JPH0971964A - Impact crusher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce reaction applied to the supporting point of an impact crusher for a hydraulic shovel attachment. SOLUTION: A percussion member 20 is installed near the front end of a bucket 10 rotatably mounted at the front end of an arm 5 for a hydraulic shovel by a pin 11. Each section is determined so as to approximately satisfy the relationship of mab=I when a distance between the center of gravity G of the bucket 10 and the point of percussion B of the percussion member 20 is represented by (a), a distance between the center of gravity G and the center A of the pin 11 by (b), the mass of the bucket 10 by (m) and the moment of intertia in the periphery of the center of gravity of the bucket 10 by I. Accordingly, reaction D applied to the pin 11 at a time when impact force C is applied to the point of percussion reaches approximately 0.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact crushing device, and more particularly to an impact crushing device for an attachment attached to a hydraulic excavator or the like.

[0002]

2. Description of the Related Art Conventionally, an impact crushing device has been used in hydraulic excavators as an attachment for applying vibration to the blade edge of a bucket and crushing large rocks by the impact. FIG. 4 is a side view of the hydraulic excavator during the impact crushing work. An upper revolving structure 2 having a work machine 3 is mounted on the lower traveling structure 1. The boom 4 of the work machine 3 is mounted on the upper revolving structure 2 so as to be up and down freely, and an arm 5 is rotatably mounted on the tip of the boom 4 by a pin 6. The boom 4 and the arm 5 are connected by the arm cylinder 7, and when the arm cylinder 7 is expanded and contracted, the arm 5 rotates about the pin 6. A bucket 10 is rotatably attached to the tip of the arm 5 by a pin 11, and the arm 5 and the bucket 10 are connected by a bucket cylinder 14 via links 12 and 13. When the bucket cylinder 14 is expanded and contracted, the bucket 10 rotates about the pin 11. When crushing a large rock 16, the blade edge 15 of the bucket 10 is brought into contact with the rock 16, the bucket 10 is rotated so as to vibrate about the pin 11, and an impact force is generated at the blade edge 15 to remove the rock 16. Crush.

FIG. 5 is a side view of a working machine 3 in which a first example of a vibration generating device for generating an impact force on the cutting edge 15 is mounted, and between the bucket cylinder 14 and the links 12 and 13. An impact cylinder 18 is attached via a link 17. When vibration is generated in the impact cylinder 17 in the direction of arrow x, the blade edge 15 of the bucket 10 vibrates in the direction of arrow y, and an impact force is generated at the blade edge 15 in contact with the crushed object.

FIG. 6 is a side view of a second example of the impact crushing device. Vibration of the bucket cylinder 14 in the direction of arrow x is generated, and impact force in the direction of arrow y is applied to the blade edge 15 of the bucket 10 as in the first example. Is generated.

[0005]

However, the above structure has the following problems. Figure 7 shows bucket 1
It is a detailed view of 0, and when the impact force P is generated on the cutting edge 15 as described above, the force Q is applied to the pin 11 as a reaction force.
This force Q is a dynamic force and becomes a vibration and affects the operator and the vehicle body. That is, (1) the operator is easily tired. (2) It causes the life of the vehicle body and the working machine to be shortened. (3) Loose bolts are apt to occur in each part. Problems such as occur.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an impact crushing device which reduces the influence on the operator and the vehicle when the impact crushing work is performed.

[0007]

In order to achieve the above object, in the impact crushing device according to the present invention, the impact crushing device rotates about a rotation center stopped at a predetermined position as a fulcrum, and a predetermined distance from the fulcrum. In an impact crushing device for hitting and crushing an object to be crushed at striking points provided at separate positions, the relationship between the center of gravity (b) of the crushing device and the striking point position (a + b) with respect to the center of rotation is described. , Mab = I where m is the mass of the crushing device, a is the distance between the center of gravity of the crushing device and the impact point, b is the distance between the center of gravity of the crushing device and the center of rotation,
I is a configuration in which the inertia moment of the crushing device centering on the center of gravity is set.

[0008]

With the above structure, when an impact force is generated at the striking point, almost no dynamic reaction force is applied to the fulcrum which is the center of rotation.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an impact crushing device according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side view of a backhoe type bucket 10 showing a first embodiment of an impact crushing device, and a vibration generator for generating an impact force is the same as the conventional one shown in FIGS. 5 and 6. Therefore, the explanation is omitted. The bucket 10 is rotatably attached to the arm 5 by a pin 11. A striking member 20 is provided in the vicinity of the tip of the bucket 10 in addition to the cutting edge 15, and the distance from the striking point B to the gravity center position G of the bucket 10 which is the crushing device is a,
The pin 11 that is the center of rotation from the center of gravity G of the bucket 10
Where b is the distance to the center A of the bucket, m is the mass of the bucket 10 and I is the moment of inertia of the bucket 10 with the center of gravity G as the center, the position of the impact point B satisfies the relationship of mab = I. It is set to the position to do.

