JP3031447B2 - Bucket mounting adapter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for connecting a bucket to a tip of a kerry such as an earth drill when a drill is attached to the tip of the kerry so that the kerry is rotated. The present invention relates to a bucket mounting adapter.

[0002]

2. Description of the Related Art FIG. 5 is a side view showing a state in which a bucket for excavation is attached to the tip of an earth drill kerber using a conventional adapter for attaching a bucket, and FIG. 6 is EE in FIG.
It is an expanded sectional view. As shown in FIG. 5, the adapter 1
When the size of the square shaft 2a at the tip of the kerry bar 2 and the size of the upper corner boss 3a of the bucket 3 are different and the kerry bar 2 and the bucket 3 cannot be directly connected, the kerry bar 2 and the bucket 3 are connected. It is used interposed between. The conventional adapter 1 has a square shaft 4 connected to the upper corner boss 3a of the bucket 3.
Is welded by fitting the upper end 4a thereof into the square hole 5a of the flange 5 and welding a square boss 6 to the upper surface of the flange 5 to be connected to the square shaft 2a at the tip of the screwdriver 2. The square shaft 4 has a rectangular cross section, and the square boss 3 of the bucket 3
The dimension is such that it can be removably inserted into the square hole 3b having a rectangular cross section a. As shown in FIG. 6, the square boss 6 has a structure in which four plate members 6a are fitted in a tubular shape and a corner portion 7 is welded, and a corner having a rectangular cross-section of the corner 2 is formed. The dimensions are such that the shaft 2a can be detachably fitted inside.

The adapter 1 and the screwdriver 2 are fitted with the square shaft 2a of the screwdriver 2 into the square boss 6 of the adapter 1 and the pin 8
Are connected by inserting. The adapter 1
The bucket 3 and the bucket 3 are connected by fitting the square shaft 4 of the adapter 1 into the upper corner boss 3 a of the bucket 3 and inserting the pin 9.

By interposing the adapter 1 between the kerry bar 2 and the bucket 3, the size of the square boss 3a of the bucket 3 is different from the size of the square shaft 2a of the kerry bar 2. In addition, the bucket 3 and the kerry bar 2 can be connected to each other, and the rotational torque given to the kerry bar 2 and the pushing force given as necessary are transmitted to the bucket 3 via the adapter 1. The excavation work is performed by the bucket 3.

[0005]

The conventional adapter 1 is:
Square boss 6 to which rotational torque is transmitted from the screwdriver 2
Are formed in a welded structure, and a square shaft 4 for transmitting the rotational torque to the bucket 3 is welded to the flange 5. The fatigue strength of these welds is caused by variations in welding conditions and occurrence of welding defects. Therefore, there is a problem that the conventional adapter 1 has low reliability in strength.

Further, in order to improve the strength of the welded portion, it is necessary that the welded portion has a longer welding leg length as continuous welding, and a welding bead is used to prevent stress concentration at the welded portion. It is necessary to finish the shape to a smooth shape with a grinder or the like, and there is a problem that productivity is low.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a bucket mounting adapter having high strength and high productivity.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a boss for excavation, which is interposed between a kerber for transmitting a rotational force to the bucket and a square boss on an upper portion of the bucket. A square shaft part to be inserted into the bracket, a square boss part into which the square shaft at the tip of the kerry is inserted, and a flange between the square shaft part and the square boss part. The square shaft portion is integrally formed on the lower surface of the flange, the square boss portion is integrally formed, and the square boss portion is welded to the upper surface of the flange.

In the present invention, it is preferable that a recess is formed on the upper surface of the flange, and the square boss portion is fitted into the recess and welded.

[0010]

In the bucket mounting adapter according to the present invention, since the square shaft portion is formed integrally with the flange, the rotating torque is transmitted from the flange to the square shaft portion without a welding portion, and the strength is improved. Further, since welding between the square shaft portion and the flange is eliminated, finishing of the weld bead becomes unnecessary. Further, since the square boss portion is formed integrally and welding of the corner portion of the square boss portion is eliminated, finishing work of the weld bead becomes unnecessary and strength is improved. Further, in the case where the flange and the square boss have a fitting structure, displacement of the flange and the square boss is prevented.

[0011]

FIG. 1 is a side view showing a state in which an excavating bucket is attached to the tip of an earth drill keriba using an embodiment of a bucket attaching adapter according to the present invention, and FIG. FIG. 3 is a side view, FIG. 3 is a plan view of the embodiment, and FIG. 4 is an exploded perspective view of the embodiment. As shown in FIGS. 1 to 4, the bucket mounting adapter 10 of this embodiment
1 and a flange 12 are integrally formed by forging or the like, and a square boss 13 integrally formed by forging or the like is welded to the upper surface of the flange 12.

