JPH0657950U - Side digging attachment structure - Google Patents

Abstract

(57) [Summary] [Purpose] Conventionally, various considerations have been made to pass the hydraulic piping inside the side digging attachment.
Since the vicinity of the front boom has a fairly complicated structure, the installed hydraulic hose etc. interfered with each other, and it was unsatisfactory for maintenance. This problem is solved. [Structure] In the structure of the side digging attachment of the present invention, the left and right side plates are erected on a long bottom plate to form a frame body,
The front end of the frame is rotatably pivoted to the left and right at the rear part of the central part of the upper boom in the front-rear direction, and the rear end of the frame is
The front part of the rear boom in the front-rear direction is rotatably pivoted to the left and right, and the hydraulic pipes leading to the arm cylinder and the bucket cylinder passing through the inside of the pair of front booms are passed through the inside of the frame.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a piping structure for a side digging attachment mounted on a construction machine such as a hydraulic excavator.

[0002]

[Prior art]

 FIG. 6 is a perspective view of a main part of the conventional side edge excavation attachment 1. FIG. 7 is a plan view of essential parts showing a state in which the side digging attachment 1 in FIG. 6 is offset to the left with respect to the center line 0-0 of the rear boom 2 by an offset amount WL. In the side digging attachment 1 shown in FIGS. 6 and 7, the front boom 3 and the rod 3 ′ and the upper boom 4 are sequentially connected to the tip of the rear boom 2 so as to be rotatable left and right, respectively, and the arm is attached to the upper boom 4. 5. A bucket (not shown) is rotatably connected in the front-rear direction. The arm 5 and the bucket are offsetly moved to the left and right by adjusting the expansion and contraction of the offset cylinder 7. In addition, the hydraulic pipes 10 and 11 communicating from the vehicle body (not shown) to the arm cylinder 8 and the bucket cylinder 9 are exposed along the outer surface side of the rear bracket 12 of the front boom 3, the upper boom 4, and the arm 5. Has been done.

[0003]

[Problems to be solved by the device]

 In the conventional side digging attachment, the hydraulic pipe is arranged on the outer surface side in an exposed state. However, an accident may occur when the hydraulic piping collides with or gets caught by an external obstacle, and the appearance of the hydraulic piping is poor, so various considerations have been taken to store it inside. There is. However, since the front boom tip, upper boom, and rear of the arm form a fairly complicated connection mechanism, the hydraulic hoses, etc. installed inside them made interference contact, and maintenance was poor. The present invention aims to solve the above problems.

[0004]

[Means for Solving the Problems] The structure of the side digging attachment of the present invention is such that a rear boom is attached to the front part of the vehicle body, and a pair of front booms parallel to each other are rotated to the left and right at the bifurcated front end of the rear boom. The upper boom is connected to the front ends of the pair of front booms, the arm and the bucket are sequentially connected to the upper boom, and the hydraulic pipes leading from the vehicle body side to the arm cylinder and the bucket cylinder are connected to the pair of front booms. The side digging allows the bucket to be moved laterally by adjusting the offset cylinder by diagonally arranging the offset cylinder between the pair of front booms. The structure of the attachment is a frame that has a long bottom plate in the front and The front end of the frame is rotatably supported by the rear part of the center of the upper boom in the front-rear direction, and the rear end of the frame is connected to the rear boom. A hydraulic pipe that is pivotally supported to the left and right in the front of the center in the front-rear direction and that communicates with the arm cylinders and bucket cylinders that pass through the inside of the pair of front booms passes through the inside of the frame.

[0005]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a side digging attachment 13 of the present invention. In the figure, 14 is a rear boom, 15L and 15R are a pair of left and right front booms, 16 is an upper boom, 17 is an arm, 18 is a bucket, 19 is a boom cylinder, 20 is an offset cylinder, 21 is an arm cylinder, 22 is a bucket cylinder, Reference numeral 23 is a hydraulic pipe leading from the vehicle body (not shown) to the offset cylinder 20, 24 is a hydraulic pipe leading to the arm cylinder 21, 25 is a hydraulic pipe leading to the bucket cylinder 22, and 26 is a pair of left and right front booms 15L and 15R. It is a frame body provided inside. FIG. 2 is a partial cutaway plan view of the side digging attachment 13 of FIG. FIG. 3 is a cross-sectional view of the main part viewed from AA of FIG. In the drawing, 27 is a bottom plate of the frame 26, and 28L and 28R are left and right side plates. FIG. 4 is a plan view of essential parts showing a state where the offset cylinder 20 of the side digging attachment 13 of the present invention is extended. In the figure, the phantom line B shows the case where the offset cylinder (20) is contracted.

Next, the structure of the side digging attachment 13 of the present invention will be described with reference to FIGS. In the present invention, the frame 26 in which the left and right side plates 28L and 28R are erected on the long bottom plate 27 in the front-rear direction is formed into a size that can be inserted into the inside of the pair of front booms 15L and 15R. The front end of the upper boom 16 is pivotally supported by a vertical pin 29 (shown in FIG. 2) on the rear part of the center of the upper boom 16 in the front-rear direction, and the rear end of the frame 26 is connected to the rear boom 14. The arm cylinder 21 and the bucket cylinder 22 that are pivotally supported by a vertical pin 30 (shown in FIG. 2) in the front part of the center part in the front-rear direction and pass through the inside of the pair of front booms 15L and 15R. The hydraulic pipes 24 and 25 that communicate with each other are arranged to pass through the inside of the frame 26.

