JP3739629B2 - Sediment discharge device for wheel loader - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an earth and sand discharging device for a wheel loader used for excavation, loading and transportation of earth and sand in civil engineering and construction sites.
[0002]
[Prior art]
Conventionally, in a wheel loader, a boom for supporting a tiltable bucket for excavating, loading and transporting earth and sand is provided in front of a front frame, and the bucket is tilted by expansion and contraction of a rod of the bucket cylinder. The boom is lifted up or down by the expansion and contraction of the rod. The support part of the boom cylinder of the wheel loader having such a configuration is shown in FIG. The boom cylinder 17 has a circular arc trajectory in the upward and downward directions in a space formed between both side walls 14a of the upward cross-sectional U-shaped member 14 fixed to the upper surface of the axle 15 which is a part of the front frame. It is provided so that it can be tilted as depicted.
[0003]
[Problems to be solved by the invention]
However, in the conventional wheel loader, as shown in FIG. 7, the earth and sand drowned from the bucket by the forward / backward tilting operation of the bucket and the lifting operation of the boom are not applied to the cross-section U-shaped member 14 on the upper surface of the axle 15. The boom cylinder 17 that accumulates and descends while drawing a circular arc-like locus when the boom is lowered contacts the accumulated earth and sand, and the boom cylinder 17 cannot be lowered to the lowest position. The specification value could not be obtained.
[0004]
The present invention solves the above problem, and in a wheel loader that performs excavation and loading work of earth and sand by bucket tilting operation and boom lifting operation, the earth and sand accumulated on the front frame can be easily operated. An object of the present invention is to provide a soil load discharging device for a wheel loader that can automatically discharge.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is characterized in that a liftable boom for tiltably supporting a working bucket is rotatably arranged on a front frame of the vehicle, and the tilting operation of the bucket and the boom are performed. In a wheel loader that performs excavation and loading work of earth and sand by the lifting operation of the earth, a waste board that can be tilted forward in conjunction with the lifting action of the boom is provided on the front frame of the vehicle. The earth and sand covered on the upper surface of the earth discharging plate by the forward tilting operation is discharged.
[0006]
In the above configuration, the soil is drowned from inside the bucket by the forward / backward tilting operation of the bucket or the boom lifting operation when the soil is loaded into the bucket, and the drowned sediment is placed on the soil discharge plate provided on the front frame of the vehicle. However, the earth removal plate tilts forward in conjunction with the boom lift operation. Thereby, the earth and sand covered on the upper surface of the earth discharging board is discharged. Accordingly, the boom cylinder descending due to the arc movement when the boom descends does not come into contact with the accumulated earth and sand, and the boom cylinder can move to the lowest position.
[0007]
The invention according to claim 2 includes the boom cylinder that lifts the boom in the invention according to claim 1, and a link mechanism that tilts the earthing plate forward in conjunction with the operation of the boom cylinder. The boom cylinder has a base end rotatably supported on the frame, a boom cylinder pivot tip is pivotally supported at a position away from the boom pivot end, and the boom cylinder extends. By doing so, the boom is lifted while rotating around the base end portion, and the link mechanism is operated by the rotating operation of the boom cylinder.
[0008]
In the above configuration, the link mechanism is actuated by the pivoting motion of the boom cylinder during the boom lifting operation, and the earth discharging plate is tilted forward by this link mechanism. In this way, the earth removal plate can be operated easily and reliably without providing any power source separately.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
A wheel loader earth and sand discharging apparatus according to an embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show the overall configuration of the wheel loader. The wheel loader 1 includes a front frame 2 and a rear frame 3 that are pin-coupled (not shown) so as to be able to turn separately from each other, and a cab 4 is provided at the forefront of the rear frame 3. The frame 2 is provided with a tiltable work bucket 8 for excavating, loading and transporting earth and sand, and a liftable boom 5 for supporting the work bucket 8. The work bucket 8 includes a first arm. 9 and the second arm 10 are connected to the bucket cylinder 6, and the boom 5 is connected to the boom cylinder 7.
[0010]
3 and 4 show a mechanism for performing the lifting operation of the boom 5 and the tilting operation of the bucket 8. One end of the boom 5 is rotatably attached to the front frame 2, and the work bucket 8 is rotatably attached to the other end of the boom 5. A first arm 9 is rotatably mounted at a substantially central portion of the boom 5. A rod 6 r of the bucket cylinder 6 is connected to an upper end of the first arm 9, and a lower end of the first arm 9 is connected to the lower end of the first arm 9. One end of the second arm 10 is rotatably mounted, 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.
[0011]
