JP3248190U - Hydraulic excavator attachments - Google Patents

Abstract

[Problem] To provide an attachment for a hydraulic excavator that can easily process stumps, etc. [Solution] A hydraulic excavator attachment 20 has a mounting part 21 that is detachably attached to the tip side of the arm of a hydraulic excavator, a thick plate-like main body part 22 extending from the mounting part, a blade part 23 that protrudes from the main body part by extending forward from the front part of the tip side of the main body part in the fore-and-aft direction of the hydraulic excavator or extending rearward from the rear part of the tip side of the main body part in the fore-and-aft direction of the hydraulic excavator, and a curved plate-like fulcrum part 24 that is formed in an arc shape so as to smoothly connect from the tip part 22a of the main body part to the rear part of the tip side or the front part of the tip side opposite the blade part, and that extends by a predetermined width on both sides in the plate thickness direction of the main body part that is perpendicular to the fore-and-aft direction of the hydraulic excavator. [Selected Figure] Figure 2

Description

This invention relates to an attachment for a hydraulic excavator that is attached to the tip of the arm of the hydraulic excavator for processing stumps, etc.

Conventionally, hydraulic excavators used in construction and civil engineering work are configured to be able to handle a variety of tasks by changing the attachments attached to the tip of the arm. For example, for excavation work, a bucket capable of scooping up soil and sand is attached to the arm. For gripping work, such as grabbing wood, a fork claw is attached to the arm. For example, Patent Documents 1 and 2 describe hydraulic excavator attachments equipped with shearing blades used in crushing reinforced concrete.

Japanese Unexamined Patent Publication No. 7-127280 Japanese Utility Model Application Publication No. 5-54655

When leveling densely planted areas, such as forests or fields, it is necessary to remove stumps and underground stems of trees and other plants. However, these stumps have roots that extend widely or deeply into the ground, making them difficult to remove by hand, so construction machinery is used to remove them.

For example, digging up a stump using a hydraulic excavator equipped with a bucket is not easy because the roots underground get in the way, and it is also difficult to grasp and pull out the stumps using fork claws, for example. It is also possible to shear and crush stumps using hydraulic excavator attachments such as those in Patent Documents 1 and 2, but this is not easy because the roots and rhizomes are buried underground.

Therefore, the purpose of this invention is to provide an attachment for a hydraulic excavator that can easily handle stumps and other debris.

The hydraulic excavator attachment of the invention of claim 1 is characterized by having a mounting part that is detachably attached to the tip of the arm of the hydraulic excavator, a thick plate-shaped main body extending from the mounting part, a blade extending forward from the front tip of the main body in the fore-and-aft direction of the hydraulic excavator or extending rearward from the rear tip of the main body and protruding from the main body, and a curved plate-shaped fulcrum part formed in an arc shape so as to smoothly connect from the tip of the main body to the rear tip or front tip on the opposite side to the blade, the curved plate-shaped fulcrum part extending a predetermined width on both sides in the plate thickness direction of the main body perpendicular to the fore-and-aft direction.

According to the above configuration, the hydraulic excavator attachment attached to the tip of the arm of the hydraulic excavator can move the blade, which is the point of application, upward by abutting the curved plate-shaped fulcrum part against the ground and functioning as the fulcrum of the lever, and tilting the main body part toward the opposite side to the blade part so that the attachment side, which is the point of force, approaches the ground. Therefore, for example, the blade part can be thrust into the side of a stump and moved upward to pull out or cut the stump, and for example, the blade part can be thrust into the ground and moved upward to cut or pull up the roots of plants underground. At this time, the load at the fulcrum is distributed by the curved plate-shaped fulcrum part, so that the sinking of the hydraulic excavator attachment into the ground can be reduced. Therefore, the decrease in the amount of upward movement of the blade part is suppressed, and stumps, etc. can be easily processed.

The hydraulic excavator attachment of the invention of claim 2 is characterized in that, in the invention of claim 1, the blade portion has a first double blade extending from the cutting edge toward the middle of the main body, and a second double blade extending from the cutting edge toward the tip side of the main body.
According to the above-mentioned configuration, the cutting edge of the blade is sharpened and the blade can be easily inserted straight, improving workability.

