JP2563570Y2 - Side excavation boom - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side excavation boom provided on a side excavation hydraulic excavator.

[0002]

2. Description of the Related Art FIG. 5 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 swing body, 3 is a side digging attachment attached to the front portion of the upper swing body 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 are 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. 5, a rear boom 4 is attached to a front portion of the upper revolving superstructure 2, and a front boom 5 and an upper boom 6 are sequentially connected to a front end portion of the rear boom 4 so as to be rotatable left and right, 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. 6 is a plan view showing a state where the side digging attachment 3 in FIG. 5 has been subjected to an offset operation.
In the drawing, 13 is a rod, 14 is a rod bracket fixed to the side surface of the tip of the rear boom 4, 15 is a rod bracket fixed to the side surface of the upper boom 6, and 0-0 are front and rear of the rear boom 4. Center line of 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. 7 is a plan view showing a state where the side digging attachment 3 in FIG. 6 forms a parallel link. In the drawing, reference numeral 16 denotes a vertical pin at the front end of the front boom 5;
Is a vertical pin at the base end of the front boom 5, b is the axis of the vertical pin 17 at the base end, 18 is a front rod pin that pivotally supports the front end of the rod 13 to the bracket 15, and c is a front rod pin 18 19 is the bracket 1 at the rear end of the rod 13.
A rear rod pin pivotally supported at 4 is a rear rod pin. Therefore, the distance ab from the axis a to the axis b is ab = L
1. Distance cd from axis c to d is cd = L1, axis a
Is ac = L2, and the distance bd from the axis b to d is bd = L2. Therefore, the axis cd
Since a parallel link is formed in which the quadrilateral connecting -b-a-c is a parallelogram, the side digging can be performed by offset-moving the arm 7 in parallel with the center line 0-0. FIG. 8 shows a conventional side digging attachment 3.
FIG. 2 is a perspective view of a main part showing a hydraulic piping group a disposed in the apparatus. 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 side excavation attachment, hydraulic piping from a control valve mounted on the upper swing body to various hydraulic actuators (bucket cylinder, arm cylinder, offset cylinder, etc.) is provided. It 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 present invention
An object is to solve the above problems.

[0005]

Means for Solving the Problems A side digging attachment provided with a boom (a combination of a rear boom, a front boom, and an upper boom) is provided.
An offset cylinder is interposed between the two brackets fixed to the same side surface of the front boom and the upper boom, and a cover member is provided on the outer side surface of the offset cylinder, and the front end of the cover member is connected to the upper boom. The vertical cover front pivot pin supports the bracket on the offset cylinder mounting side, and the rear end of the cover member is the rear cover in the vertical direction relative to the offset cylinder mounting side bracket on the rear boom. When the offset cylinder is extended and retracted by pivoting with an extension pin, the front side of the cover, the rear end of the cover, the front end of the front boom, and the front end of the front boom are connected. This is a side excavation attachment that is configured so that the shape is always a parallelogram. That it was set to pass the inner side of the cover member as a pipe passage in the hydraulic pipe. In addition, a reinforcing plate is provided inside the cover member so that buckling is not caused by a load acting in the longitudinal direction of the cover member. And
Hydraulic piping from the upper structure to the hydraulic actuator
The cover member was arranged in a space between the inner corner portion and the reinforcing plate.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows the boom (rear boom 2) of the present invention.
1, a front boom 22 and an upper boom 23 connected to each other are referred to as a boom of the present invention). In the figure, 7 '
Is an arm, 8 'is a bucket, 9' is a boom cylinder, 2
4 is an offset cylinder, 11 'is an arm cylinder, 1
2 'is a bucket cylinder, 16' is a front boom 22
Of the front end of the front boom 22; 25 of the cover member; 26, 27 and 28, the rear boom 21, the front boom 22, and the upper boom 23;
Each bracket fixed to the side of the same side of each, 2
9 is a vertical pin on the front of the cover, 30 is a vertical pin on the rear of the cover,
31 is a hydraulic pipe extending from a control valve mounted on an upper rotating body (not shown) to the bucket cylinder 12 ′,
Reference numeral 32 denotes a hydraulic pipe leading to the arm cylinder 11 ′, and reference numeral 33 denotes a hydraulic pipe leading to the offset cylinder 24.

