JPH0941678A - Crusher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce damage by eliminating the need for a synchronizing link for synchronizing the rotations of a pair of right and left crushing arms. SOLUTION: In this crusher having a pair of crushing arms 2R, 2L for crushing a subject to be crushed by sandwiching it under pressure, a main frame 1 against which the crushing arms 2R, 2L are rotatably supported, a hydraulic cylinder 7 for operating the crushing arms, and a mounting bracket 6 for mounting the main frame 1 on the boom of a construction vehicle, the rod 7R of the hydraulic cylinder 7 is connected to one crushing arm 2R and the cylinder tube 7T of the hydraulic cylinder 7 to the other crushing arm 2L via respective toggle links to increase crushing forces. The main frame 1 is provided with stoppers 9R, 9L to limit the moving range of the hydraulic cylinder 7 to prevent the cylinder from moving only in one direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crusher which is mounted on a construction vehicle such as a hydraulic power shovel to dismantle, crush, and cut a structure such as reinforced concrete or steel concrete during the dismantling work of the structure.

[0002]

2. Description of the Related Art A crusher for crushing a concrete structure or the like comprises a pair of crushing arms for crushing an object to be crushed, a main frame for rotatably supporting the crushing arms around an arm pin, and a crushing device. It is equipped with a hydraulic cylinder for arm operation and a mounting bracket for a construction vehicle, which is attached to a boom of a construction vehicle, and an operation pipeline is connected from the hydraulic system of the construction vehicle to the hydraulic cylinder for crushing arm operation. It was configured to connect and supply pressure oil, expand and contract the hydraulic cylinder, and rotate the crushing arm to crush and crush the object to be crushed.

The hydraulic cylinder is directly mounted between the rear ends of the pair of crushing arms substantially parallel to the opening / closing direction of the crushing arm tips. In the crushing work using such a crusher, it is often done in a narrow place or a place with poor scaffolding, therefore,
It is desirable that the crushing arm be compact and lightweight, have a strong crushing force, and that the crushing arm move quickly and have good work efficiency.

In the above crusher, in order to increase the crushing force, the output of the hydraulic cylinder is increased (that is, the hydraulic pressure is increased or the piston diameter is increased) and the distance from the arm pin to the hydraulic cylinder is increased. It is conceivable to reduce the distance from the arm pin to the tip point. However, increasing the output of the hydraulic cylinder increases the price and weight. In addition, if the distance from the arm pin to the hydraulic cylinder is increased, the total length of the crusher becomes longer and the opening width of the crushing arm becomes narrower with respect to the expansion / contraction distance of the hydraulic cylinder. Must be large, which results in high cost and weight. Moreover, the time required for the expansion and contraction of the hydraulic cylinder increases, and the work efficiency decreases. If the distance from the arm pin to the tip point is made small, the opening width becomes small and it becomes impossible to crush a large object to be crushed.

Therefore, as shown in FIG. 7, a pair of crushing arms 2L and 2R for pinching and crushing an object to be crushed, a main frame 1 rotatably supporting the crushing arms 2L and 2R, and crushing. In a crusher provided with a hydraulic cylinder 7 for arm operation and a mounting bracket 6 for mounting the main frame 1 on a boom of a construction vehicle, a rod 7R of the hydraulic cylinder 7 is attached to the main frame 1 and one crushing arm 2R, The upper link 4R and the lower link 5R are connected to each other, and the cylinder tube 7T of the hydraulic cylinder 7 is connected to the main frame 1 and the other crushing arm 2L, and the upper link 4L and the lower link 5L.
It has been proposed to increase the crushing force by connecting with.

In this crusher, the upper link 4R and the lower link 5R, and the upper link 4L and the lower link 5L form toggle links, respectively. Therefore, when crushing an object to be crushed by clamping, the output of the hydraulic cylinder 7 is much higher. A great crushing power will be obtained. Therefore, since a small hydraulic cylinder having a small output can be used, the piston diameter can be reduced, the piston stroke can be shortened, and the weight can be reduced. Further, since the hydraulic cylinder 7 does not move much in the vertical direction during expansion and contraction, it is possible to shorten the overall length of the crusher and increase the opening width.

On the other hand, when the upper link 4L and the lower link 5L or the upper link 4R and the lower link 5R are aligned with each other, the force acting on the lower link 5L or the lower link 5R becomes infinite in calculation, and the product of the crusher is produced. Since it is difficult to secure safety in terms of strength, stop the movement of the upper links 4L, 5R and the lower links 5L, 5R before the upper link 4L and the lower link 5L or the upper link 4R and the lower link 5R are aligned. There must be.

