JPH0960031A - Arm with built-in breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate breaker operations by improving visibility and to secure the amount of projection in a hydraulic shovel equipped with an arm having a built-in breaker. SOLUTION: An extension arm 7 is attached to a breaker 18 or an arm bracket 14, and a bucket 4, a push link 5, and a bucket link 6 are placed at the end of the extension arm 7. A fixing means 13 is provided for integrating the bucket 4 with the extension arm 7, so that during breaker operations the bucket 4 is held in a waiting position by being rotated by a bucket cylinder 3 together with the extension arm 7.

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 working machine for a hydraulic excavator with an arm having a breaker, which has an excavating working machine and a crushing working machine together.

[0002]

2. Description of the Related Art When a conventional hydraulic excavator with a built-in breaker arm is used for crushing work, as shown in FIG. 13, after rotating the bucket to the rear position in the excavation posture, the chisel is attached to the breaker to operate the arm cylinder. I was adjusting the angle. In the figure, a is a bucket excavation posture,
a'is the pop-out amount in posture a, b is the bucket dump posture, b'is the pop-out amount in posture b, c is the chisel,
d is a bucket, e is an eye point, f is a line of sight, g is an arm cylinder, h is a bucket cylinder, k is a push link, m is a bucket link, and n is a hydraulic excavator with a built-in breaker arm. As a technique close to this technique, Japanese Patent Application No. 3-31051 (Japanese Utility Model Application Laid-Open No. 4-119847), which is a prior application of the present applicant, proposes a hydraulic excavator with a breaker built-in arm.

[0003]

However, in the above-mentioned conventional hydraulic excavator with a built-in breaker arm, if the bucket d is in the posture a when the breaker is working, the line of sight f from the operator's eye point e is obstructed by the bucket d. As a result, only the tip portion of the protrusion amount a ′ of the chisel c, which is sufficiently large, was visible, and the visibility was poor. If the posture b with the bucket d in the front is avoided while avoiding this, there is a problem that the bucket d hits the crushing surface, the protruding amount b ′ of the chisel c becomes extremely small, and the breaker work can hardly be performed. There were also problems such as the need to remove the chisel c, which had a considerable weight. This invention makes it a subject to solve such a malfunction.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and includes a sub-link and a sub-link in addition to a bucket link, a push link, and a bucket cylinder that create rotation of a bucket during excavation work. A push link is provided so that the movement of the bucket cylinder can be transmitted, and the position of the fixing pin that fixes the extension arm with the bucket attached to the breaker or arm bracket is replaced, and the bucket and extension arm fixing means are used. They are integrated, and during the crushing work, the bucket cylinder can be rotated together with the extension arm to retract.

[0005]

According to the present invention, by virtue of having the above-mentioned structure, the visibility of the chisel is sufficiently improved regardless of whether the bucket is retracted forward or backward during the breaker work. Therefore, it is not necessary to remove the bucket and the chisel pops out. In addition to increasing the amount, it is possible to carry out bucket work without removing the chisel with it attached.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are side views showing the first embodiment with the extension arm 7 attached, respectively showing a bucket dump posture state and a bucket excavation posture state during excavation work. The extension arm 7 is attached to the tip of the breaker 18 fixed to the arm bracket 14.
Is fixed by a fulcrum pin 9 and a fixing pin 12, and a bucket 4 and a bucket link 6 are rotatably pin-coupled to the tip of the extension arm 7. For the attachment of the extension arm 7, see
As in the third embodiment shown in FIG. 14, the tip of the arm bracket 14 may be extended and attached and fixed by the fulcrum pin 9 and the fixing pin 12, and the same function as in the first embodiment can be exhibited. . On the other hand, the fulcrum pin 9 of the extension arm 7
A sub-link 8 is rotatably pin-coupled to. The bucket link 6 and the sub link 8 are connected at the same end by a sub push link 10. The sub push link 10 is connected to the bucket cylinder 3 on the sub link 8 side. It is adapted to be transmitted to the bucket 4 via the push link 5.

