JPH06313322A - Hydraulic power shovel - Google Patents

Abstract

PURPOSE:To improve working ability in a narrow place by making the height of the upper end of a working machine lower at the time of its excavation and turning, and lessening the turning radius of the working machine in a low posture. CONSTITUTION:In a hydraulic power shovel having a working machine composed of a boom 2, an arm 3 and a bucket 4, the boom 2 is divided into first and the second booms 2A, 2B, and the base end of the first boom 2A is pivotally mounted on a revolvable frame 5, and the tip of the first boom 2A is pivotally mounted at the one end of the second boom 2B, and the arm 3 is pivotally mounted on the other end of the second boom 2B. The rod of the first boom cylinder 6 having its base end on the revolvable frame 5 and the rod of the second boom cylinder 7 having its base end on the revolvable frame 5 are severally connected to the middles of the first and the second boom 2A, 2B to form a link having four sections of the first boom 2A, the second boom 2B, the second boom cylinder 7 and the revolvable frame 5 for keeping the second boom 2B about horizontal at the highest position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic power shovel, and more particularly to a hydraulic power shovel which is suitable for underground excavation and has a low vehicle height and which can make a small turn.

[0002]

2. Description of the Related Art Generally, a hydraulic power shovel is used for excavating earth and sand in a place where there are no obstacles or the like on the upper part thereof, but the work range cannot be specified due to diversification of construction work in recent years. For example, hydraulic power shovels are being used for subway construction, sewage pipe burial, tunnel construction, etc.
-58654 and JP-A-60-159229.
Japanese Patent Laid-Open Publications and the like improve conventional hydraulic power shovels so that they are suitable for their respective applications.

[0003]

However, when the hydraulic power shovel is applied to a narrow site such as underground construction, the excavation height is determined by the height of the arm or bucket. It cannot be used in places with restrictions. Therefore, if the arm length is shortened, the excavation height is lowered, but the work reach becomes small. On the other hand, the one disclosed in Japanese Utility Model Laid-Open No. 2-101839 is suitable for a narrow space because it can make a small turn, but the height of the raised posture is very high. It cannot be used in places where the excavation height is limited. Further, in the one disclosed in Japanese Utility Model Laid-Open No. 60-58654, the arm is shortened, and the excavation height is reduced by a slide boom so that the excavation height is reduced.
Although it is designed to make a profit, there is a drawback that the turning radius becomes large during a small turning with the height restricted. Further, the one disclosed in Japanese Patent Application Laid-Open No. Sho 60-159229 has a lower top height when the boom is raised by forming the boom and the arm by two pieces of the original and the former respectively. However, it is stated that the reach length of the tip of the combination of the boom and the arm can be set to a large length during excavation. Therefore, the purpose is to make a reach, but the operation is independent and It was not possible to make a small turn under the height restrictions, so it was not suitable for excavation work underground.

In view of this, the present invention reduces the height of the upper end of the working machine during excavation or turning, and reduces the turning radius of the working machine in a low posture to improve workability in a narrow space. The purpose of the present invention is to provide a hydraulic power shovel capable of removing the drawbacks of the prior art.

[0005]

In order to achieve the above object, the first aspect of the present invention is to provide a hydraulic power shovel having a working machine including a boom, an arm and a bucket.
The boom is divided into a first boom and a second boom,
The proximal end of the first boom is pivotally attached to the levo frame, and the distal end thereof is the second.
A first boom is pivotally attached to one end of the boom, an arm is pivotally attached to the other end of the second boom, and a proximal end of the levo frame is provided in the middle of the first boom. The rod side of the cylinder
The first boom, the second boom, the second boom cylinder, and the revoframe are connected to the rod side of a second boom cylinder having a base end on the revoframe in the middle of the boom. And 4 form a four-bar link to hold the second boom substantially horizontally at the highest position. Claim 2 is the same as claim 1, wherein the second boom is slidable inside and outside. It is characterized in that the rod side of the second boom cylinder is connected to either one of the inner and outer booms.

[0006]

According to the above construction, in claim 1, a small turn can be made in a low posture, and in claim 2, in addition to claim 1, high reach work can be performed.

[0007]

1 is a side view of an embodiment of a hydraulic power shovel according to claim 1 of the present invention, and FIG. 2 is a first buoy of FIG.
2 is a state diagram in which the first boom of FIG. 2 is tilted forward, FIG. 4 is an operation diagram showing a process of excavating the hydraulic power shovel of FIG. 1, and FIG. FIG. 6 is a side view of an embodiment of the hydraulic power shovel according to claim 2 of the present invention.
Is a plan view showing a working range of the hydraulic power shovel according to claim 2, and FIG. 7 is a side view of another embodiment of the supporting portion of the second boom according to claims 1 and 2 of the present invention. is there.