The attachment for a hydraulic excavator according to the invention of claim 3 is characterized in that, in the invention of claim 1, the width of the curved plate-shaped fulcrum portion becomes narrower as it approaches the cutting edge.
According to the above-mentioned configuration, the resistance of the curved plate-shaped fulcrum when the blade is thrust can be reduced, and the blade can be thrust deeper. Also, the more the main body is tilted to move the blade upward, the wider the curved plate-shaped fulcrum that comes into contact with the ground becomes, dispersing the load and making it difficult for the hydraulic excavator attachment to sink into the ground.

The attachment for a hydraulic excavator of the invention of claim 4 is characterized in that, in the invention of claim 1, the tip portions on both sides in the plate thickness direction of the curved plate-shaped fulcrum portion are chamfered on the curved inner surface side to be formed into a single-edged shape.
According to the above-mentioned configuration, while maintaining the area of the curved plate-shaped fulcrum part that contacts the ground, the attachment for a hydraulic excavator can be moved in the width direction, for example, to function as a bucket for scooping up earth and sand. Therefore, there is no need to change the attachment or alternate between hydraulic excavators with different attachments, improving workability.

The hydraulic excavator attachment of this invention makes it easy to deal with stumps and other debris.

1 is a side view of a hydraulic excavator according to an embodiment of the present invention. 1 is a perspective view of an attachment for a hydraulic excavator according to an embodiment of the present invention; FIG. 3 is a view of the hydraulic excavator attachment of FIG. 2 as viewed from a different angle. FIG. 2 is an enlarged view of a main portion showing a blade portion of the hydraulic excavator attachment. 1A to 1C are diagrams showing an example of stump processing according to an embodiment of the present invention. FIG. 6 is a diagram showing an example of lifting the stump of FIG. 5 .

Below, we will explain the form for implementing this invention based on examples.

As shown in FIG. 1, the hydraulic excavator 1 has a hydraulic excavator body 2, a boom 4 connected to the hydraulic excavator body 2 by a horizontal connecting pin 3, an arm 6 whose base end is connected to the tip of the boom 4 by a horizontal connecting pin 5, a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9. The boom cylinder 7 uses hydraulic pressure to rotate the boom 4 within a predetermined range around the connecting pin 3 relative to the hydraulic excavator body 2. The arm cylinder 8 uses hydraulic pressure to rotate the arm 6 within a predetermined range around the connecting pin 5 relative to the boom 4.

A link mechanism 6a is attached to the tip of the arm 6. A hydraulic excavator attachment (hereinafter referred to as the attachment 20) is connected to the tip of the arm 6 and the link mechanism 6a by two horizontal connecting pins 10, 11. The bucket cylinder 9 uses hydraulic pressure to rotate the attachment 20 around the connecting pin 10 within a specified range relative to the arm 6.

The hydraulic excavator body 2 has a lower traveling body 13 equipped with a pair of left and right crawlers, and an upper rotating body 15 equipped with a driver's cab 14 that is rotatably mounted on the upper part of the lower traveling body 13 and in which the operator sits. The upper rotating body 15 is equipped with a hydraulic pump (not shown) as a hydraulic supply source, and an engine (not shown) that drives the hydraulic pump, the lower traveling body 13, and the upper rotating body 15. In the following description, the front of the driver's cab 14 is defined as the front of the hydraulic excavator 1, and the left and upper sides of the driver's cab 14 are defined as the left and upper sides of the hydraulic excavator 1, respectively. Arrows F, L, and U in the figure represent the front, left, and upper sides of the hydraulic excavator 1, respectively.

The connecting part 16 to which the boom 4 and the boom cylinder 7 are connected is connected by a vertical connecting pin to the front end of the upper rotating body 15, which is in front of the cab 14, and the attachment 20 attached to the tip of the arm 6 is located in front of the cab 14 so that it is easily visible to the operator. Based on the operation of the operator, the hydraulic excavator 1 drives the boom cylinder 7, arm cylinder 8, and bucket cylinder 9 to move the boom 4, arm 6, and attachment 20, rotate the upper rotating body 15, or travel the lower traveling body 13. In addition, by driving a swing cylinder (not shown) that connects the upper rotating body 15 and the connecting part 16, the connecting part 16 can be rotated in the left-right direction within a predetermined range relative to the upper rotating body 15, and the boom 4 to the attachment 20 can be rotated in the left-right direction.