FIG. 2 is a plan view of a main part showing a state where the side digging attachment 20 in FIG. 1 has been subjected to an offset operation. In the figure, 34 is a reinforcing plate provided inside the cover member 25, 0'-0 'is a center line in the front-rear direction of the rear boom 21, a' is an axis of the vertical pin 16 ', and b' is a base. The axis of the end vertical pin 17 ', the axis of c' is the axis of the front cover pin 29, the axis of d 'is the axis of the rear cover pin 30, and 3;
Reference numeral 5 denotes a cover provided on the side surface of the rear boom 21. FIG. 3 is a cross-sectional view of the cover member 25 in FIG.

Next, the structure of the side excavation boom of the present invention will be described with reference to FIGS. The side digging attachment 20 with the boom of the present invention is an offset cylinder 2
4 are fixed to the same side surface of the front boom 22 and the upper boom 23.
A cover member 25 is provided on the outer side surface of the offset cylinder 24, and the front end of the cover member 25 is vertically pinched with respect to the bracket 28 of the upper boom 23. 29, and the rear end of the cover member 25 is pivotally supported by a vertical cover rear vertical pin 30 with respect to a bracket 26 on the offset cylinder mounting side of the rear boom 21.
4 when the cover 4 is extended and retracted, the axis C 'of the front cover pin 29, the axis d' of the cover rear pin 30, the axis b 'of the front boom base pin 17', the front boom. A side digging attachment in which a quadrilateral in plan view connecting an axis a 'of the vertical pin 16' is always a parallelogram, wherein a hydraulic actuator (bucket cylinder 12 ', arm Hydraulic pipes 31 and 3 leading to the cylinder 11 'and the offset cylinder 24).
The passages 2 and 33 were set to pass through the inside of the cover member 25. In addition, a reinforcing plate 34 is provided inside the cover member 25 so as not to buckle a load acting on the cover member 25 in the longitudinal direction. Then, the bucket cylinder 12 'and the arm cylinder 1
Hydraulic piping reaching 1 'is connected to spaces 36, 37 between the inner corner of the cover member 25 and the reinforcing plate 34 (shown in FIG. 3).
And arranged.

Next, the operation of the side excavating boom of the present invention will be described. The hydraulic piping 31 extending from the control valve of the upper swing body to the bucket cylinder 12 ′ is provided inside a cover 35 (shown in FIG. 2) provided on the side surface of the rear boom 21, inside the front end side of the rear boom (21), and a bracket 26.
Inside, a space portion 37 of the cover member 25 (shown in FIG. 3),
The inner side of the upper boom 23 and the inside of the base end side of the arm 7 ′ are connected to the bucket cylinder 12 ′. The hydraulic piping 32 passes through the inside of the cover 35 provided on the side surface of the rear boom 21, the inside of the front end side of the rear boom (21), the inside of the bracket 26, the space 36 of the cover member 25, and the inside of the upper boom 23, Arm cylinder 11 '
Connected to. The hydraulic piping 33 is provided inside the cover 35 provided on the side surface of the rear boom 21 and the rear boom (21).
Inside of the tip side, inside of bracket 26, cover member 25
Is connected to the offset cylinder 25 through the inside of the cylinder. Therefore, in the boom for side excavation of the present invention, the rear boom 21, the cover member 25, the cover member 25, and the hydraulic pipe from the upper swing body to the hydraulic actuator are not exposed.
It can pass through the inside of the upper boom 23.

