JPH0978856A - Steel shearing machine - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To prevent a material to be sheared from being caught in a gap with a simple structure and to stably shear a steel material from the start of shearing to the end of shearing. SOLUTION: The upper jaw (2) and the lower jaw (3) are bent in a dogleg shape to form shear blades (21) (22), (31) (3).
Install 2) in a zigzag arrangement and install steps (25) (35) at the midpoint between the upper and lower shear blades. This step (25) (3
Place the shearing blades (21) (31) on the cutting edge side facing the edge of 5) and the cutting edge side ends of the shearing blades (22) (32) on the cutting edge side with no gap in the front-rear direction. , The narrow angle α is set to about 90 °. Further, the angle β of the corner portion on the blade base side of the shearing blade (21) (31) on the blade tip side is an obtuse angle.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A steel material shearing machine is attached to an arm tip of a working machine such as a power shovel as an attachment.
Used for cutting steel materials at scrap dismantling sites. There are various types of the steel material shearing machine, but generally, the upper and lower jaws having shearing blades are supported by scissors so as to be openable and closable.

FIG. 5 (a) is an example of such a steel material shearing machine, in which two shearing blades (21) (22) are respectively provided on the upper jaw (2) and the lower jaw (3) which are pin-connected at one point. (31)
It is equipped with (32). Each of the shear blades has a rectangular parallelepiped shape and is attached to the upper and lower jaws (2) and (3) by bending them in a dogleg shape. As shown in FIG. 6, the cutting edge side shear blades (21) (31) and the blade edge side shear blades (22) (32) are
They are arranged in a zigzag pattern at their midpoints (curve-shaped bending points) as boundaries, and the arrangement relationship between the upper and lower shear blades (21) (31) at the cutting edge side and the blade base. Shearing blade on the side (2
2) The arrangement relationship of (32) is reversed (Figs. 5 and 6).
The shaded portion in the middle shows the blade on the front side, and the white background shows the blade on the other side).

At the midpoint (bending point) of the upper and lower shear blades, the corners (28) (38) on the blade base side of the blades (21) (31) on the cutting edge side are attached to both jaw members (2) (3). Steps (25) and (35) are formed so as to project inward in the opening / closing direction. Such steps (25)
(35) is provided because a time difference is formed between the shear that progresses from the cutting edge side toward the midpoint and the shear that progresses from the cutting edge side toward the midpoint so that the steel plate is at the cutting edge side at the end of shearing. Shear surface of shear blade (21) (31) and blade side shear blade (22) (32)
This is because it is possible to secure a better sharpness with a small amount of power by preventing simultaneous contact with the shearing surface of.

There is no interference between the shearing blades (21, 31) on the cutting edge side and the shearing blades (22, 32) on the cutting edge side in the meshing of the upper and lower shearing blades at the final stage of shearing. As described above, a gap (G) having a predetermined width is provided. That is, in the final stage of shearing, as shown in FIG. 5B, continuous gaps (G ′) remain 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 the midpoint between the upper and lower shearing blades, it may depend on various conditions such as the shape of the steel material, the plate thickness, or the shearing speed. , The steel material in the middle of shearing strongly bites into this gap,
In some cases, it was difficult to get out of the way and interfere with the subsequent work.

As shown in FIG. 7, the gap (G) can be eliminated by extending the blade base side ends of the blade-side shear blades (21) (31) to the blade base side. Then, as shown in FIG. 8, at the final stage of shearing, the corners of the shear blades (21) (32) on the front side, that is, the corners (28) of the cutting edge side shearing blade (21) and the cutting edge of the cutting edge side The corner portions (39) of the side shear blades (32) interfere with each other, and the corner portions of the shear blades (22) (31) on the other side similarly,
That is, since the cutting edge side corner portion (38) of the cutting edge side shear 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. It is impossible to shear the steel material.

Therefore, in the present invention, it is possible to prevent the object to be sheared from being caught in the gap with a simple structure, and moreover, the object to be sheared can be smoothly and completely sheared from the start of shearing to the end of shearing. The purpose is to provide a steel material shearing machine.

