JPS61294023A - Cutter for steel skeleton material - Google Patents

Abstract

PURPOSE:To exactly cut off an object to be cut by providing an oil-pressure mechanism having a constitution in which a shearing blade is provided from the pivotal fitting portion to the tip end of paired arms, notched portions are formed in each shearing blade, and the front end of the arms is opened or closed at the pivotal fitting portion. CONSTITUTION:A pair of arms 1 are set in a mutually facing manner, and a support shaft 1a is pivotally provided between side plates 3 through a shaft 2. The oil-pressure cylinder 13 of an arm-opening and closing drive mechanism is set between the side plates 3, the rear end of one arm 1 is pivotally attached through a pin 16 to the cylinder 13, and the rear end of the other arm 1 is pivotally attached through a pin 17 to the tip of a piston rod 13a. Shearing blades 20 are fixed by bolts 21 to the counter portions from the pivotal fitting portion of the shaft 2 to the tip end of the arms 1. One or more notched portions 22 are provided in part of the shearing blades 20.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cutting device for cutting steel frames and shaped steel materials in concrete structures, and more particularly to a cutting device that is mounted on a hydraulic excavator.

Conventional technology Conventionally, this type of cutting device uses scissor-type shearing blades to shear steel frames and pipes, but because the two shearing blades shear like a pair of scissors, the object to be cut is There was a drawback that it was not easy to escape to the tip side and cut. For this purpose, a pair of crushing blades that pinch and crush the object to be cut are mounted facing each other on the distal ends of a pair of arms that are driven by hydraulic cylinders and are arranged opposite each other, and are A pair of shearing blades that shear the crushed portion of the object to be cut by the closing action of the arms are mounted facing each other on the curtain sides of both arms, and the object to be cut is crushed once and then cut. A device was developed (
(See Japanese Patent Application No. 163082/1982).

Problem to be Solved by the Invention - 2 = The developed cutting device has crushing blades for crushing the steel frame, which is the object to be cut, at the tips of the pair of arms. When making a first cut, the object to be cut must be moved to the position of the cutting blade. That is, the object to be cut must be moved to the ends of the pair of arms. If the object to be cut is exposed as part of a structure, such as a column or beam, the object can be held and cut at the back of the arm of the cutting device, that is, at the position of the cutting blade. destroy,
If there is an object to be cut, such as a steel frame that has overturned on the ground 1-, or an obstacle such as a wall in front of the object to be cut, the tip of the arm may come into contact with the ground or the obstacle, causing the arm to fall. The object to be cut could not be moved to the cutting blade position.

For this reason, conventionally the object to be cut is suspended inside when cutting.
The work was difficult and inefficient. The present invention solves this problem by making it possible to cut objects such as steel frames even if the object is overturned on the ground and there is an obstacle in front of it and the arm cannot be moved all the way to the front. This is what I did.

Means for Solving the Problems The present invention solves the above problem by providing stages of shearing blades from the pivot point to the tip of each arm, and providing each shearing blade with one or more notches. Settled.

Since the shearing blade is installed all the way to the working tip, there is no need to push the arm deep into the object to be cut, and it can be used to cut steel frames that are lying on the ground or have obstacles in the back. It can be cut with the shear blade at the tip of the arm. At that time, the end of the object to be cut, such as a steel frame, engages with the notch provided in the shearing blade, and the object to be cut escapes from the shearing blade, making it difficult to cut the object. Never.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 1, reference numeral 1.1 denotes a pair of arms arranged opposite to each other, and support shafts ia and la provided at the intermediate part of the arms 1.1 are connected via a shaft 2.2. The side plates 3.3 are rotatably connected between the side plates 3, 3, and the side plates 3.3 are connected at a constant interval, and their ends are fixed to the rotating plate 4. is attached to a support plate 5 so as to be rotatable around an axis, and a bracket member 8 having attachment holes 6 and 7 is fixed to the support plate 5. The mounting hole 6 of the bracket member 8 is provided, for example, with a bin 1 at the tip of an arm 9 of a boom of a working machine (not shown) such as a movable power scissor bell.
0, and the mounting hole 7 is connected to the arm 9 of the boom.
Piston rod 11 of hydraulic cylinder 11 installed above
A is pivotally attached to the tip of the piston rod 11a via a pin 12, and by changing the protrusion length due to expansion and contraction of the piston rod 11a,
The working angle of the side plate 3.3 or the arm 1.1 is set.

