JP5270595B2 - Bucket mounting adapter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adapter for mounting a bucket, high in durability. <P>SOLUTION: From a flange part 130 to the angle shaft part 111 in the adapter 100, the inner peripheral surface of a square hole 131 abuts on the side face of a rectangular shaft 111 of a first mounting part 110 to transmit the rotational force of a kelly-bar 7 to an excavation bucket 5. From the flange part 130 to the angle shaft part 111, since the surfaces thus abut on each other to transmit rotational force, durability is high, and large rotational force can be transmitted. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a bucket mounting adapter that is interposed between a bucket and a kelly bar that transmits a rotational force to a bucket for excavation.

  The bucket mounting adapter that is interposed between the bucket and the kelly bar that transmits the rotational force to the excavation bucket is inserted into the corner shaft boss that is inserted into the top corner boss of the bucket and the corner shaft at the tip of the kelly bar. With a corner boss. In a conventional adapter for attaching a bucket, a square shaft portion is joined by welding to a flange-like portion below the square boss portion. Therefore, the diameter of the bucket mounting adapter is suddenly changed above and below the portion where the angular shaft portion is welded to the flange-shaped portion. For this reason, stress is concentrated on the welded portion when the rotational force is transmitted to the bucket, so that there is a possibility that cracking or the like may occur in the welded portion while receiving repeated stress.

  Thus, in order to avoid cracking of the welded portion, a bucket mounting adapter is known in which the flange-shaped portion and the square shaft portion described above are integrally formed. In this bucket mounting adapter, a flange-shaped member formed integrally with a square shaft portion and a square boss portion are joined by welding (see Patent Document 1).

Japanese Patent Laid-Open No. 7-42470

  However, in the bucket mounting adapter described in the above-mentioned patent document, the diameter of the bucket mounting adapter still changes suddenly from the angular shaft portion to the flange-shaped portion. For this reason, when the rotational force is transmitted to the bucket, stress concentrates on the sudden change portion of the diameter, so that the fatigue strength of the sudden change portion of the diameter is lower than the fatigue strength of other portions.

(1) The adapter for attaching a bucket according to the invention of claim 1 is a bucket interposed between a bucket for excavation located below and a kelly bar located above the bucket for transmitting rotational force to the bucket. in mounting adapter, and a first attachment member having a square shaft portion to be inserted into the top corner bosses bucket, and a second attachment member having a corner boss square shaft of the tip of Keriba it is inserted, the second A member that is welded to and fixed to the mounting member of FIG. 1 and has a rectangular hole portion that has a cross section that is substantially the same shape as a rectangular cross section perpendicular to the axial direction of the square shaft portion, and the square shaft portion is The rotational force from the kelly bar transmitted through the second mounting member between the inner peripheral surface of the rectangular hole portion and the side surface of the rectangular shaft portion that are inserted along the direction and contact each other is the first mounting member. Rotational power transmission to And a member, the first mounting member, square shaft portion is inserted toward the top in a rectangular hole of the rotation transmitting member downward, rectangular upper part to prevent slipping out from the rectangular hole downward A restricting portion that has a retaining portion that has a larger cross-sectional shape than the sectional shape of the hole portion, and the second mounting member is disposed above the retaining portion and restricts the upward movement of the angular shaft portion. Have
( 2 ) The invention according to claim 2 is the bucket mounting adapter according to claim 1, wherein the angular shaft portion is defined by an interval between two opposing side surfaces of the four side surfaces of the angular shaft portion. The diameter of the portion is the same for the portion inserted into the upper corner boss of the bucket and the portion that contacts the inner peripheral surface of the rectangular hole.

  ADVANTAGE OF THE INVENTION According to this invention, durability of the adapter for bucket attachment can be improved.

It is a whole side view of the earth drill machine in which the adapter for bucket attachment by this invention is used. It is a figure which shows the longitudinal cross-section of the lower end vicinity of the Kelly bar 7. It is a figure which shows these longitudinal cross-sections in the state which isolate | separated the kelly bar 7, the adapter 100, and the excavation bucket 5. 2 is a perspective view of an adapter 100. FIG. It is a figure explaining the assembly of the adapter.

