JP2728864B2 - Steel shearing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel shearing machine which is attached as an attachment to the tip of an arm of a working machine such as a power shovel and is used for cutting steel at a scrap dismantling site or the like.

[0002]

2. Description of the Related Art A steel shearing machine is attached as an attachment to an arm tip of a working machine such as a power shovel.
It is used for cutting steel at scrap dismantling sites. Although there are various types of steel shearing machines, generally, an upper jaw and a lower jaw having a shearing blade are supported so as to be openable and closable like scissors.

FIG. 5A shows an example of such a steel shearing machine, in which two shearing blades (21), (22) and two are respectively connected to an upper jaw (2) and a lower jaw (3) which are pin-connected at one point. (31)
(32) is attached. Each of the shearing blades has a rectangular parallelepiped shape, and is attached to the upper and lower jaws (2) and (3) so as to be bent in a U shape. As shown in FIG. 6, the shearing blades (21) and (31) on the cutting edge side and the shearing blades (22) and (32) on the cutting edge side
It is arranged in a zigzag pattern with the middle point (the bent point in the shape of a letter) in a staggered manner. The arrangement relationship of the upper and lower shearing blades (21) and (31) on the cutting edge side with the middle point as the boundary, and the cutting edge Shear blade on the side (2
2) The arrangement relationship of (32) is reversed (FIGS. 5 and 6)
The shaded part in the middle indicates the blade on the near side, and the white part indicates the blade on the opposite side.)

At the middle point (bending point) between the upper and lower shearing blades, the cutting edge side corners (28) and (38) of the cutting edge side shearing blades (21) and (31) are attached to both jaw members (2) and (3). Steps (25) and (35) are formed to protrude inward in the opening and closing direction. Such a step (25)
(35) is provided because a time difference is formed between the shear traveling from the cutting edge toward the intermediate point and the shear traveling from the cutting edge toward the intermediate point. Shearing surfaces of shearing blades (21) and (31) and cutting edge side shearing blades (22) and (32)
This is to prevent better contact with the sheared surface of the steel sheet at the same time, thereby ensuring better sharpness with less power.

There is no interference between the upper and lower shearing blades in the final stage of shearing between the shearing blades (21) and (31) on the cutting edge side and the shearing blades (22) and (32) on the cutting edge side. Thus, a gap (G) having a predetermined width is provided. That is, at the final stage of the shearing, as shown in FIG. 5B, a continuous gap (G ′) remains between the shearing blades (21) and (32) and between the shearing blades (22) and (31). Thus, a gap (G) having a predetermined width is provided.

[0006]

However, in the shearing machine shown in FIG. 5, since there is a gap (G) at an intermediate point between the upper and lower shearing blades, there are various conditions such as the shape, plate thickness, and shearing speed of the steel material. The steel material in the middle of shearing strongly bites into this gap,
There was a case where it could not easily come out and hindered the subsequent work.

As shown in FIG. 7, the gap (G) can be eliminated by extending the cutting edge side of the cutting blades (21) and (31) on the cutting edge side to the cutting edge side. In the final stage of the shearing, as shown in FIG. 8, the corners of the shearing blades (21) and (32) on the near side, that is, the corner (28) of the blade edge side of the blade edge side shearing blade (21) and the blade edge The edge of the side shearing blade (32) interferes with the edge (39) of the cutting edge, and similarly, the corners of the shearing blades (22) and (31) on the opposite side,
That is, since the cutting edge side corner portion (38) of the cutting edge side shearing blade (31) and the cutting edge side corner portion (29) of the cutting edge side shear blade (22) interfere with each other, the upper jaw (2) is completely closed. And shearing of the steel material becomes impossible.

Therefore, according to the present invention, the object to be sheared can be prevented from biting into the gap with a simple structure, and the object to be sheared can be completely completely sheared from the start to the end of shearing. The purpose is to provide a steel shearing machine.

[0009]

In order to achieve the above-mentioned object, according to the present invention, the upper jaw and the lower jaw, which are mounted as attachments on the end of an arm of a working machine such as a power shovel and are opened and closed, are bent in a C-shape. Attach the shearing blades, dispose the upper and lower shearing blades in a staggered relationship between the cutting edge side and the cutting edge side at the middle point of the upper and lower shearing blades, and set the cutting edge side at the midpoint between the upper and lower shearing blades. In the case of forming a step such that the blade base side end of the shear blade protrudes inward in the opening and closing direction, the blade base side end of the blade edge side shear blade facing the step and the blade base side of the blade base side shear blade The end portions are arranged with no gap in the front-rear direction therebetween, and the narrow angle therebetween is set to be approximately 90 ° or larger, and the cutting edge side corner portion of the shearing blade on the cutting edge side is arranged. Was formed at an obtuse angle.

Further, the shape of the shearing blade on the cutting edge side is a flat hexagonal shape composed of two long opposing sides forming the edge of the shearing blade and a bent side connecting both ends of the two opposing sides in a V-shape. did.

