JPH0715848U - Booster mechanism of work machine - Google Patents

Abstract

(57) [Summary] [Purpose] When excavating solid ground, etc., a boost can be obtained with a single movement. [Composition] In a working machine of a hydraulic excavator in which an arm is attached to the end of the boom and the arm can be rotated in the front-rear direction by expansion and contraction of an arm cylinder provided on the upper part of the boom. One end of a link is attached to the arm, the other end of the link is connected to the rod of the arm cylinder, and the rod end of the cylinder provided in the boom is connected to the link and the arm cylinder. Attached to the upper and lower parts,
Since the arm cylinder can be moved upward by extending the cylinder provided in the boom, the point of action of the pushing force of the arm cylinder with respect to the arm is moved upward to move by the arm. It is characterized by increasing the excavation power.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a booster mechanism for a working machine for increasing excavation force by an arm such as a hydraulic excavator.

[0002]

[Prior art]

 Hydraulic excavators currently in use are generally designed to work with their working machines such as booms, arms and buckets by expanding and contracting their respective cylinders. The power source of the working machine in such a hydraulic excavator is a hydraulic cylinder, but it is not possible to produce a force exceeding the capacity of the cylinder. Therefore, a boom and an arm of the same size as the conventional one is used to generate a force larger than necessary, for example, in Japanese Utility Model Publication No. 1-102239 and Japanese Utility Model Publication No. 3-32596. There is a boost mechanism shown.

[0003]

[Problems to be solved by the device]

 In the former case, however, a plurality of pin holes are formed in the upper part of the arm downward with appropriate intervals, and the positions of the end of the boom and the rod of the arm cylinder with respect to the arm hole are replaced by pins. Although it is installed to increase the excavation force, there is a problem that it takes time to replace the pins and it cannot be done with one touch. Also, the latter, when scooping up a solid ground, uses a cylinder separately attached so that the angle between the piston rod of the bucket cylinder and the first link located at the top of the bucket is 90 °, and the bottom side of the bucket cylinder is It is said that the scooping operation is facilitated by moving it by the maximum moment, but it is necessary to resist the spring force in the attached cylinder, and the pin on the bottom side of the bucket cylinder is located at the tip of the attached cylinder. There is a problem that it is difficult to move because the friction loss generated when sliding in the guide is large.

In view of this, the present invention aims to solve the drawbacks of the prior art by providing a booster mechanism for a working machine that can obtain a boost in one movement when excavating hard ground. It was made.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has an arm attached to the end of the boom, and the arm cylinder provided on the upper part of the boom allows the arm to rotate in the front-rear direction. In a shovel work machine, one end of a link is attached to the arm, the other end of the link is connected to a rod of the arm cylinder, and a rod end of a cylinder provided in the boom is connected to the link. The arm cylinder is attached to the rod connecting portion of the arm cylinder so as to be movable up and down, and the arm cylinder can be moved upward by extending the cylinder provided in the boom. The feature is that the point of action of the pushing force of the cylinder is moved upward to increase the excavating force by the arm.

[0006]

[Action]

 With the above construction, if the cylinder provided on the boom is extended, the arm cylinder moves upward, and the point of application of the pushing force of the arm can be moved upward, so the excavating force by the arm is increased. Can be increased.

[0007]

【Example】

 1 is an external side view of a hydraulic excavator equipped with an embodiment of a booster mechanism for a working machine according to the present invention, and FIG. 2 is a side view showing an embodiment of a booster mechanism of the main part of the present invention shown in FIG. 3 and 4 are plan views of FIG.

