JPS6248017B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a working machine device for performing break-in work.

Work equipment needs to have the ability to escape when overloaded, and to be able to store it when not in use. Conventionally, two methods have been considered, as shown in Figures 1 and 2. .

One is the hydraulic cylinder b that operates the arm of the work equipment.
An accumulator d is connected to the head side of the rod, and a hydraulic cylinder b is operated to relieve the overload by the accumulator d, and when storing the work implement a, the hydraulic pressure is sent to the rod side. However, the following problems can be considered.

(1) It is difficult to buffer work equipment a at a desired height.

(2) The entire device becomes larger.

(3) Hydraulic cylinder b becomes large with a large stroke.

(4) Extra output is required because accumulator d is activated when stored.

Also, as shown in Figure 2, a four-bar link e is attached to the work machine a.
, a hydraulic cylinder f is provided inside the hydraulic cylinder f, an accumulator d is provided on the rod side of the hydraulic cylinder f, the overload is escaped by the accumulator d, and the hydraulic cylinder f is operated to store the working machine a, as follows. There was a problem.

(1) It is difficult to buffer the work equipment at a desired height.

(2) Extra output is required since accumulator d is activated when stored.

The present invention was made in view of the above circumstances, and its purpose is to make it possible to downsize the hydraulic cylinder, to buffer the working machine at any height, and to eliminate the need for extra output. Our goal is to provide work equipment.

Hereinafter, the present invention will be explained with reference to FIG. 3 and subsequent figures.

In the drawing, reference numeral 1 denotes a support part like a truck, and an upper bracket 8 and a lower bracket 9 are fixed to the support part 1. The base end of the upper arm 3 and the upper end of the buffer arm 5 are connected to the pin 1 in the upper bracket 8.
It is mounted so that it can swing at 0. The base end of the upper arm 3 is attached to the upper part of the working machine 2 with a pin 11.

The base end of the lower arm 4 is attached to the lower bracket 9 with a pin 13, and the tip end of the lower arm 4 is attached to the lower part of the working machine 2 with a pin 12.

A support bracket 16 is fixed to the support part 1, and the proximal end of the buffer cylinder 7 is attached to the support bracket 16 with a pin 14, and the rod 25 of the buffer cylinder 7 is attached to the lower end of the buffer arm 5. They are connected by pin 17. Further, the base end of the hydraulic cylinder 6 is attached to the lower end of the buffer arm 5 by this pin 17, and the rod 26 of the hydraulic cylinder 6 is attached to the lower end of the buffer arm 5.
is attached to the upper part of the working machine 2 with the pin 11.

The support portion 1, upper and lower arms 3 and 4, and the working machine 2 constitute a four-bar parallel link A.

The rod side of the buffer cylinder 7 is connected to an accumulator 27 via a conduit, and the head side of the buffer cylinder 7 is connected to a tank 28.
These constitute a buffer mechanism B.

29 in the drawing is a hydraulic circuit of the hydraulic cylinder 6, and this hydraulic circuit 29 includes a pump 30 and a control valve 3.
1. Check valves 32 and 33 are provided.

Next, the operation will be explained.

(1) When the work equipment is buffered When an upward force is applied to the tip of the work equipment 2, the 4-section parallel link A will cause a shock as shown in Figure 3.
The center point B of the pin 11 on the top of the work machine 2 is centered on the point.
moves to B′. For this purpose, the hydraulic cylinder 6
is pulled, and point A moves to A' centered on point C. The buffer cylinder 7 is thus stretched and stretched. In other words, △ABC is rotated around point C without changing its shape.

When the buffer cylinder 7 is extended, the oil on the rod side escapes to the accumulator 27, so the work machine 2
overload will be buffered.

(2) When storing the work equipment In this case, extend the hydraulic cylinder 6 and lift it using the 4-bar parallel link A.

As the buffer mechanism B, the above-mentioned buffer cylinder 7 is used.
The ninth
The spring 41 may be used as shown in the figure, or the first
As shown in FIG. 1, the spring 34 may be housed in the rod side of the buffer cylinder 7, or as shown in FIG. It may be of a structure in which the side is connected to the discharge side of the pump 36 and a relief valve 37 is provided on the discharge side of the pump 33.

The working machine device C according to the present invention can be installed in a leveling machine D for leveling the underwater bottom, as shown in FIGS. 13 and 14.

That is, the working machine device C is attached to a cart 40 that moves on a frame 39 provided with an outrigger 38.

Therefore, when a large reaction force F is applied to the work equipment 2, the work equipment 2 is automatically released to reduce the reaction force, and the break-in is completed by repeating the work several times (see Figure 15). ).

As described in detail above, the present invention provides the working machine 2 on the support part 1 via the four-bar parallel link A, and the buffer arm 5 is attached to the shaft support of the upper arm 3 of the four-bar parallel link A to the support part 1. The end of the shock absorbing arm 5 is connected to the shaft support of the upper arm 3 to the working machine 2 by a hydraulic cylinder 6, and a connecting portion between the shock absorbing arm 5 and the hydraulic cylinder 6 is formed. The buffer mechanism B
Since the work implement 2 is connected to the support part 1 via the buffer mechanism B, overload acting on the work implement 2 is buffered by the buffer mechanism B, and the work implement 2 can be stored by operating the hydraulic cylinder 6. The hydraulic cylinder 6 can be made smaller, and the working machine 2 can be set to an arbitrary height by the hydraulic cylinder 6, and overload can be buffered in this state.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of the configuration of a conventional working machine device, Figure 3 is a side view of an embodiment of the present invention, Figure 4 is a plan view of the same, and Figure 5 is an explanation of the configuration of a four-bar parallel link. Fig. 6 is an explanatory diagram of the structure of the buffer link, Fig. 7 is an explanatory diagram of the structure of the buffer mechanism, Fig. 8 is an explanatory diagram of the circuit of the hydraulic cylinder, and Fig. 9 is a side view of another embodiment of the present invention. , Fig. 10 is an explanatory diagram of the same effect, Fig. 11, Fig. 1
2 is an explanatory diagram of the configuration of another embodiment of the buffer mechanism, FIG. 13 is a plan view of the leveling machine, FIG. 14 is a side view of the same, and FIG. 15 is an explanatory diagram of the leveling work. 1 is a support part, 2 is a work machine, 3 is an upper arm, 5
is a shock absorbing arm, 6 is a hydraulic cylinder, A is a four-bar parallel link, and B is a shock absorbing mechanism.

Claims (1)

[Claims] 1. A working machine 2 is provided on the support part 1 via a four-bar parallel link A, and a buffer arm 5 is swingably attached to the shaft support of the upper arm 3 of the four-bar parallel link A to the support part 1. The end of the upper arm 5 and the shaft support of the upper arm 3 to the working machine 2 are connected by a hydraulic cylinder 6, and the connecting part between the buffer arm 5 and the hydraulic cylinder 6 is supported via a buffer mechanism B. A working machine device characterized in that it is connected to a portion 1.