JPH10195907A - Side-ditch excavation work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work machine which can execute an excavation work including a side-ditch excavation without providing a parallelogrammatmc link mechanism. SOLUTION: In the side-ditch excavation work machine, a boom swing mechanism, in which a vertically swingable boom 4 is horizontally swingably held on a revolving body 2, is comprised of a swing pin 5 and a boom swing cylinder. Then an arm swing mechanism, in which an arm 8 which is vertically swingably connected to the boom 4 and has a bucket 9 at its forward end is horizontally swingably held by the boom 4, holds the arm 8 so as to be vertically swingable and includes a bracket 6 holding an arm cylinder 12 for driving the arm 8, a vertical pin 7, in which the bracket 6 is horizontally swingably held on the boom 4, and an arm swing cylinder 11 for horizontally swinging the bracket 6 with respect to the boom 4 through the pin 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ditch digging machine such as a hydraulic shovel having a ditching function, and more particularly to a boom swing for holding a vertically rotatable boom in a laterally rotatable manner. The present invention relates to a gutter work machine having a mechanism.

[0002]

2. Description of the Related Art An example of this type of conventional trenching work machine is disclosed in Japanese Patent Application Laid-Open No. Hei 6-136778. Hereinafter, this prior art will be described with reference to FIGS.

The prior art shown in FIGS. 6 and 7 is a hydraulic excavator having a trenching function, in which a traveling device 31 and a revolving body constituting a main body disposed on the traveling device 31, that is, a body frame 32 are provided. And a driver seat 33 arranged on the body frame 32.

[0004] Further, a front boom 34 is disposed in front of the body frame 32 and performs excavation work. The front boom 34 can be rotated vertically.
An offset boom 41 connected to the main boom 34 so as to be capable of turning in the lateral direction; a bucket arm 38 connected to the tip of the offset boom 41 so as to be able to turn in the vertical direction; And a bucket 39 that is connected to be rotatable in the vertical direction.
Also, a boom cylinder 4 for driving the main boom 34
0, one end of which is rotatably connected to the main boom 34 and the other end of which is rotatably connected to the offset boom 41, and an offset cylinder 45 for driving the offset boom 41; , And a bucket cylinder 43 for driving the bucket 39.

As shown in FIG. 7, a rod 46 is arranged on the opposite side of the offset cylinder 45 so as to sandwich the offset boom 41 described above. This rod 46
Of the bracket 4 supporting the bucket arm 38
9 is connected to the base 9 via a vertical pin 47a so as to be relatively rotatable.
The other end is connected to a bracket fixed to the main boom 34 via a vertical pin 47b so as to be relatively rotatable. That is, a parallelogram link is formed by the rod 46 and the offset boom 41. The shape of the parallelogram link is changed by driving the offset cylinder 45, and the bucket arm 38 and the bucket 39 are moved in parallel as indicated by a two-dot chain line in FIG.

The above-described main boom 34 is connected to the body frame 32 via a swing support 35 so as to be capable of turning in the lateral direction. As shown in FIG. 7, a swing cylinder 35a is disposed near the swing support 35, one end of which is rotatably connected to the main boom 34, and the other end of which is relatively rotated with respect to the body frame 32. It is movably connected. The swing support 35 and the swing cylinder 35a constitute a boom swing mechanism for holding the main boom 34 on the body frame 32 so as to be rotatable in the lateral direction. The traveling device 31 is provided with an earth removal plate 44 used for the earth removal work of the excavated earth and sand and the ground leveling work.

In this prior art, the main boom 34, the offset boom 41, and the bucket arm 38 are positioned in a straight line, and the boom cylinder 40, the arm cylinder 42, and the bucket cylinder 43 are appropriately expanded and contracted, as shown by a posture S1 in FIG. The main boom 34, the offset boom 41, the bucket arm 38, the bucket 39
Are selectively rotated in the vertical plane, and the normal excavation work by the bucket 39 is performed.

Further, by turning the body frame 32 clockwise from the state of the posture S1 shown in FIG. 7 and extending the swing cylinder 35a and contracting the offset cylinder 45, the main boom 34 is turned counterclockwise in the lateral direction. , And the offset boom 41 rotates clockwise in the horizontal direction, and the state shown in the posture S2 of FIG. 7 is obtained. In this state, when the main boom 34, the bucket arm 38, and the bucket 39 are selectively rotated in the vertical plane as described above, the trenching operation on one side can be performed.

