JPH093952A - Attachment of gutter-digging hydraulic shovel - Google Patents

Abstract

PURPOSE: To design the offset mechanism part of the attachment of a gutter- digging hydraulic shovel so that it is not damaged by external factors and to enhance its appearance by reducing its breadth. CONSTITUTION: A vertical pin 14 to which a base boom 2 and a transversely folding boom 4 are pivoted is secured to the base boom 2, and a pinion 22 is secured to the vertical pin 14. A vertical pin 23 to which the transversely folding boom 4 and an offset arm 6 are pivoted is secured to the offset arm 6, and a pinion 24 is secured to the vertical pin 23. The pinions 22, 24 are formed to have the same pitch and the same number of teeth. A beam 25 is placed on the right inside surface of the transversely folding boom 4 in such a way as to be free to slide longitudinally, and racks 26, 27 are formed at both ends of the beam 25. The racks 26, 27 mesh with the respective pinions 22, 24. The first end of an offset cylinder 13 is pivoted to the left inside surface of the transversely folding boom 4, and its rod end is pivoted to the inside surface of the beam 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an attachment for a gutter excavating hydraulic excavator, and more particularly to an attachment for a gutter excavating hydraulic excavator in which an arm and a bucket are formed so as to be offset in the left-right direction of the machine body.

[0002]

2. Description of the Related Art Attachments of a conventional side-grooving hydraulic excavator of this type are shown in FIGS. A base boom 2 is attached to the front part of the machine body 1 so as to be vertically rotatable, a base bracket 3 is projectingly provided on one side of the tip of the base boom 2, and a laterally bent boom 4 is laterally attached to the tip of the base boom 2. A link rod 5 is pivotally mounted on the base bracket 3 so as to be rotatable in the left-right direction in parallel with the laterally bent boom 4.

Further, the front portion of the offset arm 6 is pivotally attached to the front end portion of the laterally bending boom 4 so as to be rotatable in the left-right direction, and a top bracket 7 is projectingly provided on one side surface of the front end of the offset arm 6, The front end of the link rod 5 is connected to the top bracket 7. Further, the arm 8 and the bucket 9 are sequentially connected to the tip end portion of the offset arm 6, and the arm cylinder 10 and the bucket cylinder 11 are expanded and contracted so that the arm 8 and the bucket 9 are rotatable in the front-rear direction.

On the other hand, a bracket 12 is fixedly mounted on one side surface of an intermediate portion of the horizontal bending boom 4, the bracket 12 and the base bracket 3 are connected by an offset cylinder 13, and the offset cylinder 13 is connected to the horizontal bending boom 4. And the link rod 5 are interposed in a substantially diagonal shape. here,
If the rod pivot point of the base bracket 3 is a, the rod pivot point b of the top bracket 7, the front pivot point of the horizontal boom 4 is c, and the rear pivot point of the horizontal boom 4 is d, , A quadrangle connecting the respective pivot points a-b-c-d forms a parallelogram.

Accordingly, when the side-to-side boom 4 is rotated left and right due to the expansion and contraction of the offset cylinder 13,
The offset arm 6 moves parallel to the base boom 2, and the arm 8 and the bucket 9 move offset. For example, when the offset cylinder 13 is contracted, the laterally bent boom 4 and the link rod 5 are rotated leftward as shown in FIG. 8, and the arm 8 and the bucket 9 are offset-moved leftward to carry out side digging. be able to.

[0006]

In the attachment of the conventional ditch excavator, an offset mechanism portion such as a link rod or an offset cylinder is provided on the left and right outer surfaces of the attachment so as to project therefrom. Therefore, these offset mechanisms are easily damaged by external factors. Further, since the lateral width is large, these offset mechanism parts may collide with the side wall of the gutter and damage the side wall when the gutter is deeply dug. Furthermore,
The appearance is complicated and complicated.

As another structure of the offset mechanism,
Two horizontal folding booms are installed side by side in a pair, as in the case of No. 6-4155 and No. 6-14242, and the base end of one horizontal boom and the tip of the other horizontal boom are connected. There is also proposed a structure in which an offset cylinder is arranged on a diagonal line connecting the connecting lines, but such a structure still has problems in width and appearance.

Therefore, the attachment of the gutter hydraulic excavator has a technical problem to be solved in order to make the offset mechanism not damaged by an external factor and to narrow the lateral width and improve the aesthetic appearance. Therefore, the present invention aims to solve the problems.