  With reference to FIGS. 1-5, one Embodiment of the adapter for bucket attachment by this invention is described. FIG. 1 is an overall side view of an earth drill machine in which a bucket mounting adapter according to the present invention is used. This earth drilling machine has a front frame 3 (in this example, a two-stage front) pivotally attached to the lower part of a boom 2 attached to the front of the crane body 1 so as to be raised and lowered. A frame is shown.), And a Keriba driving device 4 is attached to the upper part thereof.

  The rotating part 4a of the kelly bar driving device 4 is provided with a driving hole extending vertically, and the telescopic kelly bar 7 is inserted into the driving hole so as to be movable up and down and not relatively rotatable. The kelly bar 7 is formed by fitting a plurality of kelly bars of different sizes so as to be extendable and non-rotatable, and is configured in, for example, a three-stage type, a four-stage type, a five-stage type, or the like. The bucket 5 is attached to the lower end of the innermost kelly bar (inner kelly bar) 7 directly or via a bucket mounting adapter 100 described later. A wire rope 8 is connected to the kelly bar 7 through a swivel bell joint (rotary joint) 13, and the wire rope 8 is wound around a sheave 9 at the top of the boom 2 and wound by a winch 10 on the crane body 1. It is drawn out. In the following description, it is assumed that the vertical direction of each figure and the vertical direction of each member described in each figure match unless otherwise specified.

  FIG. 2 is a view showing a longitudinal section in the vicinity of the lower end of the kelly bar 7, and FIG. 3 shows the kelly bar 7, the bucket mounting adapter (hereinafter simply referred to as an adapter) 100, and the excavating bucket 5 in a separated state. FIG. 4 is a perspective view of the adapter 100. FIG. As shown in FIG. 2, the excavation bucket 5 is attached to the lower end of the kelly bar 7 via an adapter 100. When the size of the corner shaft portion 7a at the lower end of the kelly bar 7 is different from the size of the corner boss portion 5a at the upper portion of the excavating bucket 5 and the adapter 100 cannot directly connect the kelly bar 7 and the excavating bucket 5, It is an adapter inserted between the excavation bucket 5.

  The adapter 100 includes a first attachment portion 110, a second attachment portion 120, and a flange portion 130. The first attachment portion 110 includes an angular shaft portion 111 that is inserted into the upper corner boss 5 a of the excavation bucket 5, and a retaining portion 112 that has a larger cross-sectional shape than the angular shaft portion 111 at the upper portion of the angular shaft portion 111. And have. A pin hole 111 a for connecting to the square boss 5 a of the excavation bucket 5 is provided in the square shaft portion 111.

  As shown mainly in FIG. 3, the second mounting portion 120 is provided below the corner boss portion 121 into which the corner shaft portion 7 a at the lower end of the kelly bar 7 is inserted and the square hole 121 a inside the corner boss portion 121. The retaining member 122 is provided. The corner boss portion 121 is provided with a pin hole 121b for connecting to the corner shaft portion 7a of the keri bar 7. The flange portion 130 is a disk-shaped member, and the upper surface thereof is welded to the outer peripheral surface at the lower end of the second attachment portion 120, thereby being fixed to the lower end of the second attachment portion 120. Reference numeral 140 denotes a welded portion between the outer peripheral surface at the lower end of the second mounting portion 120 and the upper surface of the flange portion 130. The flange portion 130 is provided with a square hole 131 at the center of the disk. The square shaft portion 111 of the first mounting portion 110 is inserted into the square hole 131.

  The cross-sectional shape of the square shaft part 111 is made into the dimension which can be detachably fitted in the square hole 5b of the square boss | hub 5a of the excavation bucket 5, similarly to the conventional adapter. The cross-sectional shape of the square hole 121a of the square boss part 121 is set to a dimension that can be detachably fitted to the square shaft part 7a at the lower end of the keri bar 7 as in the conventional adapter. The cross-sectional shape of the angular shaft part 111 is unchanged from the upper part to the lower part of the angular shaft part 111 except for the presence or absence of chamfering of the corner part. In other words, the diameter of the angular shaft portion 111 defined by the interval between two opposing side surfaces among the four side surfaces of the angular shaft portion 111 is inserted into the square hole 5b of the angular boss 5a. The portion that transmits the rotational force to the excavation bucket 5 and the portion that contacts the inner peripheral surface of the square hole 131 of the flange portion 130 are the same.

