JPH078628Y2 - Front frame undulation device for excavators - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention supports a leader such as a pile driver and an excavator,
In addition, the present invention relates to a front frame undulating device for adjusting the excavation position (working radius).

[Prior Art] Conventionally, there are a boom suspension type as shown in Fig. 3 and a leader suspension type as shown in Fig. 4 in the excavator for suspending the kerry bar 24 having the excavation bucket 25 attached to the lower end. In the former boom suspension type, the excavation position (working radius) is adjusted by the elevation of the boom 7'and the front frame 3, and the elevation of the boom 7'is the elevation rope 8'by the boom elevation drum 5 '. It was carried out by winding and unwinding, and the elevation of the front frame 3 was performed by a hydraulic cylinder 15 'arranged between the front frame tip and the mast top. Also, in the latter leader suspension type, the excavation position (working radius) is adjusted by the elevation of the front frame 3, and the elevation of the front frame is between the tip of the front frame and the top of the mast as in the boom suspension type. It was carried out by the hydraulic cylinder 15 'arranged at.

[Problems to be solved by the present invention] However, both of them have a hydraulic cylinder 15 'for raising and lowering the front frame 3, which requires a stroke of several meters because it is necessary to raise the front frame 3 from the ground level during disassembly and assembly. Therefore, an expensive and heavy hydraulic cylinder had to be used.

In order to solve this, it is possible to raise and lower the front frame 3 with a raising and lowering rope and a raising and lowering drum, but in the boom suspension type shown in FIG.
In addition to the elevation rope 8'and the elevation drum 5'for raising and lowering, the elevation rope and the elevation drum for raising and lowering the front frame 3 are required, which is difficult in terms of space, and as shown in FIG. Even in the leader suspension type, when the elevation of the front frame is performed with the elevation rope, there is a problem that it is difficult to position the excavation position (working radius) because the front frame is not fixed by the rope support.

This invention has been made in view of the above facts, and its purpose is to make the front frame supporting the leader movable up and down by the vertical rope and the vertical drum, and to fix the front frame by the hydraulic cylinder and the multistage telescopic stay. In addition, the excavation position (working radius) can be easily positioned.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, a front frame undulating rope is hung between a front frame tip portion and a mast tip portion via a sheave or a pendant rope, and a cylinder is used. And the multi-stage telescopic stays are installed side by side, and the front frame is raised by the front frame undulating rope and the hoisting winch.The front frame is fixed by the hydraulic cylinder and the multi-stage telescopic stays, and the positioning fine adjustment of the excavation position (working radius) is performed. , Which can be performed by a hydraulic cylinder.

[Embodiment] The construction of the present invention will be described with reference to the embodiments shown in FIGS.

In the figure, 1 is an upper revolving structure, which is mounted on a lower traveling structure 2 so as to be revolvable. A front frame 3 is pivotally attached to the front part of the upper revolving structure 1 so as to be able to move upward and downward, and a kerry bar winding winch 4 and a front frame undulating winch 5 are arranged in a substantially central part of the upper revolving structure. A mast 6 is attached to the side.

The lower end of the leader 7 is supported on the front side of the front end of the front frame 3, and the front frame hoisting rope 8 fed from the front frame hoisting winch 5 is a sheave 10a of a bail 10 pivotally attached to the tip of the mast 6 by a shaft 9.
And the end of the front frame 3 has a pin 11
And the bridle attached to one end of the pendant rope 13 connected to the link 12.
After being wound around 14 sheaves 14a, it is attached to the bail 10 (or the upper swing body 1).

A hydraulic cylinder is provided at the lower end on the rear side of the front end of the front frame 3.
One end of 15 is pivotally attached by a pin 16, and one end of a multi-stage telescopic stay 17 is fixedly attached to the other end of the cylinder 15, and the other end of the multi-stage telescopic stay is rotated by a shaft 9 at the tip of the mast 6. Possibly pivoted.

Further, a hydraulic cylinder 18 is pivotally attached to the upper part on the rear side of the front end of the front frame 3 by a pin 11 to which the link 12 is attached, and one end of a stay 19 is fixedly attached to the other end of the hydraulic cylinder 18. The other end of 19 is pivotally attached to a lug 7a which is provided so as to protrude substantially in the center of the leader 7.