[0009]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned problems, and a laterally bent boom is pivotally attached to the tip of a base boom so as to be rotatable left and right, and further, the laterally bent. In an attachment of a gutter excavator in which an offset arm is pivotally attached to the tip of a boom so that the arm and the bucket extending to the offset arm can be offset in the left-right direction of the machine body. And a pinion is disposed on each of the pivot axis of the base boom and the lateral bending boom and the pivot axis of the lateral bending boom and the offset arm, and the pinions are fixed to the base boom and the offset arm, respectively, and A rack is arranged along the front-rear direction of the folding boom, and both ends of the rack are engaged with the pinions, respectively, and the rack is further folded into a horizontal boom. By freely formed move back and forth I, in which the pinion relative to the rack to provide a groove dug in a hydraulic excavator attachment, characterized in that formed to the same angular rotation to one another.

[0010]

When the rack arranged along the horizontally bending boom is moved back and forth, the pair of pinions meshing with both ends of the rack rotate at the same angle with respect to the rack. Since one of the pinions is arranged on the pivot axis of the base boom and the side-bending boom, and is fixed to the base boom,
When the base boom is used as a reference, the side-bending boom rotates by the same angle in a direction opposite to the rotation direction of the pinion with respect to the rack. Further, since the other pinion is arranged on the pivotal axis of the horizontal bending boom and the offset arm and is fixed to the offset arm, if the horizontal bending boom is used as a reference, the other pinion is attached to the rack. The offset arm rotates in the same direction as the direction of rotation by the same angle. That is, the offset arm also moves to the left and right in accordance with the rotation of the lateral bending boom with respect to the base boom in the left-right direction, but since the offset arm rotates at the same angle in the direction opposite to the rotation direction of the horizontal bending boom, Always maintains a parallel relationship with the base boom. Therefore, the arm and the bucket extended to the offset arm also move in the left-right direction while maintaining the parallel relationship with the base boom.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The same components as in the prior art are denoted by the same reference numerals, and description thereof will be omitted. FIG. 1 is a side view of the attachment without being offset, in which a vertical pin 14 is planted at the tip of the base boom 2.
The base end portion of the boom 4 is laterally foldable and pivotally attached to the left and right in a rotatable manner. As shown in FIG. 2, the vertical pin 14 is composed of an upper pin 15, a lower pin 16 and a center pin 17, and inner cavities 18 and 19 are formed in the lower surface of the upper pin 15 and the upper surface of the lower pin 16, respectively. 1
The upper part of the center pin 17 is press-fitted into the inner cavity 18 of the No. 5 and the lower part of the center pin 17 is fitted into the inner cavity 19 of the lower pin 16 with a gap. Further, splines 20 and 21 are engraved on the lower end outer peripheral surface of the upper pin 15 and the upper end outer peripheral surface of the lower pin 16, respectively, and a pinion 22 is fitted to the splines 20 and 21, and the vertical pin 1
4 is fixed to the base boom 2 by taper pins 29 and 30.

Further, as shown in FIG. 1, a vertical pin 23 having the same structure as the vertical pin 14 is planted at the base end portion of the offset arm 6, and the tip end portion of the horizontally bent boom 4 is attached to the vertical pin 23. The vertical pin 2 is pivotally attached to the left and right and is rotatable.
When the pinion 24 is screwed onto the pinion 3, the pinion 2
4 is fixed to the vertical pin 23 and the offset arm 6. The pinion 22 and the pinion 24 have the same pitch and the same number of teeth.

Further, as shown in FIG. 3, a beam 25 is slidably disposed along the longitudinal direction of the front and rear on the right inner side surface of the horizontal folding boom 4, and racks are provided at both ends of the beam 25, respectively. The parts 26 and 27 are formed, and the rack parts 26 and 27 are formed.
Mesh with the pinions 22 and 24, respectively. Further, a cylinder bracket 28 is provided in the vicinity of the base end portion on the left inner side surface of the horizontal folding boom 4, and the base end portion of the offset cylinder 13 is pivotally attached to the cylinder bracket 28. The tip of the rod of the offset cylinder 13 is pivotally attached to the inner surface of the beam 25.

Therefore, when the offset cylinder 13 is extended, the beam 25 slides forward (toward the offset arm 6) as shown in FIG.
At the same time, the pinions 22 and 24 meshing with the racks 26 and 27 rotate clockwise with respect to the beam 25 at the same angle. Here, the offset cylinder 13
Assuming that the rotation angle of the pinions 22 and 24 with respect to the beam 25 at the time of maximum extension is + θ ₁ (the clockwise direction in the drawing is positive, the same applies below), the pinion 22 is fixed to the base boom 2. Therefore, the horizontal bending boom 4 actually rotates to the left by the angle −θ ₁ with the vertical pin 14 as the pivot. Then, the side-bending boom 4
With the rotation, the offset arm 6, the arm 8 and the bucket 9 extending from the laterally folded boom 4 are deflected to the left and right of the base boom 2 and the machine body 1.

