JP3141867U - Earth auger tip drilling head - Google Patents

Abstract

Drilling a hole without requiring a large rotational output.
A tip excavation head A of an earth auger of an excavator 1 has a first excavation portion 6 to which a plurality of distal end bits 8 are attached, and has a larger diameter than the first excavation portion 6. It comprises a second excavation part 7 provided with a plurality of cutting bits 10 on the peripheral edge of a spiral excavation blade 9. A drilling hole B having a small diameter D2 is excavated by the first excavation unit 6, and then the excavation blade 9 of the second excavation unit 7 is excavated while gradually increasing the diameter D1. Since excavation is performed by expanding the diameter D1 in two stages, a large output is not required.
[Selection] Figure 1

Description

  The present invention relates to an excavation head attached to the tip of an earth auger for excavating a hole in the ground.

An earth auger exists as a device for excavating the ground to form a hole.
As this earth auger, a thing as described in Unexamined-Japanese-Patent No. 2001-164861 is developed.
The earth auger has a screw head having a plurality of bits attached to the tip of an auger screw, and digs the ground while excavating the ground with the screw head.

However, when the screw head at the tip has a large diameter from the most advanced portion as in the idea described in the publication, a large force (power) is required to rotate and drill this.
When a motor or the like is enlarged in order to obtain a large output, the entire apparatus becomes large, and there are problems such as generation of a large noise.
JP 2001-164861 A

  The problem to be solved is that a large output is required for excavation by the head at the tip of the earth auger, and the excavability is not good.

The tip drilling head of the earth auger according to this device is
A first excavation part to which a plurality of excavation bits at the most advanced part are attached;
The second excavation part has a diameter larger than that of the first excavation part and includes a plurality of excavation bits at the peripheral edge of the spiral excavation blade.
In addition, the tip head of other earth augers
The spiral excavation blade of the second excavation part has a peripheral edge that gradually increases away from the center of rotation.

The present invention has the above-described configuration and achieves at least one of the following effects.
<a> The tip excavation head is composed of a first excavation part and a second excavation part having a larger diameter. The first excavation part excavates a small-diameter hole first, and then the second excavation part uses the second excavation part. Since the hole is formed by excavating in two stages so as to cut the hole wall, a large output for rotation is not necessary.
Therefore, the apparatus does not become large, and there is no worry about the generation of loud noises.
<B> Since the second excavation part is a spiral excavation blade, it is easy to enter the ground with rotation,
Good excavability can be obtained with smaller output.
<C> The spiral excavation blade of the second excavation part gradually advances away from the center due to the rotation, and thus proceeds so as to gradually scrape off the hole wall, and the output of the excavation is smaller. Good digging performance can be obtained even with an object.

  The tip excavation head of an earth auger according to the present invention comprises a first excavation portion having a small diameter and a second excavation portion having a larger diameter.

<1> Overall Configuration of the Earth Auger Excavator The earth auger excavator 1 has a rail 3 attached along a post 2 standing up and down, and a motor 4 moves up and down along the rail 3.
An auger screw 5 is attached so that it can be rotationally driven by a motor 4, and an excavation head A according to the present invention is attached to the tip (lower end) of the auger screw 5.

<2> Excavation Head The excavation head A is composed of a first excavation part 6 and a second excavation part 7.

<3> 1st excavation part The 1st excavation part 6 is provided in the front-end | tip part of the excavation axis | shaft 11, and has a diameter D2 smaller than the diameter D1 of the drilling hole B to be excavated.
A plurality of tip bits 8 are attached to the tip of the first excavation part 6.
The bit 8 is made of tungsten and has a bullet shape so that the tip can withstand abrasion, and is fitted into a hole formed in the head A.

<4> Second Excavation Unit The second excavation unit 7 has a helical excavation blade 9 on the outer periphery of the excavation shaft 11.
A plurality of cutting bits 10 are provided on the peripheral edge of the excavating blade 9.
The peripheral edge of the excavating blade 9 is gradually separated from the rotation center of the auger from the tip (lower end), and finally is separated by a half (radius) of the diameter D1 of the drilling hole B.
The cutting bit 10 is fitted into a hole formed in the peripheral edge portion of the excavating blade 9 at an appropriate interval and height.
The tip of the bit 10 slightly protrudes outward from the peripheral edge of the excavating blade 9.
As shown in FIGS. 3 and 4, the bit 10 and the next bit 10 are spaced apart by a height h.
In the embodiment, the bits 10 are arranged apart from each other in the axial direction by 10 cm.
The second excavating part 7 gradually increases the diameter D2 of the drilling hole B excavated by the first excavating part 6 by the bit 10 at the peripheral edge of the excavating blade 9, and finally cuts the diameter D1. The hole B is excavated.

<5> Excavation work The motor 4 of the auger excavator 1 is rotated to advance the tip excavation head A toward the ground.
First, the tip bit 8 of the first excavation part 6 excavates a drilling hole B having a small diameter D2 in the ground, and the subsequent cutting bit 10 of the excavation blade 9 of the second excavation part 7 gradually reduces the diameter so as to scrape the hole wall. Drilling the drilling hole B while expanding.
Following the excavation head A, the auger screw 5 enters the drilling hole B having a predetermined diameter D1.

In the illustrated embodiment, one spiral excavation blade 9 is attached to the outer periphery of the excavation shaft 11, but another spiral blade may be provided between the excavation blades 9 that are spiral. .
Actually, it is effective for providing a balance at the time of excavation that three spiral blades are provided around the excavation shaft so as to be inserted between each other.

Drilling head perspective view Bottom view of drilling head Top view showing bit placement Side view showing bit height position Overall configuration diagram of earth auger excavator

Explanation of symbols

A Drilling head B Drilling hole 1 Earth auger excavator 2 Post 3 Rail 4 Motor 5 Auger screw 6 First excavation part 7 Second excavation part 8 Tip bit 9 Excavation blade 10 Cutting bit

Claims (2)

A first excavation part to which a plurality of excavation bits at the most advanced part are attached;
A tip excavation head of an earth auger comprising a second excavation portion having a diameter larger than that of the first excavation portion and having a plurality of excavation bits on a peripheral portion of a spiral excavation blade.   The tip excavation head of the earth auger according to claim 1, wherein the spiral excavation blade of the second excavation part has a peripheral edge portion that gradually increases from the center of rotation.

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