JPH0362866B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a cutting device suitable for cutting steel frames and shaped steel materials in concrete structures, particularly for cutting pipes. Many pipelines are installed in chemical plants, steel factories, nuclear plants, large tankers, etc., and when these pipelines are partially replaced due to aging, it may affect other pipelines. It is a very difficult task to remove only the pipes that need to be replaced without giving any damage to the pipes, especially in chemical plants where it is impossible to use a melting device. . The present invention relates to a cutting device that is attached to a hydraulic excavator and is suitable for selectively cutting and removing pipes that need to be replaced even in places where a large number of pipes run.

Conventional technology Conventionally, there are cutting devices of this type that shear steel frames and pipes with scissor-type shear blades.
Since shearing is performed using two shearing blades like scissors, the object to be cut escapes toward the tip of the shearing blades, making it difficult to cut the object. 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 the crushing blades are mounted facing each other to pinch and crush the object to be cut when the arms close. A pair of shearing blades that shear the crushed portion of the object to be cut by the closing action of the arms are attached to the base ends of both arms so as to face each other, and the object to be cut is crushed once and then cut. A device was developed (see Japanese Patent Publication No. 62-17059).

Problems to be Solved by the Invention In the developed cutting device, a cylinder of a hydraulic cylinder is fixed to one arm of the pair of arms, and a piston rod is fixed to the other arm. The arm is designed to open and close. Therefore, when both arms are placed horizontally, the arms can maintain a symmetrical position with respect to the center line, or when placed vertically, one arm is at the top and the other arm is at the bottom. When the hydraulic cylinder is opened, both arms rotate due to the weight of the hydraulic cylinder, and the center line of the opening of both arms changes. Therefore, when an object to be cut is to be clamped, the direction of rotation of the arm varies depending on the clamping direction of the cutting device, which impairs the operability of the cutting device. In particular, in installations where many pipelines are installed side by side, when attempting to select and cut one of the pipelines,
When the arm rotates, there is a risk of affecting other pipes, and the rotation of the arm restricts the operating direction, that is, the clamping direction, making operability very poor.

The present invention improves the drawbacks of the prior art as described above.

Means for Solving the Problems The present invention includes a pair of arms pivotally connected to a side plate, one end of a hydraulic cylinder is pivotally connected to the rear end of one arm, and the hydraulic cylinder is connected to the rear end of the other arm. In the cutting device in which a piston rod is pivotally connected, the pair of arms are opened and closed by the operation of the hydraulic cylinder, the object to be cut is crushed by a crushing blade and a shearing blade provided at the tip of the arm, and then cut. The above problem can be solved by pivotally connecting a link between the side plate and the hydraulic cylinder that is parallel to a line connecting the pivot points of the side plate of the one arm and the hydraulic cylinder and has a length equal to the distance between the pivot points. solved.

Function: The link, the side plate, and the one arm pivotally connected to the hydraulic cylinder form a kind of parallel link mechanism, so when the hydraulic cylinder operates and the arm performs opening/closing motion, the link and the one arm of the hydraulic cylinder The line connecting the pivot points of the arms always moves in parallel, that is, it always moves parallel to the line connecting the pivot points on the link and the side plate of one arm, and as a result the hydraulic cylinder also moves in parallel. Therefore, the arms always open and close symmetrically about the center line.

Embodiment FIG. 1 is a front view of one embodiment of the present invention, and FIG. 2 is a side view of the same. 1 and 1' are a pair of arms arranged to face each other. These arms 1, 1'
The intermediate portions 1a, 1a' are pivotally connected between the side plates 3, 3' via pins 2, 2'. These side plates 3 and 3' are fixed to an end plate 4, and this end plate 4 is attached to an end plate 5 so as to be rotatable around an axis. , 3' are adapted to be rotated. Also,
A bracket member 6 having mounting holes 7 and 8 is fixed to the end plate 5. The mounting holes 7 and 8 of the bracket member 6 are pivotally connected via pins to an arm of a boom of a working machine such as a power shovel (not shown) and a piston rod of a hydraulic cylinder installed on the arm, respectively. The working angle of the side plates 3, 3', that is, the arms 1, 1', is set by the expansion and contraction of the arms 1, 1'. A hydraulic cylinder 9 opens and closes the arms 1 and 1', and one end of the hydraulic cylinder 9 is rotatably connected to the rear end of the one arm 1' via a pin 11'. The piston rod 10 of the other arm 1
It is rotatably attached to the rear end of the body via a pin 11. Further, links 12 and 12' are rotatably connected to one end of the hydraulic cylinder 9 via a pin 14, and the other end of the link 12 is connected to the side plates 3 and 3'.
It is rotatably pivoted to a pin 13 fixed to. The length of the link 12, that is, the distance between the pins 13 and 14 is equal to the distance between the pin 2' and the pin 11', which pivotally connect the arm 1', and the link 12 connects the pins 2 and 11'. It is configured to be parallel to the connecting line. The tips of the arms 1, 1' are formed thin, and the arms 1, 1' are formed inside.
A pair of crushing blades 15 and 15' are provided facing each other to pinch and crush the object A to be cut by the closing operation.
Further, a pair of shearing blades 16, 16' are mounted facing each other following the crushing blades 15, 15', and a first
As shown in the figure, the pair of shearing blades 16, 16' intersect when the arms 1, 1' are closed. In addition, 17, 17' are the side plates 3,
A stopper provided at the arm 1,
When 1' is opened, it comes into contact with the arms 1, 1' and restricts the arms 1, 1'. Further, the tip ends of the arms are formed so that they come into contact with each other when the arms 1 and 1' are closed, and the crushing blades 15 and 15' do not come into contact with each other. It is formed so that it does not slip away from between 1'.