As described above, if the gap between the shearing blade on the cutting edge side and the shearing blade on the cutting edge side is eliminated, the steel material cannot be caught in the gap. In addition, if the narrow angle between the cutting edge side shearing blade and the cutting edge side shearing blade is set to approximately 90 ° or larger, it is possible that the upper and lower shearing blades may interfere with each other even in the final stage of shearing. In addition, the jaws can be securely engaged to the end.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete structure of a steel shearing machine according to the present invention will be described below with reference to FIGS.

As shown in FIG. 1, a steel shearing machine (1) according to the present invention is constructed by connecting an upper jaw (2) and a lower jaw (3) to a shearing machine main body (not shown) at one point (4). Is done.
The main body of the shearing machine is mounted on the tip of an arm of a working machine such as a power shovel via a hydraulic turning mechanism (not shown) that can turn in a 360 ° direction, so that the shearing machine can freely turn in the direction of the arrow. The upper jaw (2) is driven to open and close about a pin (4) by a hydraulic cylinder (not shown), while the lower jaw (3) is fixed to the shears body. Of course, the lower jaw (3) is also movable and the upper and lower jaws (2) (3)
May be opened and closed. In this case, the lower jaw (3) and the upper jaw (2) may be supported by independent pins so as to be openable and closable.

The opposing portions of the upper jaw (2) and the lower jaw (3) are formed in a zigzag shape in plan view and in a V shape in side view. The two shearing blades (21) (22) and (31) (32) are detachably mounted with bolts or the like. These shearing blades (21)
Of (22), (31), and (32), the shearing blade on the cutting edge (21)
(31) is formed in a flat hexagonal shape having a rectangular longitudinal section and two long sides facing each other, which are edges of the shearing blade when viewed from the side, and a V-shaped bent side connecting the two sides. Have been. On the other hand, the shearing blades (22) and (32) on the blade side are formed in a rectangular parallelepiped shape.

As for the upper shearing blades (21) and (22), the shearing blade (21) on the cutting edge side is on the near side, and the shearing blade (22) on the cutting edge side.
The lower shearing blades (31) and (32) are arranged such that the cutting edge side shearing blade (32) is on the near side and the cutting edge side shearing blade (31) is on the opposite side ( The shear blade located on the near side is indicated by oblique lines). That is, as shown in FIG.
The upper and lower shearing blades (21) on the cutting edge side of the intermediate point of each of the upper and lower shearing blades (21), (22), (31), and (32) with respect to each intermediate point (curved point). The arrangement relationship of (31) and the arrangement relationship of the shearing blades (22) and (32) on the blade side are completely reversed with the shear plane as a boundary. The term “reversely arranged in a staggered manner” in the claims refers to such an arrangement relationship.

Upper and lower shearing blades (21) (22) and (31) (32)
If the shearing blades are not arranged in a zigzag pattern and are normally arranged in a row, the upper shearing blade and the lower shearing blade will separate horizontally in the horizontal direction due to the reaction force received from the steel material during shearing, resulting in a lateral gap. The sharpness is worsened, but by arranging the shearing blades in a zigzag pattern, the force of the lateral opening between the cutting edge side and the cutting edge side is opposite to each other at the middle point and cancels each other. As a result, the same sharpness as when no lateral opening force from the steel material acts can be obtained.

The upper shearing blades (21) and (22) and the lower shearing blades (31) and (32) have a shape that is bent in a V-shape outward in the opening and closing direction of the jaws (2) and (3). In addition, the edge of the cutting edge of the shearing blade (21) (31) on the cutting edge side is more jaw than the edge of the cutting edge of the shearing blade (22) (32) on the cutting edge side. 2) It protrudes slightly inside the opening and closing direction of (3). Therefore, a step (25) (3) between the cutting edge and the cutting edge
5) is formed. These steps (25) and (35) are steps that go up one step toward the cutting edge (or go down one step in the case of the upper shearing blade). During shearing, the cutting edge side shearing blade (21) in a wide area across the intermediate point (31) and blade side shear blade (22)
This prevents the sheared surface of (32) from sticking to the steel plate and enables shearing with less power.

The shearing blades (21) and (31) on the cutting edge side and the shearing blades (22) and (32) on the cutting edge side are arranged close to each other so as to eliminate a gap in the front-rear direction. That is, as shown in FIG. 3 in an enlarged manner, the blade-side end surface (26) of the shear blade (21) (31) on the blade edge side.
(36) and the cutting edge (22), (32)
7) (37) is matched and arranged on a common plane. When the gap is eliminated in this manner, the steel material does not bite strongly between the shear blades (21) and (31) on the cutting edge side and the shear blades (22) and (32) on the cutting edge side as in the conventional product. The shearing operation can be stably continued.

The narrow angle α between the blades (21) and (31) on the blade edge side and the blades (22) and (32) on the blade base side at the intermediate point is set to 90 °. At this angle, for example, the front shearing blade (2
Considering 1) and (32), as shown in FIG. 4, in the shearing process, the cutting edge side corner portion (28) of the cutting edge side upper shearing blade (21) becomes the cutting edge side lower shearing blade (32). Of the cutting edge side (3
It does not interfere with 9). Although not shown, the same applies to the shearing blades (22) and (31) on the opposite side. Therefore,
Even when the gap is eliminated, the upper jaw (2) can be reliably closed to the fully closed position, and the steel material can be stably completely sheared. Even if the narrow angle α is larger than 90 °, interference between the corners (28) and (39) similarly does not occur, so the narrow angle α may be 90 ° or more.

