JP3046278B2 - Earth auger with a leader inside the screw - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of an earth auger used for an apparatus for excavating a vertical hole in a civil engineering work for building a building or improving a ground.

[0002]

2. Description of the Related Art As a conventional excavator for excavating a vertical hole, there is known a type of excavator which excavates by lowering a boom of an earth auger attached to a boom that moves up and down. An excavator of the type described above is as shown in FIG. 5, in which a swingable and extendable second boom c is inserted into a working machine b fixed to the ground or the like by a fixing member a. A first boom d is provided, and a rotary drive motor e is attached to a fulcrum z at the tip of the second boom c. Rotary drive motor
An earth auger f is connected to the rotating shaft of e, and the earth auger f is a drilling blade g composed of spiral blades and a cutting cone at the tip.
h, and excavates when the boom d descends.

[0003] As another conventional excavator for excavating a vertical hole, a type of excavating a vertical hole by installing a leader for guiding an auger screw in a vertical direction is known. The machine is as shown in FIG. In FIG. 6, an arm cylinder j and a torque arm k are provided above and below a boom d of a working machine b, respectively, in order to vertically install a reader i. And the reader i is provided with a slide base l which can slide up and down,
A motor n for rotating and driving the auger screw is provided on the slide base l, and the excavating blade g of the auger screw is positioned by the screw guide p provided at the lower end while rotating and descends, thereby turning on the ground. A vertical hole is excavated by the excavating blade g of the screw and the cutting cone h at the tip.

[0004]

In the above-mentioned conventional excavator, a type in which an earth auger attached to a vertically moving boom is excavated by lowering the boom always maintains the earth auger f vertically. Therefore, when the first boom d rotates and descends, the second boom c is shortened as shown by the symbols (B) → (C) → (D) in FIG. Control has to be performed, and this control requires skill and has a problem in that work efficiency is poor.

In addition, as shown in FIG. 7, in the above-mentioned type of excavator, the fulcrum z of the rotary drive motor e can operate only in the range of the hatched portion (A), and the first boom d Second
Although the maximum length of the boom c is considerably high as Hmax, there is a problem that the maximum length is Ymax, which is much lower than the maximum value Hmax, and the work efficiency is low. That is, since the earth auger f must always be vertical, when the first boom d rotates and descends near the ground surface (B), the second boom c is reduced to the minimum, but the boom rotation center X =
0, the minimum value of the distance from Y = Ymin is Xmin, and cannot be less than this. Further, the maximum value of the height of the fulcrum z of the rotary drive motor e is the second boom in the first boom d.
By extending c to the maximum, it becomes the position Ymax intersecting with the vertical line of the distance Xmin, and cannot be further increased.

[0006] Also, the reader i described above with reference to FIG.
For drilling a vertical hole by installing a
There was a problem that it took time to set up. That is, in order to install the leader i, it is necessary to adjust the arm cylinder j and the torque arm k on the upper and lower sides of the boom d of the work machine b to adjust the leader i vertically, and also to set the auger screw vertically. Because there is. The present invention has been made in view of the above problems, the problem is, without installing a leader for the screw for the auger, and can fully utilize the height of the boom and cylinder of the working machine, Another object of the present invention is to provide an earth auger that can easily and easily perform excavation work by installing an earth auger in a construction site in a short time.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, an invention according to a first aspect of the present invention is directed to an earth auger of an excavator for excavating a vertical hole, wherein a leader directly connected to a drive source for driving and rotating a screw. the provided, provided with a cylinder member for raising and lowering the screw in the interior of the leaders, provided a slide mechanism which is slidable in but transmits rotation vertically the screw and the reader, the
The slide mechanism is hydraulically serialized via a rotary swivel.
An earth auger that controls the under member and moves only the screw portion without moving the drive source. And since the operation can almost fix the drive source without separately installing the leader for the auger screw, the height of the boom and cylinder of the working machine can be set freely,
In addition, the earth auger can be installed easily and in a short time at the construction site, and excavation work can be easily performed.