For this reason, the pair of crushing arms 2L and 2R are provided with a tuning link 8 which is connected to each other. Since the crushing arms 2L, 2R are connected to each other by the tuning link 8, for example, when only the left crushing arm 2L tries to rotate in the counterclockwise direction, the tuning link 8 causes the tuning link pin of the right crushing arm 2R to rotate. A force that pushes 18R to rotate the crushing arm 2R on the right side in the clockwise direction acts to open and close the left and right evenly.

By providing the tuning link 8, the movement of the upper links 4L, 5R and the lower links 5L, 5R is stopped before the upper link 4L and the lower link 5L or the upper link 4R and the lower link 5R are aligned. Is set so that the upper link 4L and the lower link 5L, and the upper link 4R and the lower link 5R do not reach a straight line when the hydraulic cylinder 7 extends and the crushing arms 2L and 2R close evenly on the left and right. It suffices to do so, and it is possible to avoid a situation in which only one of the crushing arms pivots largely and the upper link 4L and the lower link 5L or the upper link 4R and the lower link 5R are aligned.

[0010]

However, since the tuning link 8 has a complicated mechanism and is provided near the arm pins 3L and 3R supporting the crushing arms 2L and 2R, the crushed object is bitten. However, it may be provided when the crushing arms 2L, 2R are supported by the main frame 1 by independent arm pins 3L, 3R, respectively, but it can be provided, but the crushing arm 2L,
It cannot be provided when 2R is supported by a common arm pin.

The present invention solves such a problem in a crusher. It is compact and lightweight, has a high crushing power even if the output of a hydraulic cylinder is small, has a high work efficiency, and does not require a tuning link. It is an object of the present invention to provide a crusher that can be simplified and has less damage.

[0012]

SUMMARY OF THE INVENTION The present invention is directed to a pair of crushing arms for crushing an object to be crushed, a main frame for rotatably supporting the crushing arms, and a hydraulic cylinder for operating the crushing arms. And a mounting bracket for mounting the main frame to a boom of a construction vehicle, wherein a rod of the hydraulic cylinder is used as one of the crushing arms and the main frame, and a cylinder tube of the hydraulic cylinder is used as the other crushing arm and the main frame. In order to solve the above problem, the main frame is provided with a stopper for restricting the movement range of the hydraulic cylinder, which prevents uneven opening and closing of the crushing arm to increase the crushing force. There is.

[0013]

1 is a front view of a crusher according to an embodiment of the present invention, and FIGS. 2 and 3 are explanatory views of the operation of the crusher. Here, a pair of left and right crushing arms 2L, 2R for pinching and crushing the crushed object are rotatably supported on the main frame 1 by arm pins 3L, 3R. The upper end of the upper link 4R is pivotally attached to the upper right end of the main frame 1 by a link pin 14R, and the lower end of the lower link 5R is pivotally attached to the upper right end of the crushing arm 2R by a link pin 15R. The lower end of the upper link 4R and the upper end of the lower link 5R are connected to the rod 7R of the hydraulic cylinder 7 by a connecting pin 17R to form a toggle link.

The upper end of the upper link 4L is pivotally attached to the upper left end of the main frame 1 by a link pin 14L, and the lower end of the lower link 5L is pivotally attached to the upper left end of the crushing arm 2L by a link pin 15L. The lower end of the upper link 4L and the upper end of the lower link 5L are connected to the cylinder tube 7T of the hydraulic cylinder 7 by a connecting pin 17L to form a toggle link.

Stoppers 9L and 9R are provided on the left and right sides of the main frame 1 to restrict the moving range of the hydraulic cylinder 7 by contacting the bosses 19L and 19R for mounting the connecting pins 17L and 17R when the hydraulic cylinder 7 is extended. ing. The stoppers 9L and 9R can extend the entire stroke of the hydraulic cylinder 7 so that only one of the crushing arms does not greatly rotate, and the stoppers 9L and 9R do not exceed the positions when the crushing arms 2L and 2R are evenly closed to the left and right, That is, it is set at a position where it does not move beyond 1/2 of the total stroke of the hydraulic cylinder 7 in either the left or right direction.

