JP2563571Y2 - Hydraulic excavator for side excavation - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a side excavation attachment mounted on a hydraulic excavator for side excavation.

[0002]

2. Description of the Related Art FIG. 10 is a side view of a conventional hydraulic excavator for side excavation. In the figure, 1 is a lower traveling body,
2 is an upper revolving structure, 3 is a side digging attachment attached to the front of the upper revolving structure 2, 4 is a rear boom of the side digging attachment 3, 5 is a front boom, 6 is an upper boom, 7 is an arm, and 8 is A bucket, 9 is a boom cylinder, 10 is an offset cylinder, 11 is an arm cylinder, and 12 is a bucket cylinder. In the hydraulic excavator for side excavation shown in FIG. 10, the rear boom 4 is attached to the front part of the upper revolving superstructure 2, and the front boom 5 and the upper boom 6 are sequentially connected to the tip of the rear boom 4 so as to be rotatable in the left and right directions, respectively. The side digging attachment 3 is formed by sequentially connecting the arm 7 and the bucket 8 to the upper boom 6 so as to be rotatable in the front-rear direction, and the arm 7 can be offset-moved by adjusting the offset cylinder 10 to expand and contract. I have to.

FIG. 11 is a plan view showing a state where the side digging attachment 3 in FIG. 10 has been subjected to an offset operation. In the drawing, 13 is a rod, 14 is a bracket for a rod fixed to the side surface of the distal end of the rear boom 4, 15
Is a rod bracket fixed to the side surface of the upper boom 6, 0-0 is the center line of the rear boom 4 in the front-rear direction,
WL is an offset amount on the left side from the center line 0-0, and WR is an offset amount on the right side. FIG. 12 is a plan view showing a state where the side digging attachment 3 in FIG. 11 forms a parallel link. In the figure, 16 is a vertical pin at the distal end of the front boom 5, a is the axis of the vertical pin 16 at the distal end, 17 is a vertical pin at the proximal end of the front boom 5, and b is a vertical pin at the proximal end. An axis, 18 is a front rod pin pivotally supporting the front end of the rod 13 to the bracket 15, C is an axis of the front rod pin 18, and 19 is a rear rod pin pivotally supporting the rear end of the rod 13 to the bracket 14. , D is the axis of the rear rod pin 19. Thus, the distance ab from the axis a to b is ab = L1, the distance cd from the axis c to d is cd = L1, and the distance ac from the axis a to c is ac = L2.
The distance bd from the axis b to d is bd = L2.
Therefore, a parallel link is formed in which the quadrilateral connecting the axes cd-ba-a-c becomes a parallelogram, so that the arm 7 is offset-moved in parallel to the center line 0-0 to dig the side. It can be performed. FIG. 13 is a perspective view showing a hydraulic piping group A disposed on the side digging attachment 3 of the related art. The hydraulic piping group A is provided from a control valve (not shown) mounted on the upper swing body 2 to various hydraulic actuators (bucket cylinder 12, arm cylinder 11, offset cylinder 10, etc.).

[0004]

In the prior art hydraulic excavator for side excavation, a single front boom receives an excavation reaction force acting on a bucket during the excavation work.
The rod provided in parallel with it was for forming a parallel link. For this purpose, one front boom must be firmly configured, so that the overall shape of the front boom is large, and furthermore, the rear end boss and the front end boss of the front boom, the base vertical pin, and the front vertical pin. Had a large diameter and length. Not only is it difficult to assemble the above-mentioned vertical pins, but also the side digging attachment is very heavy. Therefore, the hydraulic excavator for excavating the gutter is not well balanced in the front-rear direction, and the energy loss during the operation of raising the boom is large, so that the fuel consumption is large and uneconomical. Further, since the rod for forming the parallel link is provided so as to protrude to the side of the front boom, there is a problem that the rod collides with an external obstacle, and the appearance is poor. The hydraulic piping from the control valve mounted on the upper revolving structure to various hydraulic actuators (bucket cylinder, arm cylinder, offset cylinder, etc.) is arranged in an exposed state. For this reason, the hydraulic piping may be damaged by colliding with or catching on an external obstacle. Also, since the hydraulic piping was exposed in a mess-like manner, the appearance of the side digging attachment was poor. The purpose of the present invention is to solve the above problems.

