JPH07166521A - Road surface cutting device - Google Patents

Abstract

PURPOSE:To provide a road surface cutting device capable of reducing the rotation angle of a rotary shutter and capable of minimizing the restriction of the visual field at the oblique front of a vehicle due to the sprung-up rotary shutter. CONSTITUTION:This road surface cutting device is provided with a frame 7 protruded at the front in the traveling direction of a work vehicle, a rotary cutter 9 rotatably supported on a cutter support section 8 provided on the tip side in the protruding direction of the frame 7, and a blade 10 arranged behind the cutter support section 8. An accumulated object in front of the blade 10 is discharged from a discharge port 11 provided on the side of the blade 10. A rotary shutter 12 opening or closing the discharge port 11 is rotatably fitted to the cutter support section 8 of the frame 7 in this road surface cutting device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road surface cutting device for cutting a frozen road surface or the like into a desired shape, and more particularly to a road surface cutting device used by being attached to a work vehicle such as a wheel loader in an attachment manner.

[0002]

2. Description of the Related Art As a road surface cutting device which is used by being attached to a work vehicle such as a wheel loader in an attachment type, there is a road surface cutting device disclosed in JP-A-4-350206. This road surface cutting device is equipped with a rotary cutting body at the front end of a frame protruding from the front of the wheel-type traveling body in the traveling direction, and a blade is placed behind this rotary cutting body to rotate in the traveling state. The cutting body is rotated to cut a frozen road surface into a rough surface, and the cut road surface is shaped by a subsequent blade.

In this road surface cutting device, ice shavings, fresh snow, etc. are guided by the blades and removed to the roadside from the discharge port on the side of the blades, but they are not excluded at the entrances of private houses. It is necessary to provide a shutter that opens and closes one side of the blade. This is also necessary for snow plows, and as a result,
As disclosed in Japanese Unexamined Patent Publication No. 8-51217, a plate-shaped rotary shutter is provided on one side of the blade so as to be openable and closable.

[0004]

In the snow plow described above, since there is no structure in front of the snow removing blade, the rotary support shaft s1 of the shutter S is fixed as shown in FIGS. 4 (a) and 4 (b). Behind the blade B behind the vehicle (right side of the figure)
Alternatively, it can be set only directly above the blade B. Therefore, the shutter S is supported in a cantilever state in which the front end side in the traveling direction is a free end. During the snow removal work, a large force F is applied to the tip of the shutter S due to the scraping of compressed snow, etc. Therefore, if the rigidity of the shutter S is not sufficient, the force F may cause the shutter S to buckle and deform. Here, in the road surface cutting device as described above, both the rotary cutting body and the blade are used to consolidate ice shavings, fresh snow, etc., and remove them to the road side. The area is large and the degree of consolidation is stronger than snow plows. Therefore, if the above-mentioned snow plow shutter mounting structure is used as it is for a road surface cutting device, the shutter becomes considerably large and heavy, together with the demand for buckling prevention,
The force required for the rotating operation becomes much larger.

In the shutter of Japanese Utility Model Publication No. 58-51217, the support shaft s1 is set behind the lower end of the blade B as shown in FIG. 4 (a), or as shown in FIG. 4 (b). Since it is set right above the blade B, it is not possible to achieve both reduction of the rotation angle of the shutter and securing of the field of view.
That is, as shown in FIG. 4A, when the support shaft s1 is behind the lower end of the blade B1, the rotation angle θ of the shutter S is increased.
If 90 ° is not secured at least, the region A immediately before the lower end of the blade B1 will not open and the snow accumulated on the front surface of the blade B cannot be discharged. On the other hand, when the support shaft s1 is set right above the blade B as shown in FIG.
Area A can be opened with a smaller rotation angle than
As the distance from the support shaft s1 increases and the displacement with respect to the rotation angle of the shutter S increases with increasing distance from the blade B to the front (the left side in the drawing) of the vehicle in the traveling direction of the vehicle, when the shutter S is flipped up, the shutter S The front edge portion of the blade B protrudes diagonally to the upper front of the blade B, and deteriorates the field of view of the vehicle diagonally front. In the road surface cutting device, since the rotary cutting body is arranged in front of the blade B, it is of utmost importance to secure the field of view in front of the blade B. The mounting structure of FIG. I can't answer.