In order to solve the above-mentioned problem, the invention according to claim 2 is characterized in that a leader in which the slide mechanism is directly connected to a driving source is a polygonal column, and a screw fitted into the polygonal column is a screw. It is an earth auger provided with an opening. The operation of the slide mechanism can be made simple and robust in addition to the operation of the first aspect of the present invention.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, an embodiment of an earth auger having a leader disposed inside a screw suitable for the present invention will be described. FIGS. 1 and 2 show a case where a leader is disposed inside the screw. FIG. 3 and FIG. 4 are views showing a main part of a slide mechanism between a screw and a leader according to the present embodiment. First, FIG. 1 and FIG. The outline of the present embodiment will be described with reference to FIG.

In FIG. 1, a rotary drive motor 11 as a drive source is mounted on the upper part of the earth auger 1, and a motor casing 1 is provided at a fulcrum 211 of a suspending member 21 of the move 2.
Attached via eleven fulcrums 112. Then, the screw 12 of the earth auger 1 is driven via a coupling 13 from a rotating shaft 112 (FIG. 3) of the motor 11. The screw 12 is composed of a cylindrical long hollow tube 121,
An excavating blade 122 composed of a spiral blade and a cutting cone 123 at the lower end of the hollow tube 121 are fixed to the outer periphery. Move 2
Is controlled to be rotatable up, down, left and right by a command of a work machine 23 fixed on the ground by the fixing member 22, and the boom 2 includes a first boom 24, a second boom 25, and a third boom 25, The height (length) of the boom 2 which is configured to be telescopic
Is controlled by a command from the work machine 23. Therefore, the position and height of the fulcrum 211 of the suspension member 21 of the rotary drive motor 11 on the ground can be freely set. In addition, the first boom 24
Supplied from a rotary swivel 3 to be described later
Fixing members 27 and 28 for fixing the discharge pipes 31 and 32 are provided to prevent the rotation of the rotary swivel 3, and a hanging member 27 is provided at the tip of the third boom to be used for work using a crane. . Although the earth auger 1 of the present embodiment itself moves up and down without using a fixed reader, the drive shaft 131 from the coupling 13 has a hollow rectangular prism fixed to the lower flange 14 thereof. The leader 132 is connected. The square pillar reader 132 and the screw 12 are free to move in the vertical direction by a slide mechanism, but are restricted in the rotation direction, and the screw 12 also rotates according to the rotation of the square pillar reader 132, which will be described later with reference to FIG. Details will be described.

FIG. 2 shows a state in which the screw 12 is pressurized downward and descends to excavate a vertical hole, but the screw 12 slides down and slides on the rotating square column leader 132. However, the control of this descent is performed by the drive shaft 131 from the coupling 13 and the hollow square pillar reader 132.
The rotation is performed by the hydraulic pressure supplied from the rotary swivel 3 provided therebetween, but the rotary swivel 3 itself does not rotate. Further, this rotary swivel 3 is
The hydraulic pressure is controlled from the supply / discharge pipes 31 and 32 in accordance with the command from.

Next, a sliding mechanism of the rotating square pillar reader 132 and the screw 12 will be described with reference to FIGS. 3 and 4. FIG. 3 and 4, the rotary swivel 3 is fixed to a rotating drive shaft 131 by supply / discharge pipes 31 and 32 (in this case, the rotary swivel 3 is fixed to a supply / discharge pipe fixed by a fixing member 27). Although rotation is prevented by 31, 32, other appropriate fixing means may be used,
For example, the rotary swivel 3
A fixing member for fixing the rotary swivel 3 may be separately provided. In short, it is only necessary to have a means for preventing the rotation of the rotary swivel 3. ). A space between the drive shaft 131 and the rotary swivel 3 is sealed by a mechanical seal or a sealing member 4 such as an O-ring.
Annular annular grooves 311, 32 around the drive shaft 131 communicating with 31, 32
1 is provided, while a communication hole 13 provided on the drive shaft 131 side is provided.
3,134, even if the drive shaft 131 rotates, the communication holes 133,13
4 communicates with the supply / discharge pipes 31 and 32.