[0005]

In the hydraulic excavator for side excavation of the present invention, a pair of left and right front booms having substantially the same shape and dimensions are provided in parallel with each other about a center line in the front-rear direction of the rear boom, and the pair of front booms is provided. The rear end and front end of the rear boom are pivotally connected to the left and right sides of the rear boom and the left and right sides of the upper boom so that the offset cylinder is positioned inside the pair of front booms. Is pivotally supported on the rear vertical pin of one front boom, and the rod tip of the offset cylinder is pivotally supported on the front side of the other front boom. Alternatively, the base end of the offset cylinder is pivotally supported at the rear of the front boom near the rear vertical pin of one front boom, and the rod end of the offset cylinder is connected to the front of the other front boom. Pivoted against the side. Alternatively, the proximal end of the offset cylinder is pivotally supported on the front vertical pin of one of the front booms, and the rod distal end of the offset cylinder is pivotally supported with respect to the rear side of the other front boom. Alternatively, the base end of the offset cylinder is pivotally supported at the front of the front boom near the front vertical pin of one front boom, and the rod end of the offset cylinder is connected to the front boom of the other front boom. Pivoted to the posterior side. Further, the hydraulic piping from the upper swing body to the hydraulic actuator is disposed in the space inside the pair of left and right front booms.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view of a main part of a side excavation attachment 20 mounted on a side excavation hydraulic excavator of the present invention. In the figure, 21 is a side digging attachment 20
Rear boom, 22L and 22R are a pair of left and right front booms, 23 is an upper boom, 7 'is an arm, 8' is a bucket, 9 'is a boom cylinder, 24 is an offset cylinder, 11' is an arm cylinder, 12 'is a bucket cylinder, Reference numeral 25 denotes a hydraulic pipe extending from a control valve mounted on an upper rotating body (not shown) to the offset cylinder 24; 26, a hydraulic pipe extending to the arm cylinder 11 ';
Is a hydraulic pipe leading to the bucket cylinder 12 '.

FIG. 2 shows the front boom 22 shown in FIG.
It is a principal part top view of arrow A around L, 22R. In the figure, reference numeral 28 denotes a bifurcated front end of the rear boom 21, 29L, 29
R is a bracket provided on the left and right sides of the upper boom 23,
30L and 30R are left and right front pins, 31L and 31R.
Is the left and right rear pins, 32 is the rod tip pin,
a ′, b ′, c ′, d ′ are the vertical pins 30L, 31
L's, 30R's, and 31R's respective axis centers, and 0'-0 'are front-rear center lines of the rear boom 21. FIG.
It is an arrow side view. FIG. 4 is a cross-sectional view of a principal part taken along the line CC in FIG.

Next, the configuration of the side excavation attachment 20 of the hydraulic excavator for side excavation according to the first aspect of the present invention will be described with reference to FIGS. A pair of left and right front booms 22L, 22R having substantially the same shape and dimensions are provided in parallel with each other about a center line 0'-0 'in the front-rear direction of the rear boom 21, and the rear end and the front end of the pair of front booms 22L, 22R are provided. The forked front end 28 of the rear boom 21 and the upper boom 23
The left and right side brackets 29L and 29R are pivotally attached to the left and right sides so as to be rotatable left and right.
The base end of the offset cylinder 24 is pivotally supported on the rear vertical pin 31L of one of the front booms 22L so that the offset cylinder 24 is positioned inside the front boom 22R. The front end of the 22R is pivotally supported by a rod tip pin 32.