On the other hand, since the pinion 24 is fixed to the offset arm 6, the offset arm 6 is deflected to the left as the horizontal folding boom 4 rotates, and the vertical pin 23 is used as a fulcrum for lateral movement. It will rotate to the right with respect to the folding boom 4 by an angle + θ ₁ . Therefore, the offset arm 6, the arm 8 and the bucket 9 are always offset in the leftward direction while maintaining a parallel relationship with the base boom 2 and the machine body 1.

On the contrary, as shown in FIG. 5, when the offset cylinder 13 is contracted, the beam 25 slides backward (toward the base boom 2), and the pinions 22 and 24 rotate counterclockwise with respect to the beam 25. Rotate at the same angle. Here, when the rotation angle of the pinions 22 and 24 with respect to the beam 25 when the offset cylinder 13 is contracted by the maximum amount is −θ ₂ , the horizontal bending boom 4 rotates the vertical pin 14 as in the case described above. The offset arm 6 rotates to the right by an angle + θ ₂ as a fulcrum, and the offset arm 6 makes an angle to the left with respect to the horizontal folding boom 4 with the vertical pin 23 as a fulcrum.
Rotate by θ ₂ . The offset arm 6, the arm 8 and the bucket 9 are used for the base boom 2 and the body 1.
It always offsets to the right while maintaining a parallel relationship.

Thus, the arm 8 and the bucket 9 can be freely offset to the left and right of the machine body 1 as in the case of the conventional attachment. When compared with the conventional offset mechanism using a link rod, the pinion 22,
Since the offset mechanism including the rack 24, the racks 26, 27, etc. can be housed inside the single horizontal folding boom 4, it is possible to prevent the offset mechanism portions from being damaged by an external factor. In addition, the width of the attachment can be reduced, and when digging gutters,
The risk of damaging the side wall with the bracket or link rod is eliminated. Further, it can contribute to the improvement of aesthetics.

The means for sliding the beam 25 back and forth is not limited to the offset cylinder 13, but may be formed so as to slide by an electric or hydraulic motor, or manually. It may be configured to be slidable. Further, the present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified one.

[0019]

As described in detail in the above one embodiment, the present invention has pinions respectively arranged on the pivot axes of the base boom and the lateral bending boom and the pivot axes of the lateral bending boom and the offset arm. , The rack is meshed with the pair of pinions, and the rack is formed to be movable back and forth,
The base boom and the offset arm are configured to turn sideways and rotate in the same direction and at the same angle with respect to the boom. As a result, not only can the arm and bucket extended to the offset arm be freely offset in the left-right direction of the machine body as in the conventional case, but by installing an offset mechanism consisting of a pinion and a rack inside the laterally bent boom, Can be prevented from being damaged by external factors. In addition, since it is not necessary to project link rods, offset cylinders, and their pivot brackets on the left and right outer surfaces as in the conventional case, the width of the attachment can be narrowed, and the side wall of the gutter can be used when digging the gutter. There is also no risk of damaging the. In addition, it has various effects, such as a smarter appearance and a better appearance.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a pivotally connecting portion between a base boom and a laterally bending boom in FIG.

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

FIG. 4 is a cross-sectional view when the offset cylinder is extended in FIG.

FIG. 5 is a cross-sectional view when the offset cylinder is contracted in FIG.

FIG. 6 is a side view showing a conventional example.

FIG. 7 is a plan view showing a conventional example.

FIG. 8 is a plan view when the offset cylinder is contracted in FIG.

[Explanation of symbols]

 1 Aircraft 2 Base boom 4 Sideways folding boom 6 Offset arm 8 Arm 9 Bucket 13 Offset cylinder 14,23 Vertical pin 22,24 Pinion 25 Beam 26,27 Rack section

Claims (1)

[Claims] 1. An offset arm is rotatably pivoted to the left and right at the tip of a base boom, and an offset arm is pivotally pivoted to the left and right at the tip of the lateral fold boom to offset the offset. In an attachment of a gutter excavator that is formed so that an arm and a bucket extended to the arm can be offset in the left-right direction of the machine body, a pivot axis of the base boom and the horizontal bending boom and a horizontal bending boom and an offset arm Pinions are respectively arranged on the pivot shafts of the racks, the pinions are fixed to the base boom and the offset arm, respectively, and the racks are arranged along the front-back direction of the horizontal folding boom, and both ends of the racks are respectively arranged. By engaging the pinion and further forming the rack so that it can be moved back and forth along the boom, the pinion is attached to the rack. An attachment for a hydraulic excavator of a ditch, characterized in that they are formed to rotate at the same angle with each other.