It is an object of the present invention to provide a road surface cutting device which can easily secure the strength of a rotary shutter and can achieve both reduction of a rotation angle and securing of a field of view diagonally forward of a vehicle.

[0007]

The present invention will be described with reference to FIGS. 1 to 3 showing an embodiment of the present invention. In the present invention, a frame 7 protruding from the front surface in the traveling direction of a work vehicle and a protrusion of the frame 7 are provided. A rotary cutting body 9 rotatably supported by a cutting body supporting portion 8 provided on the tip end side in the direction, and a blade 10 arranged rearward of the cutting body supporting portion 8, and an aggregate on the front surface of the blade 10. Outlet 11 with the blade set to the side of the blade 10
It is applied to the road surface cutting device that discharges from. Then, the rotary shutter 12 for opening and closing the discharge port 11 is rotatably attached to the cutting body support portion 8 of the frame 7 to achieve the above-described object. In the invention of claim 2, the frame 7 is provided with the discharge port 1
A shutter holding unit 20 that holds the rear edge of the rotary shutter 12 that closes the shutter 1 is provided.

[0008]

Since the rotary shutter 12 is supported in front of the blade 10, the rotary shutter 12 is pulled by the force F applied to the front edge of the rotary shutter 12, and there is no risk of buckling deformation. The trailing edge portion 19 of the rotary shutter 12 located on the blade 10 side is largely rotationally displaced according to the radius of rotation of the rotary shutter 12 even at a small rotation angle, whereby the discharge port 11 can be opened with a small rotation angle. . Further, since the front edge side of the rotary shutter 12 serves as the pivot point, the front edge side of the rotary shutter 12 does not largely project above the vehicle. According to the second aspect of the invention, when the discharge port 11 is closed, the rear edge portion 19 of the rotary shutter 12 is held by the shutter holding portion 20, so the rotary shutter 12 has a double-sided support structure and a sufficient support. Strength is obtained.

Incidentally, in the section of means and action for solving the above-mentioned problems for explaining the constitution of the present invention, the drawings of the embodiments are used to make the present invention easy to understand. It is not limited to.

[0010]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 3 shows a road surface cutting apparatus according to the present invention mounted on a wheel loader. The wheel loader 1 has a traveling body 3 having traveling wheels 2 at the front and rear, and an elevating arm 4 that is vertically moved up and down by an elevating cylinder (not shown), and a road surface cutting device 5 is attached to and detached from the front surface of the elevating arm 4. It is installed as possible.

The road surface cutting device 5 has a frame 7 suspended and supported by a turnbuckle type suspension 6 suspended from an elevating arm 4. As shown in more detail in FIG. 1, a pair of arm-shaped cutting body support portions 8 are formed at the front end of the frame 7 in the protruding direction in the left-right direction of the vehicle. A screw type rotary cutting body 9 is attached to the cutting body supporting portion 8 so as to be rotatable around a horizontal axis, and the rotary cutting body 9 is rotationally driven counterclockwise in the figure by a hydraulic motor (not shown). It

As best shown in FIGS. 1 and 2, a plate 10 having a concave front surface is tilted forward and backward with respect to the traveling direction of the vehicle behind the cutting body support portion 8 of the frame 7. It is installed. The inclination of this blade 10 is
The road side of the vehicle, that is, the side shown in FIG. 3 is set to be retracted to the rear of the vehicle, and the rear end position of the blade 10 in the inclination direction is an outlet 11 for ice shavings, fresh snow, and the like.