The relationship between the impact force C applied to the crushed object at the impact point B and the reaction force D applied to the center A of the pin 6 when the bucket 10 is rotated around the center A of the pin 11 as the rotation center. Is the same as when the ball is hit with the bat. Based on the theory of the rotation mechanism of the bat, the distance from the center of gravity of the bat to the impact point is a, the distance from the center of gravity of the bat to the gripping point is b, the mass of the bat is m, the moment of inertia about the center of gravity G of the bat. Is expressed as I, and when the relationship of mab = I is satisfied, the reaction force at the gripping point of the bat when the ball is hit at the hitting point of the bat becomes 0. Therefore, when hitting at the hitting point B of the bucket 10, the center A of the pin 11 corresponding to the position where the bat is grasped
The reaction force D applied to is 0. Even if the above equation is not completely satisfied, the reaction force D can be significantly reduced as compared with the conventional one by substantially satisfying the above equation.

FIG. 2 is a side view of a face shovel type bucket 10 showing a second embodiment of the impact crushing device.
In this case, a striking member 21 is provided on the bottom plate 19 of the bucket 10. The distance a between the center of gravity G of the bucket 10 and the striking point E of the striking member 21, the distance b between the center of gravity G of the bucket 10 and the center A of the pin 11, the mass m of the bucket 10, and the center of gravity of the bucket 10 Similar to the first embodiment, the relation between the moment of inertia I and the moment of inertia I satisfies the relation of mab = I. Since the operation is the same as that of the first embodiment, its explanation is omitted.

FIG. 3 is a diagram showing a third embodiment of the impact crushing apparatus, which is an example in which the arm 5 of the working machine 3 is provided with a striking member. That is, the bucket 10, the link 12 shown in FIG.
13, the bucket cylinder 14 is removed, and the striking member 22 is provided on the arm 5. When the arm cylinder 7 is vibrated in the expansion / contraction direction, the arm 5 rotates about the pin 6,
The striking member 22 strikes the crushed object. Arm 5
The distance a between the center of gravity G and the striking point F of the striking member 22,
The distance b between the center of gravity G of the arm 5 and the center H of the pin 6,
Similar to the first embodiment, the relationship between the mass m of the arm 5 and the moment of inertia I about the center of gravity of the arm 5 is selected so that the hitting point H is located so as to satisfy the relationship of mab = I. . The operation is similar to that of the first embodiment.

In the above-described embodiment, the distance a between the center of gravity of the crushing device and the striking point or the distance b between the center of gravity and the center of rotation is adjusted to satisfy mab = I. May be adjusted to satisfy mab = I.

[0015]

Since the present invention is configured as described above in detail, when the object to be crushed is hit at the hitting point of the hitting member, the reaction force applied to the fulcrum becomes extremely small, and the operator is fatigued during hitting work. It is possible to obtain an impact crushing device that does not cause damage, shorten the life of the main body and the working machine, or loosen the bolt.

[Brief description of drawings]

FIG. 1 is a side view of a bucket portion of a crushing device according to a first embodiment of the present invention.

FIG. 2 is a side view of the bucket portion of the second embodiment.

FIG. 3 is a side view of an arm portion of the third embodiment.

FIG. 4 is a side view of the hydraulic excavator during impact crushing work.

FIG. 5 is a drawing of a first example of an impact device.

FIG. 6 is a drawing of a second example of an impact device.

FIG. 7 is a side view of a bucket portion of a conventional crushing device.

[Explanation of symbols]

 5 arm 6, 11 pin 10 bucket 20, 21, 22 striking member

Claims (1)

[Claims] 1. An impact crushing device which rotates about a rotation center stopped at a predetermined position as a fulcrum, hits an object to be crushed at an impact point provided at a position separated from the fulcrum by a predetermined distance, and crushes the crushed object. In, the relation between the position (b) of the center of gravity of the crushing device with respect to the center of rotation and the position (a + b) of the hitting point is approximately mab = I where m is the mass of the crushing device and a is the center of gravity of the crushing device and the impact An impact crushing device characterized in that the distance from a point, b is the distance between the center of gravity of the crushing device and the center of rotation, and I is the moment of inertia of the crushing device centering on the center of gravity.