JPH0791082A - Working device having working arm - Google Patents

Abstract

PURPOSE:To prevent the occurrence of trouble during working by moving a hydraulic cylinder with the opening and closing of a working arm for reducing the outward exposure of a piston rod. CONSTITUTION:When working arms 1a, 1b are in an open state and cylinders 2a, 2b are located so as to be V-shaped, oil pressure is supplied to push out piston rods 3a, 3b for rotating the working arms 1a, 1b centering around an arm pin 6. The hydraulic cylinders 2a, 2b thereby press the working arms 1a, 1b as they rotate centering around a cylinder pin 7, and the working arms 1a, 1b turn into a closed state when they rotate to the positions of the cylinders 2a, 2b and become horizontal. The positions of clevis pins 4a, 4b move horizontally as far as the distance of X+Y while the working arms 1a, 1b change from a closed state into an open one, but the piston rods 3a, 3b move horizontally as far as the distance of X without extrusion, and their strokes therefore become shorter to shorten their outward exposed part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working device having a working arm, and in particular, for dismantling and removing reinforced concrete, road surface asphalt, etc., by crushing, cutting,
A work device having a work arm for crushing, for example,
Regarding a crusher and a cutting machine.

[0002]

2. Description of the Related Art When dismantling and removing reinforced concrete structures, asphalt, etc. on the road surface, dismantling and work were performed by a construction method by impact, but this causes violent vibration and noise, causing pollution problems. Therefore, in order to prevent such a problem from occurring, a device for sandwiching and destroying reinforced concrete and asphalt by a work arm is used, and Japanese Utility Model Publication No. 57-6693 has been proposed as a technique related thereto. In this prior art, as shown in FIG. 5, two arms (1) are supported on a side plate of a frame (10) by pins (6) so as to be openable and closable, and both arms (1) are opened and closed at their base ends. The hydraulic cylinders (2) that are driven to operate are connected by pins (4). Fracturing teeth 5 are provided at the tips of both arms (1) so as to face each other. In addition, the frame (1
0) is provided with several buffer plates (18).

[0003]

In the prior art shown in FIG. 5, the hydraulic cylinder (2) for driving the working arm (1) to open and close is arranged horizontally, and the working arm (1) is opened and closed. Depends on the stroke length of the piston rod of the hydraulic cylinder (2), and requires the stroke length of the piston rod corresponding to the opening / closing size of the working arm (1). for that reason,
The portion of the piston rod of the hydraulic cylinder (2) that is outside the cylinder must also have a certain length or more depending on the stroke length, and the portion of the piston rod that is outside the cylinder is damaged. It often caused a breakdown.

Further, the hydraulic cylinder (2) is not connected to the frame and moves along with the opening and closing action of the working arm (1), that is, when the working arm (1) is closed, that is, it is clamped. When operating, the piston rod of the hydraulic cylinder (2) is pushed out and moves to the pin (6) side together with the connected pin (4). When the working arm (1) is opened, the piston rod of the hydraulic cylinder (2) is retracted and moves to the frame (10) side together with the connected pin (4). Since the hydraulic cylinder (2) moves in this way, the pipe (hose) that supplies the hydraulic pressure to the hydraulic cylinder (2) needs to have a length that corresponds to the movement. There was a problem that the hydraulic hose could get caught during work and cause a malfunction.

Since the hydraulic cylinder (2) is not connected to the frame and the hydraulic cylinder (2) moves as the working arm (1) is opened and closed, the working arm (1) is difficult to determine. , And also on the frame (10)
It is necessary to provide an appropriate number of shock absorbing plates (18), and the work arm (1) hits the shock absorbing plates (18) during work, and even if it has a shock absorbing action, it receives a considerable shock,
In addition, the work arm (1) comes into contact with the frame (10) to generate a metallic sound.

[0006]

In order to solve the above-mentioned problems, the present invention provides a working device having a working arm in which opposite working arms are pivotally attached to a side plate of a frame so as to be openable and closable. Has two hydraulic cylinders which are connected to and operate, and the ends of the two hydraulic cylinders are rotatably pivoted to the side plates of the frame, and the other of the hydraulic cylinders is provided with a piston rod. A working device having a working arm, wherein the piston rod is connected to a base end portion of the working arm, and the two hydraulic cylinders are positioned in a V shape when the working arm is opened. .

[0007]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a view showing a state in which a work arm of a work apparatus according to an embodiment of the present invention is opened, and FIG. 2 is a side view thereof. In this embodiment, a crusher will be mainly described as a working device having a working arm. The working device having a working arm is a device that is used by being attached to an arm at the tip of a boom that is supported by a self-propelled trolley such as a hydraulic excavator so that it can be lifted and lowered. The self-propelled trolley has an excavator, a bucket, and the like attached thereto, and the excavator, the bucket, etc. are connected to the work device of the present invention in place of the excavator, the bucket, etc. . And, as shown in the drawing, this working device has a pair of working arms (1a) and (1b) facing each other, and the pair of working arms (1a) and (1b) operate so as to close, For example, crushing blades (5a), (5b)
This is for crushing objects such as concrete, reinforcing bars, and steel frames.

