JPH0658069A - Auger head for excavating machine - Google Patents

Abstract

PURPOSE:To prevent sideways swing by installing excavating edges at the bottom surface of an auger head in a specific position on a track, and forming the shaft tip tapered. CONSTITUTION:Excavating edges 5 at the bottom surface of an auger head are located on a spiral track viewed from the bottom surface. The length from the center of the auger head shaft 3 to the outer side face 16 of one excavating edge 5 is made equal to or greater than the length to the inner side face 17 of other excavating edge 5 arranged outside of the first named excavating edge 5. The tip of the shaft 3 is tapered as thining toward the bottom. Therewith the whole surface is excavated without generating such a phenomenon that the excavating edge 5 excavates the same circumference as other excavating edge 5 positioned ahead the first named in the rotational direction or that any non-excavation part is left. Further because there is no unpredictable reactive force from the earth, approx. evenly earth reactive force is applied to a screw blade piece 2, and intrusion into the earth is facilitated with the taper on the shaft 3, and also the exhaust earth is carried out smoothly. This prevents sideways swing and bottom walk and allows omitting the advance course correcting operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auger head for an excavator used for forming a vertical hole on the ground by providing a plurality of screw blade pieces.

[0002]

2. Description of the Related Art An auger head 1 of a screw auger used in a conventional excavator has a screw blade 2 formed in a spiral shape even if there are differences in winding intervals, thicknesses, widths, etc. No regularity was found in the arrangement of the digging blades 5 provided at the ends of the winglets 2.

Therefore, a non-uniform reaction force acts on each screw blade piece 2 through the irregularly arranged excavating blades 5, which causes a drawback that the auger head 1 laterally shakes. However, among the conventional examples, like the auger head 1 shown in FIGS. 1 and 2, there are also those in which the excavating blade 5 is arranged on the spiral orbit when viewed from the bottom surface of the auger head 1. Since no regularity was found in the intervals of the excavating blades 5 arranged above, there was a gap that was not excavated on the excavation surface formed by one rotation of the auger head 1.

Therefore, even in the conventional example shown in FIGS. 1 and 2, the outer surface 1 of each excavating blade 5 is removed from the soil in the gap that is not excavated.
Unexpected reaction force acts on 6 and the inner side surface 17, and the defect that the auger head 1 laterally shakes has not been solved. This is especially noticeable when hard rock or the like is present in the excavated soil, and so-called bottom walking may occur due to side thrust.

Therefore, the worker keeps the excavation track constant,
Often, extra work was required to stabilize the Earth Auger, and work efficiency tended to deteriorate naturally.

[0006]

Therefore, according to the present invention, the excavation function of the auger head 1 and the excavation function of the auger head 1 are improved by improving the arrangement of the excavating blade 5 provided on the screw blade end portion 4 and the shape of the auger head shaft 3. The present invention aims to improve the efficiency of excavation work by providing an auger head 1 that can maintain stable soil function and can perform stable excavation work without lateral shake.

[0007]

According to the present invention, in the auger head 1 in which the excavating blades 5 are provided at intervals from the outer end of each screw blade piece end portion 4 in the axial direction, viewed from the bottom surface of the auger head 1. The excavation blade 5 is arranged on the spiral orbit, and the length from the center of the auger head shaft 3 to the outer side surface 16 of the one excavation blade 5 is equal to that of the other excavation blades arranged outside the excavation blade 5. It is configured as an auger head 1 having a length of at least the inner surface 17 of the blade 5.

The length from the center of the auger head shaft 3 to the outer side surface 16 of one excavating blade 5 is the same as the length to the inner side surface 17 of another excavating blade 5 arranged outside the excavating blade 5. The same auger heads 1 are configured. Furthermore,
The auger head shaft 3 is configured as the auger head in which the shape of the auger head shaft 3 is tapered in a downward direction.

[0009]

The present invention has the following effects because it employs the above-mentioned means. In the present invention, unlike the case of the conventional auger head 1, one excavating blade 5 rotates and excavates on the same circumference as another excavating blade 5 located forward in the rotation direction,
The entire excavation surface is excavated by one rotation of the auger head 1 without causing a gap that is not excavated by the excavation blade 5 on the excavation surface.

Further, in the present invention, since the excavating blades 5 are arranged from the outer end of the screw blade piece end portion 4 to the auger head shaft 3 without leaving a gap, each excavating blade 5 is removed from the soil in the gap which is not excavated. An unexpected reaction force does not act on the outer side surface 16 and the inner side surface 17, and a substantially uniform reaction force from the soil acts on each screw blade piece 2, so that the conventional auger head 1
It does not cause so-called bottom walking, which is often the case with the side thrust.