Next, the operation of the hydraulic excavator according to the first aspect of the present invention will be described. As shown in FIG. 2, when the center line 0′-0 ′ of the rear boom 21 coincides with the center line in the front-rear direction of the upper boom 23, the offset amount of the side excavation attachment 20 is 0 (zero).
Then, a'b '= c'd' = L3 and a'c '=
Since b'd '= L4, the axis c'-d'
The quadrilateral connecting -b'-a'-c 'forms a parallel link. FIG. 5 is a main part plan view in the case where the offset cylinder 24 is contracted to offset the upper boom 23 to the left of the center line 0′-0 ′ by the offset amount WL. FIG. 6 is a plan view of a main part when the offset boom 23 is extended to offset the upper boom 23 to the right of the center line 0′-0 ′ by the offset amount WR.
As shown in FIGS. 4 and 5, when the offset cylinder 24 is operated to expand and contract, the quadrilateral c′-d′-b′-a′-c ′ is always a parallelogram. Side excavation can be performed without hindrance.
Moreover, since the pair of front booms 22L and 22R receive the excavation reaction force during the excavation work of the excavator equally, the front vertical pins 30L and 30R and the rear vertical pins 31
Since L and 31R can be set to the minimum diameter and the rod for the parallel link used in the prior art is not required, the side excavation attachment can be reduced in weight considerably.

FIG. 7 is a plan view of a main part of a side digging attachment 20 'of another embodiment of the side digging attachment 20 shown in FIG. This side digging attachment 20 '
Then, the base end of the offset cylinder 24 is pivotally supported by the rear vertical pin 31R of the front boom 22'R, and the rod end of the offset cylinder 24 is connected to the front boom 2
It was pivotally supported on the front side of the 2′L by a rod tip pin 32.
The left and right offset amounts of the side digging attachment 20 ′ are opposite to the left and right relationship with the offset amounts of the side digging attachment 20. In the side digging attachments 20, 20 ', the mounting direction of the offset cylinder 24 in the front-rear direction may be reversed.

FIG. 8 is a plan view of a main part of the side excavation attachment 33 of the hydraulic excavator for side excavation according to claim 2 of the present invention. In the figure, the same reference numerals are given to components using the same components as the side digging attachment 20 of the first aspect. Reference numerals 34L and 34R denote a pair of left and right front booms, and reference numeral 35 denotes a cylinder base end pin pivotally supporting the base end of the offset cylinder 24. Next, the configuration of the side digging attachment 33 will be described with reference to FIG. A pair of left and right front booms 24L and 34R having substantially the same shape and dimensions are provided in parallel with each other about the front-rear direction center line 0'-0 'of the rear boom 21.
The rear end and front end of the L and 34R are the forked front end 28 of the rear boom 21 and the brackets 2 on the left and right sides of the upper boom 23.
9L and 29R so as to be rotatable left and right, and the offset cylinder 24 is positioned so that the offset cylinder 24 is positioned inside the pair of front booms 34L and 34R.
The base end of the front boom 34L is pivotally supported by the cylinder base end pin 35 at the rear of the front boom 34L near the rear vertical pin 31L, and the rod end of the offset cylinder 24 is connected to the rear end of the front boom 34L. The other front boom 34R is pivotally supported by a rod tip pin 32 on the front side. The operation and function of the side digging attachment 33 are the same as those of the side digging attachment 20 of the first aspect.

Next, FIG. 9 is a plan view of a main part of the side excavation attachment 36 of the hydraulic excavator for side excavation according to claim 3 of the present invention. In the figure, the same reference numerals are given to components using the same components as the side digging attachment 20 of the first aspect. 37L and 37R are a pair of left and right front booms. Next, the configuration of the side digging attachment 36 will be described with reference to FIG. A pair of left and right front booms 37L, 37R having substantially the same shape and dimensions are provided in parallel with each other about a center line 0'-0 'in the front-rear direction of the rear boom 21, and the rear end and the front end of the pair of front booms 37L, 37R are provided. The pair of front booms 37L, 3L are pivotably connected to the fork front end 28 of the rear boom and the brackets 29L, 29R on the left and right sides of the upper boom 23 so as to be rotatable left and right.
The base end of the offset cylinder 24 is pivotally supported on the front vertical pin 30L of one of the front booms 37L so that the offset cylinder 24 is located inside the inner cylinder 7R. The boom 37R is configured to be pivotally supported by the rod tip pin 32 on the rear side. The operation and function of the side digging attachment 36 are the same as those of the first embodiment.
Is the same as

Next, a hydraulic excavator for side excavation according to a fourth aspect of the present invention will be described. The side digging attachment of claim 4 is not shown, but will be described with reference to the side digging attachment 36 in FIG. In the side digging attachment according to the fourth aspect, the base end of the offset cylinder (24) is connected to the front vertical pin (3L) of the front boom (37L).
0L) at the front of the front boom (37L) and the rod end of the offset cylinder (24) is pivotally supported at the rear of the front boom (37R). The function and function of the side digging attachment of the fourth aspect are the same as those of the side digging attachment 36 of the third aspect.