As shown in Figures 2, 3, and 4, the attachment 20 for processing stumps, rhizomes, etc. has a mounting part 21 that is detachably attached to the tip of the arm 6 by two connecting pins 10, 11, a thick plate-like main body part 22 extending from the mounting part 21, a blade part 23 protruding from the main body part 22, and a curved plate-like fulcrum part 24. Note that, although a case in which the main body part 22 extends downward from the mounting part 21 and the blade part 23 protrudes backward from the rear part of the tip side of the main body part 22 will be described, the attachment 20 is not limited to this position. Also, there are cases in which the attachment 20 is attached to the tip side of the arm 6 in a position in which the blade part 23 protrudes forward from the front part of the tip side of the main body part 22 that extends downward from the mounting part 21.

The mounting section 21 has a base plate 25 and a pair of connecting brackets 26 that are arranged to sandwich the tip end of the arm 6 from the left and right and are joined to the base plate 25 by welding. The main body section 22 is joined to this base plate 25 by welding, and the joints between the base plate 25, the pair of connecting brackets 26, and the main body section 22 are reinforced by welding a number of reinforcing brackets 27a to 27h. The pair of connecting brackets 26 each have two through holes 26a, 26b for inserting the connecting pins 10, 11.

The main body 22 is formed from rolled steel for welded construction into a rectangular thick plate with a vertical length of, for example, 800 mm, a front-to-rear length of, for example, 270 mm, and a left-to-right length (thickness) of, for example, 60 mm. The rear part of the main body 22 on the opposite side (tip side) to the mounting part 21 is formed into a triangular shape that protrudes rearward. A blade part 23 made of wear-resistant steel is joined to this triangular part by, for example, welding, and the blade part 23 protrudes rearward from the rear part of the tip side of the main body 22.

A curved plate-shaped fulcrum 24 is welded to the side of the main body 22 opposite the blade portion 23. The curved plate-shaped fulcrum 24 is made by bending part or all of a steel plate, for example 20 mm thick, into an arc shape. The curved plate-shaped fulcrum 24 is formed to smoothly connect from the tip 22a of the main body 22 to the tip front portion 22b, and extends a predetermined width on both sides in the left-right direction (the plate thickness direction of the main body 22) from the main body 22. The width of the curved plate-shaped fulcrum 24 is formed to become smaller as it approaches the blade portion 23.

The inner circumferential surface of the curved plate-like fulcrum 24 at both left and right ends (both sides in the thickness direction of the main body 22) is chamfered at an angle of, for example, 45° to form a single-edged edge. A number of reinforcing ribs are welded to the main body 22 and the curved plate-like fulcrum 24 to strengthen the connection.

The blade portion 23 has a cutting edge 23a formed at an acute angle, and a first pair of symmetrical blades 23b that extend linearly from the cutting edge 23a toward the vertical middle of the body portion 22, with the left-right center portion sharply formed. The blade portion 23 also has a second pair of symmetrical blades 23c that extend linearly from the cutting edge 23a toward the tip of the body portion 22, with the left-right center portion sharply formed. Therefore, the cutting edge 23a, where the first pair of blades 23b and the second pair of blades 23c converge to one point, is sharp.

As shown in FIG. 1, the attachment 20 is attached to the tip of the arm 6 by two connecting pins 10, 11 so that the mounting portion 21 is in a position in which the blade portion 23 protrudes rearward. When the bucket cylinder 9 is driven, the attachment 20 rotates via the link mechanism 6a on the tip of the arm 6, with the rear connecting pin 10 on the tip of the arm 6 as the rotation axis.

When treating a stump, as shown in Figure 5, the attachment 20 is tilted backwards, for example at a 45° angle, so that the blade 23 faces, for example, the stump 30. Then, in this position, for example, the arm 6 is moved to pierce the blade 23 into the side of the stump 30 below the ground 31. The blade 23 has a first double-edged blade 23b and a second double-edged blade 23c extending from the cutting edge 23a, so that the blade is less likely to deviate left or right when piercing, and can pierce straight. It is also possible to pierce the side of the stump 30 that is exposed above ground level, although in this case it is preferable to pierce the part close to the ground 31.