Next, FIG. 4 shows a cover member 2 according to the present invention.
It is sectional drawing which shows the reinforcement plate 34 'of the other Example provided in 5.
In the figure, reference numerals 36 'and 37' denote space portions between the inner corner portion of the cover member 25 and the reinforcing plate 34 '.
The cross-sectional shape of the reinforcing plate 34 'is semicircular. Since the reinforcing plate provided on the cover member 25 prevents buckling against a load acting in the longitudinal direction of the cover member 25, the reinforcing plate may have a cross-sectional shape other than the reinforcing plate 34 '.

[0011]

According to the prior art, the hydraulic piping extending to the bucket cylinder, arm cylinder, and offset cylinder provided in the side excavation attachment is arranged in an exposed state. For this reason, the hydraulic piping may be damaged by colliding with or catching with an external obstacle. Also, the above hydraulic piping is messy,
The appearance was bad. However, in the boom for side excavation of the present invention, the hydraulic piping from the upper swing body to the hydraulic actuator is passed through the inside of the cover member provided on the side surface outside the offset cylinder from the inside of the rear boom. As a result, the hydraulic piping does not collide with or be caught by an external obstacle. Also, since the hydraulic piping was not exposed to the outside, the boom for side excavation became simple and the appearance improved. Further, since the reinforcing plate is provided inside the cover member, it is possible to prevent the cover member from buckling against a load acting on the cover member during the offset operation. Therefore, the side digging attachment with the side digging boom of the present invention improves the maintainability and strength,
The appearance can be enhanced.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a side digging attachment having a boom of the present invention.

FIG. 2 is a main part plan view showing a state where an offset operation has been performed on a side digging attachment in FIG. 1;

FIG. 3 is a cross-sectional view of the cover member taken along line AA in FIG.

FIG. 4 is a cross-sectional view illustrating a reinforcing plate provided on a cover member according to another embodiment of the present invention.

FIG. 5 is a side view of a conventional hydraulic excavator for side excavation.

FIG. 6 is a plan view showing a state where a side digging attachment in FIG. 5 is offset.

FIG. 7 is a plan view showing a state in which the side digging attachment in FIG. 6 forms a parallel link.

FIG. 8 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 Side digging attachment 4,21 Rear boom 5,22 Front boom 6,23 Upper boom 7,7 'Arm 10,24 Offset cylinder 11,11' Arm cylinder 12,12 'Bucket cylinder 16,16' Pin 17, 17 'Base end vertical pin 25 Cover member 29 Cover front vertical pin 30 Cover rear vertical pin 31, 32, 33 Hydraulic piping 34, 34' Reinforcement plate 36, 36 ', 37, 37' Space Department

Claims (3)

(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.
An arm and a bucket are sequentially connected to the upper boom so as to be rotatable in the front-rear direction, and an offset cylinder is interposed between both brackets fixed to the same side surface of the front boom and the upper boom. A cover member is provided on the outer side surface of the cylinder, and the front end of the cover member is pivotally supported by a vertical cover front vertical pin with respect to a bracket on the offset cylinder mounting side of the upper boom. The end of the rear boom is pivoted to the bracket on the side where the offset cylinder is mounted by the vertical cover rear pin, and when the offset cylinder is extended or contracted, the cover front vertical pin, cover rear vertical pin, front The quadrilateral in plan view that connects the boom base end pin and front boom tip end pin is always a parallelogram In the side digging attachment that urchin configuration, boom sides drilling, characterized in that set to pass the inner side of the cover member as placement channel hydraulic pipes leading to the hydraulic actuator from the upper rotating body. 2. A side excavating boom according to claim 1, wherein a reinforcing plate is provided inside the cover member so as not to buckle against a load acting in the longitudinal direction of the cover member. A side excavation boom characterized in that: 3. The side excavation boom according to claim 2, wherein a hydraulic pipe extending from the upper swing body to the hydraulic actuator is provided in a space between an inner corner portion of the cover member and the reinforcing plate. A boom for side excavation, wherein the boom is disposed on a side.