The present invention will be described below with reference to FIGS. 1 to 7. According to claim 1 of the present invention, in a hydraulic power shovel 1 provided with a working machine including a boom 2, an arm 3 and a bucket 4, the boom 2 is replaced by a first boom 2A and a second boom 2A. It is divided into booms 2B, and the base end of the first boom 2A is pivotally attached to the revoframe 5 and the tip is pivotally attached to one end of the second boom 2B to form the second boom 2B. An arm 3 is pivotally attached to the other end of the first boom 2A, and a rod side of a first boom cylinder 6 having a base end of the revoframe 5 is located in the middle of the first boom 2A.
The rod side of a second boom cylinder 7 having a base end on the revoframe 5 is connected to the middle of the boom 2B, and the first boom 2A, the second boom 2B, and the second boom are connected. A four-bar link is formed with the cylinder 7 and the revo frame 5,
The second boom 2B is constructed so as to be held substantially horizontally at the highest position, and in claim 2, in claim 1, the second boom is slidable as shown in FIG. The inner and outer booms 2a, 2 are divided into the booms 2a, 2b.
It is constituted by connecting the rod side of the second boom cylinder 7 to either one of b.

In the hydraulic power shovel 1, an upper revolving structure 9 is rotatably mounted on a lower traveling structure 8 and the upper revolving structure 9 is rotated.
The revolving frame 5, the cab 10 and the working machine are arranged on the upper surface of the. The base end of the first boom 2A is connected to the revo frame 5 by a pin 11, and the first boom 2A
The bottom part of the bottom end of the revo frame 5 is pin 12
The rod side of the first boom cylinder 6 connected by the above is connected by a pin 13. The tip of the first boom 2A is connected to one end of the second boom 2B by a pin 14,
The other end of the boom 2B is connected to the arm 3 by a pin 15. A bucket 4 is connected to the tip of the arm 3. The bottom side base end of the second boom cylinder 7 for moving the second boom 2B is attached to the revo frame 5 by a pin 16
The rod side of the second boom cylinder 7 is connected to the intermediate portion of the second boom 2B by a pin 17 to connect the first boom 2A, the second boom 2B and the second boom. A four-bar link is formed by the cam cylinder 7 and the revo frame 5. As a result, the extension of the first cylinder 6 causes the second boom 2 to move.
Even if B is inclined downward from the horizontal position on the arm 3 side, it is not inclined upward. An arm cylinder 18 is provided between the second boom 2B and the arm 3.
However, a bucket cylinder 19 is provided between the arm 3 and the bucket 4, and the opening angle between the arm 3 and the second boom 2B increases or decreases when the arm cylinder 18 expands or contracts. However, the bucket 4 is excavated or dumped by the expansion and contraction of the bucket cylinder 19.

FIG. 5 shows claim 2 of the present invention.
Is different from the second boom 2B in FIG. 1 in that it is a slide type. Therefore, the same parts as those in FIG. 1 are designated by the same reference numerals as those in FIG. 1, and the description thereof will be omitted. Only different parts will be described. The second boom is divided into an inner boom 2a and an outer boom 2b, and the inner boom 2a is slidably fitted in the outer boom 2b. In the case of the embodiment, The outer boom 2b is connected to the arm 3 by a pin 15, and the inner boom 2a is connected.
Is connected to the first boom 1A by a pin 14. In this case, the rod end of the second boom cylinder 7 is connected to the inner boom 2a and interferes when sliding with respect to the outer boom 2b, so that the outer boom 2b is not interfered with. There is a notch to prevent it.

