JPH08246494A - Bulldozing apparatus for hydraulic power shovel - Google Patents

Abstract

PURPOSE: To improve the visibility of an operator by adjusting each turning-up cylinder at the shortest position during no use of a blade, and to protect a roadsurface by placing a roadsurface-protective member on the ground by turning-up of the blade during the use of the blade as an outrigger. CONSTITUTION: During bulldozing work, each piston rod 13 for cylinders 12 is most extended, each pin 14 is inserted into a hole on the head of the cylinder 12 and into a hole on the piston rod 13, and blade 9 is set in its standing state, following which the bulldozing work is carried out. When the bulldozing work is not carried out, each of the piston rods 13 for the cylinders 12 is most retracted and is fastened with the pin, and the blade 9 is turned up, and thus the visibility of an operator is improved and operational safety is ensured. When a bulldozing apparatus 30 is used as an outrigger, a roadsurface-protective member 4 at the front part on the undersurface of each blade arm 3 is placed on the ground by turning-up of the blade 9 and a roadsurface is protected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator plate device for a hydraulic excavator, and more particularly to an excavator plate device mounted on a lower traveling body of a hydraulic excavator so as to be elevated.

[0002]

2. Description of the Related Art In a conventional soil excavator plate device for a hydraulic excavator, for example, as disclosed in Japanese Utility Model Laid-Open No. 60-104464, the arm of the soil plate and the soil plate are rotatable by pins. There is an example in which both ends of the earth plate and the earth plate arm are connected by springs while being attached.
When the earth removing work is not performed, the pulling force of the spring raises the front surface of the earth removing plate around the connecting pin between the earth removing plate arm and the earth removing plate, but the earth removing work is performed. At this time, due to the resistance force when pushing out the earth and sand, the earth discharging plate rotates clockwise around the pin against the spring force of the spring. With this configuration, when the boom is lowered by the boom cylinder to perform deep digging work, the boom hits the upper surface of the dump plate and prevents the boom from falling because the front surface of the dump plate is facing upward. There is no.

Further, in an earth-discharging plate device 50 having another structure as shown in FIG. 6, the earth-discharging plate arm 52 and the earth-discharging plate 53 which are elevated to the lower traveling body 51 are integrally welded structures. Is also known. This earth removing plate device 50 is used for a simple pushing work or landfill work, and
It is known to support the vehicle body by using the soil discharge plate device 50 as an outrigger device.

[0004]

However, in Japanese Utility Model Laid-Open No. 60-104464, in order to freely rotate the earth discharging plate with a spring, a considerable spring force is required in consideration of the case where the pin is rusted. Will be needed. Also, when working with the excavator plate of a hydraulic excavator, depending on the type of target object during excavation work, conditions such as ground leveling work, excavation work, etc. The working force, that is, the force acting to lay down the earth sewage plate facing up is greatly changed, and the height of the bottom surface of the earth scavenger plate is changed each time, and the finished surface is kept constant especially in leveling work. Is difficult. In order to prevent the boom from hindering the descending of the boom, it is essentially desirable to lie upright as parallel as possible to the arm of the dump plate. There is a problem that the board cannot be moved forward. In the running condition shown in the figure, the upper end surface 53a of the earth discharging plate 53 impairs the visibility of the front surface (L1) of the earth discharging plate 53 in the earth discharging device 50 shown in FIG. Further, when the soil discharging plate device 50 is used as an outrigger device, the road surface is damaged by the lower tip of the soil discharging plate, which causes a problem that road repair processing is required.

Focusing on the above-mentioned conventional problems, the present invention, when using the earth-discharging plate device as an outrigger device, ascends to the arm of the earth-discharging plate as much as possible, and surely moves the earth-discharging plate backward. The purpose of the invention is to improve the visibility of the excavator and the excavator plate device of the hydraulic excavator so as not to damage the road surface.