The kelly bar winding rope 20 fed from the kerry bar winding winch 4 includes sheaves 21 attached to a lug 7b projecting from the leader 7 and a sheave 21 provided at the upper and lower ends of the leader 7 slightly below the lug 7a. The innermost cylinder 24a of the kelly bar is connected via 22,23 to the upper end of the innermost cylinder 24a, and the excavation bucket 25 is attached to the lower end of the innermost cylinder 24a.

The leader 7 is provided with a bracket 26 that supports the upper end of the outermost cylinder 24b of the kelly bar 24 and a drive unit 27 that rotates the kerry bar 24 so as to be slidable in the vertical direction of the leader 7.

[Operation] Next, the operation of the present invention will be described.

First, at the time of assembly, when the tip of the front frame 3 is in contact with the ground (the state shown in FIG. 2A), the front frame hoisting rope 8 is extended from the front frame hoisting winch 5 by a considerable length, and the multi-stage telescopic stay 17 also. It is in the most extended state.

From this state, when the front frame up and down rope 8 is wound by the front frame up and down winch 5, the multi-stage telescopic stay 17 is also shortened and the front frame 3 is lifted. The front frame 3 is lifted up to a position where the leader 7 can be mounted, the leader 7 is mounted, the front frame undulating rope 8 is further wound up to a predetermined workable position, and the front frame 3 is erected. State.

In this state, that is, in the state where the multistage telescopic stay 17 is contracted to a predetermined length, the multistage telescopic stay 17 is fixed to a constant length by a fixing means such as a pin, and the excavation position (working radius) is finely adjusted by the hydraulic cylinder 15. This is done by raising and lowering the front frame 3 by expanding and contracting. At that time, the hydraulic cylinder 15
The front frame hoisting rope 8 is unwound and stretched from the front frame hoisting winch 5 by an appropriate length so as to allow extension.

Next, at the time of disassembling, first, the loosened front frame undulating rope 8 is wound up to such an extent that tension is applied, and the fixing means that fixes the multi-stage telescopic stay 17 to a fixed length is unwound and stretchable.

From this state, the front frame hoisting rope 8 is extended to move the front frame 3 downward, and the multi-stage telescopic stay 17
To stretch. When the attachment such as the leader 7 is grounded, the attachment is removed from the front frame 3.

[Effect] According to the present invention, the front frame undulating rope is hung between the front frame tip portion and the mast tip portion via the sheave or the pendant rope, and the hydraulic cylinder and the multi-stage telescopic stay are attached to the front frame undulating rope. By arranging them side by side, since the elevation of the front frame 3 can be performed by the two systems of the front frame hoisting rope 8 and the hydraulic cylinder 15, the front frame 3 is raised by the front frame hoisting rope 8 and the excavation position ( Fine adjustment of the working radius) is a hydraulic cylinder
Not only is it easy to position the excavation position, it is not necessary to use an expensive hydraulic cylinder with a stroke of several meters conventionally required to cause the front frame,
It has a remarkable effect on workability and economy.

[Brief description of drawings]

FIG. 1 is an overall side view of an excavator equipped with a front frame undulating device according to the present invention, FIG. 2 is a side view of a front frame undulating device according to the present invention, and FIGS. 3 and 4 are side views of a conventional example. Is. 1: Upper revolving structure 2: Lower traveling structure 3: Front frame 4: Keriva winding winch 5: Front frame up / down winch 6: Mast 7: Leader 8: Front frame up / down rope 10: Bail 13: Pendant rope 14: Bridle 15: Hydraulic cylinder 17: Multi-stage telescopic stay

Claims (1)

[Scope of utility model registration request] 1. A front frame tip of a front frame of an excavator or the like in which a leader is supported on a front portion of an upper swing body and a front frame for adjusting an excavation position is pivotally mounted so as to be able to move up and down, and a mast is attached to the rear of the upper swing body. A front frame hoisting rope is laid between the end portion and the mast tip through a sheave or a pendant rope, and a hydraulic cylinder and a multi-stage telescopic stay are installed side by side on the front frame hoisting rope. Front frame undulation device.