JP4989924B2 - Crushing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crusher capable of always steadily biting into reinforced concrete and applying a great crushing force thereto whichever position of the concrete it may be caused to grip. <P>SOLUTION: The crusher is attached to a hydraulic shovel when it is put in use. It is equipped with a frame to be attached to the tip of a hydraulic shovel and a pair of mobile jaws 3 openably and closably attached to the frame. Each of the mobile jaws 3 is comprised of a protruded tip 31 and a crushing blade 32 extending in the length direction. Each of the crushing blades 32 is comprised of a concavely curved part 32a, a convexly curved part 32b, and a concavely curved part 32c each formed continuously from the protruded tip 31 one after another, with the cross section of the crushing blade 32 having a trapezoidal shape and the top of the convexly curved part 32b having a circular arc shape. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a crusher used by being attached to a hydraulic excavator. In particular, the present invention relates to a crusher suitable for crushing reinforced concrete.

  In the description of the movable jaw in this specification, the front means the left side of FIG. 2 and the rear means the right. In addition, the upper and lower sides follow the upper and lower sides of FIG.

  In order to dismantle a reinforced concrete building, it has been conventionally performed to use a crusher that is attached to a hydraulic excavator. This type of crusher generally includes a frame that is rotatably attached to an arm of a hydraulic excavator and a pair of movable jaws that are attached to the frame so as to be freely opened and closed.

  In the crusher, the concrete is sandwiched between the movable jaws and pressed to generate cracks, and the movable jaws are closed to enlarge the cracks and crush the concrete. In this case, if the force is concentrated on the portion where the concrete is sandwiched, the crack can be generated in the concrete with a small force. Accordingly, various crushers have been proposed in order to concentrate the force.

  An example of such a crusher is described in Japanese Patent Application Laid-Open No. 2004-143683. This crusher is provided with a tip claw formed at the tip of the jaw and a crushing blade formed from the tip claw to the rear end side of the movable jaw, and the crushing blade has a triangular cross section. .

In addition, the crushing blade is curved in a concave shape, a convex shape, or a concave shape from the front end to the rear end, and the top of the convex portion is substantially trapezoidal when viewed from the side.
JP 2004-143683 A

In the conventional crushing machine, since the top of the convex portion of the crushing blade has a substantially trapezoidal shape, the tip corner of the trapezoidal part often hits the object to be crushed such as reinforced concrete. When the corner portion hits the object to be crushed, a large force is applied to the corner portion of the crushing blade, and the corner portion may be lost. If the corner portion is chipped, the function of the trapezoidal convex portion is reduced, the crushing force is weakened, and there is a problem that the efficiency of the subsequent crushing operation is deteriorated. In addition, even when it is not chipped, there is a problem that the wedge effect cannot be exerted when the corner hits, and the bite becomes worse.
Further, the shape of the tip portion of the crushing blade is not an optimum shape for biting into the object to be crushed.

  An object of the present invention is to solve the above-mentioned problem, and by making the shape of the convex part a semicircular shape, a crusher capable of always biting and applying a large crushing force regardless of the position where the reinforced concrete is gripped. The purpose is to provide.

In order to solve the above problems, the crusher of the present invention is
A crusher used by being attached to a hydraulic excavator, comprising a frame attached to the tip of the excavator and a pair of movable jaws attached to the frame so as to be openable and closable. And a crushing blade extending in the length direction, the crushing blade has a concave curved portion, a convex curved portion and a concave curved portion formed in order from the front side, and the cross section of the crushing blade is trapezoidal and convex The top of the curved portion has an arc shape when viewed from the side,
Is.

In the above crusher,
The convex curved portion of the crushing blade is provided at a substantially central portion in the length direction, and may be formed in such a size that the convex curved portion tips are close to each other when the movable jaw is closed.
Furthermore, a tip claw protruding toward the other movable jaw is formed at the tip of the movable jaw,
The width of the front and rear is narrower as the tip claw goes to the tip of the tip claw, and the left and right width of the upper end portion of the tip claw at the tip of the movable jaw is the narrowest .

According to the crusher described in the claims, since the front-rear width of the tip claw is sharpened toward the tip, the tip claw easily bites into the object to be crushed. Further, the left and right widths of the upper end portion of the tip claw in the movable jaw are the narrowest, and the upper portion of the tip claw has a wedge shape. Therefore, after the tip claw bites into the object to be crushed, the portion above the tip claw easily bites into the object to be crushed and the effect of crushing the object to be crushed increases.