Further, in the present invention, since the shape of the auger head shaft 3 around which the screw blade 2 is wound is formed in a taper shape in which the lower direction is narrowed, the auger head shaft 3 can easily enter the soil. In addition, the soil excavated by the excavating blade 5 also smoothly rides on the screw blade 2 and is conveyed to the upper portion without resistance and discharged. Therefore, as a result of the arrangement of the excavating blade 5 and the shape of the auger head shaft 3 being configured in this way, the auger head 1 that can stably perform excavation work without lateral shake is provided, and the operator can re-examine the excavation course. There is no need to perform the correction work of

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a conventional auger head 1, and FIG. 2 is a bottom view thereof. In this conventional example, two sets of screw blade pieces 2 are wound around an auger head shaft 3, and the drilling blades 5 at the screw blade end portions 4 are arranged on a spiral orbit when viewed from the bottom surface of the auger head 1. However, there is no regularity in the intervals between the drilling blades 5, and the auger head 1
There was a gap that was not excavated on the excavation surface formed by one rotation.

FIG. 3 is a side view of an excavator 6 in which the auger head 1 of the present invention is used. The excavator 6 according to this embodiment includes a leader 8 standing upright in front of a pile driver 7.
The shaft rotation drive device 9 is attached to the upper part of the above, and the auger shaft 11 of the screw auger 10 is attached to the shaft rotation drive device 9. And that screw auger 1
0 itself, as shown in the figure, is composed of a rod portion 12, a stirring and conveying portion 13, and an auger head 1 according to the present invention.
A swing stop device 14 for supporting the screw auger 10 in parallel with the leader 8 is provided in the middle and lower part of the leader 8.

Although the excavator 6 of this embodiment is a single-screw excavator, it is needless to say that the present invention can be applied to a multi-screw excavator 6 as well, and the rod portion 12 and the agitation / transfer portion. 1
3, and the composition ratio of the auger head 1 to the entire screw auger 10 is not limited to that shown in FIG. 3, and it goes without saying that the composition ratio can be changed depending on the geology of the excavated site, the presence or absence of bedrock, and the like.

FIG. 4 is a bottom view showing the auger head 1 of the embodiment of the present invention, and FIG. 5 is a side view showing the auger head 1 of the embodiment of the present invention. In the auger head 1 of this embodiment, a cement milk ejection port 15 is provided at the center of a taper-shaped auger head shaft 3 having a tapered lower portion, and three screw blades 2 are wound around the cement milk ejection port 15. The drill blade 5 provided on the screw blade tip end portion 4 is arranged on a spiral orbit when viewed from the bottom surface of the auger head 1, and is located outside the one drill blade 5 from the center of the auger head shaft 3. The length to the side surface 16 is set to be equal to or more than the length to the inner side surface 17 of another excavating blade 5 arranged outside the excavating blade 5.

Therefore, in the auger head 1 of this embodiment, one of the excavating blades 5 is the same as the other excavating blade 5 located forward in the rotational direction, except for the three excavating blades 5 provided at the outermost end. There is no need to rotate or excavate on the circumference, the excavating blade 5 always rotates and descends while shaving unexcavated soil, and furthermore, one revolution of the auger head 1 excavates the entire excavated surface without a gap. Has become.

Therefore, in this embodiment, like the conventional example,
Unexpected reaction force does not act on each excavating blade 5 from the soil in the gap that is not excavated by the excavating blade 5, and the triple screw wing pieces 2 provided in parallel do not move from the soil substantially uniform through the excavating blade 5. Since the reaction force acts, it becomes possible to prevent so-called bottom walking due to the side thrust, which is apt to occur in the conventional auger head 1.

It should be noted that three digging blades 5 are provided on the same circumference at the outermost end of each screw blade end portion 4 of this embodiment. This is the outermost end of the screw blade end portion 4. Since the reaction force from the soil is the strongest, the durability of the excavating function of the auger head 1 is taken into consideration, and the excavation piece 5 does not necessarily have to be provided at all the outermost ends of each screw blade piece. Can be carried out.