[0009]

In order to achieve the above object, according to the present invention, the upper and lower jaws, which are attached to the tip of the arm of a work machine such as a power shovel as an attachment, are bent in a dogleg shape. With the shear blade attached, the upper and lower shear blades are arranged in a staggered arrangement on the cutting edge side and the blade base side with the middle point of the upper and lower shear blades as a boundary, and the cutting edge side is located at the middle point of the upper and lower shear blades. In the case where a step is formed such that the blade-base-side end of the shear blade projects inward in the opening / closing direction, the blade-base-side end of the blade-side shear blade facing the step and the blade-side of the blade-side shear blade The end portions are arranged so that there is no gap in the front-rear direction between them, and the narrow angle between them is set to about 90 ° or an angle larger than this, and the edge portion of the shear blade on the blade tip 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 bent sides connecting both ends of the opposing two sides in a V shape. did.

As described above, if the gap between the cutting 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 clearance. Further, if the narrow angle between the cutting blade on the cutting edge side and the cutting blade on the cutting edge side is set to about 90 ° or an angle larger than this, the upper and lower shearing blades may not interfere with each other even in the final stage of shearing. Without, both jaws can be reliably engaged until the end.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A concrete structure of a steel material shearing machine according to the present invention will be described below with reference to FIGS. 1 to 4.

As shown in FIG. 1, a steel material shearing machine (1) according to the present invention is constructed by pin-connecting an upper jaw (2) and a lower jaw (3) to a shearing machine body (not shown) at one point (4). To be done.
The shearing machine main body is attached to the arm tip of a working machine such as a power shovel via a hydraulic swinging mechanism (not shown) capable of swinging in the direction of 360 °, whereby the shearing machine can swing in the arrow direction. The upper jaw (2) is driven to open and close around 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, and in that case, the lower jaw (3) and the upper jaw (2) may be openably and closably supported by independent pins.

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

Regarding the upper shearing blades (21) (22), the shearing blade (21) on the cutting edge side is on the front side, and the shearing blade (22) on the cutting edge side.
Is arranged on the opposite side, and with respect to the lower shear blades (31) (32), the shear blade (32) on the blade base side is arranged on the front side, and the shear blade (31) on the cutting edge side is arranged on the opposite side ( The shearing blade located on the front side is shown with diagonal lines). That is, as shown in FIG.
The upper and lower shear blades (21) (22), (31) and (32) are separated from each other by the midpoints (curve-shaped bending points) of the upper and lower shear blades (21) located closer to the cutting edge than the midpoints. The arrangement relationship of (31) and the arrangement relationship of the shearing blades (22) (32) on the blade base side are completely reversed at the shear plane. In the claims, "the zigzag reverse arrangement" means such an arrangement relationship.

Upper and lower shear blades (21) (22), (31) (32)
If they were not arranged in a zigzag pattern and were normally arranged in a line, the upper shear blade and the lower shear blade would be separated horizontally due to the reaction force received from the steel material during shearing, creating a lateral gap. Although the sharpness is poor, by arranging the shearing blades in a zigzag pattern in reverse, the lateral opening forces on the cutting edge side and the cutting edge side are opposite to each other at the midpoint, and they cancel each other out. It is possible to obtain the same sharpness as when the lateral opening force from the steel material does not act at all.

The upper shearing blades (21) (22) and the lower shearing blades (31) (32) are bent in a dogleg shape outward in the opening / closing direction of both jaws (2) (3). The edge of the shear blades (21) (31) on the cutting edge side is closer to the jaw than the edge of the shear blades (22) (32) on the cutting edge side. 2) A little protruding inward in the opening / closing direction of (3). Therefore, there is a step (25) (3) between the cutting edge side and the blade side shear blade.
5) has been formed. This step (25) (35) is a step that goes up one step toward the cutting edge side (it goes down one step in the case of an upper shearing blade), and at the time of shearing, the cutting edge side shearing blade (21) in a wide area sandwiching the midpoint. (31) and blade side shear blade (22)
It prevents the sheared surface of (32) from hitting the steel plate and enables shearing with less power.

