JP2774469B2 - Rectangular cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rectangular cutting machine which dismantles a structure such as a building, a vehicle, a ship or the like while punching the same into rectangular pieces.

[0002]

2. Description of the Related Art As a dismantling device for a structure, a shearing machine for cutting a structure like scissors by engaging a pair of straight blades attached to an upper jaw member and a lower jaw member, respectively, is generally used. However, this type of shearing machine has a drawback that, when cutting a structure longer than the blade length, the blade and the structure interfere with each other, making it difficult to perform the operation. Therefore, a U-shaped blade composed of a pair of left and right parallel side blades and a tip blade that joins the tips of the side blades is attached to both jaw members, and the blades are engaged with each other to form a rectangular structure. A rectangular cutter for punching in a piece shape has been proposed. This cutter is
The structure is punched into small rectangular pieces so that the blade is easy to advance, and because the rectangular pieces produced by dismantling are almost fixed size and constant weight, they are easy to handle and suitable for recycling. It is.

FIG. 8 shows an example of the arrangement of blades of a conventional rectangular cutter. As shown in the figure, the lower surface of the U-shape is composed of a pair of lower side blades (31b) arranged in parallel and a lower end blade (31a) arranged perpendicular to the front end of the lower jaw (30). A cutting blade (31) is mounted. Similarly, a U-shaped upper cutting blade (34) composed of an upper tip blade (34a) and a pair of upper side blades (34b) is also attached to the meshing surface of the upper jaw (33). The upper tip blade (34a) and the side blade (34b) correspond to the upper jaw (33).
When they are closed, they are arranged at positions where they fit inside the lower tip blade (31a) and the lower side blade (31b) with a slight gap therebetween. The upper tip blade (34a) is formed in a shape in which the blade surface is raised in a V-shape in order to prevent the entire lower surface (blade surface) of the upper blade (34a) from simultaneously contacting the object to be cut during cutting.

[0004]

In such a structure, when the upper jaw (33) is closed, first, as shown in FIG.
The object to be cut is cut from the cutting edge toward the cutting edge by the upper and lower side blades (34b) (31b) (indicated by arrows). Next, when this cutting progresses to some extent, the pointed end (35) formed in the center of the upper tip blade (34a) breaks through the object to be cut, and the object is cut from this portion by the upper and lower tip blades (34a).
a) It is cut toward both sides by (31a) (indicated by arrow '). At the same time, the cutting by the side blades (34b) and (31b) proceeds (indicated by arrows), and two cutting lines ′ are formed at the corners of the side blades (34b) and (31b) and the tip blades (34a and 31a) ( At the intersection at A), the object to be cut is cut into a rectangular piece.

At the corner (A), since the cutting lines ′ from two perpendicular directions intersect, the cut piece is cut off from the object to be cut, not by shearing, but more specifically by tearing. Generally, more power is required to break the material than to shear. Therefore, conventionally, the upper jaw (3) when the cutting operation is completed, that is, when the cutting line ′ reaches the corner (A).
In some cases, the closing power of 3) was insufficient, and the cut piece could not be completely separated depending on the material and size of the object to be cut. On the other hand, it is inefficient to equip a large-capacity power source for cutting only the corner (A).

[0006] At the dismantling site, there is a strong demand not only for reliable and stable cutting but also for quick cutting. In view of the above, a first object of the present invention is to ensure and stabilize a punching operation while reducing required power.

A second object is to speed up the punching operation.

[0008]

According to the present invention, a pair of jaw members which open and close about a pivot are provided, and each of the abutting surfaces of the two jaw members has a U-shape comprising a tip blade and a pair of side blades. A cutting blade is provided, and the cutting blade of one jaw member is engaged with the cutting blade of the other jaw member to cut the object to be cut into a rectangular piece. Is depressed into a substantially V-shape.

In this configuration, when the jaw members are closed, first, as shown in FIG.
b) (20b) starts to mesh with each other, and the object to be cut is cut from the cutting edge toward the cutting edge (cutting line). During cutting by the side blades (20b) (14b), the tip blades (20a) (14a) do not start cutting unlike the conventional apparatus. Next, when the cutting by the side blades (20b) and (14b) is completed and the cutting line advances to the corner (A), the tip blade (20a)
(14a) The members begin to mesh with each other, and the object to be cut is cut from the corner (A) toward the center (indicated by a cutting line).