Next, claim 5 of the present invention will be described with reference to FIG. In the present invention, the hydraulic pipes 27, 26, 25 extending from the bucket cylinder 12 ', the arm cylinder 11', and the offset cylinder 24 (from the upper revolving unit) are arranged in the space inside the pair of left and right front booms 22L, 22R. I did it. Thereby, the hydraulic piping 27, 2
Piping could be performed so that 6, 6 and 25 were not exposed outside the front booms 22L and 22R.

[0015]

In the prior art hydraulic excavator for side excavation, the excavation reaction force is received by one front boom, so that the large diameter base end and front end vertical pins are attached.
It also had parallel link rods and the side digging attachment was very heavy. Therefore, the front-rear balance of the hydraulic excavator is poor, and the fuel efficiency during excavation work is large, which is uneconomical. Also, since the hydraulic piping is disposed outside the front boom, the hydraulic piping may be caught and damaged, and the appearance may be poor. However, in the present invention, a pair of left and right front booms having substantially the same shape and dimensions are provided in parallel with each other about the center line in the front-rear direction of the rear boom, and an offset cylinder is mounted inside the pair of front booms and a space inside the front boom is provided. Various hydraulic piping was arranged. As a result, since the two front booms receive the excavation reaction force during excavation, the rear and front vertical pins can be made small diameter pins, and the rod for the parallel link can be eliminated. Therefore, the side excavation attachment of the present invention is reduced in weight, the stability of the excavator for side excavation is improved, the fuel efficiency during excavation work is improved, and the economy can be improved. Also, since the offset cylinder and the hydraulic piping around it are arranged inside the pair of front booms, the hydraulic piping and the like are protected to prevent breakage, and the appearance is improved and the aesthetic appearance can be enhanced.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a side excavation attachment mounted on a hydraulic excavator for side excavation of the present invention.

FIG. 2 is a plan view of a part around the front boom in FIG.

FIG. 3 is a side view as viewed in the direction of arrow B in FIG. 2;

FIG. 4 is a cross-sectional view of a principal part taken along the line CC of FIG. 1;

FIG. 5 is a plan view of a main part when the offset cylinder according to the first aspect of the present invention is subjected to a minimum contraction operation.

FIG. 6 is a plan view of a main part when the offset cylinder according to the first aspect of the present invention is operated to extend the minimum length.

FIG. 7 is a plan view of a relevant part of another example of the side digging attachment shown in FIG. 2;

FIG. 8 is a plan view of a main part of the side digging attachment according to the second aspect of the present invention.

FIG. 9 is a plan view of a main part of the side digging attachment according to the third aspect of the present invention.

FIG. 10 is a side view of a conventional hydraulic excavator for side excavation.

FIG. 11 is a plan view showing a state where the side digging attachment in FIG. 10 is offset.

12 is a plan view showing a state where the side digging attachment in FIG. 11 forms a parallel link.

FIG. 13 is a perspective view of a main part showing a hydraulic piping group a disposed in a conventional side excavation attachment.

