JP2544727Y2 - Impact ripper shank stopper device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact ripper device mounted on the rear of a construction machine.

[0002]

2. Description of the Related Art Conventionally, rock excavation with a construction machine such as a bulldozer is performed by a ripper device mounted on the rear side of a vehicle body as shown in FIG. Explaining the structure, a beam 40 is held by a tilt cylinder 31 fixed to a bracket 30 fixed to the rear of the vehicle body and a link 32 to form a four-bar link. The bracket 30 and the beam 40 are connected by a lift cylinder 33. The hydraulic breaker 20 is attached to the beam 40, and a shank 41 is swingably attached to the tip thereof. In the work, the lift cylinder 33 is operated to push the shank 41 into the ground with a pressing force utilizing the weight of the bulldozer body, and the rock is crushed using the traction force of the bulldozer and the oil pressure of the tilt cylinder 31. Therefore, the crushing capacity of bulldozers is almost proportional to the weight of the vehicle, and the hardness of the rocks at the work site is investigated in advance, and vehicles are selected according to the working conditions. When it appears, the rear end of the shank 41 is hit by the hydraulic breaker 20, and a crack is given to the hard rock by the hitting force to facilitate the ripper work.

[0002]

FIG. 6 is a structural view of a ripper device, and FIG. 7 is a sectional view taken along line DD of FIG. One ends of links 42 a and 42 b are axially attached to the beam 40 by pins 43. A rubber bush 44 is fitted between the pin 43 and the links 42a and 42b. Link 42
A shank 41 is pivotally attached to the other end of each of a and 42b by a pin 45 to form a four-bar link. A hydraulic breaker 20 that applies a striking force to the shank 41 is attached to the beam 40. The beam 40 is provided with stoppers 51 and 52 for limiting the swing amount of the shank 41, and a stopper 50 and a link 4 provided on the shank 41, respectively.
2b.

FIG. 8 is a diagram showing a state during a ripper operation. When a force F is applied to the tip of the shank 41, the stopper portion 50 of the shank 41 comes into contact with the stopper 51 of the beam 40, and the force X is applied to the link 42a. , A force Y is applied to the link 42b. As a result, the rubber bush 44 is deformed, the shank 41 moves as indicated by a dashed line, and the stopper 50
Occurs. The force F is a large value and constantly fluctuates at a high speed. Therefore, the contact pressure P of the stopper 50 is large,
Since the moving speed of d is also high, there is a problem that the PV value becomes excessive, and the stopper portion 50 and the stopper 51 are quickly worn.

The present invention has been made in view of the above-mentioned problems, and has as its object to provide a shank stopper device for an impact ripper in which a stopper portion is less worn.

[0005]

In order to achieve the above object,
In the shank stopper device of the impact ripper according to the present invention, the beam mounted on the rear of the vehicle body of the construction machine by a hydraulic cylinder and a link so as to be able to ascend and descend is connected to the connecting pin via a four-joint link through which a bush made of an elastic body is interposed. In a shock ripper device for attaching a shank to the bracket and attaching a hydraulic breaker for giving an impact to the shank, a stopper for limiting the shaking of the shank is provided with a stopper for restricting the shaking of the shank caused by deformation of a bush of the elastic body. It is characterized in that it is arranged in the vicinity where the amount of movement in the direction perpendicular to the movement direction becomes zero.

[0006]

According to the above construction, since the shank stopper is disposed near the position where the movement amount in the direction perpendicular to the shaking direction of the shank becomes zero, the relative movement amount between the shank and the stopper during the ripper operation. Is small, the PV value is reduced, and the wear is reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a shank stopper device for an impact ripper according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a shank portion of the present invention. One end of a link 3a, 3b is axially attached to a beam 1 by a pin 4. FIG. 2 and 3 are AA and BB of FIG. 1, respectively.
FIG. 3 is a cross-sectional view, in which a rubber bush 6 is fitted between the pin 4 and a boss 7 of the beam 1. The other end of each of the links 3a and 3b has a shank 2 pivotally mounted by pins 5a and 5b, respectively, to form a four-bar link. A hydraulic breaker 20 is attached to the rear end of the shank 2. When performing the ripper work, the link 3a is generated by the force F applied to the tip of the shank 2.
, A force in the X direction acts on the link 3b, and a force in the Y direction acts on the link 3b. As a result, the rubber bush 6 is deformed and the pin 5a becomes a
, The pin 5b moves in the Y direction by b, and the shank 2 moves as indicated by a dashed line. as a result,
The shank 2 swings with the point P as a fulcrum. At the point P, there is a slight rotation but no movement.

In the present invention, the stopper pin 12 is disposed near the point P. FIG. 4 is a cross-sectional view taken along line CC of FIG. 1. A boss 10 is provided on the beam 1 near point P, and a stopper pin 12 is fitted through a bush 11. Shank 2
Is engaged with the stopper pin 12, and
When a force is applied to the tip of the shank, the shank 2 comes into contact with the tip to limit the swing of the shank 2. Accordingly, the contact portion between the stopper pin 12 and the shank 2 performs a small relative rotational movement, but the relative movement amount is extremely small. That is, V becomes small, the PV value becomes small, and wear decreases.

[0008]

[Effect of the Invention] As described above, in the present invention, the stopper pin of the shank is arranged at a position where the relative movement between the shank and the stopper pin is small during the ripper operation, so that the PV value of the abutting portion is reduced, resulting in wear. And a shank stopper device for an impact ripper with a reduced life.

[Brief description of the drawings]

FIG. 1 is a side view of the shank stopper device of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view taken along the line CC of FIG. 1;

FIG. 5 is a side view of the bulldozer to which the ripper device is attached.

FIG. 6 is a side view of a conventional ripper device.

FIG. 7 is a sectional view taken along line DD of FIG. 6;

FIG. 8 is a state diagram of a conventional shank during operation.

[Explanation of symbols]

 1 Beam 2 Shank 3a, 3b Link 4, 5a, 5b Pin 6 Rubber Bush 12 Stopper Pin 13 Slot

Claims (1)

(57) [Scope of request for utility model registration] 1. A shank is mounted on a beam mounted on a rear portion of a vehicle body of a construction machine by a hydraulic cylinder and a link so as to be able to move up and down via a four-bar link in which a bush made of an elastic body is interposed on a connecting pin. In a shock ripper device for attaching a hydraulic breaker for giving an impact to the bracket, a stopper for limiting the swing of the shank is provided,
A shank stopper device for an impact ripper, wherein the shank stopper device is provided near a position where a movement amount in a direction perpendicular to a shank swing direction generated by deformation of the elastic bush is zero.