The boom 5 that is rotatably mounted on the front frame 2 with the shaft 5 a is mounted on both sides of the upper surface of the front frame 2, and the rod 7 r of the boom cylinder 7 is rotatably mounted on the boom 5. By the extension of the rod 7r, the boom 5 tilts upward while drawing an arc around the axis 5a, and conversely, the boom 7 tilts downward by drawing the arc by the reduction of the rod 7r of the boom cylinder 7. In conjunction with the arc-like tilting operation of the boom 5, the boom cylinder 7 also tilts upward or downward with a circular arc around the shaft 7 a that connects the boom cylinder 7 and the front frame 2. When the boom 5 is in the lower position, the boom cylinder 7 is directed downward toward the tip of the rod 7r, and the boom cylinder 7 is close to the front frame 2. When the boom 5 ′ is lifted to the maximum, the bucket cylinder 6 ′ stands upright in conjunction with the lift operation of the boom 5 while contracting the rod, and the first arm 9 is operated by the rod contraction operation and the boom 5 lift operation. 'And the second arm 10' work together to prevent the bucket 8 'from tilting forward.
[0012]
FIG. 5 is a perspective view showing an interlocking mechanism between the boom cylinder and the earth discharging plate. At a position close to the front frame 2 of the boom cylinder 7, a soil discharge plate 11 for tilting forward in conjunction with the lift-up operation of the boom cylinder 7 and discharging earth and sand is tiltably provided. The earth removing plate 11 is attached to the bottom member 11a so as to be tiltable by a bracket 11c formed on the front side of the front frame 2, and side walls 11b having hems extending toward the rear of the front frame 2 at both ends of the bottom member 11a. The cross section is formed in an upward U-shape.
[0013]
One end of the link 13 is rotatably supported on the side wall 11b of the earth removing plate 11, and the other end of the link 13 is rotatably supported on the operation member 12 on the outer peripheral wall of the boom cylinder 7. The actuating 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 the opposite direction to the protruding piece 12b. A projecting piece 12b having a bifurcated joint shape is fixed to the outer peripheral wall of the boom cylinder 7, and a link 13 is rotatably supported on the mounting piece 12c.
[0014]
In the earth and sand discharging device of the wheel loader of the present embodiment described above, when the boom 5 is lifted, the boom cylinder 7 is tilted, and the link 13 ′ is pushed forward in conjunction with this, so that the earth discharging plate 11 is The earth and sand collected on the earth discharging plate 11 'is slid down by sliding forward. Thus, by utilizing the tilting operation of the boom cylinder 7, the earth and sand accumulated on the earth discharging plate 11 'can be slid down without providing any power source separately. Accordingly, the boom cylinder 7 does not come into contact with the accumulated earth and sand, and the boom cylinder 7 can move to the lowest position in the specification.
[0015]
The present invention is not limited to the configuration of the above embodiment, and various modifications can be made. A tilting drive source is provided on the earth discharging plate without interlocking the tilting operation of the earth discharging plate with the tilting operation of the boom cylinder, and when the boom cylinder reaches a height above a predetermined level, the sensor is activated to drive the tilt driving source. The tilting plate can be tilted, and when the boom cylinder is higher than a predetermined height, the driver drives the tilting drive source with the manual switch provided in the driver's seat, and the It can also be tilted.
[0016]
【The invention's effect】
As described above, according to the earth and sand discharging device of the wheel loader, during the work of excavating and loading the earth and sand by the tilting operation of the bucket and the lifting operation of the boom, the earth discharging plate is interlocked with the lifting operation of the boom. It can be tilted forward, and the earth and sand covered on the top surface of the earth removal board can be slid down. By sliding the earth and sand from the earth discharging plate, the boom cylinder descending due to the arc movement when the boom descends does not come into contact with the accumulated earth and sand, and the boom cylinder 7 can move to the lowest position, Work machines such as buckets and booms can always be used optimally.
[0017]
By transmitting the pivoting motion of the boom cylinder during the boom lifting operation to the link mechanism, the link mechanism is operated, and the earth discharging plate is tilted forward, so that a simple power source is not required. The earth removal board can be operated reliably with the 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 lifting operation and a bucket tilting operation.
FIG. 4 is an enlarged side view of the mechanism.
FIG. 5 is a perspective view showing a sediment discharge 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 the conventional structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Wheel loader 2 Front frame 5 Boom 7 Boom cylinder 8 Work bucket 11 Earth removal board 13 Link

Claims (2)

A liftable boom that supports the working bucket in a tiltable manner is rotatably disposed on the frame of the front of the vehicle, and a wheel that performs excavation and loading work of earth and sand by the tilting operation of the bucket and the lifting operation of the boom In the loader,
On the frame at the front of the vehicle, there is provided a soil discharge plate that can be tilted forward in conjunction with the lift operation of the boom, and the soil covered on the top surface of the soil discharge plate is discharged by the forward tilt operation of the soil discharge plate. An earth and sand discharging device for a wheel loader, characterized in that: A boom cylinder for lifting the boom;
A link mechanism for moving the earth discharge plate forward in conjunction with the operation of the boom cylinder,
The boom cylinder has a base end portion rotatably supported on the frame, and a pivot tip end portion of the boom cylinder is rotatably supported at a position away from the pivot end of the boom. 2. The cylinder according to claim 1, wherein the boom is lifted while rotating about a base end portion of the cylinder by extension, and the link mechanism is operated by the rotation of the boom cylinder. The earth and sand discharging apparatus of the wheel loader according to 1.

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