center shaft 1.

The perforation device described above is used, for example, as an attachment for an agricultural Taylor tiller. In that case, as shown in FIG. 1, the case 8 is attached to the support rod 12 extending from the tiller, and the power intake shaft 4 is connected to the power take-off shaft (not shown) of the tiller by, for example, a universal joint 13. Connected via
The engine (not shown) is used as a power source. In this way, the punching device can be easily moved anywhere.

In such a drilling device, for example, when the main gear 7a is rotated counterclockwise together with the rotation center shaft 1 as shown by arrow A in FIG. Attempts to rotate in the same direction. However, as shown in FIG. 1, the second auxiliary gear 7c is fixed to the screw 6.
Since the second auxiliary gear 7c is meshed with the fixed gear 7d, the second auxiliary gear 7c kicks the fixed gear 7d as shown by arrow C in FIG. Therefore, the screw 6 revolves clockwise around the rotation center axis 1 while rotating clockwise as the rotation center axis 1 rotates counterclockwise. Therefore, if the drilling device is pressed against the ground such as a field, the screw blade 2 will dig into the ground while being guided by the leading blade 3.
Next, the screw 6 digs up the ground and makes a hole. As a result, a hole having approximately the same diameter as the maximum diameter of the orbit of the screw 6 is bored in the ground, and the soil wall surface of the hole is plowed by the screw 6. In this case, during drilling, the screw 6 rotates to efficiently till the dug up soil to the surrounding area, and after drilling is completed, the screw 6 can be easily pulled out of the hole by pulling up the drilling device. In the illustrated example, the plurality of screws 6 include a support plate 9, a support 10, and a circular plate 1.
1, so that these screws 6 do not deflect under the reaction forces they experience during drilling.

FIG. 4 and FIG. 5 show a specific structure of the above-mentioned support 10. As clearly shown in the figure, the support 10 includes a plurality of arms 10a (three in the illustrated example) arranged at equal angles, and the ends of these arms 10a in the direction of revolution of the screw 6 (arrow C) are lower. It is slanted so that If this is done, the soil dug up by the screw blades 2 will be thrown up by the support 10, which has the advantage of further increasing the efficiency of soil removal by the screw 6. Also, as shown in Figure 5, arm 1
If an edge 10b is provided at the lower end of 0a,
Since the arm 10a itself can be provided with a tilling function, there is an advantage that the quality of tilled soil is improved. In FIGS. 4 and 5, reference numeral 10c indicates a fitting ring that is fitted around the rotation center shaft 1 so as to be relatively rotatable.

In this invention, the number of screws and the angle of inclination are not limited to those shown in the illustration, but can be determined as appropriate, taking into account the properties of the soil to be drilled, the size of the hole to be drilled, the type of power source, etc. should be selected.
For example, in the case of hard soil, a smaller inclination angle makes it easier to drill holes, and a larger inclination angle allows for larger diameter holes to be drilled. Furthermore, if the number of screws is large, the load on a single screw will be reduced, and weight and cost reductions will be achieved. On the other hand, by changing the mounting angle of the support rod (see Figure 1), it is possible to work on a slope with the same efficiency as on a flat ground.

[Effect of idea]

As is clear from the above explanation, the drilling device of this invention makes it possible to efficiently drill holes of a fixed shape at any location.Furthermore, the screw can be easily pulled out from inside the hole after drilling. Even when holes must be drilled in a large number of locations, such as when planting trees on roads or roads, the holes can be drilled with less effort. Moreover, even if the diameter of the blade of the screw itself is small, a large hole can be bored. In addition, the soil wall surface of the drilled hole blends well with the backfilled soil. This simplifies tasks such as irrigation, drainage, and fertilization, encourages the growth of fine roots in plants, and helps prevent oxygen deficiency. In particular, since the perforating device of this invention connects the rotational center shaft and the screw through a gear mechanism, its overall configuration is compact, making it suitable for use in engine-powered working machines such as agricultural Taylor cultivators. It is suitable for drilling, is easy to move, and is extremely effective in drilling work not only on flat land but also on sloped land.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing a drilling device according to an embodiment of the invention, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, and Fig. 3 is a cross-sectional view taken along line B-B in Fig. 1. , FIG. 4 is a cross-sectional view taken along the line CC in FIG. 1, and FIG. 5 is a cross-sectional view taken along the line D-D in FIG. 4. 1... Rotation center axis, 6... Screw, 7...
Gear mechanism.

Claims (1)

[Scope of utility model registration request] A plurality of screws are provided around a rotation center shaft having a screw blade and a leading blade at the lower end thereof, and are inclined in a direction crossing the axis of the rotation center shaft. A drilling device characterized in that a gear mechanism is interposed that causes the screw to revolve around a rotation center axis while rotating on its own axis as the shaft rotates.