JP2003211009A - Crusher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crusher which easily crushes a concrete structure and has a prolonged life time of a crushing member. <P>SOLUTION: This concrete crusher comprises: a pair of crushing members 1 and 1 which are provided with crushing blades 5 and 5 on inner surfaces opposed to each other; a frame 3 to support the crushing members 1 and 1 so that they are opened, closed and turned; and a hydraulic cylinder 4 to open, close and turn the crushing members 1 and 1. As for the side shape or the cross section shape of the crushing blade 5, blade surfaces 5b and 5b are each formed in the shape of a convex surface from the shape of a concave curve to form an arrowhead shape so that compressive force is intense in an early stage of crushing and wedge force excels gradually in order to improve crushing efficiency to a material to be crushed W. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work machine such as a power shovel, which is attached as an attachment to a tip of a drive arm thereof. The present invention relates to a crusher used for crushing a structure. 2. Description of the Related Art At the demolition site of a building, as an attachment attached to the tip of a drive arm of a working machine such as a power shovel, for example, as shown in FIG. There is a crusher B.
This crusher B is a concrete structure W to be crushed.
And a pair of crushing members 11, 11 formed in a symmetrical shape for pinching and crushing the
Frame 13 that is supported so as to be openable and closable about center 12
And a hydraulic cylinder 14 for opening and closing the crushing members 11, 11. The concrete structure W is opened and closed and rotated by operating the hydraulic cylinder 14 to expand and contract, thereby turning the concrete structure W into the crushing members 11, 11. Sandwiched by 11,
Concrete structure W by the force of hydraulic cylinder 14
Are crushed and crushed. [0003] The crushing members 11 of the crusher B are provided with crushing blades 15, 15 at the front end and the middle of the opposing inner surfaces on the front end side. This crushing blade 15
As shown in FIGS. 4 and 5, the concrete structure W has a cutting edge 15 a which is sharply sharpened so as to be able to bite into the concrete structure W. The cutting surfaces 15 b, 15 b are formed on both sides of the cutting edge 15 a in a concave curved surface shape. Therefore, the concrete structure W sandwiched between the pair of crushing members 11, 11 is
When pressure is applied by the crushing blade 4, a intensive load is applied by the cutting edges 15a, 15a of the crushing blades 15, 15, and the crushing blade 1
The cutting edges 5a and 15a of 5 and 15 bite into each other, and cracks and cracks are gradually generated. When a load is further applied by the hydraulic cylinder 14, they are finally crushed. [0004] In the conventional crusher B,
Since the blade surfaces 15b, 15b of the crushing blade 15 are formed into a concave curved surface, the wedge force and the wedge force horizontal component force decrease as the crushing blade 15 bites into the concrete structure W, and the stress applied to the concrete structure W Has excellent compressive force. Since concrete has a property of being strong against compressive stress and weak against tensile stress, it is necessary to apply a large load for a long time in order to cause the concrete structure W to be crushed, and there has been a problem that the working efficiency is poor. Therefore, it is necessary to increase the size of the hydraulic cylinder 14 in order to increase the working efficiency, and there is a problem that the size of the crusher increases and the cost increases. Further, since the blade surfaces 15b, 15b of the crushing blade 15 are formed in a concave curved surface, the blade edge 15a of the crushing blade 15 is easily worn for the above-mentioned reason, and the crushing members 11, 11 are quickly removed. There was also a problem that needed to be changed. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a crusher which can easily crush concrete structures and can extend the service life of the crushing member. . [0007] In order to achieve the above object, the present invention provides a pair of crushing members provided with crushing blades on inner surfaces facing each other, and a pair of crushing members which can be opened and closed to rotate. In a crusher having a supporting frame and a hydraulic cylinder for opening and closing the pair of crushing members, the side shape or the cross-sectional shape of the crushing blade is such that the compressive force is strong at the initial stage of crushing, and the wedge force gradually becomes superior. The blade surface is formed in a convex curved shape so as to be a crushing blade, and furthermore, is formed in an arrowhead shape that generates a crack in an advantageous direction so as to improve crushing efficiency. An embodiment of the crusher according to the present invention will be described below with reference to the drawings. As shown in FIG. 1, a crushing machine A according to the present invention comprises a pair of crushing members 1, 1 formed in a symmetrical shape for crushing and crushing a concrete structure W; The apparatus includes a frame 3 for supporting the opening and closing pivot about the shafts 2 and 2, and a hydraulic cylinder 4 for opening and closing the crushing members 1 and 1. The crushing members 1 and 1 are provided with crushing blades 5 and 5 at the front end portion and the intermediate portion of the opposing inner surfaces on the front end side. As shown in FIGS. 1 and 2, the crushing blade 5 has a cutting edge 5a that is sharpened so as to bite into the concrete structure W, and cutting surfaces 5b, 5b are provided on both sides of the cutting edge 5a.
