JP2001303605A - Sediment discharging apparatus of wheel loader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discharge sediment accumulated on the top surface of a front frame in the case of the work for excavating and loading with the sediment by utilizing a simple composition, the tilting motion of a working bucket and the lifting motion of a boom. SOLUTION: A blade 11 mounted tiltably on the front frame 2 is connected with a working member 12 of a boom cylinder 7 by a link 13, which is pushed out forward by the rotation of the boom cylinder 7 in conjunction with the lifting motion of the boom for the forward-tilting motion of the blade 11 to allow the sediment accumulated on the blade 11 to be discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth and sand discharging device for a wheel loader used for excavating, loading and transporting earth and sand at a civil engineering and construction site.

[0002]

2. Description of the Related Art Conventionally, in wheel loaders,
A boom is provided in front of the front frame to support a tiltable bucket for excavating, loading, and transporting earth and sand. The bucket is tilted by the expansion and contraction of the bucket cylinder rod, and the boom is lifted by the expansion and contraction of the boom cylinder rod. Alternatively, it has a structure for lifting down. FIG. 6 shows a support portion of the boom cylinder of the wheel loader having such a configuration. Boom cylinder 1
Numeral 7 denotes both side walls 1 of an upwardly facing U-shaped section member 14 fixed to the upper surface of an axle 15 which is a part of a front frame.
The space 4a is tiltably provided in a space formed between the upper and lower sides so as to draw an arc-shaped trajectory upward and downward.

[0003]

However, in the conventional wheel loader, as shown in FIG. 7, the earth and sand damaged from inside the bucket by the forward / backward tilting operation of the bucket and the lifting operation of the boom are cross-sectionally formed on the upper surface of the axle 15. Sediment accumulates on the U-shaped member 14, and the descending boom cylinder 17 draws an arc-shaped trajectory when the boom descends, contacts the accumulated sediment, and the boom cylinder 17 descends to the lowest position. In some cases, it was not possible to obtain specifications for the working machine.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. In a wheel loader for excavating and loading earth and sand by a bucket tilt operation and a boom lift operation, the earth and sand accumulated on a front frame is simplified. It is an object of the present invention to provide a wheel loader earth and sand discharging device that can automatically discharge the sand and sand during work.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a liftable boom for tiltably supporting a work bucket is rotatably mounted on a frame at a front portion of a vehicle. In a wheel loader that is disposed and performs excavation and loading work of earth and sand by a tilt operation of a bucket and a lift operation of a boom, an earth removal plate that can tilt forward on a frame at a front part of the vehicle in conjunction with the lift operation of the boom. Is provided, and the earth and sand covered on the upper surface of the earth removal plate is discharged by the forward tilting operation of the earth removal plate.

[0006] In the above configuration, the earth and sand is damaged from the inside of the bucket by the forward / backward tilting operation of the bucket and the lifting operation of the boom when the earth and sand are loaded into the bucket, and the damaged earth and sand is discharged from a frame provided on the front frame of the vehicle. Although collected on the earth plate, the earth removal plate moves forward in conjunction with the boom lift operation. Thereby, the earth and sand covering the upper surface of the earth discharging plate is discharged. Therefore, the boom cylinder descending due to the arc motion at the time of the boom lowering does not come into contact with the accumulated earth and sand, and the boom cylinder can move to the lowest position.

According to a second aspect of the present invention, in the first aspect of the present invention, there is provided a boom cylinder for lifting the boom, and a link mechanism for tilting the discharge plate forward in conjunction with the operation of the boom cylinder. A boom cylinder having a base end rotatably supported on the frame, a boom cylinder rotatable distal end rotatably supported at a position away from the boom rotation end, and a boom While the cylinder extends, it rotates around its base end,
The boom is lifted, and the link mechanism is operated by rotating the boom cylinder.

In the above configuration, the link mechanism is operated by the rotation of the boom cylinder when the boom is lifted, and the earth discharging plate is tilted forward by the link mechanism. In this way, the earth removal plate can be easily and reliably operated without separately providing any power source.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a wheel loader according to an embodiment of the present invention. 1 and 2 show the overall configuration of the wheel loader. The wheel loader 1 is composed of a front frame 2 and a rear frame 3 which are pin-coupled (not shown) so as to be able to turn separately from each other. Frame 2
, A tiltable work bucket 8 for excavating, loading and transporting earth and sand, and a liftable boom 5 that supports the work bucket 8 are arranged. The work bucket 8 includes a first arm 9 and The bucket cylinder 6 is connected via the second arm 10, and the boom cylinder 7 is connected to the boom 5.

FIGS. 3 and 4 show a mechanism for performing a lifting operation of the boom 5 and a tilting operation of the bucket 8. Boom 5
Is rotatably mounted on the front frame 2, and a work bucket 8 is rotatably mounted on the other end of the boom 5. A first arm 9 is rotatably mounted substantially at the center of the boom 5, and a rod 6 r of a bucket cylinder 6 is connected to an upper end of the first arm 9.
One end of a second arm 10 is rotatably mounted on the lower end of the arm, and the other end of the second arm 10 is rotatably mounted near the mounting point of the work bucket 8 of the boom 5.