Next, the operation of the structure of the side digging attachment 13 of the present invention will be described. In the structure of the present invention, the left and right side plates 28L, 28R are erected on the long bottom plate 27 to form the frame body 26, and the front end portion of the frame body 26 is the rear portion of the central portion of the upper boom 16 in the front-rear direction. To the left and right so as to be pivotally supported by a vertical pin 29, and the rear end of the frame body 26 to the front and rear of the center portion of the rear boom 14 in the front-rear direction to be vertically rotatable to a vertical pin 30. So I was pivoted. As a result, when the offset cylinder 20 is expanded and contracted, the frame body 26 rotates left and right in parallel with the left and right front booms 15L and 15R. Therefore, if the hydraulic pipes 24, 25 are passed through the inside of the frame body 26, the lengthwise direction of the hydraulic pipes 24, 25 does not occur, and at the same time, the hydraulic pipes 24, 25 are slightly moved in correspondence with the left and right offset operations. However, it can be moved smoothly. Further, not only does the hydraulic pipes 24, 25 arranged on the inner side of the frame body 26 not cause contact interference with other structures outside the frame body 26, but also when the offset cylinder 20 extends, the rod portion of the frame body 26 is not supported by the frame body 26. It can also serve as a protector. FIG. 5 is a sectional view of the essential parts of another embodiment of the frame body 26 of the present invention. In the frame body 26 'in FIG. 5, the cover plate 31 is removably additionally attached to make the storage arrangement of the hydraulic pipes 24 and 25 more reliable.

[0008]

[Effect of device]

 Conventionally, various considerations have been made so that the hydraulic piping of the side digging attachment is housed and disposed inside the side digging attachment without being exposed to the outer surface side of the side digging attachment. However, the front part of the front boom, the upper part of the boom, and the rear part of the arm form a fairly complicated connection mechanism, and the hydraulic hoses, etc. installed inside them made interference contact, which made maintenance unsatisfactory. However, in the structure of the side digging attachment of the present invention, the left and right side plates are erected on the long bottom plate to form the frame body, and the front end portion of the frame body is attached to the rear portion of the center portion of the upper boom in the front-rear direction. An arm cylinder that is pivotally supported to the left and right, and the rear end of the frame is pivotally supported to the front of the center of the rear boom in the front-rear direction, and is passed through the inside of the pair of front booms. Also, the hydraulic pipe leading to the bucket cylinder is made to pass through the inside of the frame. As a result, when the offset cylinder expands and contracts, the frame rotates left and right in parallel with the left and right front booms. Therefore, if the hydraulic pipe is routed inside the frame, the lengthwise direction of the hydraulic pipe does not occur, and at the same time, the hydraulic pipe can be moved smoothly, albeit slightly, in response to the lateral offset operation. . In addition, the hydraulic piping arranged on the inner side of the frame does not cause contact interference with other structures outside the frame, and also serves to protect the rod portion of the frame when the offset cylinder extends. be able to.

[Brief description of drawings]

FIG. 1 is a side view of a side digging attachment of the present invention.

FIG. 2 is a partial cutaway plan view of the side digging attachment of FIG.

FIG. 3 is a cross-sectional view of a main part seen from AA of FIG.

FIG. 4 is a plan view of essential parts showing a state in which the offset cylinder of the side digging attachment of the present invention is extended and operated.

FIG. 5 is a sectional view of a main part of another embodiment of the frame body according to the present invention.

FIG. 6 is a perspective view of a main part of a conventional side digging attachment.

7 is a plan view of relevant parts showing a state in which the side digging attachment in FIG. 6 is offset.

[Explanation of symbols]

 1,13 Side digging attachment 2,14 Rear boom 3,15L, 15R Front boom 4,16 Upper boom 5,17 Arm 7,20 Offset cylinder 8,21 Arm cylinder 10,11,23,24,25 Hydraulic piping 18 Bucket 22 Bucket cylinder 26, 26 'Frame body 27 Bottom plate 28L, 28R Side plate

Claims (1)

[Scope of utility model registration request] 1. A rear boom is attached to a front portion of a vehicle body, a pair of front booms parallel to each other is provided at a bifurcated front end portion of the rear boom so as to be rotatable in a left-right direction, and an upper boom is provided at front end portions of the pair of front booms. Connect the arms and buckets to the upper boom in order, and let the hydraulic piping leading from the vehicle body side to the arm cylinder and the bucket cylinder pass through the inside of the pair of front booms, and also offset between the pair of front booms. The structure is a side digging attachment in which cylinders are diagonally arranged and the offset cylinder is adjusted to move the bucket to the left and right, and the left and right side plates are attached to the long bottom plate in the front-rear direction. The standing frame pair is formed into a size that can be inserted inside the front boom, and the front end of the frame body is Part of the upper boom is pivotally supported to the left and right in the rear part of the center part in the front-rear direction, and the rear end of the frame is pivotally supported to the front part of the center part of the rear boom in the left-right direction. A structure for a side digging attachment, characterized in that hydraulic piping leading to an arm cylinder and a bucket cylinder passing through a pair of front booms is passed through an inner side of the frame body.