As described above, according to this configuration, the side blade (20
b) After the cutting by (14b) is completed, the cutting edges (20a) and (14a) start cutting, so that the corner (A) can be cut by a continuous cutting line.
Therefore, the corner of the cut piece can also be smoothly sheared, compared to a conventional device that breaks and cuts the corner.
The required power is reduced, and the object to be cut can be reliably punched with less power.

The blade surface of the side blade provided on either one of the jaw members may be a stepped surface with a step portion interposed therebetween and the blade edge side protruding toward the closing direction side of the jaw member beyond this step portion. May be formed.

According to this configuration, as shown in FIG. 3, when the cutting operation by the side blades (20b) and (14b) has progressed to some extent (cutting line), the step (16) provided on the side blades is changed. After piercing the object to be cut, thereafter, as shown by the cutting line, cutting is started simultaneously at two places before and after the step portion (16) toward the cutting edge side. Therefore, the side blade (20b) (14
The cutting operation according to b) can be terminated early, and the time required for punching the object to be cut can be reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows the overall structure of the device of the present invention. The punch-type cutter includes a rotary bracket (1) and a main body (2) disposed in front of the rotary bracket (1). The rotary bracket (1) is attached to the tip of an arm (not shown) of a working machine, for example, a power shovel by pin connection. Inside the rotary bracket (1), a hydraulic motor having an output shaft connected to the main body (2) is incorporated. When the hydraulic motor is driven forward and backward, the punch type cutter rotates forward and backward around the axis p. Perform Therefore, the arm of the power shovel is bent and stretched appropriately, and
If the hydraulic motor is driven forward and backward, the punch-type cutter can be freely moved to a position where the work according to the posture of the workpiece can be easily performed.

The main body (2) is composed of a pair of jaw members (4) and (5) arranged like scissors. Jaw members (4) (5)
Among them, the lower jaw member (4) has its base fixed to one end of the rotary bracket (1) (hereinafter, this jaw member (4) is referred to as a fixed lower jaw), while the upper jaw is The member (5) is attached to the fixed lower jaw (4) via a pivot (6) so as to be openable and closable (hereinafter, this jaw member (5) is referred to as a movable upper jaw).

As shown in FIG. 2, a hydraulic cylinder (7) is built in the internal space of the fixed lower jaw (4) and the movable upper jaw (5). The cylinder end of the hydraulic cylinder (7) is pivotally attached to the movable upper jaw (5) via a cylinder pin (8) behind the pivot (6). The piston rod (7a) of the hydraulic cylinder (7) is pivotally attached to the lower part of the fixed lower jaw (4) via a rod pin (9). Therefore, when the hydraulic cylinder (7) is advanced and retracted, the movable upper jaw (5) swings up and down around the pivot (6), and both jaws (4) and (5) open and close like scissors.

In addition, while the upper jaw (5) is fixed,
The lower jaw (4) may be movable, and both jaw members (4) and (5) may be movable. A through hole (1) having a rectangular horizontal cross section is provided between the bottom of the fixed lower jaw (4) and the upper surface (abutment surface) in order to discharge the cut piece to the outside.
1) is formed. At the front end and both side ends of the upper opening of the through hole (11), a fitting groove is formed, and the lower cutting blade (14) is detachably attached to the fitting groove using a fastening means such as a bolt. ing. Each of the lower cutting blades (14) has an elongated rectangular columnar lower tip blade (14).
a) and a pair of lower side blades (14b), which are composed of three members. These members have both lower side blades (14b) arranged in parallel, and a lower tip blade (14a) at right angles to the front end thereof. By arranging, they are arranged in a U-shape.

The blade surfaces (15b) of both lower side blades (14b)
A step portion (16) is interposed therebetween and the cutting edge side of the step portion (16) is formed on a stepped surface protruding upward in the closing direction of the jaw members (4) and (5), specifically, upward. . Among the blade surfaces (15b) of both lower side blades (14b), the blade surface closer to the blade edge than the step (16) and the blade surface (15a) of the lower tip blade (14a) are:
They are formed on the same plane.

On the lower surface (abutment surface) of the movable upper jaw (5), an upper tip blade (20a) and a pair of upper side blades (20b) are formed in a U-shape similarly to the lower cutting blade (14). The upper cutting blades (20) arranged side by side are detachably mounted using bolts or the like. The upper tip blade and the side blades (20a) and (20b) are arranged to fit inside the lower tip blade and the side blades (14a) and (14b) with a slight gap therebetween.