To install a self-propelled trolley such as a hydraulic excavator of a work device, insert a mounting pin into a pin hole (12) of a pair of brackets (11) shown in FIGS. . The pair of brackets (11) are provided on a fixed plate (10) that constitutes a frame, and the fixed plate (10) includes a rotating plate (14) and a center pin (2).
0). The rotating plate (14) constituting the frame is provided with a pair of side plates (15), and the pair of side plates (15) has a pair of working arms (1a) (1).
b) and cylinders (2a) (2b) for driving and operating the working arms (1a) (1b) are provided.

The work arms (1a) (1b) and the hydraulic cylinders (2a) (2b) will be described. Below the work arms (1a) and (1b), blades for crushing, cutting and crushing objects such as concrete and reinforced steel frames, for example, crushing blades (5a) and (5b) are provided respectively. The work arms (1a) and (1b) are arm pins attached to the side plates (15) so as to serve as opening and closing fulcrums for sandwiching and crushing an object by driving the hydraulic cylinders (2a) and (2b) connected to each. It is pivotally attached by (6). The arm pin (6) is stopped by the nut (17). That is, the work arms (1a) and (1b) are pivotally attached to the arm pins (6) so as to be openable and closable.

Clevis pins (4a) (4) connected to the piston rods (3a) (3b) of the hydraulic cylinders (2a) (2b) are provided at the base ends of the working arms (1a) (1b).
b) is provided. It is located above the arm pin (6). The ends of the hydraulic cylinders (2a) (2b) are pivotally attached to the side plate (15) by a cylinder pin (7). 2 hydraulic cylinders (2
a) and (2b) are V-shaped when the working arm (1a) and the working arm (1b) are opened by the cylinder pin (7).

As shown in FIGS. 1 and 2, when the pair of working arms (1a) (1b) are open, the clevis pins (4a) (4b) are located at the uppermost position, and then the cylinder pin. (7) and the arm pin (6) are in a positional relationship. FIG. 3 is a view showing a state in which the work arms are closed. When the work arms (1a) (1b) are closed so as to sandwich an object, the two hydraulic cylinders (2a) (2b) become horizontal. ing. That is, the hydraulic pressure is supplied to the cylinders (2a) and (2b), the piston rods (3a) and (3b) are pushed out, and the work arm (1a) is pushed.
The crushing blades (5a) and (5b) of (1b) are closed, and the object is sandwiched or cut.

When the hydraulic cylinders (2a) (2b) press the piston rods (3a) (3b) by hydraulic pressure, the working arms (1a) (1b) are moved to the arm pins (6).
At the same time, and at the same time, the two hydraulic cylinders (2a) and (2b) also swivel around the cylinder pin (7) as a fulcrum, and rotate to the vicinity of the horizontal position or to the tip thereof. The piston rods (3a) (3b) are connected to the working arms (1a) (1b) and the crespins (4a), (4).
They are connected by b), and that part also rotates. In this way, the cylinder (2a) (2b)
The pressing force by the hydraulic pressure is transmitted from the piston rods (3a) (3b) provided there to the work arms (1a) (1b), and the arm pins (6) rotate about the fulcrum, so that the crushing force,
It is a crushing force and a cutting force.

The fixed plate (10) and the rotary plate (14), which are frames, are detachably attached to the center pin (20) by a shaft.
It is possible to freely rotate 0 degrees, and it is possible to easily attach and detach. Center pin (20) inserted in the central hole of the fixed plate (10) and the rotary plate (14)
Is fixed on the fixed plate (10) by a table nut (21) so as to adjust the clearance between the fixed plate (10) and the rotary plate (14) and withstand the force applied during the work. The boom, which is supported by the self-propelled trolley so as to be able to move up and down, is provided with hydraulic piping, which supplies hydraulic pressure for operating and operating the working equipment, and is supplied through the center pin (20). is there.

The center pin (20) is provided with a rotary valve (22) capable of rotating therein. This is because the pipe (not shown) from the hydraulic outlet (23) to the hydraulic cylinders (2a) and (2b) can also rotate with the rotation of the rotary plate (14). In addition, the fixed plate (10) and the rotary plate (14) are
When it is not necessary to turn the rotary plate (14) by providing a fixing bolt mounting hole, or when a large amount of work is required,
The fixing plate (10) and the rotating plate (14) are firmly fixed with a fixing bolt to perform the work. The fixing bolt attachment holes are preferably provided around the fixing plate (10) and the rotating plate (14).

This operation will be described with reference to FIG. In FIG. 4, the solid line shows the state of FIG. 1, that is, the working arm (1
a) The two hydraulic cylinders are positioned in a V shape with (1b) open, and the two dotted lines show the state of FIG. 3, that is, with the work arms (1a) (1b) closed. The hydraulic cylinders (2a) (2b) are substantially horizontal.
With the solid work arms (1a) and (1b) open,
When hydraulic pressure is supplied to the cylinders (2a) and (2b), the piston rods (3a) and (3b) are pushed out, the connecting portions with the working arms (1a) and (1b) are pushed, and the arm pins (6) are centered. To start turning.