Are formed in a convex curved shape. That is, the crushing blade 5 is formed such that the side surface shape is an arrowhead shape. A case where the concrete structure W is crushed by the crusher A having the above structure will be described. The concrete structure W is sandwiched between the crushing members 1 and 1 by opening and closing the crushing members 1 and 1 by expanding and contracting the hydraulic cylinder 4 and further applying a load by the hydraulic cylinder 4 in this state. Concentrated load is applied to W by the crushing blades 5, 5 of the crushing members 1, 1,
The edge 5a of the crushing blades 5,5 on the concrete structure W
And the concrete structure W is cracked or cracked. When a load is further applied by the hydraulic cylinder 4, the concrete structure W having cracks or cracks is crushed by the crushing blades 5, 5 of the crushing members 1, 1. According to the crushing machine A according to the present invention, the crushing blade 5 provided on the crushing member 1 has the blade surfaces 5b, 5b formed in a convex curved shape, so that the crushing blade 5 bites into the concrete structure W. When the edge angles of the convexly curved blade surfaces 5b, 5b become acute, the wedge force and the horizontal component force of the wedge force are increased, and the force for tearing right and left is increased. Accordingly, the concrete structure W has an excellent tensile stress, and the concrete structure W that is extremely weak against the tensile stress is easily crushed, and the concrete structure W can be crushed with a smaller load. Further, since the blade surfaces 5b, 5b of the crushing blade 5 are formed in a convex curved shape, the cutting edge 5a of the crushing blade 5 is hardly worn, and the crushing blade 5 can be used for a long time and the crushing member 1 can be used. The service life can be extended. Although a specific embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be implemented with various modifications. For example, in the above embodiment, the side shape of the crushing blade 5 is formed so as to have an arrowhead shape. However, for example, like the crushing blade 6 shown in FIG. The triangular blade surfaces 6b, 6b,... Viewed from a plane are formed on the front and rear and left and right sides of the sharpened blade edge 6a so that the crushing efficiency works advantageously in the direction of the crack due to the crushing. May be formed. By doing so, it is possible to easily cause the direction of the crack due to the crushing of the concrete structure W not only in the horizontal direction but also in the vertical direction with respect to the axial direction of the crushing member 1. In the above-described embodiment, the cutting edge 5a of the crushing blade 5 is sharpened as shown in the figure, but the cutting edge 5a of the crushing blade 5 can be cut into the concrete structure W if it can bite into the concrete structure W.
It is not necessary to sharpen a at an acute angle. As described above, according to the present invention, the crushing blade has a lateral shape or a cross-sectional shape which is changed from a concave surface to a compressive force which is predominant in the initial stage of crushing. Because it was formed into a convex curved surface (arrowhead shape) with excellent power,
As the crushing blade cuts into the material to be crushed, the tensile stress becomes more
A concrete structure that is strong against compressive stress and weak against tensile stress is easily crushed, and the concrete structure can be efficiently destroyed with a smaller load than before. As a result, work time can be significantly reduced,
It is possible to exhibit an extremely excellent effect that it is possible to suppress the increase in the size and cost of the crusher. Further, by forming the blade surface of the crushing blade into a convex curved surface, the blade edge of the crushing blade is hardly worn, and the service life of the crushing member can be prolonged. it can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing an embodiment of a crusher of the present invention. FIG. 2 is a perspective view of a crushing blade in the crushing machine of the present invention. 3A and 3B show another embodiment of a crushing blade, wherein FIG. 3A is a perspective view and FIG. 3B is a plan view. FIG. 4 is a side view of a conventional crusher. FIG. 5 is a perspective view of a crushing blade in a conventional crusher. [Description of Signs] 1 Crushing member 2 Shaft 3 Frame 4 Hydraulic cylinder 5 Crushing blade 5a Blade tip 5b Blade surface

Claims (1)

1. A pair of crushing members provided with crushing blades on inner surfaces facing each other, a frame for supporting the pair of crushing members so as to be able to open and close, and opening and closing the pair of crushing members. A crushing machine having a hydraulic cylinder to be rotated, wherein a side surface or a cross-sectional shape of the crushing blade is formed by changing a blade surface from a concave curved surface to a convex curved surface in order to improve a crushing effect on an object to be crushed. A crusher formed in a shape.