The shearing blades (21, 31) on the cutting edge side and the shearing blades (22, 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 the enlarged view of FIG. 3, the blade-side end surface (26) of the blade-side shear blade (21) (31).
(36) and the cutting edge side end face (2) (32) (2)
7) Match (37) with (37) and place them on a common plane. If the gap is eliminated in this way, unlike the conventional product, the steel material will not be strongly caught between the shearing blades (21) (31) on the blade base side and the shearing blades (22) (32) on the blade tip side, It becomes possible to continue the shearing work stably.

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

The narrow angle α may be slightly smaller than 90 °. This means that if the central axis (4) of opening and closing of the upper jaw (2) exists at the intersection of the vertical shear planes of the blade-side shear blades (22) (32), the narrow angle α is 90 °. However, in reality, as shown in FIG. 4 (a), the shear planes (A) and (B) are at positions offset from the central axis (4), and therefore, slightly less than 90 °. This is because interference may not occur even if it is small. It is for this reason that "about 90 °" is used in the claims.

In the shearing machine described above, hexagonal blades are used as the blade-side shearing blades (21) (31), but the shape of this shearing blade is arbitrary. However, the corner on the blade base side (28)
If the angle β of (38) is 90 ° or less, the shearing surfaces of the upper and lower shear blades (21) (22), (31) and (32) are opened forward, that is, bent in a dogleg shape in the opposite direction, The angle β must be an obtuse angle larger than 90 ° because it will not function as a shear. In short, the cutting blade side shear blades (21) (31)
Any shape may be used as long as the angle β is an obtuse angle, and may be, for example, a trapezoid or a pentagon. 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 shear blades (21) (31) or by turning them upside down. It is convenient because The shearing blades (21) (31) may be polygons of heptagon or more, but when the angle β becomes extremely large, the crossing angle of the upper and lower cutting edge side shearing blades (21) (31) becomes too large. A hexagonal shape is desirable because it will reduce the shearing force.

[0022]

As described above, according to the present invention, since there is no gap in the front-rear direction between the shearing blade on the cutting edge side and the shearing blade on the cutting edge side, the steel material is not caught in the gap. Therefore, the shearing work can be stably continued. Further, since the narrow angle between the blade on the cutting edge side and the blade on the blade edge side 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. In addition, by making the corners of the cutting edge side of the cutting edge on the cutting edge side obtuse, the shearing surfaces of the upper and lower shearing blades are effectively kept in the shape of a letter to prevent the front slip of the steel material, and good sharpness is secured. .

Further, the shape of the shearing blade on the cutting edge side is a flat hexagonal shape consisting of two long opposing sides forming the edge of the shearing blade and curved sides connecting both ends of the opposing two sides in a V shape. Then, even if one edge of the shear blade is worn, it can be repeatedly used by turning the blade over or turning it upside down.

[Brief description of drawings]

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

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

FIG. 3 is an enlarged side view of a shear 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 material shearing machine,
FIG. 6B is a plan view showing the positional relationship of each shear blade at the final stage of shearing.

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

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

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

[Explanation of symbols]

 1 Steel material 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 step 28/38 Edge side corner α Narrow angle β Edge side angle

Claims (2)

[Claims] 1. A shear blade bent in a dogleg shape is attached to each of an upper jaw and a lower jaw to be opened and closed, which is attached to an arm tip of a work machine such as a power shovel as an attachment, and an intermediate point between the upper and lower shear blades is attached. As a boundary, the upper and lower shear blades are arranged in a staggered arrangement on the cutting edge side and the cutting edge side, and at the midpoint between the upper and lower shearing blades, the cutting edge side edge of the cutting edge shearing blade is located inside the opening / closing direction. In what forms a protruding step, 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, eliminate the gap in the front-back direction between them. Further, the steel material shearing machine is characterized in that the narrow angle between them is set to about 90 ° or larger and arranged, and the corner portion on the blade base side of the shearing blade on the blade tip side is formed as an obtuse angle. 2. 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 bent sides connecting both ends of the opposing two sides in a V shape. The steel material shearing machine according to claim 1, wherein