Next, the operation will be described. FIG. 1 shows the posture when turning, and in this example, the height is kept to a few meters, and it is possible to make a full turn with a working machine turning radius of 2.5 m in front. When excavating at an underground construction site, etc.
After extending the boom cylinder 6 to raise the first boom 2A, the boom cylinder 6 is tilted forward as shown in FIG. At this time, the first boom 2
A, second boom 2B, revo frame 5, and second boom
The second boom 2B is pushed forward while keeping the horizontal state because it is a four-bar linkage with the boom cylinder 7, but the second boom cylinder 7 is contracted and the arm cylinder 18 is further extended. By doing so, the bucket 4 at the tip of the arm 3 can be brought into contact with the ground at the position a as shown by the two-dot chain line in FIG. From this state a, bucket 4
Move and excavate like b → c → d, but always the second
Even if the boom 2B is lowered from the horizontal state, it is not raised, so that the excavation work can be performed while suppressing the excavation height. In FIG. 5, in order to further extend the reach, the outer boom 2b of the second boom is slid from the inner boom 2a to form a high reach as shown by a chain double-dashed line. This allows the bucket 4 to be extended in the direction away from the vehicle body for excavation. To show this in concrete numbers, for example, in the underground site, the height is 2.
If there is an intermediate stake I with a 5m beam, 2500 from the center of the car body
Even within the turning range of mm, turning can be performed without interfering with the intermediate pile I. The working range of claim 2 is 6500 mm.
Therefore, even in the case of claim 1 in which the vehicle is slightly advanced, the intermediate pile I
It is possible to perform work up to 5600 mm that interferes with, and even at that time, the turning radius of 2500 mm does not interfere with the intermediate pile I.
Therefore, work can be performed with a margin. The specific numerical values described above show only one example, and the present invention is not limited to this, and it goes without saying that various examples can be obtained by changing the design.

FIG. 7 shows the first boom cylinder 6 and the second boom cylinder 7 in FIG. 5 (including FIG. 1) and the first boom 2A and the second boom 2B (2a, 2b). This shows another embodiment in which the connecting position is changed, and the effect is the same as that of FIG. 5 (including FIG. 1).

[0013]

As described above, according to claim 1 of the present invention, in a hydraulic power shovel having a working machine including a boom, an arm and a bucket, the boom is the first boom. And a second boom, and the base end of the first boom is pivotally attached to the levo frame and the tip end is pivotally attached to one end of the second boom. A first arm having an arm pivotally attached to the other end and having a base end on the revoframe in the middle of the first boom.
The rod side of the boom cylinder is connected to the rod side of a second boom cylinder having a base end on the revo frame in the middle of the second boom, respectively, and the first boom and the second boom are connected. ,
The second boom cylinder and the revo frame form a four-bar link to hold the second boom substantially horizontally at the highest position. Since the rod side of the second boom cylinder is connected to one of the inner and outer booms by dividing into the slidable inner and outer booms, the normal underground excavation is performed by using a beam or the like at the upper part in claim 1. Even if the height is limited and the lateral side is an intermediate pile and the radius at the time of turning is limited, the workability can be significantly improved. In claim 2, a high reach is realized in addition to claim 1. can do.

[Brief description of drawings]

FIG. 1 is an explanatory side view of an embodiment of a hydraulic power shovel according to claim 1 of the present invention.

FIG. 2 is an explanatory diagram showing a state in which the first boom of FIG. 1 is raised.

FIG. 3 is an explanatory view showing a state in which the first boom of FIG. 2 is tilted forward.

4 is an operation explanatory view showing a process of excavation of the hydraulic power shovel shown in FIG. 1. FIG.

FIG. 5 is an explanatory side view of an embodiment of the hydraulic power shovel according to claim 2 of the present invention.

FIG. 6 is an explanatory plan view showing a working range of the hydraulic power shovel according to claim 2;

FIG. 7 is a second aspect of the present invention.
It is explanatory drawing by the side of the other Example of the support part of a boom.

[Explanation of symbols]

 1 Hydraulic Power Shovel 2 Boom 2A 1st Boom 2B 2nd Boom 2a Inner Boom 2b Outside 〃 3 Arm 4 Bucket 5 Revo Frame 6 1st Boom Cylinder 7 2nd Bum − Mu cylinder

Claims (2)

[Claims] 1. A hydraulic power shovel having a working machine including a boom, an arm, and a bucket, wherein the boom is divided into a first boom and a second boom. First
The base end of the boom is pivotally attached to the levo frame, and the tip is attached to the second boom.
Of the first boom cylinder, which is pivotally attached to one end of the second boom and the arm is pivotally attached to the other end of the second boom, and which has a base end at the rev frame in the middle of the first boom. The rod side is the second
The first boom is connected to the rod side of a second boom cylinder having a base end in the revoframe in the middle of the frame.
Boom, second boom, second boom cylinder and rev frame
The hydraulic power is characterized in that the second boom is held substantially horizontally at the highest position by forming a four-bar link with the boom.
Shovel. 2. The second boom is divided into slidable inner and outer booms, and the rod side of the second boom cylinder is connected to either one of the inner and outer booms. The hydraulic power shovel according to claim 1.