[0006]

[Means for Solving the Problems] To achieve the above-mentioned object, an earth-discharging plate arm attached to a lower traveling body so that it can be lifted up and down,
Hydraulic pressure composed of a soil discharge plate attached to the tip of the soil discharge plate arm, a lifting cylinder for raising and lowering the soil discharge plate arm, and a device for raising and lowering the soil discharge plate to raise the soil discharge plate on its back. In the shovel excavator plate device, when one side of the retractable telescopic cylinder attached to the excavator plate at one end and the other end to the excavator plate arm is swingably attached The front surface of the earth plate is substantially parallel to the upper surface of the earth plate arm. In addition, a plate member that comes into contact with the road surface when the vehicle body is supported is provided on the lower surface of the earth discharging plate arm.

[0007]

According to the above construction, when the earth removing work is performed by the earth removing machine of the hydraulic excavator, the elevating cylinder attached between the earth removing machine and the arm of the earth removing machine is used for the earth removing work at the longest position. If not, connect the telescopic rod and telescopic cylinder with the pin at the shortest position. When using the earth-discharging plate device as an outrigger, the lower surface of the arm tip portion is grounded after the earth-discharging plate is turned upside down.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An excavation plate device for a hydraulic excavator according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view of an excavator plate device for a hydraulic excavator according to the present invention, FIG. 2 is a side view of the excavator plate device for a hydraulic excavator according to the present invention when the excavator plate is facing upward, and FIG. 3 is a hydraulic diagram for the present invention. FIG. 5 is an explanatory view when the shovel excavator plate device is used as an outrigger device, and FIG. 5 is a plan view showing a partial cross section of the excavator excavator plate device.
As shown in FIG. 1, FIG. 2, FIG. 3, and FIG. 5, the lower traveling body 2 of the hydraulic excavator main body 1 includes an earth-discharging plate arm 3 that constitutes an earth-discharging plate device 30, and a earth-discharging plate arm lifting cylinder 5. One end of each is rotatably mounted by pins 6 and 7. The earth-discharging plate arm elevating cylinder 5 is arranged in the center of the vehicle body as shown in FIG. 5, and the other end of the earth-discharging plate arm elevating cylinder 5 is on the reinforcing member 15 that connects the left and right earth-discharging plate arms 3 and 3. It is attached to a pin 16 via a bracket 15a so as to be swingable. Further, the other ends of the left and right earth-discharging plate arms 3 and 3 are swingably attached to a pin 11 via brackets 9b fixed to the back surface of the earth-discharging plate 9, respectively.

The evacuation telescopic cylinder 40 of the earth shaving plate elevation device having the telescopic cylinder 12 and the telescopic rod 13.
Connects between the soil plate 9 and the soil plate arm 3,
One end is rotatably attached to the upper side of the rear surface of the earth discharging plate 9 by a pin 10 and the other end is rotatably attached to a bracket 3a provided outside the earth discharging plate arm 3 by a pin 8. In this figure, the telescopic rod 13 is attached by a pin 10 to brackets 9a welded to the left and right upper portions of the rear surface of the soil discharge plate 9, and the telescopic cylinder 1 is attached.
2 is a bracket 3a provided inside the earth plate arm 3
Although it is attached to, it may be attached to the opposite. The telescopic rod 13 slidably moves inside the telescopic Linda 12, and the pin 14 is inserted into the hole 13a during earth unloading work and into the hole 13b during non-earth unloading work to connect the two.

As shown in FIG. 2, when the earth unloading plate 9 is in the upright state and the earth unloading cylinder is at the minimum length when the earth unloading work is not performed, that is, the length of the telescopic rod 13 and the telescopic cylinder 12 is the minimum length. Telescopic rod 1 when connected by a pin
3 and the axis ef of the telescopic cylinder 12 are the earth plate arm 3
On the extension line of the line segment b-f between the swing fulcrum b and the fulcrum of attachment of the telescopic cylinder 12 to the soil plate arm 3. Further, the line segment connecting the upper and lower ends c and d of the front surface of the soil discharging plate 9 is rotated so as to be substantially parallel to the upper surface 3c of the soil discharging plate arm 3. Or, the line segment of the upper and lower ends of the soil discharge plate 9 is cd
When the axis line a-b of the soil discharge plate arm 3 is a reference line and the fulcrum b is the center, a predetermined angle α is provided in the clockwise direction, and the line segment ef is the line segment cd. It needs to be lower. The pin is not limited to the embodiment and may be a ball bearing type.

