JPS6233784Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an earth-moving machine in which an arm is rotatably connected to the tip of a boom and performs excavation, demolition, etc. with an attachment such as a bucket attached to the tip of the arm. This invention relates to an earthmoving machine in which a driving hydraulic cylinder is installed at the boom base of the earthmoving machine body, and the arm is driven through a link and a connecting rod.

Conventionally, as shown in Fig. 1, earthmoving machines such as power shovels are rotatably attached to the tip of a boom a with the middle of an arm b as a fulcrum, and there is a space between the upper end of the arm that protrudes above the fulcrum and the boom a. A hydraulic cylinder c for driving the arm is directly connected. Therefore,
The arm cylinder c protruded greatly above the boom a, and had a tendency to collide with surrounding obstacles and be damaged. In addition, since the tip a' of arm a protrudes above its rotational fulcrum, the entire length becomes longer, making it difficult to work in narrow spaces, and furthermore, the working range becomes narrower relative to the overall length of the arm. There were flaws.

The object of the present invention is to provide an earthmoving machine that can work in a narrow space without damaging the hydraulic cylinder or arm, and that allows the work range to be relatively wide with respect to the length of the arm.

Hereinafter, embodiments of the present invention will be described based on the drawings. Figures 2 and 3 are side views showing the structure of the main parts of the earth-moving machine according to the present invention. Figure 1 shows the case where bucket carts are connected in a backhoe style, and Figure 2 shows the case where bucket trucks are connected in a face style. shows. In the figure, 1 is a boom whose base 1a is pivoted to a civil engineering machine body (not shown) and is moved up and down by a boom driving hydraulic cylinder 2; 3 is an arm pivoted to the tip of the boom 1 via a pin 3'; Reference numeral 4 denotes an attachment that is pivotally attached to the tip of the arm 3 via a pin 4', and is a bucket belt in the illustrated embodiment.

In the present invention, the tip of the arm 3 is pivotally attached to the tip of the boom 1 via a pin 3' so that the arm 3 does not protrude above the boom 1, and is connected to the boom 1 so as to be rotatable back and forth.

A link 5 is pivotally attached to the middle of the boom 1 via a pin 5', and an arm 3
Bracket 3a integrally formed below the rotation fulcrum of
A connecting rod 6 has both ends connected to pins 6',
A hydraulic cylinder 7 is installed at the base of the boom 1 so as to be movable up and down along the boom axis, and a rod 7a of the hydraulic cylinder
is pivoted to the link 5.

Thus, the cylinder 7 provided at the bottom of the boom 1
The reciprocating motion of the rod 7a is transmitted to the link 5 and the arm connecting rod 6, and the arm 3 is configured to rotate relative to the boom 1.

The link 5 is preferably made of a substantially T-shaped member with an arcuate upper side as shown in the figure, and the upper rear end 5a
The cylinder rod 7a is connected to the cylinder rod 7a, and the rear end of the arm connecting rod 6 is connected to the front end 5b. Further, the link 5 has a relatively long shaft in order to increase the rotation angle of the arm 3, and its lower end is pivotably attached to the bracket 1b extending below the boom 1.

Although not shown in the drawings, the boom 1 is composed of a pair of left and right side plates welded together by a connecting plate 8, and the cylinder 2, link 5, arm connecting rod 6, etc. are arranged between these pair of side plates. .

The arm 3 similarly consists of a pair of left and right side plates integrally connected by a connecting plate 9, and a hydraulic cylinder 10 for driving the bucket 4 is built in between the side plates along the axis of the arm. The bucket bag 4 is rotated relative to the arm 3 via a link 11 and a connecting rod 12 pivoted to a stay 4a of the bag bag 4.

In Figure 2, the bucket is mounted facing backwards so that it can be operated like a bucket hoe, but since the bucket cylinder 10 is built into the arm 3, the bucket can be mounted facing forward as shown in Figure 3, and the arm By changing the ring 11 toward the rear, the bucket bag 4 can also be operated in a face-like manner. Moreover, in either case, the bucket cylinder 10 operates in the excavation direction during the extension stroke, so a strong force is applied during excavation.

As described above, in the present invention, the hydraulic cylinder 7 for driving the arm is attached to the lower part of the boom 1, and the arm 3 is rotated via the link 5 and the connecting rod 6. The tip of the arm does not protrude above the boom 1. Therefore, there is no risk that the arm cylinder 7 will be damaged by colliding with a falling object or an obstacle above, and work can be performed even in a space that is narrow in the vertical direction. Furthermore, since the tip of the arm 3 can be connected to the boom 1, if the overall length of the arm is the same as in the conventional example, the radius of movement from the fulcrum to the tip of the arm becomes large, thereby improving work efficiency.

[Brief explanation of the drawing]

Figure 1 is a side view of a conventional civil engineering machine;
FIG. 3 is a side view of an earth-moving machine according to an embodiment of the present invention. 1...Boom, 2,7,10...Cylinder, 3
...Arm, 4...bucket, 5...arm link, 6...arm link, 11...bucket link, 12...bucket link.

Claims (1)

[Scope of utility model registration request] In an earthmoving machine in which an arm is swingably connected to a boom and an attachment such as a bucket is pivotally attached to the tip of the arm, the tip of arm 3 is connected to boom 1.
A hydraulic cylinder 7 for arm driving is attached to the base of the boom 1, and a rod 7a of the cylinder 7 is pivoted to a link 5 rotatably attached to the middle of the boom 1. An earthmoving machine characterized in that the tip of a connecting rod 6 that is pivoted to a link 5 is pivoted to a bracket 3a provided below a swinging fulcrum of an arm 3.