JP2008248640A - Cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out accurate cutting operation easily and to facilitate machining of a workpiece with thickness preventing the whole of the workpiece from being inserted between jaws. <P>SOLUTION: The cutting device is constructed of a pair of jaws 2 and 3 connected by a shaft 4 freely rotationally relatively and opened/closed by a drive means, cutting blades 20 and 30 respectively provided with cutting edges in the direction crossing the shaft at right angles and arranged on the facing sides of these jaws, and splitting blades 21 and 31 provided with cutting edges in the parallel direction to the shaft and respectively arranged at the tip edges of the respective jaws. The blade 20 of the jaw 2 has a recessed arc shape, while the blade 30 arranged on the recessed arcuate inner circumference side of the jaw 3 has a projected arcuate shape. The tip part having the splitting blade 31 of the jaw 3 extends to the jaw 2 side beyond the part for mounting the blade 30, and the tip part of the jaw 2 enters the inside of the tip part of the jaw 3 when the both of the jaws 2 and 3 are closed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cutting device that is attached to the tip of a boom of a power shovel civil engineering construction machine and is used for cutting wood or the like.

  As a cutting device that is attached to the tip of a boom and is used for cutting wood, there is one shown in FIG. A base 1 connected and fixed to the tip of the boom, a fixed jaw 2 integrally formed or fixed to the base 1, and a movable jaw 3 rotatably connected to the base 1 and the fixed jaw 2 by a shaft 4 And a hydraulic cylinder 5 that has one end connected to the base 1 and the other end connected to the movable jaw 3 and rotates the movable jaw 3 as it expands and contracts. Cutting blades 20 and 30 each having a cutting edge perpendicular to the axis 4 are attached to the surface to be moved, and when the movable jaw 3 is moved toward the fixed jaw 2 by the hydraulic cylinder 5, both jaws 2 and 3 The object to be cut sandwiched between the blades 20 and 30 is cut. This scissor-shaped cutting device is suitable for cutting a long log in a direction perpendicular to the longitudinal direction, but cannot cut a log having a large diameter.

  On the other hand, as shown in FIG. 9, there are also provided those provided with split blades 21, 31 each having a cutting edge parallel to the shaft 4 at the leading edge of the fixed jaw 2 and the leading edge of the movable jaw 3. In this case, as shown in FIG. 10, the cutting blades 21, 31 are bited into the outer peripheral surface of the workpiece (log) 9, or the split blades 21, 31 are inserted into both end surfaces of the short workpiece (root stock, etc.). If it bites in, the to-be-cut | disconnected object 9 can be torn in radial direction.

And what was equipped with said 2 types of blades 20, 21, 30, and 31 is proposed by patent document 1, but what was shown here is what the blades 20 and 30 have a linear cutting edge. Since the central portions are arranged side by side so as to be concave, there is a problem that the cutting sharpness by the blades 20 and 30 is not good, and the split blades 21 and 31 are applied to the outer peripheral surface of the workpiece. When the workpiece is torn, there is a problem that the blades 20 and 30 and the jaws hit the workpiece to increase the load.
JP2003-266369

  The present invention has been invented in view of the above-described conventional problems, and can cut a long object to be cut accurately and easily, and the whole is put between jaws. It is an object of the present invention to provide a cutting apparatus that can easily process a workpiece having a thickness that cannot be easily removed.

  In order to solve the above problems, a cutting device according to the present invention is a cutting device that is attached to a boom tip of a power shovel type civil engineering construction machine and used for cutting wood or the like, and is relatively connected by a shaft. A pair of jaws that are rotatable and opened and closed by a driving means that drives at least one of the jaws, and a cutting edge that has a cutting edge in a direction perpendicular to the axis and is arranged on the opposing surface side of these jaws. Each of the jaws has a cutting edge in a direction parallel to the axis and provided at the leading edge of each jaw. The blade provided on one of the jaws has a concave arc shape, and the other jaw The above-mentioned blade provided on the inner peripheral side forming a concave arc shape has a convex arc shape, and the tip portion of the other jaw provided with the above-mentioned tearing blade is provided with the above convex arc-shaped blade. Extend to one jaw side than the part, It is characterized in that the tip of one jaw has become that enters the inside of the front end portion of the other jaw when closed ® chromatography.

  The other jaw is rotatable about an axis, and the inner peripheral surface of the tip is an arc surface having a radius centered on the axis. It is preferable that the cut object is not clogged by being pushed between the jaws.