A small-diameter hollow shaft 135 is provided on the concentric shaft of the rotary drive shaft 131, and is connected to the communication hole 133.
136 is provided and communicates with the communication hole 134 to form a double hollow tube. A piston 137 is fixed to the lower end of the small-diameter hollow shaft 135, and an opening 138 on the lower surface of the piston 137 is provided.
, A small-diameter hollow shaft 135 is opened, and a large-diameter hollow shaft 136 is opened at an opening 139 on the upper surface of the piston 137. That is, in addition to the hollow square pillar reader 132 described above, a small-diameter hollow shaft 135 and a piston 137, and a large-diameter hollow shaft
136 is fixed.

On the other hand, the screw 12 slides up and down the hollow square pillar reader 132, but the hollow tube 1 of the screw 12
The upper end opening 5 of the upper part 21 is provided with a flange 51 for firmly fixing the square pillar reader 132 to the outside.
A rectangular hollow opening 52 for fitting the square column leader 132 is provided inside of the box. The hollow opening 52 also rotates as the square column reader 132 rotates.

The cutting cone 123 at the lower end of the hollow tube 121 of the screw 12 is fixed.
Cylinder member 53 that slides and fits with 36 and piston 137
Is fixed. A cylinder chamber 531 is provided in the inner diameter of the cylinder member 53, a first cylinder chamber 532 is provided between the piston 137 and the lower surface of the piston 137, and a second cylinder chamber 532 is provided between the piston 137 and the upper surface of the piston 137. A cylinder chamber 533 is provided, and the inner wall of the cylinder chamber 531 and the piston 13 are provided.
Sealing members 4 such as mechanical seals and O-rings
Sealed with one. The upper part of the cylinder chamber 531 is
The cylinder head 534 of the cylinder member 53 that slides and fits with the large-diameter hollow shaft 136 is also sealed with a sealing member 42 such as a mechanical seal or an O-ring.

[Operation] First, the screw 12 is rotated
The operation of the slide mechanism descending with respect to 1 will be described. When the hydraulic pressure is supplied from the supply / discharge pipe 31, the pressure is increased in the direction of arrow a, and the small-diameter hollow shaft 135 is rotated via the rotary swivel 3.
, The hydraulic pressure is supplied from the opening 138 on the lower surface of the piston 137, the capacity of the first cylinder chamber 532 increases, and as a result, the lower surface of the first cylinder chamber 531, that is, the cylinder member 53 is pushed down. At this time, the oil in the second cylinder chamber 533 is supplied from the large diameter hollow shaft 136 through the opening 139 to the rotary swivel 3.
Through the supply / discharge pipe 32 in the direction of arrow d.
While the oil pressure is continuously supplied from the supply / discharge pipe 31 described above, the screw 12 continues to descend along the square pillar reader 132 rotated by the rotation drive shaft 131, but the rotation of the rotation drive shaft 131 also continues to rotate. Since the square hollow opening 52 fixed to the screw 12 also rotates according to the rotation of the square column leader 132, the screw 12 also rotates and continues excavation.

Then, the excavation operation is completed, and the screw 12
The raising operation is the reverse of the lowering operation, but hydraulic pressure is supplied from the supply / discharge pipe 32, pressurized in the direction of arrow b, and the piston 137 is moved through the large-diameter hollow shaft 136 through the rotary swivel 3. Hydraulic pressure is supplied from the opening 139 on the upper surface, and the capacity of the second cylinder chamber 533 increases, and as a result, the upper surface of the second cylinder chamber 533, that is, the cylinder member 53 is pushed up. At this time, the oil in the first cylinder chamber 532 is discharged from the small-diameter hollow shaft 135 from the opening 138 via the rotary swivel 3 in the direction of arrow c from the supply / discharge pipe 32. At this time, the screw 12 may be stopped and raised during normal excavation work, or may be gradually raised while rotating in the reverse direction in the consolidation method. Therefore, the earth auger of the present embodiment does not require a separate installation of a leader for the auger screw, and fixes the position of the motor, so that the height of the boom and cylinder of the working machine is almost different from the conventional one. It can be set freely, and the earth auger can be installed easily and quickly on the construction site.
Excavation work can be performed easily.

Further, in the slide mechanism of the present embodiment, the leader directly connected to the driving source is a square pillar, and the screw has a hollow opening to be fitted into the square pillar. Therefore, the slide mechanism can be made simple and robust. It can withstand severe conditions such as excavation work and is easy to maintain.