Hereinafter, with reference to FIGS. 1-7, the crusher of one Embodiment of this invention is demonstrated. The crusher 1 is used by being attached to an arm A of a hydraulic excavator, and includes a frame 2 that is rotatably attached to the arm A and a pair of movable jaws 3 that are attached to the frame 2 so as to be opened and closed. And a cylinder 4 for opening and closing the movable jaw 3, and the movable jaw 3 is opened and closed in synchronization with a link to crush objects to be crushed such as reinforced concrete.

  Since the structure of each part such as the frame 2, the link, and the cylinder 4 is well known, the movable jaw 3 will be described in detail below. Since the movable jaw 3 is substantially symmetric, one movable jaw 3 will be described mainly with reference to FIG.

The movable jaw 3 has a tip claw 31 formed at the front end so as to protrude inward, that is, toward the other movable jaw 3, and a concave curved portion 32a and a convex curved portion are arranged in order from the front on the rear side of the distal claw 31. A crushing blade 32 constituted by 32b and the concave curved portion 32c is continuously formed. Further, a reinforcing bar cutting blade 33 is attached to the rear side of the crushing blade 32. The crushing blade 32 may be formed integrally by cutting the corresponding part of the movable jaw 3, or the crushing blade 32 formed separately from the movable jaw 3 by welding or screwing is attached to the movable jaw 3. May be.

In addition, when the crushing blade 32 is worn, if the movable jaw 3 and the crushing blade 32 are integrally formed, a new overlay is formed, and if the crushing blade 32 is formed separately, the crushing blade 32 is replaced. Good.

When viewed from the direction shown in FIG. 2, the lower end portion of the movable jaw 3 slightly protrudes forward from the center in the vertical direction. Hereinafter, this projecting portion is referred to as a front projecting portion and is denoted by reference numeral 34. Further, as shown in FIGS. 3A and 3B, the left and right side surfaces of the distal end portion of the movable jaw 3 are formed so as to become thinner toward the forward projecting portion 34. For this reason, as shown in FIGS. 3 (a) and 3 (b), when the front end of the movable jaw 3 is viewed from the front, it has a pyramid shape with the front projecting portion 34 as a vertex.

  That is, the upper side of the front protruding portion 34 of the distal end portion of the movable jaw 3 has a wedge shape. Hereinafter, this portion is referred to as a wedge-shaped portion and indicated by reference numeral 35. A portion below the front projecting portion 34 constitutes the tip claw 31. Further, as shown in FIG. 2, the front and rear claw 31 has a narrow front and rear width as it goes downward. The tip claw 31 is subjected to a surface hardening process. The forward projecting portion 34 may be an arc-shaped point that forms the front portion without being particularly projected.

The cross-sectional shape of the crushing blade 32 is substantially trapezoidal as shown in FIG. The top of the convex curved portion 32b of the crushing blade 32 has an arc shape. Further, the convex curved portion 32b is subjected to surface hardening treatment. As shown in FIG. 6, when the movable jaw 3 is closed and the vertices of the tip claws 31 are in contact with each other, the vertices of the convex curved portions 32b are convex so that they are slightly spaced from each other. The curved portion 32b largely protrudes toward the other movable jaw 3.

In the crusher 1 having the above-described configuration, a reinforced concrete building or the like can be disassembled as described below.

  When crushing a reinforced concrete building, the movable jaw 3 is opened and the reinforced concrete is positioned between the movable jaws 3. In crushing, it is preferable to place reinforced concrete in the back between the movable jaws 3. This is because it is most efficient to crush reinforced concrete with the convex curved portion 32b having a large crushing force. In FIG. 5, the reinforced concrete located in the back between the two movable jaws 3 is denoted by reference numeral S1. The reinforced concrete S1 is sandwiched between the convex curved portions 32b. From this state, the movable jaw 3 is closed to crush the reinforced concrete S1.