  Further, if the convex arc-shaped blade of the other jaw is detachable, it is possible to prevent the blade from getting in the way or increasing the resistance when tearing with the tearing blade, by removing the blade.

  Since the present invention has a convex arcuate blade, the workpiece can be cut smoothly, and there is no blade at the tip of the jaw having the convex arcuate blade. Since it extends to one of the jaws, the object to be cut is not pushed out by the blade and slips out between the jaws, and the object to be cut can be picked up by the extended tip part. Cutting can be performed accurately and easily. Moreover, even though the cutting blade has a convex arc shape, there is a tearing blade at the extended tip, so that the convex arc-shaped blade can get in the way or tear when the material to be cut is torn by the tearing blade. There is little risk of getting in the way, and it is possible to perform a series of operations such as tearing a thin and long object to be cut and then cutting it short.

  Hereinafter, the present invention will be described based on an embodiment shown in the accompanying drawings. In FIGS. 1 to 3, the base 1, a fixed jaw 2, and a movable jaw 3 that is rotatable by a shaft 4 and a hydraulic cylinder 5 are configured. In that respect, the blades 20 and 30 have the same configuration as that of the conventional example, and the blades 20 and 30 are provided with cutting edges perpendicular to the shaft 4 on the inner peripheral surface side of the fixed jaw 2 and the inner peripheral surface side of the movable jaw 3. It is the same as that shown in the above-mentioned patent document 1 in that the cutting edges 21 and 31 provided with the cutting edges parallel to the shaft 4 are formed on the leading edge of the fixed jaw 2 and the leading edge of the movable jaw 3. However, the blade 20 provided on the fixed jaw 2 has a concave arc shape, and the blade 30 provided on the movable jaw 2 has a convex arc shape. Further, only one blade 20 and 30 is provided, and the blades 30 are detachably attached to the movable jaw 3 while being arranged at the center in the width direction of the jaws 2 and 3.

  The movable jaw 3 has a side surface that is greatly curved in a J-shape, and the radius of curvature on the inner surface side of the tip portion where the tear blade 31 is provided draws an arc centered on the shaft 4. In addition, when the movable jaw 3 is closed with respect to the fixed jaw 2, the distal end portion of the movable jaw 3 covers the outer peripheral side of the distal end portion of the fixed jaw 2. That is, the tear blade 31 is arranged outside the tear blade 21.

  Further, the convex arcuate blade 30 is not provided over the entire length of the inner periphery of the movable jaw 3, but the fixed jaw 2 enters the movable jaw 3 when the movable jaw 3 is closed with respect to the fixed jaw 2. When the movable jaw 3 is closed with respect to the fixed jaw 2, the cutting edges of the concave arcuate blade 20 and the convex arcuate blade 30 overlap almost the entire length.

  In a cutting and crushing device provided with such blades 20 and 30 and tearing blades 21 and 31, a workpiece (log) 9 having a diameter that can be inserted between the fixed jaw 2 and the movable jaw 3 is described. 4, the workpiece 9 can be cut with blades 20 and 30 in a direction orthogonal to the longitudinal direction.

  At this time, since the blade 30 has a convex arc shape and the workpiece 9 is slidable with respect to the blade 30, the blade 30 can be cut with good sharpness. Although the cut object 9 is slippery, the tip of the movable jaw 3 extends beyond the region where the blade 30 is provided, and the tip of the fixed jaw 2 and the movable jaw 3 is cut. In order to prevent the workpiece 9 from escaping from the blades 20 and 30 by pressing the workpiece 9 toward the blades 20 and 30, the workpiece 9 can be reliably cut.

  In addition, when the cutting object 9 is cut, the portion of the movable jaw 3 where the blade 30 does not have a blade 30 functions as a material that feeds the cutting object 9 to the blades 20 and 30 side while cutting the cutting object 9. In addition, it is easy to catch the workpiece 9 and feed it to the blades 20 and 30 side, and the tearing blades 21 and 31 do not get in the way during this cutting, so that the workpiece can be covered accurately and easily. The cut product 9 can be cut.

  And when the diameter of the to-be-cut object 9 is large and the to-be-cut object 9 cannot be put between the blades 20 and 30, the tearing blade 21 and the movable jaw 3 at the tip of the fixed jaw 2 are formed on the outer surface of the to-be-cut object 9. When the movable jaw 3 is closed with respect to the fixed jaw 2 by applying the tip of the tearing blade 31, as shown in FIG. Can be torn. In particular, as shown in the figure, it is possible to easily split the workpiece 9 in the radial direction by biting the cutting blades 21 and 31 into the outer peripheral surface of the workpiece 9 that is a log. The workpiece 9 whose diameter is reduced by cracking in this way can be shortened by cutting with the blades 20 and 30 described above.