Hereinafter, the present invention will be described with reference to the embodiments shown in FIGS. The present invention is a hydraulic excavator in which an arm 3 is attached to the end of a boom 2 and an arm cylinder 4 provided on the upper part of the boom 2 expands and contracts to allow the arm 3 to rotate in the front-back direction. In this working machine 1, one end of the link 5 is rotatably connected to the arm 3 and the rod 4a of the arm cylinder 4 is rotatably connected to the other end of the link 5, and the link 5 and the rod 4a are connected. The cylinder 6 provided on the boom 2 is attached to the connecting portion so as to be vertically movable, and when the cylinder 6 is extended, the arm cylinder 4 moves upward and the pushing force of the arm 3 is increased. The point of action also moves upward, and the excavation force by the arm during excavation work increases.

FIG. 1 shows an external side view of a hydraulic excavator to which a booster mechanism of a working machine according to the present invention is applied. An arm 3 is rotatably provided at a tip of a boom 2 by a pin 7. A bucket 8 is attached to the tip of the arm 3, and the boom cylinder 9, arm cylinder 4 and bucket cylinder 10 are expanded and contracted to rotate for excavation work. 2 and 3 show the details of the mounting relationship between the boom 2 and the arm 3, and the arm 3 located at the extension of the rod 4a of the arm cylinder 4 (solid line) has a conventional structure. In the present invention, the mounting hole position is extended to the upper side, and one end of the link 5 is rotatable by the mounting pin 11. The other end of the link 5 is rotatable with the rod 4a of the arm cylinder 4 and the end of the rod 6a of the cylinder 6 rotatably mounted on the upper surface of the boom 2 on the bottom side by the same pin 12. It is connected. Although a hose, a pipe and the like for supplying oil to the cylinder 6 are not shown, they are arranged to pass through the boom 2 by a commonly known means.

Next, the operation will be described. In a normal excavation work, the cylinder 6 provided on the upper surface of the boom 2 is not operated, and therefore the arm cylinder 4 is contracted at the position indicated by the solid line, so that a component force acts on the link 5 placed obliquely. Then, the arm 3 is rotated back and forth about the pin 7 as a fulcrum. If, during excavation work, hard rock is encountered and normal excavation becomes difficult, the arm cylinder 4 will move from the position indicated by the solid line to the position above when the cylinder 6 is extended. 5 is substantially aligned with the axial direction of the arm cylinder 4. As a result, the pushing force of the rod 4a of the arm cylinder 4 is transmitted in the link direction and becomes almost perpendicular to the arm 3, so that the pushing force of the arm 3 is increased, and the excavation work of hard rock etc. Can be done easily.

Although the present invention has been described for the case where the booster mechanism is provided between the boom and the arm, the same effect can be obtained even when the booster mechanism is provided between the arm and the bucket. Of course, it can also be applied to other similar work machines.

[0012]

[Effect of device]

 As described above, according to the present invention, when the cylinder provided on the boom is extended, the arm cylinder moves upward and the point of application of the pushing force of the arm can be moved upward. The excavating force by the arm can be increased.

[Brief description of drawings]

FIG. 1 is an external side view of a hydraulic excavator equipped with an embodiment of a booster mechanism for a working machine according to the present invention.

FIG. 2 is a side view showing an embodiment of the booster mechanism of the essential part of the present invention shown in FIG.

FIG. 3 is a plan view of FIG.

[Explanation of symbols]

1 ... Working machine 2 ... Boom 3 ... Arm 4 ... Arm cylinder 4a ... Rod 5 ... Link 6 ... Cylinder 6a ... Rod

Claims (1)

[Scope of utility model registration request] 1. A working machine for a hydraulic excavator in which an arm is attached to the tip of a boom, and the arm can be rotated in the front-rear direction by expansion and contraction of an arm cylinder provided at the top of the boom. At, one end of the link is attached to the arm, and the other end of the link is connected to the rod of the arm cylinder,
A rod end of a cylinder provided on the boom is vertically movably attached to a rod connecting portion of the link and the arm cylinder, and the arm cylinder is extended by extending the cylinder provided on the boom. A booster mechanism for a working machine characterized in that the point of action of the pushing force of the arm cylinder with respect to the arm is moved upward to increase the excavating force of the arm because it is movable upward.