In addition, by turning the body frame 32 counterclockwise from the state of the posture S1 shown in FIG. 7 and contracting the swing cylinder 35a and extending the offset cylinder 45, the main boom 34 is turned clockwise in the horizontal direction. , And the offset boom 41 rotates counterclockwise in the horizontal direction, and the state shown in the posture S3 of FIG. 7 is obtained.
In this state, the trenching work on the other side can be performed.

[0010]

In the above-mentioned prior art, the main boom 34 is provided via a parallelogram link mechanism formed by the offset boom 41 and the rod 46.
, The offset boom 41 is relatively displaced, and the bucket arm 38 and the bucket 39 are relatively displaced with respect to the offset boom 41.
, And the limit of the relative displacement of the bucket arm 38 with respect to the offset boom 41 are susceptible to mechanical limitations associated with the structure of the parallelogram link. Here, for example, when it is desired to normally excavate the outer portion of the posture S2 of FIG. 7 and the building 50 such as a pillar is located near the outside of the front, the form of the posture S3 of FIG. It is conceivable that a desired excavation operation is performed by operating the body frame 32 to rotate while maintaining the position, but the offset cylinder 45 and the offset boom 41 due to the mechanical restrictions associated with the above-described parallelogram link mechanism. Are likely to interfere with the building 50, which prevents the bucket arm 38 from being positioned sufficiently to extend laterally outward, which may limit the area that the bucket 39 can excavate. The same applies to a case where a building 51 such as a pillar exists outside the front forming the posture S3 of FIG. 7 and where it is desired to normally excavate a further outer portion of the posture S3.

The above-mentioned prior art requires a rod 46 for forming a parallelogram link mechanism, two vertical pins 47a and 47b, a bracket for mounting these vertical pins 47a and 47b, and the like. The number of the frames is large, the production is complicated, the production cost is high, and the front weight is basically easy to be heavy.
In consideration of the weight balance with the front wheel 2, it is difficult to set the overall length of the front to be longer, which also tends to limit the area where the bucket can excavate.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances in the prior art, and has as its object to perform a trench excavation operation capable of performing a trench excavation operation including a trench without interposing a parallelogram link mechanism. To provide a machine.

[0013]

According to one aspect of the present invention, there is provided a boom swing for holding a vertically rotatable boom to a main body so as to be rotatable in a lateral direction. In a side-grooving work machine capable of excavating a groove by a bucket while the boom swing mechanism is operated, an arm that is rotatably connected to the boom in a vertical direction is rotated in a lateral direction. The structure is provided with an arm swing mechanism for holding the boom as much as possible.

According to the first aspect of the present invention, a normal excavation operation can be performed by, for example, positioning the boom and the arm on a straight line.

Further, in a state in which the boom swing mechanism is operated and the boom is turned in the horizontal direction, the arm swing mechanism is operated to turn the arm in the horizontal direction relative to the boom, so that the arm is turned. Can be arranged at a position translated in parallel with the arm at the time of normal excavation work in which the above-described boom and arm are positioned on a straight line, and desired guttering can be performed.

The above-described boom swing mechanism merely rotates the boom in the horizontal direction, and therefore may be any means including a boom swing cylinder or the like that can rotate the boom in the horizontal direction with respect to the swing body. It is not necessary to have a parallelogram link structure, and the arm swing mechanism only pivots the arm laterally relative to the boom, so this mechanism also moves the arm laterally relative to the boom. Any means including an arm swing cylinder that can be rotated to any angle is sufficient, and does not require any parallelogram link. That is, by combining the operation of the boom swing mechanism and the operation of the arm swing mechanism, the arm can be moved in the horizontal direction without the interposition of the parallelogram link, and the trench can be realized.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a gutter work machine according to the present invention. FIG. 1 is a side view showing an embodiment of the trench excavation work machine of the present invention, and FIG. 2 is a view showing the embodiment shown in FIG.
3 is a plan view in a state of turning, FIG. 3 is a plan view showing an example of the operation of the embodiment shown in FIGS. 1 and 2, and FIG.
It is a top view which shows the other example of embodiment shown in FIG.