  The blades 20 and 30 do not get in the way when the tear blades 21 and 31 start to bite into the workpiece 9. Further, when the tearing blades 21 and 31 are greatly cut into the workpiece 9, the blades 20 and 30 start cutting in the direction perpendicular to the longitudinal direction of the workpiece 9, but the blades 20 and 30 are cut. The amount of penetration is not so large, and therefore the blades 20 and 30 do not increase the cutting load of the workpiece 9 by the tear blades 21 and 31.

  Of course, if the diameter of the workpiece 9 is further increased, the convex arcuate blade 30 will come into contact with the workpiece 9, but in such a case, it is detachable from the movable jaw 3 as shown in FIG. It is only necessary to remove the blade 30 and perform the tearing work with the tearing blades 21 and 31. When the cutting edges of the tearing blades 21, 31 are digged into the workpiece 9, the blade 30 does not push the workpiece 9 out between the tearing blades 21, 31, and the blade 30 contacts the workpiece 9. It does not bite and increase the cutting load.

  In addition, in the case of the one provided with the splitting blades 21 and 31 shown in FIG. 9, the splitting blade 31 of the movable jaw 3 enters the inside of the splitting blade 21 of the fixed jaw 2. As shown in FIG. 10, when the tear blades 21 and 31 are torn, the trajectory moves in the direction in which the tear blade 31 presses the workpiece 9 against the fixed jaw 2 side. In some cases, the object 9 is sandwiched between the movable jaw 3 and the object 9 cannot be torn. However, here, as described above, the inside of the distal end portion where the tearing blade 31 of the movable jaw 3 is provided. Since the circumferential surface is a surface that draws an arc centered on the axis 4 and at the same time, the outer surface of the stationary jaw 2 is outside the tearing blade 21, the tearing blade 31 is split when it bites into the workpiece 9. The cut object 9 is moved by the movable jaw 3 Not be pushed to the constant jaws 2 side, which is pushed out of the movable jaw 3 is one object to be cut 9 for this is not entirely jammed between jaws 2,3.

  In the above embodiment, the fixed jaw 2 and the movable jaw 3 are shown. However, the pair of jaws 2 and 3 may be movable. Moreover, although what has shown the hydraulic cylinder 5 as a drive means here was shown, it does not restrict to this.

  Further, the convex arc-shaped blade 30 is formed so as to draw a smooth arc, but is not limited thereto, and small saw blades are arranged as long as it forms a convex arc shape as a whole. Also good.

It is a perspective view of an example of an embodiment of the invention. It is a side view same as the above. It is a side view of the closed state same as the above. It is a side view at the time of the cutting | disconnection by a blade same as the above. It is a side view at the time of tearing by the tearing blade same as the above. It is another side view at the time of tearing by the tearing blade same as the above. It is a side view which shows operation | movement of the tearing blade by the side of a movable jaw same as the above. It is a side view of a prior art example. Another example is shown, and (a) and (b) are side views. It is a side view which shows operation | movement same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Fixed jaw 3 Movable jaw 4 Axis 5 Hydraulic cylinder 20 Blade 21 Split blade 30 Blade 31 Split blade

Claims (3)

  A cutting device mounted on the tip of a boom of a power shovel-type civil construction machine and used for cutting wood or the like, which is relatively rotatable by a shaft connection and drives at least one jaw A pair of jaws that are opened and closed by the blade, a cutting blade that has a cutting edge in a direction orthogonal to the axis and is disposed on the opposite surface side of the jaw, and a cutting edge in a direction parallel to the axis Each of the jaws includes a tear blade provided at the tip edge of each jaw, and the blade provided on one of the jaws has a concave arc shape, and the blade provided on the inner peripheral side forming the concave arc shape of the other jaw. Has a convex arc shape, and the tip portion of the other jaw where the tearing blade is provided extends to one jaw side from the portion where the convex arc-shaped blade is disposed, and closes both jaws. When the tip of one jaw Cutting device characterized in that it is intended to enter the inside of the front end portion of the over.   2. The cutting apparatus according to claim 1, wherein the other jaw is rotatable about an axis, and an inner peripheral surface of a tip portion thereof is an arc surface having a radius centered on the axis.   3. The cutting apparatus according to claim 1, wherein the convex arcuate blade of the other jaw is detachable.

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