The upper surface of the flange 12 is formed in a concave shape, the lower portion 13a of the square boss portion 13 is fitted into the concave portion 12a, and the outer peripheral portion is welded (14) to be integrated with the square boss portion 13. I have. The cross-sectional shape of the square shaft portion 11 and the cross-sectional shape of the square hole 13b of the square boss portion 13 are the same as those of the conventional adapter 1.
Similarly, the square boss 3a of the bucket 3 and the square hole 3b
Alternatively, the size is set such that it can be detachably fitted inside the square shaft 2a at the tip of the screwdriver 2. Here, 11a is a pin hole for connecting to the square boss 3a of the bucket 3, and 13c is a pin hole for connecting to the square shaft 2a of the kerry bar 2.

As shown in FIG. 1, the adapter 10 and the connector 2 are connected to each other by a pin hole 2a formed in a tip angle shaft 2a of the connector 2.
The connection between the adapter 10 and the bucket 3 is performed by inserting the pin 9 in the same manner as described above.

As described above, since the square shaft portion 11 and the flange 12 are integrally formed, the rotational torque transmitted from the kerber 2 is transmitted from the flange 12 to the square shaft portion 11 without a welding portion. be able to. Further, since the root portion 11b of the square shaft portion 11 can be formed by cutting, bead shape finishing is not required, which not only improves productivity but also reduces strength reliability due to welding defects. Can be prevented, and the fatigue strength is improved. Further, since the square boss portion 13 is formed integrally, a large amount of welding of the corner portion becomes unnecessary, and the productivity of the square boss portion 13 is improved, and there is no welding defect in the corner portion. Therefore, the fatigue strength can be improved.

Further, the flange 12 and the square boss 1
3 has a fitting structure, the flange 12 and the square boss 1
3, the outer periphery can be welded easily and reliably, and the connection between the flange 12 and the square boss 13 can be strengthened.

The adapter of the present invention can be applied to not only a general earth drill bucket for shaft drilling but also a bottom-expanding bucket for enlarging and excavating the bottom of a vertical hole and other buckets for excavating and storing earth and sand by rotation.

[0017]

According to the first aspect of the present invention, since the square shaft portion and the flange are formed integrally, the rotational torque transmitted from the kerber can be transmitted without passing through the welding portion. Is eliminated, there is no possibility that the fatigue strength is reduced by welding defects, and the reliability in strength can be improved. Further, since there is no welded portion between the square shaft portion and the flange, bead shape finishing is not required, which contributes to improvement in productivity. Also, since the square boss is formed integrally,
Not only does a large amount of welding at the corner become unnecessary, thus improving the productivity, but also improving the fatigue strength because there is no welding defect at the corner. From these facts, it is possible to provide an adapter with good productivity and high strength reliability.

According to the second aspect of the present invention, since the flange and the square boss are fitted to each other, misalignment between the flange and the square boss can be prevented, and the outer periphery can be welded easily and reliably. The bonding between the flange portion and the square boss portion can be strengthened.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which an excavating bucket is attached to the tip of a kheraver of an earth drill using an embodiment of a bucket attaching adapter according to the present invention.

FIG. 2 is a side view of the adapter of the embodiment.

FIG. 3 is a plan view of the adapter of the embodiment.

FIG. 4 is an exploded perspective view of the adapter of the embodiment.

FIG. 5 is a diagram illustrating a button drill of an earth drill using a conventional adapter.
It is a side view showing the state where the bucket for excavation was attached to the tip of a bar.

FIG. 6 is an enlarged sectional view taken along the line EE of FIG. 5;

[Explanation of symbols]

 2 Kerry bar 2a Square shaft 3 Bucket 3a Square boss 8, 9 pin 10 Bucket mounting adapter 11 Square shaft portion 12 Flange 12a Concave portion 13 Square boss portion 14 Welded portion

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E21B 11/00

Claims (2)

(57) [Claims] An angular shaft portion interposed between a kerber for transmitting torque to an excavating bucket and the bucket and inserted into a square boss on an upper portion of the bucket, and a corner of a tip of the kerber. In a bucket mounting adapter including a square boss into which a shaft is inserted, and a flange between the square shaft and the square boss, the square shaft is integrally formed on a lower surface of the flange. The square boss is formed integrally and the square boss is welded to the upper surface of the flange. 2. A bucket mounting adapter according to claim 1, wherein a concave portion is formed on the upper surface of said flange, and said square boss portion is fitted into said concave portion and welded.