  As will be described later, the cross-sectional shape of the square hole 131 is such that the inner peripheral surface of the square hole 131 comes into contact with the side surface of the square shaft portion 111 of the first mounting portion 110 and the rotational force of the keri bar 7 is applied from the flange portion 130. The dimensions are such that there is no inconvenience for transmission to the angular shaft portion 111. In other words, the cross-sectional shape of the square hole 131 is such that the angular shaft portion 111 of the first mounting portion 110 can be inserted, and the cross-sectional shape of the square hole 131 is excessively unstable when the rotational force of the kelly bar 7 is transmitted to the angular shaft portion 111. The dimensions are appropriately determined so as not to occur.

  The cross-sectional shape of the retaining portion 112 of the first mounting portion 110 is larger than the cross-sectional shape of the square hole 131 of the flange portion 130. Therefore, in the first mounting portion 110, when the square shaft portion 111 is inserted into the square hole 131 of the flange portion 130, the lower end surface of the retaining portion 112 abuts on the upper end surface of the flange portion 130. As a result, the first attachment portion 110 does not fall down downward from the square hole 131 of the flange portion 130.

  Further, the retaining member 122 of the second mounting portion 120 is disposed in the vicinity of the upper end of the retaining portion 112 of the first mounting portion 110. As a result, the upward movement of the first mounting portion 110 is restricted when the retaining member 122 contacts the upper end of the retaining portion 112.

  As shown in FIG. 2, the adapter 100 and the kelly bar 7 are connected by inserting the pin 152 by aligning the pin hole 7b of the square shaft portion 7a of the kelly bar 7 and the pin hole 121b (see FIG. 3) of the square boss portion 121. It is done by wearing. Similarly, the adapter 100 and the excavation bucket 5 are connected by inserting the pin 151 by aligning the pin hole 5c (see FIG. 3) of the square boss 5a of the excavation bucket 5 and the pin hole 111a of the angular shaft portion 111. Done.

  The adapter 100 is assembled as follows. As shown in FIGS. 5A and 5B, the square shaft portion 111 of the first mounting portion 110 is inserted into the square hole 131 of the flange portion 130. Thereafter, as shown in FIG. 5C, the second mounting portion 120 is covered from the upper surface of the flange portion 130, and as shown in FIG. 5D, the outer peripheral surface at the lower end of the second mounting portion 120 and the flange portion 130. Weld the top surface of

  In the adapter 100 configured as described above, the rotational force of the kelly bar 7 is changed from the angular shaft portion 7a of the kelly bar 7 to the square boss portion 121 of the second mounting portion 120, from the square boss portion 121 to the flange portion 130, and to the flange portion 130. Is transmitted from the angular shaft 111 to the angular boss 5 a of the excavation bucket 5. From the flange portion 130 to the square shaft portion 111, the inner peripheral surface of the square hole 131 comes into contact with the side surface of the square shaft portion 111 of the first mounting portion 110, and the rotational force of the kelly bar 7 is transmitted to the excavation bucket 5. . Thus, since the surfaces contact each other and transmit the rotational force from the flange portion 130 to the angular shaft portion 111, the durability is high and a large rotational force can be transmitted.

  Since the cross-sectional shape of the angular shaft portion 111 is invariable from the upper portion to the lower portion of the angular shaft portion 111 except for the presence or absence of chamfering of the corner portion, that is, there is no suddenly changing portion of the diameter. In the angular shaft portion 111 where the stress is increased because the diameter is the smallest, there is no place where the stress is extremely concentrated, so that the fatigue strength is increased. The second mounting portion 120 and the flange portion 130 are welded and fixed at the welded portion 140. However, since the welded portion 140 has a larger diameter than the square shaft portion 111, the stress is reduced, and the stress is reduced. There is no concern of a decrease in fatigue strength due to concentration. In addition, since the adapter 100 has a simple structure including the first mounting portion 110, the second mounting portion 120, and the flange portion 130, the adapter 100 can be manufactured at low cost and the manufacturing itself is easy.

  When the rectangular shaft portion 111 is inserted into the rectangular hole 131 of the flange portion 130, the lower end surface of the retaining portion 112 at the upper portion of the rectangular shaft portion 111 is configured to come into contact with the upper end surface of the flange portion 130. And it was comprised so that the upward movement of the 1st attaching part 110 might be controlled when the retaining member 122 contact | abuts to the upper end of the retaining part 112. FIG. Thereby, even if it does not weld, the 1st attaching part 110 can be fixed with respect to the flange part 130 (2nd attaching part 120) with a simple structure. Therefore, since it is not necessary to weld the angular shaft portion 111 where the stress is high because the diameter is the smallest in the adapter 100, stress concentration on the welded portion, cracking, lack of joint strength due to welding defects, etc. And the manufacture of the adapter 100 is facilitated.