Since the top of the convex curved portion 32b has an arc shape, the convex curved portion 32b and the surface of the reinforced concrete S1 can be seen from the side regardless of which part of the top of the convex curved portion 32b hits the reinforced concrete S1. It comes into contact. Further, the cross-sectional shape of the crushing blade 32 is trapezoidal as shown in FIG. 7, and the contact portion seen from the front is also small. Therefore, when the movable jaw 3 is closed, the pressing force is concentrated and applied to the small area of the reinforced concrete S1, and the crushing blade has the same trapezoidal cross-section over the entire length, so the bite is good and the reinforced concrete Cracks along the length direction of the crushing blade 32 can be easily made on the surface of S1. This crack grows as the movable jaw 3 is closed. In addition, the tip claw 31 enters the concrete while exhibiting the wedge effect of the wedge-shaped portion 35, and finally the concrete portion of the reinforced concrete S1 is crushed. Is done.
At this time, even if the convex curved portion 32b or the tip claw 31 of the crushing blade 32 hits the reinforcing bar in the reinforced concrete, since the tip is thin or thin, it efficiently acts on the concrete while spreading the reinforcing bar. The reason why the cross-sectional shape of the crushing blade 32 is trapezoidal is that if the tip is made too thin, the bite is good, but wear and chipping are likely to occur, and this is prevented.

  The rebar of the reinforced concrete S1 is exposed by repeating the above-described operation. The exposed reinforcing bar can be cut with the reinforcing bar cutting blade 33. Reinforced concrete S1 is crushed as described above, but as described above, crushing starts when the area where the convex curved portion 32b and reinforced concrete S1 are in contact with each other is small, and the trapezoidal wedge effect Therefore, the crushing force of the crusher 1 is effectively transmitted to the reinforced concrete S1 and reliably crushed, and the working efficiency is remarkably improved. Therefore, the reinforced concrete S1 can be crushed even with a smaller crusher than before. Further, since the interval between the convex curved portions 32b when the movable jaw 3 is closed is small, the reinforced concrete S1 sandwiched between the convex curved portions 32b is finely pulverized.

  In this crusher 1, even when the reinforced concrete is large and cannot be sandwiched between the convex curved portions 32b, the reinforced concrete can be effectively crushed.

In this case, the reinforced concrete S2 is sandwiched between the tip claws 31. Since the front and rear width of the tip claw 31 is narrow and sharp as it goes to the tip, the contact area between the tip of the tip claw 31 and the reinforced concrete S2 is small, and when the movable jaw 3 is closed, the force concentrates on a part of the surface of the reinforced concrete S2. Join and crack.

As the tip claw 31 bites in, the wedge portion of the wedge-shaped portion 35 and the blade of the concave curved portion 32a work efficiently, and the crack formed by the tip claw 31 and the concave curved portion 32a increases as the movable jaw 3 closes, Eventually, the concrete part of reinforced concrete S2 is crushed.
Since the tip claw 31 and the entire crushing blade 32 that are in contact with the crushed material have a cross-sectional shape that is thin on the inside and thickens toward the outside, depending on the shape of the crushed object, no matter which part comes first, Encroach and crush reliably. In particular, the convex curved part in the center is large and protrudes in a semicircular shape. Can be done efficiently.

  As mentioned above, although the crusher of one Embodiment of this invention was demonstrated, the crusher of this invention is not restricted to the thing of the said embodiment, It can change suitably. For example, the surface hardening process may be performed on the entire crushing blade.

It is the figure which attached the crusher of one Embodiment of this invention to the arm of the hydraulic shovel. It is a side view of the movable jaw of the crusher (a) is a front view of the movable jaw, and (b) is a plan view of the movable jaw. It is a perspective view of the front-end | tip part of the same movable jaw. It is a side view of the crusher with the movable jaw opened. It is a side view of the crusher with the movable jaw closed. It is sectional drawing of the crushing blade of the crusher.

Explanation of symbols

1 Crusher 2 Frame 3 Movable jaw 4 Cylinder
31 Tip nail
32 Crushing blade
32a, c Concave curve
32b Convex curve
33 Rebar cutting blade
34 Forward protrusion
35 Wedge-shaped part
S1 Reinforced concrete (to be crushed)

Claims (1)

It has a frame attached to the tip of a hydraulic excavator and a pair of movable jaws attached to the frame so as to be opened and closed.
The movable jaw has a tip protruding portion and a crushing blade extending in the length direction, and the crushing blade has a concave curved portion, a convex curved portion, and a concave curved portion that are successively formed from the tip side. A crusher used by attaching to a hydraulic excavator,
The tip protrusion formed on the movable jaw tip is formed with a tip claw protruding toward the other movable jaw in a state where the tip is substantially in contact when both movable jaws are closed,
A crusher in which the front and rear claw is narrower as the tip claw goes to the tip of the claw, and the left and right widths of the upper end portion of the claw at the distal end of the movable jaw are the narrowest.

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