FIG. 3 is a perspective view showing an example of the extension arm 7. The four pin holes opened in the center of the side surface are the bucket 4, the bucket link 6, the mounting pin hole for the fulcrum pin 9 and the first pin hole A for mounting the fixing pin 12, and the pin holes off the center of the side surface are the bucket holes. 4 shows a second pin hole B and a third pin hole C used as a fixing means 13 for the 4 and the extension arm 7. The second pin hole B is used when the bucket is rotated to the front position and takes the breaker working posture, and the third pin hole C is used when the bucket is rotated to the rear position and takes the breaker working posture. Fixing means 13
Is part of the formation.

When using the fixing means 13 in FIG.
At the most extended position of the bucket cylinder 3, the operator pulls out the fixing pin 12 attached to the first pin hole A,
The bucket 4 and the extension arm 7 are fixed by replacing the bucket 4 with the second pin hole B, and the drawing shows the state in which the bucket 4 and the extension arm 7 are integrated. Therefore, in the side view of the bucket front retracting posture of the first embodiment shown in FIG. 4, the bucket cylinder 3 is contracted from the state shown in FIG. 2 so that the bucket 4 is moved to the front position with the fulcrum pin 9 as the center. After the pivotal movement, the chisel 19 is attached to the breaker 18 and the breaker work is ready to be performed.

FIG. 5 is a side view showing a second embodiment to which the extension arm 7 is attached. When using the fixing means 13, the operator attaches the bucket cylinder 3 to the first pin hole A at the most extended position and the fixing pin 12 is attached.
Is removed, and the bucket 4 and the extension arm 7 are fixed by reattaching to the second pin hole B, and the figure shows a state in which the bucket 4 and the extension arm 7 are integrated. Therefore, in the side view of the bucket front retracting posture of the second embodiment of FIG. 6, the bucket cylinder 3 is contracted from the state of FIG. 5 to rotate the bucket 4 together with the extension arm 7 to the front position around the fulcrum pin 9. After the movement, the chisel 19 is attached to the breaker 18 and the breaker work is performed.

In FIG. 7, the chisel 19 is attached to the breaker 18 in a posture in which the bucket 4 is rotated and retracted to the front position together with the extension arm 7 by the bucket cylinder 3.
FIG. 3 is a side view of the hydraulic excavator 1 showing a state in which breaker work is performed. When there is no obstacle in front of the vehicle body, the breaker work is performed in this posture, so that the operator's line of sight S from the eyepoint P does not interfere with the bucket 4 and the protrusion amount T of the chisel 19 is sufficient. It can be confirmed by the operator and work can be performed easily and safely.

When the fixing means 13 is used in FIG. 1, the operator pulls out the fixing pin 12 attached to the first pin hole A and replaces it with the third pin hole C at the most reduced position of the bucket cylinder 3. , The bucket 4 and the extension arm 7 are fixed, and the figure also shows a state in which the bucket 4 and the extension arm 7 are integrated. Therefore, in the side view of the bucket rearward retracting posture of the first embodiment of FIG. 8, the bucket cylinder 3 is extended from the state of FIG. 1 to rotate the bucket 4 together with the extension arm 7 to the rearward position about the fulcrum pin 9. After the movement, the chisel 19 is attached to the breaker 18, and the breaker work is ready to be performed.

FIG. 9 shows a second embodiment in which an extension arm is attached, and when the fixing means 13 is used, the operator attaches the fixing pin 12 attached to the first pin hole A at the most reduced position of the bucket cylinder 3. Pull out the third pin hole C
In this case, the bucket 4 and the extension arm 7 are fixed to each other by mounting the bucket 4, and the drawing is a side view showing a state in which the bucket 4 and the extension arm 7 are integrated. Therefore, in the side view of the bucket rearward retracting posture of the second embodiment of FIG. 10, the bucket cylinder 3 is extended from the state of FIG. 9 to rotate the bucket 4 together with the extension arm 7 to the rearward position around the fulcrum pin 9. After the movement, the chisel 19 is attached to the breaker 18, and the breaker work is ready to be performed. The side view of the second embodiment in which the fulcrum pin position in FIG. 11 is changed shows the arrangement of the pin hole of the fulcrum pin 9 which is the rotation center of the sublink 8 and the first pin hole A of the fixing pin 12 in FIG. This is an example in which the elements are replaced, but there is no functional change.