The narrow angle α may be slightly smaller than 90 °. This is because if the opening / closing center axis (4) of the upper jaw (2) is located at the intersection of the vertical shear planes of the blade side shear blades (22) and (32), the narrow angle α is 90 °. In practice, however, as shown in FIG. 4 (a), the shear planes (A) and (B) are offset from the central axis (4), so that they are slightly less than 90 °. This is because interference may not occur even if it is small. The reason why "approximately 90 degrees" is used in the appended claims is as follows.

In the shearing machine described above, hexagonal blades are used as the shearing blades (21) and (31) on the cutting edge side, but the shape of the shearing blade is arbitrary. However, the blade side corner (28)
When the angle β of (38) is 90 ° or less, the shearing surfaces of the upper and lower shearing blades (21), (22), (31), and (32) are opened forward, that is, bent in a reverse U-shape, The angle β must be an obtuse angle greater than 90 ° because it will not function as a shear. In short, the shearing blades (21) and (31) on the edge side
Any shape may be used as long as the angle β is obtuse. For example, a trapezoid or a pentagon may be used. In addition, if it is a hexagon as described above, it is possible to repeatedly use the blade by using the four edges by turning over the cutting edge side shearing blades (21) and (31), or by turning the blade upside down. This is convenient. Further, the shearing blades (21) and (31) may be polygons having a heptagon or more. However, when the angle β is extremely large, the intersection angle between the upper and lower cutting edge side shearing blades (21) and (31) becomes too large. To reduce the shearing force, it is desirable to make the shape approximately hexagonal.

[0022]

As described above, according to the present invention, since there is no longitudinal gap between the shearing blade on the cutting edge side and the shearing blade on the cutting edge side, the steel material does not bite into the gap. The shearing operation can be stably continued. Also, since the narrow angle between the cutting edge side shearing blade and the cutting edge side shearing blade is approximately 90 ° or an angle larger than this, the blades do not interfere with each other even in the final stage of shearing. The steel material can be reliably sheared to the end. Further, by making the cutting edge side corner portion of the shearing blade on the cutting edge side an obtuse angle, the shearing surfaces of the upper and lower shearing blades are maintained in a shape that is ineffective for preventing the front slip of the steel material, and good sharpness is secured. .

Also, the shape of the shearing blade on the cutting edge side is a flat hexagonal shape composed of two long opposing sides forming the edge of the shearing blade and a bent side connecting both ends of the two opposing sides in a V-shape. Then, even when one edge of the shearing blade is worn, the blade can be repeatedly used by turning over the blade or turning the blade upside down.

[Brief description of the drawings]

FIG. 1 is a side view of a steel shearing machine according to the present invention.

FIG. 2 is a perspective view showing an arrangement of shearing blades.

FIG. 3 is an enlarged side view of a shearing blade.

FIG. 4 is a side view showing the position of the blade during shearing (a) and immediately after shearing (b).

FIG. 5 (a) is a side view of a conventional steel shearing machine,
(B) is a plan view showing the positional relationship of the respective shearing blades in the final stage of shearing.

FIG. 6 is a perspective view showing an arrangement of conventional shearing blades.

FIG. 7 is a side view showing a modified example of the shearing blade.

FIG. 8 is a side view showing a shearing state by a deformed shearing blade.

[Explanation of symbols]

 1 Steel shearing machine 2 Upper jaw 3 Lower jaw 4 Pin 21 Cutting edge side shearing blade (front side) 31 Cutting edge side shearing blade (opposite side) 22 Cutting edge side shearing blade (opposite side) 32 Cutting edge side shearing blade (front side) 25 ・ 35 steps 28 ・ 38 Edge side corner α Narrow angle β Edge side corner

Claims (2)

(57) [Claims] 1. An upper and lower jaw to be opened and closed, each of which is attached to a tip of an arm of a working machine such as a power shovel as an attachment. As a boundary, the arrangement of the upper and lower shearing blades on the cutting edge side and the cutting edge side is reversed in a staggered manner, and the cutting edge side edge of the cutting edge on the cutting edge side is located at the middle point between the upper and lower shearing blades in the opening and closing direction. In the one in which a step is formed so as to protrude, the cutting edge side end of the shearing blade on the cutting edge side facing the step and the cutting edge side end of the shearing blade on the cutting edge side, eliminating the longitudinal gap therebetween. A steel shearing machine characterized in that a narrow angle between them is set to be approximately 90 ° or larger, and the cutting edge side of the shearing blade on the cutting edge side is formed at an obtuse angle. 2. A shape of a shearing blade on a cutting edge side is a flat hexagonal shape including two long opposing sides forming an edge of the shearing blade and a bent side connecting both ends of the two opposing sides in a V-shape. The steel material shearing machine according to claim 1, wherein