A hydraulic cylinder 13 serves as an opening/closing drive mechanism for opening and closing the arm 1.1, and is disposed between the side plates 3.3. 16, and the rear end of the other arm connects to the piston rod 13 of the hydraulic cylinder 13.
The hydraulic cylinder 13 is selectively supplied with pressure oil from a hydraulic supply source of a working machine (not shown) through a hydraulic hose, and is moved forward and backward. Arm 1,1
performs opening and closing operations. The hydraulic cylinder 13 is provided between the side plates 3.3 so as to be slidable in the vertical direction. From the pivot point on the axis 2,2 on the arm 1.1 to the tip of the arm 1.1, on its opposite side a shearing blade 20.2 is mounted.
0 is fixed at poles 1 to 21, and the shearing blade 20.2
A substantially arc-shaped cutout portion 22.22 is provided in a part of 0. In this embodiment, the shearing blades 20', 20 are each formed by two shearing blades, and a notch 22.22 is formed between the two shearing blades. Further, at the most extreme ends of the arms 1, 1, one arm 1 is provided with a convex portion 23, and the other arm 1 is provided with four portions, and the convex portion 23 and the four portions 24 are shown by two-dot broken lines when the arms are closed. The convex portion 23 and concave portion 24 protect the ends of the shearing blades 20.20, and when the arm 1.1 is closed, the shearing blades 20.20 intersect. Do- 〇
- ensuring that When cutting steel frames such as 1-1 type steel and [- type steel with such a cutting device, as shown in FIG.
When the object to be cut A8, for example, the end of a 1"-shaped steel piece, is held in the cutout part 22.
2 engages with the end of the object to be cut A, the object to be cut will not slip and escape, and the object to be cut A will be cut.

Further, since the shearing blades 20.20 are provided at the tip J: of the arm 1.1, there is no need to move the arms 1.1 to the opposite end of the object to be cut. Since it can be cut with the tip of arm 1.1, even if the object to be cut A is lying on the ground, there is an obstacle in the way of the object to be cut, and the object A can be cut without pushing the arm 1.1 all the way in. reactor. In the above embodiment, each shearing blade 20.20 is provided with one notch 22.22, but each shearing blade 20.20 may be provided with a plurality of notches 22.22. good.

Also, as shown in FIG. 3, a shearing blade 20'.

20' in a sawtooth shape (other configurations are shown in Figure 1-7).
(same as in the embodiments), the objects to be cut may be separated one by one on the shearing blades 20' and 20'.

9) + F. of the Invention As described above, the cutting device of the present invention is provided with a shearing blade up to the tip of the arm, and when an object to be cut is held between the shearing blades, the object to be cut slips and escapes. Since the shear blade has a notch to prevent the cutting from occurring, the object to be cut can be cut at the tip of the arm, making it possible to cut not only the steel frame of H-beams and H-beams lying on the ground, but also reinforcing bars. I can do it.

Furthermore, even if there is an obstacle to the east of the object to be cut, the arm can be easily cut because the arm does not have to be pushed all the way into the object. Furthermore, compared to conventional cutting devices that have crushing blades, the cutting device can cut at the tip of the arm, so the opening degree of the arm can be reduced and the object to be cut can be held and cut, making it easy to cut even in places where there is not much space. .

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of one embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of the same embodiment, and FIG. 3 is an explanatory diagram of main parts of another embodiment of the present invention. 1.1... Arm, 1a, la... Support shaft, 2, 2
...Shaft, 3.3...Side plate, 1...Rotating plate, '5.
・・Support plate, 6.7・Mounting hole, 8・Bracket member, 9・Sparrow, 10.12・Pin, 11.13
... Hydraulic cylinder, 11a, 13a... Screw 1 to rod, 14.15... Protrusion, 16.17... Bottle, 20.20'... Shearing blade, 21... Pol 1 ~． 2
2... Notch part, 23... Convex part, 24... Four parts.

Claims (3)

[Claims] (1) A pair of arms whose intermediate portions are pivotally connected to the side plates, a hydraulic mechanism provided at the rear end of the arms that opens and closes the front end of the arm around the pivoting part, and the front end of the arm. The opposite part of the part extends from the pivot part to the tip part,
A steel frame cutting device characterized in that shearing blades are provided, and each of the shearing blades is provided with one or more notches. (2) The steel frame cutting device according to claim 1, wherein the shearing blade has a sawtooth shape due to a notch provided in the shearing blade. (3) The steel frame cutting device according to claim 1, wherein the notch provided in the shearing blade is an arcuate notch.