FIG. 12 shows a state in which the chisel 19 is attached to the breaker 18 and the breaker work is performed in a posture in which the bucket 4 is rotated and retracted by the bucket cylinder 3 together with the extension arms 7 to the rear position. It is a side view. If there is an obstacle in front of the vehicle,
Since the breaker work is performed in this posture, the operator's line-of-sight S from the eyepoint P is obstructed by the bucket 4, but the evacuation of the bucket 4 is large and the chisel 19
It is not necessary to remove the bucket 4, because the pop-out amount T is sufficiently secured and can be confirmed by the operator.

According to the respective side views of the bucket dump posture and the bucket excavation posture in the second embodiment with the extension arm 7 shown in FIGS. 9 and 5, the chisel 19 is shown.
Depending on the length selected, the chisel 19 remains attached to enable excavation work.

[0015]

As described above in detail, according to the present invention,
By making it a sub link that includes an extension arm and a bucket link with a sub push link,
The bucket can be saved a lot during breaker work, and the visibility of the chisel can be sufficiently improved without removing the bucket during breaker work. In addition to being useful for work safety, it is also possible to carry out bucket work with the chisel attached, which greatly improves work efficiency.

[Brief description of drawings]

FIG. 1 is a side view of a first embodiment with an extension arm attached, showing a bucket dump posture during bucket work.

FIG. 2 is a side view of a bucket excavation posture state during bucket work in the first embodiment with the extension arm attached.

FIG. 3 is a perspective view of an extension arm.

FIG. 4 is a side view of the breaker working state in which the bucket is retracted from the front side of FIG.

FIG. 5 is a side view showing a bucket fixed state at the bucket cylinder most extended position in the second embodiment of mounting the extension arm.

FIG. 6 is a side view of the breaker working state with the bucket retracted from FIG.

FIG. 7 is a side view of the hydraulic excavator in a work state of a breaker in a front of the bucket.

FIG. 8 is a side view of the breaker working state with the bucket retracted from FIG.

FIG. 9 is a side view showing the bucket fixed state at the bucket cylinder most contracted position in the second embodiment of mounting the extension arm.

FIG. 10 is a side view showing a breaker working state in which the bucket is retracted backward from FIG.

FIG. 11 is a side view of the second embodiment in which the position of the fulcrum pin is changed.

FIG. 12 is a side view of the hydraulic excavator in a breaker working state in the case where the bucket is retracted rearward.

FIG. 13 shows a breaker working state by a conventional hydraulic excavator with a built-in breaker arm.

FIG. 14 is a side view showing a bucket dump posture during a bucket work in the third embodiment with the extension arm attached.

[Explanation of symbols]

 1 Hydraulic excavator with built-in breaker 3 Bucket cylinder 4 Bucket 5 Push link 6 Bucket link 7 Extension arm 8 Sub link 9 Support point pin 10 Sub push link 12 Fixing pin 13 Fixing means 14 Arm bracket 18 Breaker 19 Chisel A 1st pin hole B 2nd pin hole C 3rd pin hole

Claims (4)

[Claims] 1. A hydraulic excavator with a built-in breaker arm (1)
At the breaker (18) or arm bracket (14) at the bucket (4), push link (5) and bucket link (6).
Fix the extension arm (7) attached at the tip, and transmit the movement of the bucket cylinder (3) via the sub link (8) and the sub push link (10) to perform excavation work.
During the breaker work, using the fixing means (13) that integrates the bucket (4) and the extension arm (7), the bucket (4) and the extension arm (7) that are integrated are centered on the fulcrum pin (9). Arm with built-in breaker, characterized in that it is retracted from the work point by the bucket cylinder (3) 2. A fixing pin (1) attached to the first pin hole (A) using the sub-link (8) provided with the second pin hole (B) or the third pin hole (C) as a fixing means (13). 12. The breaker built-in arm according to claim 1, wherein 12) is replaced and used. 3. Bucket cylinder (3) Bucket when extended
The second pin (B) is used as a fixing means (13) for the (4) and the extension arm (7).
Arm with built-in breaker. 4. The bucket cylinder (3) bucket when shortened
The third pin hole (C) is used as a fixing means (13) for the (4) and the extension arm (7).
Arm with built-in breaker.