JP4143194B2 - Bucket claw for excavator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bucket claw that is detachably attached to an excavator such as a power shovel, and in particular can excavate even hard soil containing gravel or sandstone-like highly wearable soil and can be used for a long time. Regarding bucket claws.
[0002]
[Prior art and problems to be solved by the invention]
A bucket of an excavator such as a power shovel is provided with a number of claws for excavation at the tip. FIG. 9 shows a standard bucket pawl currently used. The bucket claw 1 includes a wedge-shaped main body portion 11, a hollow portion 12 into which the claw engaging portion is fitted, a hole 13 for fixing to the bucket engaging portion with a pin, and a blade edge portion 14. Various kinds of nails having a blade edge deformed according to the application are prepared. For example, when excavating rocky soil, a rock bucket claw with a blade tip protruding like a bowl is used.
[0003]
However, when excavating soil with significant wear resistance against iron bucket claws, such as sandstone and conglomerate, bucket pawls with a flat tip edge have a low bite into the soil and the amount of excavation is small. There is a problem that the wear of the metal is remarkable and the life is short. If a rock-like rock bucket is used as a bucket claw, the bite is deep, but there is a limit to improving efficiency. In addition, when excavating with a rock bucket, claw marks remain on the ground as a groove, and in some cases, it is necessary to level the ground surface after excavation, which increases the amount of extra work, which is not preferable.
[0004]
Accordingly, an object of the present invention is to provide a bucket claw that can be efficiently excavated even in hard soil containing gravel or sandstone-like highly wearable soil and can be used with a long life.
[0005]
[Means for Solving the Problems]
As a result of intense research in view of the above object, the present inventor has provided a two edge portions of sharp polygonal pyramid on the tip of the nail, the thin plate portion interposed integrally between the two cutting edges Then, it was discovered that the excavation speed can be improved while suppressing wear, and the present invention has been conceived.
[0006]
That is, the bucket pawl for the excavator of the present invention has a quadrangular pyramid shape having a substantially rhombic cross section or a triangular pyramid shape having a flat bottom surface which is substantially on the same plane so as to have cutting edges on the inside and outside. The blade edge portion is provided in a V-shaped bifurcated shape at the distal end portion of the wedge-shaped main body portion, and is positioned on a plane connecting the center axis of the blade edge portion, and almost the entire inside of the blade edge portion is integrated. And a tip of the thin plate part slightly recedes from a tip of the blade edge part .
[0007]
Preferred Embodiment of the Invention
[1] First Embodiment FIG. 1 shows an example of a bucket claw of the present invention, and FIGS. 2 to 4 show a side surface, a plane, and a cross section, respectively. The bucket claw 1 of the present invention comprises a main body part 11 having a wedge shape and a tip part that bites into the soil during excavation. The tip part includes a hollow part 12 into which a claw engaging part of the bucket is fitted, and a bucket engagement. a hole 13 for fixing a pin to the engaging portion, and the two polygonal pyramid cutting part 14 provided on the forked connecting between two of said polygonal pyramid cutting part 14 integrally thin plate portion 15 It consists of.
[0008]
In the present embodiment, each blade edge portion 14 has a quadrangular pyramid shape having a substantially rhombic cross section as shown in FIG. Each blade edge portion 14 has outer surfaces 14a and 14a that intersect at a large angle and inner surfaces 14b and 14b that intersect at a small angle. A ridge line 14e formed by the intersection of the outer side surfaces 14a and 14a projects outwardly from the front end to the rear end, and is located on the outermost side at a point 14c and is connected to an inclined surface 21a continuous with the side surface 21. 3 and 4, the upper and lower ridge lines 16a and 16b project upward and downward, respectively, and contact the inclined surfaces 11a and 11a continuous from the main body 11 at points 14d and 14d. The outermost ridgelines 14e and 16a, 16b of each blade edge portion 14 have the action of the blade edge.
[0009]
As shown in FIG. 4, the angle γ ₂ formed by the two inner side surfaces 14b, 14b is smaller than the angle γ ₁ formed by the two outer side surfaces 14a, 14a. The angle γ ₁ is preferably about 45 ° to 90 °, and the angle γ ₂ is preferably about 20 ° to 60 °. In FIG. 2, the angle α formed by the upper and lower ridge lines 16a and 16b is preferably about 20 ° to 40 °. Further, in FIG. 3, the angle β formed by the ridgelines 16a and 16a of the both blade edge portions 14 and 14 is preferably about 5 ° to 15 °.