This embodiment is also a hydraulic excavator, for example.
A traveling unit 1 having a pair of crawler tracks, a revolving unit 2 disposed on the traveling unit 1, and a driver seat 3 provided on the revolving unit 2
And a front desk which is disposed at a position in front of the revolving superstructure 2 and performs excavation work. The front is basically a boom 4 that can rotate in a vertical plane, a boom cylinder 10 that rotates the boom 4, an arm 8 that can rotate in a vertical plane, and a rotation of the arm 8. Arm cylinder 1
2, a bucket 9 attached to the tip of the arm 8 so as to be rotatable in a vertical plane, and a bucket cylinder 13 for rotating the bucket 9. Also, as shown in FIG. 2, a swing pin 5 for holding the boom 4 rotatably in the lateral direction with respect to the revolving unit 2, one end connected to the boom 4 side, and the other end connected to the revolving unit 2. Boom swing cylinder 5a. The swing pin 5 and the boom swing cylinder 5a constitute a boom swing mechanism for holding the boom 4 on the swing body 2 so as to be able to rotate in the horizontal direction. Further, the arm 6 is rotatably held in a vertical direction, and a bracket 6 for holding an arm cylinder 12 for driving the arm 8, and a vertical support for supporting the bracket 6 rotatably in the horizontal direction with respect to the boom 4. Pin 7
And an arm swing cylinder 11 for rotating the bracket 6 in the lateral direction with respect to the boom 4 via the vertical pin 7. The bracket 6, the vertical pin 7, and the arm swing cylinder 11 constitute an arm swing mechanism for holding the arm 8 on the boom 4 so as to be able to rotate in the horizontal direction. The traveling body 1 is provided with an earth removal plate 14 used for the earth removal work for excavated earth and sand and the ground leveling work.

In the embodiment configured as described above, the boom 4 and the arm 8 are arranged in a straight line at a position substantially in front of the center of the revolving unit 2 as shown in a posture S11 in FIG.
By appropriately operating the boom cylinder 10, the arm cylinder 12, and the bucket cylinder 13, the boom 4, the arm 8, and the bucket 9 can be selectively rotated in a vertical plane to perform a desired normal excavation operation. it can.

Also, from the state of posture S11 in FIG.
Is rotated clockwise, and the boom swing cylinder 5a is extended to rotate the boom 4 relatively to the revolving structure 2 in the lateral direction. Excavation along a substantially extended line of one of the crawler tracks, that is, a side ditching operation can be performed.

Also, from the state of posture S11 in FIG.
By rotating the revolving unit 2 in the counterclockwise direction and by contracting the boom swing cylinder 5a to rotate the boom 4 relatively to the revolving unit 2 in the lateral direction, S13
As a result, it is possible to carry out a side ditching operation along a substantially extended line of the other crawler belt of the traveling body 1.

Further, for example, when the revolving unit 2 is held stationary and the boom swing cylinder 5a and the arm swing cylinder 11 are contracted from the posture S11 during normal excavation shown in FIG. 4, the arm 8 moves in parallel from the posture S11. The arm 8 can be made to protrude considerably outside of one of the crawler belts of the traveling body 1, and the gutter can be carried out at the protruding position.

When the arm swing cylinder 11 is fully extended from the state of the posture S14 in FIG. 4, the arm 8 turns clockwise in FIG.
The state shown in FIG. 14a is obtained, and normal excavation along the left-right direction at the diagonally right front position of the revolving superstructure 2 becomes possible.

Similarly, when the revolving unit 2 is held stationary from the posture S11 during normal excavation shown in FIG. 4 and the boom swing cylinder 5a and the arm swing cylinder 11 are extended, the arm 8 moves in parallel from the posture S11. As a result, the arm 8 can be made to protrude considerably outside of the other crawler belt of the traveling body 1, and the gutter work can be performed at the protruding position.

When the arm swing cylinder 11 is sufficiently contracted from the state of the posture S15, the arm 8 pivots 90 ° outward in the counterclockwise direction in FIG.
And the normal excavation along the left-right direction at the diagonally forward left position of the revolving superstructure 2 becomes possible.

In the embodiment configured as described above,
Since the boom swing mechanism is constituted by the swing pin 5 and the boom swing cylinder 5a, the boom swing mechanism does not require a parallelogram link structure.
Since the arm swing cylinder 11 and the vertical pin 7 provided on the bracket 6 for rotating the arm 8 are used, this mechanism does not require any parallelogram link structure. That is, it is possible to realize the normal excavation, and to realize the side ditch by moving the arm 8 in parallel without interposing the parallelogram link.