Next, the operation of this embodiment will be explained. Pressure oil is supplied from a hydraulic supply source (not shown) to the hydraulic cylinder 9 via a hydraulic hose, etc., and the arms 1 and 1' are in an open state as shown by the broken line in Fig. 1, and in this state, the pipes, etc. The object to be cut A is crushed by the blade 15,1
5' and then extend the piston rod 10 of the hydraulic cylinder 9 to close the arms 1, 1', the object A to be cut is crushed by the crushing blades 15, 15', and then the piston rod 10 is shortened to open the arms 1, 1', and the crushed object A to be cut is positioned between the shear blades 16, 16'.
When the arms 1 and 1' are closed, the object A to be cut is already crushed, so the object A to be cut is cut by the shear blade 1.
6, 16' are cut without escaping to the tip side.

Although the above-described operation is performed, the present invention is characterized in that links 12 and 12' are provided. Conventional cutting devices do not have the link 12 and therefore:
The object to be cut A is cut by the arms 1 and 1' of the cutting device.
Depending on the direction of clamping, the weight of the hydraulic cylinder 9 was applied to one arm, and the arms 1, 1' as a whole were rotated until stopped by the stoppers 17, 17'. This has made the cutting device less operable. However, in the present invention, the link 12,
12', the arms 1, 1' can approach the object A to be cut from any direction without rotating, no matter what direction the arms 1, 1' are tilted. It's summery. That is, during the crushing and cutting operations, the arms 1,
1' will rotate around axes 2 and 2',
As the arm 1' rotates, the link 12 also rotates around the pin 13. Since the link 12 has the same length as the distance between the pin 2' and the pin 11' and is parallel to the pin 11', the link 12 rotates around the pin 13. The line connecting pin 14 is parallel to the line connecting pin 2' and pin 13, and the line connecting pin 2' and pin 13 is at a constant angle with respect to the center line-axis, so it connects pins 11 and 14. The line always intersects the longitudinal axis at the same angle and moves in parallel. The translation of two points (pins 11' and 14) on the hydraulic cylinder 9 means that the hydraulic cylinder 9 itself is translated at a certain angle to the center line-axis, and the hydraulic cylinder 9 is moved parallel to the longitudinal axis. - Since the link 12 is fixed so as to be arranged perpendicular to the axis, the hydraulic cylinder 9 intersects the center line in the direction perpendicular to the axis,
And it will move in parallel. That is, the hydraulic cylinder 9 is held perpendicular to the center line -' axis as shown in FIG. 1 and moves up and down. As a result, the arms 1 and 1' are always opened and closed symmetrically with respect to the center line -' without being biased in one direction.

Note that the shearing blades 16, 16' are fixed to the arms 1, 1' with bolts or the like so that they can be replaced, and the crushing blades 15, 1
5' was provided on the arm 1, 1' itself, but
The crushing blades 15, 15' may also be configured to be replaceable like the shearing blades 16, 16'.

Effects of the Invention As described above, in the cutting device of the present invention, no matter what direction the arm is tilted, the arm itself does not rotate due to the gravity of the hydraulic cylinder, etc., and the center line of the arm is Since it can always be held in the direction set by the operator, the object to be cut can be easily approached from any direction, greatly improving operability. Furthermore, since the tip of the arm of the cutting device is formed thin, when selecting and cutting one pipe in a place where many pipelines are lined up, the arm can be inserted in the optimal direction to fit into the narrow space between the pipelines. It can be inserted, crushed and cut. This cutting device first crushes and then cuts, so
Unlike conventional cutting devices, the object to be cut does not slip between the shear blades and cause the cutting device to be moved, so the cutting device does not hit other pipes and damage pipes that should not be cut. There is no problem, and the operability is very good, and the object to be cut can be cut efficiently.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a side view of the same. 1, 1'... Arm, 2, 2'... Pin, 3,
3'... Side plate, 9... Hydraulic cylinder, 10... Piston rod, 12, 12'... Link, 15, 1
5'... Crushing blade, 16, 16'... Shearing blade.

Claims (1)

[Scope of Claims] 1. One end of a hydraulic cylinder is pivotally attached to the rear end of one of a pair of arms pivotally attached to a side plate, and a piston rod of the hydraulic cylinder is pivotally attached to the rear end of the other arm. In a cutting device that opens and closes the pair of arms by operating the hydraulic cylinder, crushes the object to be cut using a crushing blade and a shearing blade provided at the tip of the arm, and then cuts the object. A link parallel to a line connecting pivot points of the side plate and the hydraulic cylinder and having a length equal to the distance between the pivot points is pivotally connected to the side plate and the hydraulic cylinder, and the hydraulic cylinder is moved by opening and closing of the arm. A cutting device characterized in that it is configured to move in parallel. 2. The cutting device according to claim 1, wherein the distal end portion of the arm is formed thin. 3. When the arms are closed, the leading ends of the arms are in contact with each other, the shearing blades are crossed, and the crushing blades are formed so as not to be in contact with each other, so that during the crushing action, the object to be crushed and cut slips and escapes from between the arms. 3. A cutting device according to claim 1, wherein the cutting device is configured such that the cutting device does not have a cutting surface.