With the rotation, the hydraulic cylinder (2
a) and (2b) also push the work arms (1a) and (1b) while rotating with the cylinder pin (7), and rotate to the positions of the hydraulic cylinders (2a) and (2b) as shown by the dotted line, and become horizontal. The working arms (1a) and (1b) are closed when they are opened. While the working arms (1a) (1b) indicated by the solid line are opened and the working arms (1a) (1b) indicated by the dotted line are closed, the piston rods (3a) ( The position of the clevis pin (4a) (4b), which is the connecting portion with 3b), is "x +" in the horizontal direction in FIG.
It is pushed and moved by a distance of "y". Looking at this horizontal distance “x + y”, the cylinders (2a) (2
Since b) is located in the V shape, the piston rods (3a) and (3b) rotate along line 8 by simply rotating without being pushed out (centering around the cylinder pin (7)). (2) It will move "x" in the horizontal direction.

In order to change the working arms (1a) and (1b) from the open state of the solid line to the closed state of the dotted line, "x"
It is necessary to move a distance of "+ y", of which "x" is generated by rotation around the cylinder pin (7) of the cylinders (2a) and (2b), and the piston rod ( By pushing out 3a) and 3b) by hydraulic pressure, the distance of "x + y" can be moved. That is, two hydraulic cylinders (2a)
Since the end of (2b) is pivotally attached to the side plate (15) so that the work arms (1a) and (1b) are open, it is V-shaped, so that the object can be clamped. The hydraulic pressure is applied to the two hydraulic cylinders (2a) and (2b) so that the work arms (1a) and (1b) are closed, and the distance by pushing out the piston rods (3a) and (3b) is only "y" and "x + y". The distance can be moved.

Although the direction of the force of the hydraulic cylinders (2a) (2b) differs from the working direction of the work arms (1a) (1b), the work arm (1) is located above the arm pins (6).
a) It is connected to the base end of (1b), and the force of the hydraulic cylinders (2a), (2b) is transmitted to the work arms (1a), (1b) while being rotated by the pressing force. Further, the hydraulic cylinders (2a) (2b) need to be slightly larger, but the stroke of the piston may be shorter than that of the conventional ones, so the hydraulic cylinders (2a) (2b)
Even if the amount of oil sent to b) is small, the work arms (1a) (1
The same opening and closing of b) is performed. Further, by making the hydraulic cylinders (2a) and (2b) as return cylinders, hydraulic pressure is sent so that the piston rods (3a) and (3b) can be retracted, and the work arms (1a) and (1b).
It can also be driven to open from the closed state

[0019]

As described above, according to the present invention, the stroke of the piston rod is shorter than that in the case where the conventional cylinder is arranged horizontally, and the portion exposed to the outside of the piston rod is short, so that the piston rod is damaged. Rarely. Further, since the stroke of the piston can be short, the amount of oil supplied to the hydraulic cylinder can be small. Also,
Since the end of the cylinder is connected to the center of rotation by the cylinder pin, there is no problem such as the hydraulic hose getting caught during work. In addition, since it is connected by two cylinders or cylinder pins and does not wobble during work, it is less likely to be impacted, and the work arm does not come into contact with the frame to generate metallic noise. It is effective.

[Brief description of drawings]

FIG. 1 is a diagram showing a state in which a work arm according to an embodiment of the present invention is opened.

FIG. 2 is a side view of FIG. 1 showing an embodiment of the present invention.

FIG. 3 is a diagram showing a state in which a work arm according to the embodiment of the present invention is closed.

FIG. 4 is a diagram for explaining the operation of the embodiment of the present invention.

FIG. 5 is a view showing a working device having a conventional working arm.

[Explanation of symbols]

 1.1a. 1b. Working arm 2.2a. 2b. Cylinder 3a. 3b. Piston rod 4.4a. 4b. Pin 5.5a. 5b. Crushing blade 6. Arm pin 7. Cylinder pin 10. Fixed plate 11. Bracket 12. Shovel mounting hole 14. Rotating plate 15. Side plate 16. Nut 17. Nut 18. Buffer plate 20. Center pin 21. Double nut lube 22. Rotary valve 23. Hydraulic outlet

Claims (1)

[Claims] 1. A working device having a working arm in which opposite working arms are pivotally attached to a side plate of a frame so as to be openable and closable, and has two hydraulic cylinders which are connected to the working arm to operate. The two hydraulic cylinders are pivotally attached at their ends to the side plates of the frame, and the other of the hydraulic cylinders is provided with a piston rod, said piston rod being connected to the base end of the working arm, and The working device having a working arm, wherein the two hydraulic cylinders are positioned in a V shape when the working arm is opened.