Therefore, in particular, the limit of the relative displacement of the arm 8 with respect to the boom 4 depends on the stroke of the arm swing cylinder 11, and the lateral turning operation of the boom 4 is also shown in FIG. Posture S14 and posture S
14a, the arm 8 can be rotated over a wide area of 90 ° from a state in which, for example, side ditching is possible. Accordingly, the arm swing cylinder 11 is driven even when the building 15 such as a pillar is located near the outside of the front in a case where it is desired to normally dig a further outer portion of the posture S14 in FIG. By rotating the arm 8 in the horizontal direction, for example, 90 °, a desired excavation operation can be performed without causing interference between the building 15 and the front. That is, the arm 8 can be positioned so as to sufficiently extend outward in the lateral direction, and the bucket 9 can excavate a relatively large area. The same applies to a case where a building 16 such as a pillar exists outside the front forming the posture S15 in FIG. 4 and a portion outside the posture S15 is normally to be excavated.

Further, in this embodiment, as described above, a rod for forming a parallelogram link mechanism in the arm swing portion and a vertical pin for connecting such a rod are not required. And the production is relatively easy, and the production cost can be kept low. In addition, the weight of the front can be reduced, and the total length of the front can be set relatively long even in consideration of the weight balance with the revolving superstructure 2 constituting the main body. The possible area can be widened.

In the above-described embodiment, the arm swing cylinder 11 for turning the arm 8 in the lateral direction is mounted on the left side of the boom 4 extending forward of the revolving structure 2 as seen in the plan view of FIG. However, the arm swing cylinder 11 is replaced with the position on the left side of the boom 4 described above, and FIG.
As shown in FIG. In the case of such a configuration, for example, the posture S14 of FIG.
In this case, the arm swing cylinder 11 may be extended in the opposite direction to the above, and in the case of the posture S14a, the arm swing cylinder 11 may be contracted in the opposite direction to the above. The same applies to the postures S15 and S15a. Therefore, the arm swing cylinder 1
Even in the case where the mounting position of 1 is changed, the same operation and effect as the above-described embodiment can be obtained.

[0030]

According to the present invention, it is possible to realize excavation work including ditching without interposing a parallelogram link mechanism, that is, an arm swing without a mechanical constraint peculiar to the parallelogram link mechanism. The arm can be rotated over a wider area from the state where the side ditch can be excavated via the mechanism, so that a desired normal excavation operation can be performed, and workability can be improved as compared with the related art.

As described above, since there is no need for a rod for forming a parallelogram link mechanism in the arm swing portion or a vertical pin for connecting such a rod, the number of members is smaller than in the conventional case. The production is relatively easy and the production cost can be kept low. Furthermore, with the reduction in the number of members, the weight of the front can be reduced, and the overall length of the front can be set relatively long even when the weight balance with the revolving superstructure constituting the main body is taken into consideration.
This also allows for a larger excavation area,
Workability can be improved as compared with the related art.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing an embodiment of the gutter work machine of the present invention.

FIG. 3 is a plan view showing an example of the operation of the embodiment shown in FIGS.

FIG. 4 is a plan view showing another example of the operation of the embodiment shown in FIGS.

FIG. 5 is a plan view showing another embodiment of the present invention.

FIG. 6 is a side view showing a conventional gutter work machine.

FIG. 7 is a plan view of the gutter work machine shown in FIG. 6;

[Explanation of symbols]

REFERENCE SIGNS LIST 1 traveling body 2 revolving unit 4 boom 5 boom swing pin (boom swing mechanism) 5 a boom swing cylinder (boom swing mechanism) 6 bracket (arm swing mechanism) 7 vertical pin (arm swing mechanism) 8 arm 9 bucket 10 boom cylinder 11 arm Swing cylinder (arm swing mechanism) 12 Arm cylinder 13 Bucket cylinder

Claims (2)

[Claims] 1. A boom swing mechanism for holding a vertically rotatable boom on a main body so as to be rotatable in a lateral direction, and a groove can be excavated by a bucket in a state where the boom swing mechanism is operated. A ditch digging machine, comprising: an arm swing mechanism for holding an arm rotatably connected to the boom in a vertical direction to the boom so as to be rotatable in a lateral direction. 2. An arm swing mechanism comprising: a bracket for holding the arm rotatably in a vertical direction, a bracket for holding an arm cylinder for driving the arm, and a lateral rotation of the bracket with respect to the boom. The side-grooving work machine according to claim 1, further comprising: a vertical pin movably supported; and an arm swing cylinder configured to rotate the bracket laterally with respect to the boom via the vertical pin.