FIG. 3 uses the excavator plate of the hydraulic excavator of the present invention as an outrigger device. Further, as shown in FIG. 4, the road surface protection member 4 has a U-shaped cross section, and when the soil discharge plate 9 is used as an outrigger device, the soil discharge plate arm 3 can be completely grounded by the lifting cylinder 5. It is welded to its lower surface.

Next, the operation of the present invention will be described. As shown in FIG. 1 and FIG. 5, when excavating the earth, the telescopic cylinder 12 and the telescopic rod 13 should be connected to the longest, and the hole 1
If the pin 14 is passed through the pin 3a, the earth-discharging plate will be in a normal standing state, and the usual simple push-up work or landfill work can be performed. Next, as shown in FIG. 6, the excavation plate 9 is not turned down during excavation work or traveling, so that the height of the excavation plate 9 blocks the operator's view of the projected portion L1 of the excavation plate. Therefore, when the earth removing work is not performed, the connection between the telescopic cylinder 12 and the telescopic rod 13 should be minimized, and the hole 13b should be
Put the earth plate through the pin 14 and face up. In this state, even if the earth-discharging plate arm 3 is moved up and down by the same angle as in FIG. 6, the visibility of the earth-discharging plate is L2 because the projected part of the earth-discharging plate is L2.

Further, as shown in FIG. 3, when the earth-discharging plate device is used as an outrigger, since the earth-discharging plate is facing upward, the road surface protection member 4 on the front lower surface of the earth-discharging plate arm is grounded. It will not damage the road surface.

[0014]

Since the present invention is constructed as described above, the operator has a good visibility in the front portion of the vehicle body and the safety of work is secured. At the same time, when the soil shaving device is used as an outrigger, since the soil shaving plate is facing upward, the road surface protecting member 4 on the front lower surface of the soil shaving plate arm does not touch the road surface so that the road surface is not damaged. No need for subsequent repairs. Further, when the excavator plate device is traveling on a highly uneven site without being raised too much from the ground, it is possible to avoid that the vehicle body is tilted forward and the excavator plate is in heavy contact with the ground. Discomfort can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an excavating plate device for a hydraulic excavator according to the present invention during an excavating operation.

FIG. 2 is a view showing the soil discharge plate device of the hydraulic excavator of the present invention in a supine state.

FIG. 3 is a diagram showing the use of the excavator plate device of the hydraulic excavator of the present invention as an outrigger device.

FIG. 4 is a diagram showing a cross section I-I of FIG. 1.

5 is a view showing a cross section II-II in FIG. 1. FIG.

FIG. 6 is a view showing a state in which a soil discharge plate and a soil discharge plate arm of a conventional hydraulic excavator are raised while an earth displacement plate device having an integrally welded structure is raised.

[Explanation of symbols]

1 ... vehicle body, 2 ... undercarriage, 3 ... earth removal arm, 4 ... road surface protection member, 5 ... earth removal arm lifting cylinder, 9 ...
… Exhaust plate, 12… Telescopic cylinder, 13…
... Telescopic rod, 14 ... Pin, 3
0 ... Sheet-discharging plate device, 40 ... Extensible cylinder for facing up.

Claims (2)

[Claims] 1. An earth-moving plate arm attached to a lower traveling body so that the earth-moving body can be elevated, an earth-discharging plate attached to a tip of the earth-discharging plate arm, a lifting cylinder for elevating the earth-discharging plate arm, and an earth-discharging plate. In the soil excavator plate of the hydraulic excavator, which is composed of a device for raising the soil plate to the soil plate arm in an upright position, one end of the excavator plate is swingable and the other end is swingable to the soil plate arm. An excavator plate device for a hydraulic excavator, characterized in that the front surface of the excavator plate is substantially parallel to the upper surface of the excavator plate arm when the attached retractable cylinder for supine is retracted to the upward direction. 2. The excavator plate device for a hydraulic excavator according to claim 1, wherein a plate member that comes into contact with a road surface when the vehicle body is supported is provided on a lower surface of the excavator plate arm. .