[Explanation of symbols]

3,20,20'33,36 Side digging attachment 4,21 Rear boom 5,22L, 22R, 22'L, 22'R, 34L, 3
4R, 37L, 37R Front boom 6, 23 Upper boom 7, 7 'Arm 10, 24 Offset cylinder 11, 11' Arm cylinder 12, 12 'Bucket cylinder 25, 26, 27 Hydraulic piping 28 Forked front end 30L, 30R Front Vertical pin 31L, 31R Rear vertical pin

Continuation of the front page (56) References Japanese Utility Model Hei 5-38045 (JP, U)

Claims (5)

(57) [Scope of request for utility model registration] 1. A rear boom is attached to a front portion of an upper swing body, and a front boom and an upper boom are sequentially connected to a front end portion of the rear boom so as to be rotatable left and right, respectively.
A hydraulic shovel in which an arm and a bucket are sequentially connected to the upper boom so as to be rotatable in the front-rear direction, respectively, to form a side excavation attachment, and the arm can be offset by adjusting an offset cylinder. A pair of left and right front booms having substantially the same shape and dimensions are provided in parallel with each other about the center line in the front-rear direction of the rear boom, and the rear end and the front end of the pair of front booms are forked at the rear boom, the left and right sides of the upper boom. The front end of one of the front booms is pivotally supported at the base end of the offset cylinder so that the offset cylinder is positioned inside the pair of front booms. And the rod end of the offset cylinder is pivotally supported with respect to the front side of the other front boom. Hydraulic excavators for sides drilling, wherein. 2. A rear boom is attached to a front portion of the upper swing body, and a front boom and an upper boom are sequentially connected to a front end portion of the rear boom so as to be rotatable left and right, respectively.
A hydraulic shovel in which an arm and a bucket are sequentially connected to the upper boom so as to be rotatable in the front-rear direction, respectively, to form a side excavation attachment, and the arm can be offset by adjusting an offset cylinder. A pair of left and right front booms having substantially the same shape and dimensions are provided in parallel with each other about the center line in the front-rear direction of the rear boom, and the rear end and the front end of the pair of front booms are forked at the rear boom, the left and right sides of the upper boom. Pivotally attached to the left and right parts of the front boom so that the offset cylinder is located inside the pair of front booms. Pivot to the rear of the front boom and attach the rod end of the offset cylinder to the other front Hydraulic excavators for sides drilling, characterized by being configured to pivot with respect to the front side of the over arm. 3. A rear boom is attached to a front portion of the upper swing body, and a front boom and an upper boom are sequentially connected to a front end portion of the rear boom so as to be rotatable left and right, respectively, and an arm and a bucket are respectively attached to the upper boom in the front-rear direction. A hydraulic excavator that is rotatably connected to a side excavation attachment and that allows an arm to be offset by adjusting an offset cylinder, and is substantially the same about the center line in the front-rear direction of the rear boom. A pair of left and right front booms of the same shape and size are provided parallel to each other, and the rear end and front end of the pair of front booms are pivotally attached to the left and right sides of the rear boom and the left and right sides of the upper boom. And the offset cylinder is positioned so that the offset cylinder is located inside the pair of front booms. Characterized in that the base end of the front boom is pivotally supported on a front vertical pin of one of the front booms, and the rod tip of the offset cylinder is pivotally supported with respect to the rear side of the other front boom. Hydraulic excavator for side excavation. 4. A rear boom is attached to a front portion of the upper revolving structure, and a front boom and an upper boom are sequentially connected to a front end of the rear boom so as to be rotatable left and right, respectively.
A hydraulic shovel in which an arm and a bucket are sequentially connected to the upper boom so as to be rotatable in the front-rear direction, respectively, to form a side excavation attachment, and the arm can be offset by adjusting an offset cylinder. A pair of left and right front booms having substantially the same shape and dimensions are provided in parallel with each other about the center line in the front-rear direction of the rear boom, and the rear end and the front end of the pair of front booms are forked at the rear boom, the left and right sides of the upper boom. The base end of the offset cylinder is located near the front vertical pin of one of the front booms so that the offset cylinder is positioned inside the pair of front booms. The front end of the front boom and the rod end of the offset cylinder to the other front Hydraulic excavators for sides drilling, characterized by being configured to pivot relative to the rear side of the over arm. 5. The hydraulic excavator for side excavation according to claim 1, wherein the hydraulic pipes extending from the upper revolving unit to the hydraulic actuator are paired with right and left. A hydraulic excavator for side excavation, wherein the hydraulic excavator is disposed in a space inside a front boom.