[0010]
A thin plate portion 15 that integrally connects the two blade tip portions 14 is formed. The plate portion 15 is located on a plane including the central axis of the both blade edge portions 14, and the tips thereof are slightly retracted from the tips of the both blade edge portions 14 (the plate portion 15 is slightly shorter than the both blade edge portions 14). The thickness of the plate portion 15 depends on the size of the bucket claw, but is preferably set to be about 1 to 5 mm when the total length of the bucket claw is 20 to 30 cm, for example. The ridge lines 15a and 15a where the inner side surfaces 14b and 14b of the two blade edge portions 14 and 14 are connected to the plate portion 15 are inclined inward at a slightly larger angle than the outer ridge line 14e. The angle θ formed by the inner ridgelines 15a, 15a is preferably in the range of about 20 ° to 60 °.
[0011]
Thus, each blade edge portion 14 has a substantially quadrangular pyramid shape with the points 14c and 14d as the outermost ends, and a triangular plate portion 15 is integrally interposed therebetween. Using a bucket claw having a tip portion having such a shape can provide an advantage that it can be excavated efficiently even in rocky soil, soil containing gravel, etc., and wear during excavation is small. This is thought to be because rocks and gravel at the cutting edge are pushed into the inside of the two cutting edge portions 14 and 14 and are cut by the plate portion 15. Further, since the two outer ridge lines 14e and 14e are slightly inclined inward toward the tip, there is also an advantage that the cutting edge portions 14 and 14 can easily enter the soil.
[0012]
Since the bucket pawl 1 of the present invention has a quadrangular pyramid shape as described above, each surface 14a, 14a, 14b, 14b is worn on average by excavation, and the shape of the quadrangular pyramid is hardly changed. Therefore, the problem with the conventional bucket pawl that the excavation ability is reduced during use is solved.
[0013]
[2] Second Embodiment FIG. 5 shows another example of the bucket pawl of the present invention, and FIGS. 6 to 8 show a bottom surface, a side surface, and a cross section, respectively. The bucket claw 2 of this embodiment also comprises a main body part 11 having a wedge shape and a tip part that bites into the soil during excavation, the tip part having a hollow part 12 into which a claw engaging part of the bucket is fitted, and a bucket a hole 13 for fixing a pin to the engaging portion, connecting between the bifurcated into two provided polygonal pyramid cutting edge 14 and two of the polygonal pyramid cutting part 14 integrally thin plate portion 15 It consists of. The shape of the main body 11 of the bucket claw 2 may be the same as the shape of the main body of the bucket claw 1 of FIG.
[0014]
In this embodiment, as shown in FIGS. 5 and 8, each blade edge portion 14 has a quadrangular pyramid shape close to a triangular pyramid having a ridge line 16a projecting upward and a ridge line 14e projecting outward, and the ridge lines 16a and 14e are Has the action of a cutting edge. On the other hand, as shown in FIGS. 6 and 8, the bottom surface 14 b ′ of the blade portion 14 has a substantially planar shape continuous from the bottom surface of the main body portion 11, and is substantially flush with the bottom surface 15 b ′ of the plate portion 15. It is.
[0015]
In the blade edge portion 14, as in the first embodiment, the ridge line 14 e intersects the outer surfaces 14 a and 14 a ′, projects outward from the front end to the rear end, and is located on the outermost side at the point 14 c. It is connected to an inclined surface 21 a continuous with the side surface 21. Further, the upper ridge line 16a projects upward and contacts the inclined surface 11a continuous from the main body 11 at a point 14d. On the other hand, the ridge line 16b ′ is formed by intersecting the outer side surface 14a ′ and the side surface 14b ′, and the two ridge lines 16b ′ are provided substantially in parallel.
[0016]
As shown in FIG. 8, the angle γ ₁ formed by the two outer surfaces 14a and 14a ′ is preferably about 45 ° to 90 °, and the angle γ ₂ formed by the inner surface 14b and the bottom surface 14b ′ is about 20 °. It is preferably ˜60 °. In FIG. 7, the angle α ′ formed by the ridge line 16a and the bottom surface 14b ′ is preferably about 20 ° to 40 °. The angle formed by the ridge lines 16a and 16a of the two blade edge portions 14 and 14 is preferably about 5 ° to 15 °, like the angle β in the first embodiment.
[0017]
As shown in FIGS. 5 and 8, the ridge line 15a where the plate portion 15 that integrally connects the two blade edge portions 14 and the inner side surfaces 14b, 14b of the two blade edge portions 14 intersects is slightly larger than the outer ridge line 14e. Inclined inward at an angle. The angle θ ′ formed by the ridge lines 15b, 15b on the inner sides of the blade edges 14, 14 is in the range of about 20 ° to 60 °.