A support shaft 13 for rotatably supporting the rotary shutter 12 is provided on the cutting body support portion 8 of the frame 7. The rotary shutter 12 has a position where the discharge port 11 is closed as shown by a solid line in FIG. 1 and a support shaft 13 as shown by a virtual line in FIG. Is provided so as to be pivotable between the position where it is flipped up around and the position where the discharge port 11 is opened. A hydraulic cylinder 15 is attached to the frame 7 by a bracket 14. The piston rod 16 of the hydraulic cylinder 15 is pivotally connected to the arm portion 18 of the rotary shutter 12 by a pin 17, and the rotary shutter 12 is rotationally driven by the expansion and contraction of the piston rod 16. The maximum rotation angle of the rotary shutter 12 is determined by the stroke of the hydraulic cylinder 15, and it is not necessary to provide a special stopper to stop the rotary shutter 12 at a fixed position. A gate-shaped shutter holding member 20 that receives and holds the rear edge portion 19 of the rotary shutter 12 that is driven to close the discharge port 11 is fixed to the frame 7.

As described above, since the rotation center of the rotary shutter 12 is located in front of the blade 10, the blade 10
The rear edge portion 19 of the rotary shutter 12 located on the side is largely rotationally displaced according to the radius of rotation of the rotary shutter 12 even at a small rotation angle. As a result, the rotary shutter 12 can open and close the discharge port 11 with a small rotation angle (about 45 degrees in the illustrated example). There is no possibility that the front edge side of the rotary shutter 12 largely projects above the frame 7 and hinders the lateral view of the rotary cutting body 9. Since the rotary shutter 12 is pulled by the force F applied to the rotary shutter 12, there is no risk of buckling. Since the rear edge portion 19 of the rotary shutter 12 with the discharge port 11 closed is held by the shutter holding portion 20, the rotary shutter 12 is supported on both sides by the support shaft 13 and the shutter holding portion 20, and sufficient supporting strength is obtained. can get. As a result, even if a large pressure acts on the rotary shutter 12 due to ice shavings or the like, the rotary shutter 12 opposes with a sufficient supporting strength, and the rotary shutter 12 itself does not need to be reinforced so much. It is possible to reduce the weight of the rotary shutter 12, reduce the diameter of the hydraulic cylinder 15, and reduce the working pressure.

[0015]

As can be understood from the above description, according to the road surface cutting device of the present invention, since the center of rotation of the rotary shutter is located in front of the blade, there is no risk of buckling deformation of the rotary shutter. As a result, the strength of the rotary shutter can be easily secured, the rotation angle of the rotary shutter can be small, and the field of view diagonally forward of the vehicle can be secured. According to the second aspect of the invention, the rotary shutter is supported by both ends, and the required strength is secured even if the strength of the rotary shutter itself is not increased.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a road surface cutting device according to the present invention.

FIG. 2 is a view from the direction of the arrow II in FIG.

FIG. 3 is a side view showing a state in which the road surface cutting device according to the present invention is mounted on a wheel loader.

FIG. 4 is a diagram for explaining a conventional problem.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wheel loader 3 Traveling body 4 Lifting arm 5 Road surface cutting device 7 Frame 9 Rotary cutting body 10 Plate 11 Discharge port 12 Rotary shutter 13 Support shaft 15 Hydraulic cylinder 20 Shutter holding member

Claims (2)

[Claims] 1. A frame protruding from a front surface of a work vehicle in a traveling direction, a rotary cutting body rotatably supported by a cutting body supporting portion provided on a tip end side of the frame in a projecting direction, and the cutting body support. In a road surface cutting device comprising a blade arranged rearward of a portion, and discharging the accumulated material on the front surface of the blade from a discharge port set to the side of the blade, in the cutting body support portion of the frame, A road surface cutting device characterized in that a rotary shutter for opening and closing an outlet is rotatably attached. 2. The road surface cutting device according to claim 1, wherein the frame is provided with a shutter holding portion that holds a rear edge portion of the rotary shutter that closes the discharge port.