The boom 5 rotatably mounted on the front frame 2 with the shaft 5a is mounted on both sides of the upper surface of the front frame 2, the rod 7r of the boom cylinder 7 is rotatably mounted on the boom 5, Due to the extension of the rod 7r of the cylinder 7, the boom 5 tilts upward in an arc about the shaft 5a, and conversely, tilts downward in an arc due to the contraction of the rod 7r of the boom cylinder 7. In conjunction with the arc-shaped tilting operation of the boom 5, the boom cylinder 7 also tilts upward or downward in an arc around a shaft 7a connecting the boom cylinder 7 and the front frame 2. When the boom 5 is at the lower position, the boom cylinder 7 is directed downward as it approaches the tip of the rod 7r, and the boom cylinder 7 approaches the front frame 2. When the boom 5 'is lifted to the maximum, the bucket cylinder 6' stands up in conjunction with the lifting operation of the boom 5 while reducing the rod, and the first arm 9 is moved by the rod's reducing operation and the lifting operation of the boom 5.
'And the second arm 10' work together to prevent the bucket 8 'from tilting forward.

FIG. 5 is a perspective view showing an interlocking mechanism of the boom cylinder and the earth discharging plate. At a position close to the front frame 2 of the boom cylinder 7, there is a tilting plate 11 for tilting forward in conjunction with a lift-up operation of the boom cylinder 7 to discharge earth and sand. Earth removal plate 11
Is a bracket 1 formed on the front side of the front frame 2
A bottom member 11a attached to be tiltable by 1c and side walls 11b flared toward the rear of the front frame 2 at both end portions of the bottom member 11a are formed in a U-shape with an upward section.

One end of a link 13 is rotatably supported on a side wall 11b of the earth discharging plate 11, and the other end of the link 13 is rotatably supported on an operating member 12 on the outer peripheral wall of the boom cylinder 7. . The operating member 12 has a substantially bifurcated joint shape including a protruding piece 12b formed at the center of the flat plate member 12a, and a mounting piece 12c formed by bending both ends of the flat plate member 12a in a direction opposite to the protruding piece 12b. A bifurcated joint-shaped projecting piece 12b is fixed to the outer peripheral wall of the boom cylinder 7, and a link 13 is rotatably supported on the mounting piece 12c.

In the above-described apparatus for discharging the earth and sand of the wheel loader according to the present embodiment, the boom cylinder 7 is tilted when the boom 5 is lifted, and the link 13 'is interlocked with the tilt.
Is pushed forward, so that the earth discharging plate 11 leans forward and slides down the earth and sand accumulated on the earth discharging plate 11 ′. In this manner, by utilizing the tilting operation of the boom cylinder 7, it is possible to provide the earth discharging plate 11 without providing any power source separately.
'Sludge that has accumulated on the top can be slid off. Therefore, the boom cylinder 7 does not come into contact with the accumulated earth and sand, and the boom cylinder 7 can move to the lowermost position of the specification.

The present invention can be variously modified without being limited to the configuration of the above embodiment. A tilting drive source is provided on the dumping plate without interlocking the tilting operation of the dumping plate with the tilting operation of the boom cylinder, and when the boom cylinder reaches a predetermined height or more, the sensor operates to drive the tilting drive source. Also, when the boom cylinder is at a predetermined height or higher, the driver drives the tilt drive source with a manual switch provided in the driver's seat to remove the soil removal plate. It can also be tilted.

[0016]

As described above, according to the earth and sand discharging device of the wheel loader, during the work of excavating and loading earth and sand by the tilting operation of the bucket and the lifting operation of the boom, the operation is linked with the lifting operation of the boom. The earth removal plate can be tilted forward to slide down the earth and sand covering the upper surface of the earth removal plate. By sliding the earth and sand down from the earth removal plate, the boom cylinder descending by the circular motion when the boom descends does not contact the accumulated earth and sand,
The boom cylinder 7 can be moved to the lowermost position, and a work machine such as a bucket or a boom can always be used optimally.

By transmitting the rotation of the boom cylinder to the link mechanism during the boom lift operation, the link mechanism is operated, and the earth discharging plate is tilted forward, so that a separate power source is not required. In addition, the earth discharging plate can be reliably operated with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a side view of a wheel loader according to an embodiment of the present invention.

FIG. 2 is a plan view of the wheel loader.

FIG. 3 is a side view showing a mechanism for performing a boom lift operation and a bucket tilt operation.

FIG. 4 is an enlarged side view of the mechanism.

FIG. 5 is a perspective view showing the earth and sand discharging device of the wheel loader.

FIG. 6 is a perspective view showing a front frame structure of a conventional wheel loader.

FIG. 7 is an explanatory side view showing a problem in a conventional structure.

[Description of Signs] 1 wheel loader 2 front frame 5 boom 7 boom cylinder 8 work bucket 11 earth removal plate 13 link

Claims (2)

[Claims] A liftable boom for supporting a work bucket in a tiltable manner is rotatably disposed on a frame at a front portion of a vehicle, and excavation and digging of earth and sand is performed by tilting operation of the bucket and lifting operation of the boom. In a wheel loader that performs a loading operation, on a frame at a front portion of the vehicle, a discharging plate that is capable of performing a forward tilt operation in conjunction with a lift operation of the boom is provided. An earth and sand discharging device for a wheel loader, which discharges earth and sand covered on a plate upper surface. 2. A boom cylinder for lifting the boom, and a link mechanism for tilting the discharge plate forward in conjunction with the operation of the boom cylinder, wherein the base end of the boom cylinder is a frame. The boom cylinder is rotatably supported at an upper end thereof, and the rotation end of the boom cylinder is rotatably supported at a position away from the rotation end of the boom,
By extending the boom cylinder, the boom is lifted while rotating around its base end,
The earth and sand discharging device of a wheel loader according to claim 1, wherein the link mechanism is operated by a rotation operation of the boom cylinder.