JPH0742470A - Adapter for mounting bucket - Google Patents

Abstract

PURPOSE:To eliminate welding between a flange and an angular shaft and to promote productivity and fatigue strength by welding an angular boss formed as a unit to the upper surface of the flange, and forming the angular shaft in the lower surface of the flange as a unit. CONSTITUTION:The upper surface of a flange is formed in a recessed shape, the lower part 13a of an angular boss section 13 is fitted to a recess section 12a to weld the peripheral surface, and it is combined with the angular boss section 13. The lower surface of the flange 12 is combined with an angular shaft 11, and revolving torque transferred from a kelly bar 2 can be transferred to the angular shaft 11 from the flange 12 without requiring welding. The decline of strength by welding defects is prevented, and a great deal of welding made to a comer section of the angular boss section 13 is eliminated to promote fatigue strength. In addition, the flange 12 and angular boss section 13 have fitting construction to prevent misalignment between the flange 12 and angular boss section 13, and welding of the peripheral surface is easily and surely is made. According to the constitution, joint between the flange 12 and angular boss section 13 is firmly made and, at the same time, reliability can be promoted in comparison with a conventional method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for connecting a kerry bar and a bucket when excavating work by attaching a bucket to the tip of a kerry bar such as an earth drill and rotating the kerry bar. 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 the kerber of an earth drill by using a conventional bucket attachment adapter, and FIG.
It is an expanded sectional view. As shown in FIG. 5, the adapter 1
When the size of the angular shaft 2a at the tip of the kerry bar 2 and the size of the upper angular 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 to each other. Used by being interposed between The conventional adapter 1 has an angular shaft 4 to be connected to the upper angular boss 3a of the bucket 3.
Has an upper end 4a fitted into a square hole 5a of a flange 5 and welded, and an upper surface of the flange 5 is welded with a square boss 6 connected to a square shaft 2a at the tip of the key bar 2. The square shaft 4 has a rectangular cross section, and the square boss 3 of the bucket 3 is formed.
The size is such that it can be removably fitted into the square hole 3b having a rectangular cross section of a. As shown in FIG. 6, the square boss 6 has a structure in which four plate members 6a are aligned in a cylindrical shape and the corner portions 7 are welded to each other, and the corner boss 6 has a rectangular cross section. The shaft 2a is dimensioned so that it can be detachably fitted therein.

With respect to the adapter 1 and the cable 2, the angular shaft 2a of the cable 2 is fitted into the angular boss 6 of the adapter 1, and the pin 8 is inserted.
Are connected by inserting. Also, the adapter 1
The bucket 3 is connected to the bucket 3 by inserting the square shaft 4 of the adapter 1 into the upper square boss 3a of the bucket 3 and inserting the pin 9.

As described above, when the adapter 1 is interposed 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. Then, excavation work is performed by the bucket 3.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Square boss 6 to which the rotary torque from the key 2 is transmitted
Is a welded structure, and the square shaft 4 for transmitting the rotation torque to the bucket 3 is welded to the flange 5. The fatigue strength of these welded parts is such that the welding conditions vary and welding defects occur. Therefore, the conventional adapter 1 has a problem of low reliability in strength.

Further, in order to improve the strength of the welded portion, it is necessary to lengthen the welding leg length as continuous welding, and in order to prevent stress concentration at the welded portion, a weld bead is formed. There is a problem that productivity is low because it is necessary to finish the shape into a smooth shape with a grinder or the like.

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

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is interposed between a bucket for exchanging a rotational force to a bucket for excavation and the bucket, and an angular boss at the upper part of the bucket. In the bucket mounting adapter, which is composed of an angular shaft portion to be inserted into, an angular boss portion into which the angular shaft of the tip of the kerber is inserted, and a flange between the angular shaft portion and the angular boss portion, 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.