[0018]
Thus, each blade edge portion 14 has a substantially quadrangular pyramid shape composed of three outer side surfaces 14a, 14a ′, 14b and a bottom surface 14b ′, and has ridge lines 14e, 16a having the action of the blade edge. By using the cutting edge portion 14 having such a shape, similarly to the first embodiment, it is possible to easily excavate soil containing gravel or rocky soil, and there is an advantage that wear during excavation is small. At the same time, since the bottom surface is flat, a flat excavation surface is obtained.
[0019]
The bucket pawl of the present invention is preferably manufactured integrally from cast iron or cast steel in any of the embodiments. Further, the main body part 11, the hollow part 12, and the bucket engaging hole 13 can be the same as the conventional one.
[0020]
Although the present invention has been described with reference to the accompanying drawings, the present invention is not limited thereto, and various modifications can be made without departing from the spirit of the present invention. For example, it is natural that the shape of the main body can be changed for excavators such as various excavators, and the size can be changed for buckets of various sizes.
[0021]
【The invention's effect】
As described above in detail, the bucket pawl of the present invention has a triangular pyramid shape having a substantially rhombus cross section or a flat bottom surface that is substantially on the same plane so as to have cutting edges inside and outside. because it has a thin plate portion for integrally connecting the conical cutting edge, it is possible to excavate efficiently even wear highly soils such as hard soil or sandstone containing gravel, has excellent durability So it can be used for a long time without replacement. The bucket pawl of the present invention having such features can be widely used for excavators such as power shovels and bulldozers, and other civil engineering machinery equipment.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a bucket claw for an excavator according to the present invention.
FIG. 2 is a partial cross-sectional side view showing an example of a bucket pawl for an excavator according to the present invention.
FIG. 3 is a plan view showing an example of a bucket claw for an excavator according to the present invention.
4 is a cross-sectional view taken along the line AA in FIG. 3;
FIG. 5 is a perspective view showing another example of the bucket pawl for the excavator of the present invention.
6 is a perspective view showing the bottom surface of the excavator bucket claw shown in FIG. 5. FIG.
FIG. 7 is a partial sectional side view showing another example of the bucket pawl for the excavator of the present invention.
8 is a cross-sectional view taken along the line BB in FIG.
FIG. 9 is a perspective view showing an example of a conventional excavator bucket claw.
[Explanation of symbols]
1, 2, ... Bucket claw
11 ... Main body
11a, 21a ... inclined surface
12 ... Hollow part
13 ... hole
14 ... Cutting edge
14a, 14a '... outer surface
14b ... Inside surface
14b '... Bottom
15a ... Outside ridge line
16a, 16b, 16b '... Ridge line
21, 21 '・ ・ ・ side surface of main body

Claims (7)

A quadrangular pyramid-shaped cutting edge portion having a generally rhombic cross section so as to have cutting edges on the inner side and the outer side is provided in a V-shaped bifurcated shape at the tip of the wedge-shaped main body portion. connecting the center axis located on the plane have a thin plate portion connecting integrally almost the entire inside of the cutting edge portion, the distal end of the thin portion that is slightly recessed from the tip of the cutting edge A bucket claw for excavator. A triangular pyramid-shaped cutting edge having a flat bottom surface that is substantially flush with the inner and outer cutting edges is provided in a V-shaped bifurcated shape at the tip of the wedge-shaped body. A thin plate portion that is positioned substantially on the same plane as the bottom surface of the blade edge portion and integrally connects substantially the entire inside of the blade edge portion, and the tip of the thin plate portion is slightly smaller than the tip of the blade edge portion. A bucket claw for an excavator characterized by being retreated . In excavator bucket claw according to claim 1 or 2, excavator bucket claw, wherein the thickness of the thin portion is 1 to 5 mm. The bucket claw for an excavator according to any one of claims 1 to 3, wherein the inner cutting blade has an acute angle with respect to the outer cutting blade of each blade edge portion . In excavator bucket claw according to any one of claims 1-4, two angle formed outer surface Ri about 45 ° to 90 ° der, angle the two inner surfaces forms the respective edge portions about 20 Bucket claw for excavator characterized by ° ~ 60 ° . The bucket claw for an excavator according to any one of claims 1 to 5, wherein an angle formed by a ridge line that forms a cutting blade inside the two blade tips is about 20 ° to 60 °. Bucket nails. In the bucket claw for excavator according to any one of claims 1 to 6 , a ridge line formed by intersecting an outer side surface and an inner side surface of one cutting edge portion, and an outer side surface and an inner side surface of the other cutting edge portion. An excavator bucket claw characterized in that an angle formed by intersecting ridge lines is about 5 ° to 15 °.

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