The blade surface (21a) of the upper tip blade (20a) is V
The upper and lower blades (20b) have both ends coplanar with both cutting surfaces (21b). Inside the upper cutting blade (20), a plurality of block bodies (22) are mounted in a line from the cutting edge to the cutting edge. With this block body (22), the abutment surface of the movable upper jaw (5)
A bulging portion (23) is formed which protrudes below the blade surfaces (21a) and (21b) of the upper cutting blade (20).

In such a configuration, when the hydraulic cylinder (7) is advanced and the movable upper jaw (5) is closed, first, the bulging portion (23) comes into contact with the object to be cut, and the material to be cut is in the bulging portion ( Two
It is pressed in 3) and deforms into a substantially V-shape. In this state, when the closing operation is further continued, the respective blade surfaces (15a) (21a) of the tip blades (14a) (20a) and the side blades (14b) (20b).
(15b) Of (21b), the corners are in line contact with the object to be cut to produce a notch effect. As a result, the object to be cut can be cut with less power.

At the beginning of cutting, the upper and lower side blades (20b) (14
b) Meshing with each other to cut the object to be cut. As shown in FIG. 3, when the cutting operation by the side blades (20b) and (14b) progresses to some extent (shown by a cutting line), the lower side blade (14b)
The step (16) of b) breaks through the object to be cut, and thereafter, as shown by the cutting line, the cutting operation proceeds simultaneously toward the cutting edge at two positions before and after the step (16). Therefore, the cutting operation by the side blades (20b) and (14b) can be speeded up.

When the cutting operation is performed simultaneously at two places in this way, the closing power of the movable upper jaw (5) is dispersed at two places, and there is a concern that the shearing force at both cutting places is insufficient. If the step (16) is provided on the side of the blade edge where the shearing force is large, such a problem can be solved and the cutting can be performed at a stroke without being interrupted on the way. That is, this configuration is intended to speed up the cutting operation by utilizing the surplus cutting force on the side of the cutting edge having a sufficient cutting force.

During cutting by the side blades (20b) and (14b),
Since the blade surface (21) of the upper tip blade (20a) is depressed in a substantially V shape, the upper and lower tip blades (20a) (14a) do not mesh until the cutting line reaches the corner (A). Therefore, during this time, the tip blades (20a) (14a) move the object (2
5) Never cut.

The cutting operation by the side blades (20b) and (14b) is completed. As shown in FIG.
When it reaches the upper edge, the upper and lower tip blades (20a) and (20b) start to mesh with each other, and the object to be cut is cut from the corner (A) toward the center (indicated by a cutting line). When the cutting lines from both corners (A) match on the center line qq,
The object to be cut is cut into a rectangular piece, and the cut piece is discharged to the outside through the through hole (11) of the fixed lower jaw (4).

As described above, according to the present invention, the side blade (20b)
After the cutting by (14b) is completed, the tip blade (20
a) Since cutting by (14a) is started, the corner portion (A) can be cut by a continuous cutting line.
Therefore, the corners of the cut pieces are also smoothly sheared, and the power required to complete the cutting can be reduced, and the object to be cut can be reliably formed into a rectangular piece with less power compared to a conventional device that breaks and cuts off the corners. It becomes possible to cut.

In general, in the cutter, even if the driving force of the movable upper jaw (5) is constant, the cutting force on the cutting edge side is smaller than that on the cutting edge side due to the principle of leverage. Further, in the cutter according to the present embodiment, the closer the movable upper jaw (5) is closed, the smaller the distance from the axis of the hydraulic cylinder (7) to the pivot (6) (see FIG. 2). Accordingly, the driving force of ()) also decreases toward the closing side. From such a point, in the conventional apparatus, the cutting failure frequently occurs in the corner portion (A) which is the final stage of the cutting. On the other hand, in the present invention, as described above, the power required for cutting the corner portion (A) is reduced, so that a cutting failure can be reliably avoided even with a small power.

By the way, in the above-mentioned structure, since the cutting lines from the two directions coincide on the center line qq, the same problem (increase in required power or cutting failure) as the conventional device may occur. However, since the apparatus of the present invention has a structure in which two parallel cutting lines coincide with each other, and has a structure different from that of the conventional apparatus in which two perpendicular cutting lines intersect, the center line q
The object (25) on -q is cut smoothly by shearing, not by breaking. Therefore, there is no possibility that such a problem will occur.

In the above description, the upper and lower tip blades (20
a) Of (14a), the blade surface (21) of the upper tip blade (20a)
Although a) is depressed into a V-shape (see FIG. 5A),
The blade surface (15a) of the lower tip blade (14a) may be depressed into a V-shape (see FIG. 2B), and both blade surfaces (21a) and (15a) are depressed into a V-shape. (See FIG. 3C). Also, the shape of the blade surfaces (21a) (15a) of the tip blades (20a) (14a) need not be a perfect V-shape, but any shape approximate to the V-shape is sufficient.
It may be asymmetrical with respect to q.