Crushing surface 20L for crushing the crushed object under pressure, 2
Cutters 21 and 22 for cutting rebars, steel frames and the like are provided at the upper end of 0R. At the upper end of the main frame 1, a mounting hole 30 for mounting the crusher on the boom of the construction vehicle
A mounting bracket 6 having is provided. When performing the crushing work, when the operator switches the control valve of the hydraulic system of the construction vehicle from the open state of FIG. 1, pressure oil is supplied to the hydraulic cylinder 7, and the hydraulic cylinder 7 starts extending. The crushing arm 2L rotates counterclockwise about the arm pin 3L and the crushing arm 2R rotates clockwise about the arm pin 3R to rotate the crushing arms 2L and 2R as shown in FIG.
Is closed and the crushed object is crushed by pinching. After crushing, the hydraulic cylinder 7 is shortened and returned to the open state shown in FIG.

Crushing arms 2L, 2R depending on the material to be crushed
If either one of the movements is blocked, the crushing arm 2L,
Opening and closing operations of 2R are uneven on the left and right. With this crusher,
When the hydraulic cylinder 7 extends, for example, even if the movement of the right crushing arm 2R is hindered and only the left crushing arm 2L starts to rotate first, the boss 19L that attaches the connecting pin 17L to the stopper 9L will eventually come out. And the rotation is restricted at the position shown in FIG. 3, and the crushing arm 2R side rotates thereafter, so that the upper link 4L and the lower link 5L are aligned with each other and an excessive force is applied to the crusher. There is no risk of reducing safety in terms of product strength. Right crushing arm 2R
When only the chisel starts to rotate first, the boss 19R for mounting the connecting pin 17R abuts the stopper 9R and the rotation is restricted.

Therefore, it is not necessary to provide a complicated mechanism such as a tuning link, and the crushed object is not caught.

[0019]

EXAMPLE FIG. 4, FIG. 5, and FIG. 6 are front views showing examples of a crusher. In addition to the stoppers 9L and 9R for restricting the moving range when the hydraulic cylinder 7 extends, the crusher of FIG. 4 has a central portion of the main frame 1 and left and right crushing arms 2
Stoppers 10, 11L, 11R for restricting the positions when the hydraulic cylinder 7 is shortened are provided at the upper ends of L, 2R. With these stoppers 10, 11L, 11R,
The crushing arms 2L, 2R are even on the left and right even in the open state.
Other points are the same as the crusher of FIG.

The crusher shown in FIG. 5 uses a clevis type hydraulic cylinder 7. The main frame 1 has a wide width, and the left and right crushing arms 2L, 2R have lower links 5L.
The mounting portion of 5R is formed so as to project to the left and right. Other points are the same as the crusher of FIG. The crusher of Figure 6
A pair of left and right crushing arms 2L, 2R are rotatably supported by a main arm 1 by a common arm pin 3. Other points are the same as the crusher of FIG.

[0021]

As described above, the crusher of the present invention is compact and lightweight, has a large crushing power even if the output of the hydraulic cylinder is small, has a high work efficiency, and does not require a tuning link having a complicated mechanism. The structure is simplified, and it is possible to reduce damage by biting the object to be crushed and without applying excessive force.

[Brief description of drawings]

FIG. 1 is a front view of a crusher showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram of the operation of the crusher.

FIG. 3 is an explanatory diagram of the operation of the crusher.

FIG. 4 is a front view of a crusher showing an embodiment of the present invention.

FIG. 5 is a front view of a crusher showing an embodiment of the present invention.

FIG. 6 is a front view of a crusher showing an embodiment of the present invention.

FIG. 7 is a front view of a conventional crusher.

[Explanation of symbols]

 1 Main Frame 2L, 2R Crushing Arm 3L, 3R Arm Pin 4L, 4R Upper Link 5L, 5R Lower Link 6 Mounting Bracket 7 Hydraulic Cylinder 7R Rod 7T Cylinder Tube 9L, 9R Stopper 14L, 14R Link Pin 15L, 15R Link Pin 17L, 17R Connecting Pin 19L, 19R Boss

Claims (1)

[Claims] 1. A pair of crushing arms for pinching and crushing an object to be crushed, a main frame for rotatably supporting the crushing arms, a hydraulic cylinder for operating the crushing arms, and the main frame for a construction vehicle. A crusher equipped with a mounting bracket to be mounted on the boom of, wherein the rod of the hydraulic cylinder is used for one crushing arm and the main frame, and the cylinder tube of the hydraulic cylinder is used for the other crushing arm and the main frame, respectively. A crusher characterized in that the main frame is provided with a stopper for restricting a movement range of the hydraulic cylinder, the crusher being connected through a link.