Further, the auger head shaft 3 of this embodiment is
The cross section is formed by stacking three circles so that the center points of the respective circles are equilateral triangles, and the whole is tapered downward. As shown in FIG. 6, this is a stirring and transferring section 13 of a screw auger in which this embodiment is used.
This is because the cross-section of the auger shaft 11 has the above-described shape, that is, the shape in which three circles are stacked so that the center points of the respective circles are equilateral triangles. This is due to consideration of maintaining the approach speed of the screw auger and transferring soil upward.

Therefore, the auger shaft 11 of the stirring and transferring section 13
When the auger head shaft 3 has a normal cylindrical shape, the auger head shaft 3 of the present invention may have a conical shape corresponding to the shape of the auger shaft 11. FIG. 6 is a partially cutaway perspective view showing a stirring and transferring section 13 of a screw auger in which the auger head 1 according to the embodiment of the present invention is used.

As described above, the cross section of the auger shaft 11 of the stirring and transferring section 13 of the screw auger in which this embodiment is used has three circles so that the center points of the respective circles are equilateral triangles. The auger shaft 11 has a stacked shape, and the auger shaft longest point 19 of the protruding portion 18 and the outer edge 20 of the screw blade piece 2 overlap each other.

This is because in the conventional screw auger, the soil discharged on the upper surface of the screw wing piece 2 and only carried to the ground is discharged from the concave groove 21 of the auger shaft 11 to the protruding portion 18.
In the vicinity of the longest point 19 of the auger shaft where the outer edge 20 of the screw blade piece 2 and the end of the protruding portion 18 overlap with each other while being gradually sandwiched between the curved protruding portion 18 and the hole wall surface in the process of heading, This is because part of the soil that should be discharged becomes part of the wall surface of the hole, which prevents natural collapse of the wall surface of the hole.

Therefore, according to the embodiment of the present invention, the stirring and transferring section 1 is used.
Since the shape of the auger shaft 11 itself does not depend on the shape of the auger shaft 11, the auger head 1 of the present invention can be implemented even if the shape of the auger shaft 11 is cylindrical or polygonal.

[0024]

According to the present invention, the arrangement of the excavating blade 5 is on the spiral orbit when viewed from the bottom surface of the auger head 1, and the length from the center of the auger head shaft 3 to the outer side surface 16 of one excavating blade 5 is By setting the length to the inner side surface 17 of another excavating blade 5 arranged outside the excavating blade 5 or more, the lateral runout and the lateral thrust of the auger head 1 which are apt to occur in the conventional auger head. It is possible to prevent so-called bottom walking due to.

Therefore, according to the present invention, the operator can be provided with the auger head 1 which can stably perform the excavation work without lateral shake, and the excavation work need not be corrected again. It is possible to improve the efficiency of.

[Brief description of drawings]

FIG. 1 is a side view showing a conventional auger head.

FIG. 2 is a bottom view showing a conventional auger head.

FIG. 3 is a side view of an excavator in which the auger head of the present invention is used.

FIG. 4 is a bottom view showing the auger head of the embodiment of the present invention.

FIG. 5 is a side view showing the auger head of the embodiment of the invention.

FIG. 6 is a partially cutaway perspective view showing an agitating and transferring section according to an embodiment of the present invention.

[Explanation of Codes] 1 Auger head 2 Screw blade piece 3 Auger head shaft 4 Screw blade end portion 5 Excavator blade 6 Excavator 7 Pile driver 8 Reader 9 Shaft rotation drive device 10 Auger shaft 11 Auger shaft 12 Rod portion 13 Stirring transfer Part 14 Anti-vibration device 15 Cement milk spout 16 Outer surface 17 Inner surface 18 Projection 19 Auger shaft longest point 20 Outer edge 21 Cavity

Claims (3)

[Claims] 1. An auger head (1) provided with axially spaced drilling blades (5) from the outer end of each screw blade end (4), viewed from the bottom of the auger head (1). The excavating blade (5) is arranged on the spiral orbit, and the length from the center of the auger head shaft (3) to the outer surface (16) of the one excavating blade (5) is the excavating blade (5). ), The inner surface (1) of another drilling blade (5) arranged outside
An auger head for an excavator characterized by having a length up to 7). 2. The length from the center of the auger head shaft (3) to the outer surface (16) of one of the excavating blades (5) is the other excavating blade (5) arranged outside the excavating blade (5). The auger head for an excavator according to claim 1, wherein the length is equal to the inner surface (17) of (5). 3. The auger head for an excavator according to claim 1 or 2, wherein the shape of the auger head shaft (3) is a taper shape in which a downward direction is narrowed.