Further, in the present invention, it is preferable that a recess is formed on the upper surface of the flange, and the square boss is fitted in 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 rotational torque is transmitted from the flange to the square shaft portion without passing through the welded portion, and the strength is improved. Further, since the welding of the square shaft portion and the flange is abolished, the finishing process of the welding bead becomes unnecessary. Further, since the square boss portion is integrally formed and the welding of the corner portion of the square boss portion is eliminated, the finishing process of the weld bead is unnecessary and the strength is improved. Further, when the flange and the square boss portion are fitted with each other, the positional deviation between the flange and the square boss portion is prevented.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing a state in which an excavating bucket is attached to the tip of the kerber of an earth drill using an embodiment of the 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 according to the present embodiment includes a square shaft portion 1
1 and the flange 12 are integrally formed by forging or the like, and a square boss portion 13 integrally formed by forging or the like is welded to the upper surface of the flange 12.

The flange 12 has a concave upper surface, and 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. There is. The cross-sectional shape of the square shaft portion 11 and the square hole 13b of the square boss portion 13 are the same as those of the conventional adapter 1
Similarly, the square holes 3b of the square bosses 3a of the bucket 3
Alternatively, it is sized so that it can be detachably fitted into the angular shaft 2a at the tip of the key bar 2. Here, 11a is a pin hole for connecting with the square boss 3a of the bucket 3, and 13c is a pin hole for connecting with the square shaft 2a of the key bar 2.

As shown in FIG. 1, the adapter 10 and the kerber 2 are connected to each other by the pin hole 2 of the tip angular shaft 2a of the kerber 2.
The pin 8 is inserted by aligning b with the pin hole 13c, and similarly, the connection of the adapter 10 and the bucket 3 is performed by inserting the pin 9.

As described above, since the angular shaft portion 11 and the flange 12 are integrally formed, the rotational torque transmitted from the key bar 2 is transmitted from the flange 12 to the angular shaft portion 11 without a welded 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 reliability in strength due to welding defects. It can be prevented and fatigue strength is improved. Further, since the square boss portion 13 is integrally formed, a large amount of welding of the corner portion is not required, the productivity of the square boss portion 13 is improved, and there is no welding defect of the corner portion. Therefore, fatigue strength can be improved.

Further, the flange 12 and the square boss portion 1
Since 3 has a fitting structure, the flange 12 and the square boss 1
It is possible to prevent misalignment with 3 and to weld the outer periphery easily and surely, and to firmly bond the flange 12 and the square boss portion 13.

The adapter of the present invention can be applied not only to a general earth drill bucket for axial excavation but also to a bottom expanding bucket for expanding 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 angular shaft portion and the flange are integrally formed, the rotational torque transmitted from the kerry bar can be transmitted without passing through the welding portion, and the welding of this portion can be performed. Since the above is abolished, there is no fear that the fatigue strength will decrease due to 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 integrally formed,
Not only does a large amount of welding on the corner portion become unnecessary and productivity is improved, but also because there are no welding defects at the corner portion, fatigue strength can be improved. For these reasons, it is possible to provide an adapter with good productivity and high reliability in strength.

According to the second aspect of the present invention, since the flange and the square boss portion are fitted together, the misalignment between the flange and the square boss portion is prevented, and the outer periphery is easily and reliably welded. It is possible to strengthen the joint between the flange portion and the square boss portion.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which an excavation bucket is attached to the tip of a kerber of an earth drill using an embodiment of a bucket attachment 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] Button drill for ground drill using a conventional adapter
It is a side view showing the state where the bucket for excavation was attached to the tip of the bar.

6 is an enlarged EE sectional view of FIG.

[Explanation of symbols]

 2 Key bar 2a Square shaft 3 Bucket 3a Square boss 8, 9 pin 10 Bucket mounting adapter 11 Square shaft part 12 Flange 12a Recessed part 13 Square boss part 14 Welded part

Claims (2)

[Claims] 1. A corner shaft portion, which is interposed between a kerry bar for transmitting a rotational force to an excavating bucket and the bucket and is inserted into a square boss at the upper part of the bucket, and a corner of the tip of the kerry bar. A bucket mounting adapter comprising a square boss portion into which a shaft is inserted and a flange between the square shaft portion and the square boss portion, wherein the square shaft portion is integrally formed on a lower surface of the flange. The bucket mounting adapter, wherein the square boss portion is integrally formed, and the square boss portion is welded to an upper surface of the flange. 2. The bucket mounting adapter according to claim 1, wherein a concave portion is formed on an upper surface of the flange, and the square boss portion is internally fitted and welded in the concave portion.