Next, as shown in Figure 6, the principle of leverage is used to bring the curved plate-shaped fulcrum portion 24 into contact with the ground 31, and the attachment portion 21, which is the point of force, is moved forward so as to tilt the attachment 20 forward, and the blade portion 23, which is the point of action, is moved upward. This allows the blade portion 23 to lift the stump 30 and pull it out of the ground 31, or cut the stump 30.

At this time, the curved plate-shaped fulcrum portion 24, which abuts against the ground 31 to serve as a fulcrum, sinks into the ground to some extent due to the load acting on the fulcrum and because the ground 31 is dug up by the blade portion 23. However, this load is distributed by the curved plate-shaped fulcrum portion 24 of a specified width, so that the curved plate-shaped fulcrum portion 24 is less likely to sink into the ground. This prevents the blade portion 23 from decreasing in the amount of upward movement, and the stump 30 can be easily pulled out or cut by the blade portion 23.

In addition, by cutting the roots of the stump 30 extending into the ground with the blade 23 in advance, the stump 30 can be easily pulled out. In this case, the blade 23 is thrust into the ground as in FIG. 5, and the blade 23 is moved upward using the principle of leverage as in FIG. 6. When thrusting, the first and second blades 23b and 23c cut the roots in the ground, and when the blade 23 is moved upward, the first blade 23b can cut or lift and expose the roots. At this time, the width of the curved plate-shaped fulcrum 24 becomes smaller as it approaches the blade 23, and the tip portions on both the left and right sides of the curved plate-shaped fulcrum 24 are each single-edged, so that the resistance received by the curved plate-shaped fulcrum 24 when thrusting is reduced, and the blade 23 can be thrust deeply.

On the other hand, by driving the boom 4 to move the attachment 20 to the left or right while it is tilted forward as shown in FIG. 6, the curved plate-shaped fulcrum 24 can excavate and scoop up soil. Since the tip of the curved plate-shaped fulcrum 24 on both the left and right sides is single-edged, soil can be easily excavated.

Even if the attachment 20 is attached in the opposite direction to the above, it is possible to easily process stumps and the like by utilizing the principle of leverage. In addition, a person skilled in the art can implement the above embodiment in various modified forms without departing from the spirit of the present invention, and the present invention also includes such modified forms.

1: Hydraulic excavator
2: hydraulic excavator body 3, 5, 10, 11: connecting pin 4: boom 6: arm 6a: link mechanism 7: boom cylinder 8: arm cylinder 9: bucket cylinder 13: lower travel unit 14: operator's room 15: upper rotating unit 20: attachment (hydraulic excavator attachment)
21: Mounting portion 22: Main body portion 23: Blade portion 23a: Blade tips 23b, 23c: First and second blades 24: Curved plate-shaped fulcrum portion

Claims (4)

A mounting part that is detachably mounted on the tip side of the arm of the hydraulic excavator;
A thick plate-shaped main body portion extending from the mounting portion;
a blade portion extending forward from a front end portion of the main body portion in a front-to-rear direction of the hydraulic excavator or extending rearward from a rear end portion of the front end portion of the main body portion and protruding from the main body portion;
a curved plate-like fulcrum portion formed in an arc shape so as to smoothly connect from the tip of the main body portion to a tip rear portion or a tip front portion on the opposite side to the blade portion, the curved plate-like fulcrum portion extending by a predetermined width on both sides in a plate thickness direction of the main body portion perpendicular to the front-rear direction;
1. An attachment for a hydraulic excavator comprising: The hydraulic excavator attachment according to claim 1, characterized in that the blade portion has a first double-edged blade extending from the cutting edge toward the middle of the main body portion, and a second double-edged blade extending from the cutting edge toward the tip side of the main body portion. The hydraulic excavator attachment according to claim 1, characterized in that the width of the curved plate-shaped fulcrum portion becomes smaller as it approaches the blade portion. The hydraulic excavator attachment according to claim 1, characterized in that the inner curved surface of the curved plate-shaped support part is chamfered at both ends in the thickness direction to form a single-edged shape.

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