It is needless to say that the present invention is not limited to the above-described embodiment unless the characteristics of the present invention are impaired. For example, the reader 132 is a hollow quadrangular prism. A polygonal column such as a triangular column or a pentagonal column may be used, and processing may be complicated, but a spline-shaped column may be used. Further, the square hollow opening 52 into which the leader 132 on the screw 12 side is fitted may be adjusted to the shape of the leader. Further, the hollow opening 52 may be provided not only on the upper portion of the screw 12 but also on the entire vertical surface of the screw inner circumference. Further, in the present embodiment, the supply of the hydraulic pressure to the upper and lower surfaces of the piston in the cylinder member is made to be a double hollow tube. Is also good.

[0020]

As described above, according to the first aspect of the present invention, an earth auger of an excavator for excavating a vertical hole is provided with a leader directly connected to a driving source for driving and rotating a screw. A cylinder member for raising and lowering the screw is provided inside the cylinder, and a slide mechanism that transmits rotation between the screw and the leader but is slidable in the vertical direction is provided .
Hydraulic control of cylinder members via tally swivel
And, since the drive source is an auger which only the screw part without moving up and down, without separately installing a reader for screw auger, since the drive source can be almost fixed, the working machine boom and cylinder The height of the ground auger can be set freely, and the earth auger can be installed easily and in a short time at the construction site, so that the excavation work can be easily performed.

According to the second aspect of the present invention, the ground auger has a polygonal column as the leader whose slide mechanism is directly connected to the driving source, and the screw has a hollow opening fitted into the polygonal column. Therefore, the effect that the slide mechanism can be made simple and robust can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing an earth auger in which a leader is provided inside a screw according to an embodiment of the present invention, which is attached to an excavator.

FIG. 2 is an explanatory diagram showing an operation when a screw descends along a leader that rotates as a driving shaft in FIG. 1;

3 (a) is a longitudinal sectional view showing details of a slide mechanism of a screw and a leader according to an embodiment of the present invention, and FIG. 3 (b) is an AA of FIG. 3 (a). FIG.

FIG. 4 is a perspective view showing details of a slide mechanism between a screw and a leader according to the embodiment of the present invention.

FIG. 5 is an explanatory view schematically showing a conventional excavator using an earth auger attached to a vertically moving boom.

FIG. 6 is an explanatory view schematically showing another conventional excavator in which a leader for vertically guiding an auger screw is installed to excavate a vertical hole.

FIG. 7 is an explanatory view showing the operation of the excavator using the conventional earth auger of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Earth auger 11 ... Rotation drive motor 111 ... Motor casing 12 ... Screw 121 ... Hollow tube 122 ... Drilling blade 123 ... Cutting cone 13 ... Coupling 131 ... Drive shaft 132 ... Square pillar leader 133,134 ... Communication hole 135 ... Small diameter hollow Shaft 136… Large hollow shaft 137… Piston 138,139… Opening 14… Flange 2… Move 21… Suspension member 211… Support point 22… Fixing member 23… Work machine 24… First boom 25… Second boom 26… Third boom 27 ... Fixing member for supply / discharge tube 3 ... Rotary swivel 31,32 ... Supply / discharge tube 311,321 ... Circular groove 4,41,42 ... Sealing member 5 ... Opening of upper end of hollow tube 121 51 ... Flange 52 ... Hollow opening 53 ... Cylinder member 531 ... Cylinder chamber 532 ... First cylinder chamber 533 ... Second cylinder chamber 534 ... Cylinder head

Claims (2)

(57) [Claims] 1. A auger drilling machine for drilling a vertical hole, the reader directly connected to a drive source for rotationally driving the screw is provided, together with the inside of the leaders providing cylinder member for raising and lowering the screw, A screw and a leader are provided with a slide mechanism that transmits rotation but is slidable in the vertical direction .
Controls cylinder members hydraulically via tally swivel
And, driving source auger which is disposed a reader inside the screw, characterized in that only the screw part without moving up and down. 2. The slide mechanism according to claim 1, wherein the leader directly connected to the driving source is a polygonal column, and the screw is provided with a hollow opening to be fitted in the polygonal column. Earth auger.