In the above description, the upper and lower side blades (20
b) Of (14b), the step (1) is attached to the lower side blade (14b).
6), the upper side blade (20
A step (16) may be provided in b) (see FIG. 6). However,
When the step (16) is provided on the lower side blade (14b), the object to be cut is more easily caught on the step (16) than when the step (16) is provided on the upper side blade (20b). The advantage is obtained that the posture of the object placed on the fixed lower jaw (4) can be stably maintained even before the movable upper jaw (5) is closed. In addition, when the step portion (16) is provided on the upper and lower side blades (20b) (14b), the force for punching a hole is larger than the force for cutting an object to be cut. And
Since the time required to complete the cutting is lengthened, it is desirable to provide a step (16) on one of the upper and lower side blades.

The block body (22) has an irregular wave shape as shown in FIG. 7, and the block element (22a) closest to the pivot (6) has the smallest waveform and the block farthest from the pivot (6). It is also possible to maximize the waveform of the element (22c) and prevent the workpiece (25) from escaping to the cutting edge side due to the engagement with the block body (22). Preferably, the axis (6) side of the block element (22a) is straightened from the middle, and the first waveform of the block element (22a) is used to cut the workpiece (2
If 5) is stopped, the force of the hydraulic cylinder (7) can be maximized to act on the workpiece (25). The waveform of the block body (22) projecting downward from the upper cutting blade (20) bends the object to be cut downward so that the cut rectangular piece easily passes through the through hole (11).

[0031]

As described above, according to the present invention, since the blade surface of the tip blade is depressed into a substantially V-shape, the tip blade starts cutting after the cutting by the side blade is completely completed. The square blade and the tip blade can cut the adjacent corners with a continuous cutting line, and the corners of the cut pieces can be smoothly sheared, requiring less power than conventional equipment and reliably cutting with less power It becomes possible to bite things.

Further, a step is formed on the blade surface of the side blade, and the height of the blade is made higher at the blade tip side of the step. The step provided breaks through the object to be cut, and thereafter the cutting is started toward the cutting edge side at two places before and after the step at the same time, so that the cutting work by the side blade can be terminated early, The time required until the object to be cut can be shortened.

[Brief description of the drawings]

FIG. 1 is a perspective view of a rectangular cutter according to the present invention.

FIG. 2 is a side view of the rectangular cutter.

FIG. 3 is a plan view showing a procedure for cutting an object to be cut in the rectangular cutter.

FIG. 4 is a plan view of a lower jaw meshing surface showing a cutting procedure.

FIGS. 5A to 5C are front views showing an embodiment of the present invention.

FIG. 6 is a side view showing an embodiment of the present invention.

FIG. 7 is a side view of a modified example of the block body.

FIG. 8 is a perspective view showing an example of the arrangement of cutting blades in a conventional device.

FIG. 9 is a plan view showing a procedure for cutting an object to be cut in a conventional apparatus.

[Explanation of symbols]

 Reference Signs List 4 fixed lower jaw 5 lower moving upper jaw 6 pivot 7 hydraulic cylinder 11 through hole 14 lower cutting blade 14a lower tip blade 14b lower side blade 20 upper cutting blade 20a upper tip blade 20b upper side blade 22 block body

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A-7-32208 (JP, A) JP-A-7-4071 (JP, A) JP-A 1-151846 (JP, U) JP-A 57-32 96725 (JP, U) Fully open 1986-131446 (JP, U) (58) Fields studied (Int. Cl. ⁶ , DB name) B23D 17/00-17/06 E04G 23/08 E02F 3/36

Claims (2)

(57) [Claims] 1. A jaw member having a pair of jaw members which open and close about a pivot, and a U-shaped cutting blade comprising a tip blade and a pair of side blades are provided on each abutting surface of both jaw members. The cutting blade of the member is engaged with the cutting blade of the other jaw member to cut the object to be cut into a rectangular piece, and the blade surface of the tip blade provided on one or both jaw members is substantially V
A rectangular cutting machine characterized by being depressed into a letter shape. 2. A stepped surface in which a blade surface of a side blade provided on any one of the jaw members has a step portion interposed therebetween, and a blade edge side protruding from the step portion in a closing direction side of the jaw member. 2. The rectangular cutter according to claim 1, wherein the cutter is formed in a rectangular shape.