JP2538162Y2 - Extension arm for double bucket of excavator - Google Patents

Description

[Detailed description of the invention] << Industrial application field >> This invention relates to an extension arm used when a double bucket is suspended from the tip of an arm of a hydraulic shovel to perform a digging operation.

<< Conventional Technology >> In excavating work using a hydraulic excavator, a double-opening bucket is suspended at the tip of an arm of a hydraulic excavator, and the bottom of the hole during excavation of the bucket is dumped by swinging up and down and swinging of a boom and an arm. This is done by reciprocating above the truck bed and loading the soil at the bottom of the hole into the dump truck bed.

The depth of the hole that can be excavated by such an operation is limited by the length of the arm of the excavator, and when it is necessary to dig a deep hole, an extension arm is connected to the tip of the arm and the tip of the extension arm is connected. Suspend the bucket.

FIGS. 4 and 5 schematically show a hydraulic excavator performing a digging operation by attaching an extension arm having a conventional structure, wherein 21 is a traveling device, 22 is a swivel base, and 23 is a steering cabin. It is.

In FIG. 4, the extension arm 24 is fixed to the tip of the arm 9 and is substantially integrated, and the fixing pins 11, 12 are provided by using two pin holes for mounting the shovel at the tip of the arm 9. , The extension arm 24 is fixed to the tip of the arm 9.

5 shows a structure in which the extension arm 24 is suspended from the tip of the arm 9 by a single pin 25. The extension arm 24 is vertically suspended from the tip of the arm 9 by the weight of itself and the double bucket 13. It is in a suspended state.

<< Problem to be Solved by the Invention >> When the extension arm 24 having the structure shown in FIGS. 4 and 5 is used, it becomes possible to excavate a hole as deep as the length of the attached extension arm 24. Therefore, when drilling a deeper hole, the length of the extension arm 24 should be increased. However, in the structure shown in FIGS. 4 and 5, the length of the extension arm was limited and it was not possible to dig a very deep hole for the following reasons.

That is, in the structure shown in FIG.
When 13 is moved above the dump truck 19, it extends in the lateral direction of the extension arm 24.If the extension arm 24 is made too long, the swing arm is increased due to the increase in the arm length and the weight of the double bucket and the sediment gripped by the bucket. The overturning moment acting on 22 becomes large, and finally there is a danger that the excavator may overturn. On the other hand, in FIG. 5, since the maximum lift of the double bucket 13 is reduced by the length of the extension arm 24, if the extension arm 24 is made too long, the double bucket 13 may be lifted above the bed of the dump truck 19. become unable. For this reason, the structures shown in FIGS. 4 and 5 have the drawback that the extension arm 24 cannot be made too long, and the depth of the hole that can be excavated using the hydraulic shovel cannot be made deep.

The object of the present invention is to obtain an extension arm that can excavate a deeper hole using a hydraulic excavator.

<< Means for Solving the Problems >> The extension arm of the present invention comprises a first arm fixed substantially integrally to a tip of an arm 9 of a hydraulic shovel, and a bending pin 3 bent at the tip of the first arm. The first arm 1 and the second arm 2 have substantially the same length, and a double bucket 13 is attached to the tip of the second arm. Things. The structure for fixing the first arm 1 to the arm 9 of the excavator may be the same as the conventional structure shown in FIG.
The structure for mounting the double bucket at the tip of the second arm 2 may be the same as the conventional structure shown in FIG.

<< Operation >> When the double bucket 13 attached to the tip of the extension arm having the above structure is moved to the bottom of the hole 18, the arm 9 and therefore the first arm 1 is turned downward, and the first arm 1 and the second arm 2 are moved downward. Are arranged in series in the same direction, so that the depth of the excavable hole 18 is the length of the first arm 1 and the second arm 2
It becomes deeper by the amount of the length. One-sided bucket 13
Is moved above the loading platform of the dump truck 19, the arm 9, and thus the first arm 1 is turned upward, so that the decrease in the maximum lift of the double bucket 13 caused by the suspension of the second arm 2 is The first arm 1 is compensated by being turned upward, so that the maximum lift of the double bucket 13 is not significantly reduced. Also, when the arm 9 is extended in the lateral direction, the arm length of the overturning moment applied to the vehicle body is shorter by the arm length of the second arm 2 than that of the structure of FIG.

Therefore, in the structure of the present invention, the effective length of the extension arm 24, that is, the effective length for increasing the depth of the excavable hole is conventionally reduced without lowering the maximum lift of the bucket or increasing the overturning moment. , Ie, the length of the first arm 1 plus the length of the second arm 2 plus the excavating hole depth.

<< Embodiment >> FIG. 1 is a perspective view showing an embodiment of the extension arm of the present invention. In the figure, reference numeral 1 denotes a first arm, 2 denotes a second arm, and 3 denotes a pivot pin for connecting the distal end of the first arm 1 and the proximal end of the second arm 2 so as to be freely bent. 1st arm 1
Is formed by connecting two side plates 4 in parallel by a connecting member 5, and a recess 6 having a width substantially equal to the width of the arm 9 of the hydraulic shovel is formed on the base end side. 7 and 8 are the first arm 1
A pin hole 10 is formed in the recess 6 of the side plates 4, 4 to fix the arm to the tip of the arm 9 of the hydraulic shovel, and a through hole 10 is provided at the tip of the second arm 2 in parallel with the pivot pin 3. Hole.

The tip of the arm 9 is inserted into the recess 6 of the first arm 1, and two pins 11 and 12 (FIG. 2) are used at the tip of the arm 9 for mounting a shovel. The base end of the first arm 1 is fixed to the tip end of the arm 9. Double door bucket
A bracket 13 suspends the bracket 14 with a bolt 15 fixed to a through hole 10 provided at the end of the second arm 2. In FIG. 2, reference numeral 16 denotes a bucket opening / closing cylinder, which guides hydraulic pressure for swinging the shovel to the cylinder 16 to open and close the double bucket 13.

FIG. 3 shows a state in which a digging operation is performed by a hydraulic shovel using the extension arm. The solid line is a double bucket.
The imaginary line indicates the state of the arm when the 13 is moved to the bottom of the hole 18 and the imaginary line indicates the state of the arm when the double bucket 13 is moved above the loading platform of the dump truck 19.

<< Effects of the Invention >> As is clear from the explanation of the above-mentioned operation and the comparison between FIGS. 3 and 4 and 5, the use of the extension arm of the present invention makes it possible to excavate in a digging operation using a hydraulic excavator. The possible hole depth can be increased without sacrificing the maximum lift of the bucket, and the increase in the hole depth that can be excavated by using the extension arm can be increased by using the conventional extension arm. There is an effect that it can be approximately doubled.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the extension arm of the present invention, FIG. 2 is a perspective view showing a mounted state of the extension arm of FIG. 1, and FIG. 3 is a hydraulic excavator using the extension arm of the present invention. FIG. 4 and FIG. 5 are schematic views showing a digging operation with a hydraulic excavator using a conventional extension arm. In the figure, 1: 1st arm, 2: 2nd arm 3: pivot pin, 7, 8: pin hole 9: arm of hydraulic excavator, 10: through hole 13: double open bucket

Claims (1)

(57) [Scope of request for utility model registration] 1. A first arm (1) and a second arm (2) having approximately equal lengths refractively connected by a pivot pin (3), and the opposite end of the first arm (1). Is provided with fixing means (7, 8) for fixing the arm to the tip of the arm (9) of the hydraulic shovel, and a double-opening bucket (13) is provided at the non-connection end of the second arm (2). An extension arm for a double bucket of a hydraulic shovel, provided with a mounting means (10) for mounting.