JPH0124210Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a boom structure of a backhoe working section installed in a hand dozer.

Conventionally, the boom structure of the backhoe working section installed on hand dozers has a roughly rectangular cross-sectional shape, and the boom support and boom rotation hydraulic cylinder are attached to the outside of the boom, making the overall length of the machine longer. The drawback was that it was difficult to turn around.

In this invention, the boom cross-section is formed into a substantially U-shape with an opening in the front direction, and a boom support body and a boom rotation hydraulic cylinder that pivotally support the boom base end in the stored state are disposed in the opening. It is an object of the present invention to provide a boom structure for a backhoe working part that can shorten the overall length of the machine and enable the hand dozer to make small turns.

An embodiment of this invention will be described in detail based on the drawings. Fig. 1 shows a hand dozer/backhoe combination working machine in which a backhoe working part B is connected to the front end of the hand dozer A. , an engine 3 is mounted on the front part of the fuselage frame 2 equipped with a crawler-type traveling device 1,
The power is transmitted to a transmission 5 connected to the rear of the frame 2 via a belt transmission device 4, and is transmitted to a drive wheel 6 below the transmission 5 via the transmission 5, and the drive wheel 6 and the fuselage. frame 2
The hand dozer A is configured so that power is transmitted to an endless crawler 9 surrounding the outer periphery of an idler wheel 7 connected to the front end and a large number of rolling wheels 8 arranged on the lower surface of the frame 2, thereby causing the hand dozer A to travel. At the rear of the mission 5, an operating section 10 for operating a hand dozer A and a backhoe working section B is provided in series. In addition, 1a is a crawler type traveling device 1
The running frame is shown. A soil removal plate 11 is connected to the front of the fuselage frame 2 so as to be able to be raised and lowered, and a mounting plate having a substantially triangular planar shape and protruding forward is provided at the front end of the frame 2 to support the backhoe working section B. A boom support 13 is attached to a vertical pivot 14 at the front end of the platform 12.
It is pivotally connected to the left side of the fuselage frame 2 via a link mechanism 16 that is interlocked and connected to a connecting part 15 that protrudes leftward from the left side of the support 13. The support body 13 is configured to be rotated left and right by the expansion and contraction of a horizontal rotation hydraulic cylinder 17 provided therein, and the support body 13 has an opening 13- at its rear when viewed from the side.
1, it is formed into a substantially U-shape, and the mounting base 12
It is configured to hold the front end of the

The front part of the boom support 13 has a substantially triangular shape in side view, and a boom pivot 13-6 is provided at the front end of the boom support 13. A horizontal pivot 18 is attached to the boom pivot 13-6. Insert horizontally, coaxial 1
The boom base 19- can be moved up and down about 8.
1 are pivotally connected.

Furthermore, the boom 19 has a substantially U-shaped cross section with an opening 19-2 at the rear, and the boom support 13 is housed in the base 19-1 of the boom, and the left and right side surfaces 13-2 of the support 13 are 2, 13-3 and the front 13-4 to the left and right side plates 19-3, 1 of the boom 19.
9-4 and the front surface 19-5.

Further, a cylinder head pivot portion 13-5 is formed at the upper end of the boom support 13, and a boom tip pivot 20 provided at the tip of the boom 19,
A boom rotation hydraulic cylinder 21 is provided between the pivot portion 13-5, and the boom 19 is moved up and down about the horizontal pivot 18 of the boom support 13 by the expansion and contraction of the cylinder 21. It is composed of

The hydraulic cylinder 21 is housed in a boom 19, and the boom 19 has a substantially elongated triangular side surface, and the lower surface of the boom has a substantially semicircular arc shape to avoid contact with the boom support 13 when the boom is upright. Notch 1
3a, and the middle part of an arm 22, which is held in place by the left and right side plates 19-6 and 19-7 of the boom 19, is pivotally connected to the tip of the boom 19 through the intervention of a boom tip pivot 20. , an arm rotation hydraulic cylinder 24 installed between a bracket 23 erected on the rear upper edge of the boom 19 and the rear end of the arm.
The arm 22 is configured to move up and down by the expansion and contraction operation of the arm 22, and a bucket 26 is pivotally connected to the tip of the arm 22 so as to be vertically movable by a bucket rotating hydraulic cylinder 25. The bucket cart 26 is rotated by the expansion and contraction of each hydraulic cylinder to perform the bucket hoe work.

The embodiment of this invention is constructed as described above, and the power of the engine 3 is transmitted to the traveling device 1 to make the hand dozer A travel, and also to drive the earth removal plate 1.
The boom 1 is raised and lowered to perform earth removal work, and the hydraulic cylinders 17, 21, 24, and 25 are operated to expand and contract as appropriate by operating the operation unit 10.
The boom 9, the arm 22, and the bucket 26 are moved up and down to perform bucket hoe work.The boom support 13 and the boom rotation hydraulic cylinder 21 are inserted and stored in the boom opening 19-2. In this state, the downward rotation of the arm 22 by the boom rotation hydraulic cylinder 21 is not obstructed, and the overall length of the aircraft body is shortened, making it possible to make small turns. Protects from obstacles.

According to this invention, the boom of the backhoe working part installed in the hand dozer is configured to have a substantially U-shaped cross section with a forward opening, and the boom pivot part of the boom support and the boom rotation hydraulic cylinder are housed in the opening. This has the effect of shortening the overall length of the fuselage, improving turning radius, and protecting the boom rotation hydraulic cylinder from external obstacles.

[Brief explanation of the drawing]

Fig. 1 is a side view of the entire hand dozer/backhoe working machine, Fig. 2 is a rear view of the main parts, and Fig. 3 is a sectional view of Fig. 2. A: Hand dozer, B: Backhoe work section,
13: Boom support, 19: Boom, 19-1:
Boom opening, 20: Boom rotation hydraulic cylinder.

Claims (1)

[Claim for Utility Model Registration] The boom 19 of the backhoe working section B is attached to the front part of the fuselage frame 2 via the boom support 13 so as to be movable up and down, and the cross-sectional shape of the boom 19 is arranged so that the opening 19 faces toward the rear. Furthermore, within the boom 19, a boom pivot portion 13-6 of the boom support 13 and a boom rotation hydraulic cylinder 21 for rotating the boom 19 upward are provided. A boom structure for a backhoe working section, characterized in that the base of the boom rotation hydraulic cylinder 21 is pivotally connected to the boom pivot portion 13-6.