---- Modified example ---
(1) In the above description, the cross-sectional shape of the angular shaft portion 111 is invariable from the upper portion to the lower portion of the angular shaft portion 111 except for the presence or absence of chamfering of corner portions (four corner portions of a substantially rectangular cross section). However, the present invention is not limited to this. For example, in the angular shaft portion 111 where the stress is high because the diameter is the smallest in the adapter 100, the fatigue strength increases if there is no place where the stress is extremely concentrated. . Therefore, the diameter may gradually change from the upper part to the lower part of the angular shaft part 111.

(2) The structure of the adapter 100 described above is an example, and the present invention is not limited to the structure of the adapter 100 described above. In other words, the adapter 100 may be configured to abut against the angular shaft portion 111 having the smallest diameter from the side surface and transmit the rotational force from the kelly bar 7 by contact between the surfaces.
(3) You may combine each embodiment and modification which were mentioned above, respectively.

The present invention is not limited to the above-described embodiment, and is interposed between the excavation bucket located below and the kelly bar located above the bucket and transmitting the rotational force to the bucket. In the bucket mounting adapter to be mounted, a first mounting member having an angular shaft portion to be inserted into the upper corner boss of the bucket and a second mounting member having an angular boss portion into which the angular shaft at the tip of the kelly bar is inserted. And a member that is welded and fixed to the second mounting member, and has a rectangular hole portion that has a rectangular cross section that is substantially the same shape as the rectangular cross section perpendicular to the axial direction of the angular shaft portion. The shaft portion is inserted along the axial direction, and the rotational force from the kelly bar transmitted through the second mounting member between the inner peripheral surface of the rectangular hole portion and the side surface of the angular shaft portion that are in contact with each other is the first. Rotational force transmitted to 1 mounting member And a reach member, the first mounting member, square shaft portion is inserted toward the top in a rectangular hole of the rotation transmitting member downward, the upper end portion in order to prevent the falling out from the rectangular hole downward A restriction that has a retaining part that has a larger cross-sectional shape than the sectional shape of the rectangular hole part, and the second mounting member is disposed above the retaining part and restricts the upward movement of the square shaft part. It includes a bucket mounting adapter having various structures characterized by having a portion .

5 Drilling bucket 7 Keriba 100 Adapter for attaching the bucket (Adapter)
DESCRIPTION OF SYMBOLS 110 1st attachment part 111 Square shaft part 112 Retaining part 120 Second attachment part 121 Square boss part 122 Retaining member 130 Flange part 131 Square hole 140 Welding part

Claims (2)

In the bucket mounting adapter interposed between the bucket for excavation located below and the kelly bar located above the bucket and transmitting the rotational force to the bucket,
A first attachment member having an angular shaft portion to be inserted into the upper angular boss of the bucket;
A second mounting member having an angular boss square shaft is inserted at the tip of the Keriba,
A member that is welded and fixed to the second attachment member, and has a rectangular hole portion that has a substantially same shape as a rectangular cross section perpendicular to the axial direction of the angular shaft portion; The angular shaft portion is inserted along the axial direction, and is transmitted via the second attachment member between the inner peripheral surface of the rectangular hole portion and the side surface of the angular shaft portion that are in contact with each other. A rotational force transmitting member that transmits rotational force from a Keriba to the first mounting member ;
The first mounting member is inserted into the rectangular hole portion of the rotation transmitting member from the upper side to the lower side to prevent the angular shaft portion from dropping downward from the rectangular hole portion. It has a retaining portion that exhibits a larger cross-sectional shape than the cross-sectional shape of the rectangular hole,
The bucket attachment adapter, wherein the second attachment member has a restriction portion that is disposed above the retaining portion and restricts the upward movement of the angular shaft portion . The adapter for attaching a bucket according to claim 1 ,
The angular shaft portion includes a portion in which the diameter of the angular shaft portion defined by the interval between two opposing side surfaces among the four side surfaces of the angular shaft portion is inserted into the angular boss at the top of the bucket; A bucket mounting adapter characterized in that it is the same at a portion in contact with the inner peripheral surface of the rectangular hole.

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