JPH10237894A - Bucket with side cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow one operator to easily replace a side cutter mounted on the side plate of a bucket main body. SOLUTION: A bolt locking groove 30 is formed in the side plate of a bucket main body, the opposite wall surfaces of the bolt locking groove 30 serving as rectilinear walls 30a, 30b, and both ends of the groove 30 serving as circularly curved walls 30b, 30b, so that a bolt head 17a is completely buried in the bolt locking groove 30. The relation between the size of the outer form of the bolt head 17a and the size of the bolt locking groove 30 is such that when the greatest width between the corners of the hexagonal bolt head 17a is B and the shortest width between opposite sides is C, the interval D between the curved walls 30b, 30b is shorter than the greatest width B but greater than the shortest width C, so that when a nut is rotated to remove a through bolt for the replacement of a side cutter, the bolt head 17a does not rotate with it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bucket mounted on an excavating machine and used for performing operations such as excavation of earth and sand, and more particularly to a bucket for cutting an excavated portion into the ground. The present invention relates to a bucket with a side cutter in which a side cutter is detachably mounted on a side plate of a main body.

[0002]

2. Description of the Related Art An example of an excavating machine is a hydraulic excavator shown in FIG. In the drawing, reference numeral 1 denotes a lower traveling body having a crawler belt, and an upper revolving superstructure 3 is installed on the lower traveling body 1 via a revolving device 2 so as to be rotatable. A driver's cab 4, a front working mechanism 5, and the like are mounted on the upper swing body 3. The front working mechanism 5 includes a boom 6 provided on the upper swing body 3 so as to be capable of raising and lowering. Arm 7 movably connected, and arm 7
And a front attachment that is detachably attached to the tip of the
The bucket 8 is used as a front attachment.

FIG. 5 shows the structure of a bucket 8. The bucket body 9 of the bucket 8 is formed by connecting and fixing a bottom plate 11 between left and right side plates 10, 10.
1 has a substantially U-shaped cross section.
A housing part for earth and sand having a predetermined volume is formed by the base plates 0 and 10 and the bottom plate 11. A connecting portion 12 to the arm 7 is fixedly provided at one end of the both ends of the bottom plate 11 bent so as to rise. A predetermined number of bucket claws 13 are connected to the other end, and these bucket claws 13 project obliquely forward of the bucket body 9.

When the bucket 8 is lowered from above the excavation position, first, the bucket claws 13 bite into the ground and are dug to a predetermined depth. When the bucket 8 is rotated in the forward direction, the excavated earth and sand is scooped up, and the bucket 8 loaded with earth and sand is lifted by driving the boom 6 and the arm 7. Here, if the side plate 10 directly hits the ground after the bucket claw 13 bites into the ground, the excavation resistance increases, and so on. The side cutter 14 is attached to the site. The tip of this side cutter 14 is sharp,
The ground is cut in the stage before the side plate 10 of the bucket 8 directly hits the ground. As a result, the side plate 10 is protected, and, for example, in the case of digging a side ditch or the like, the side surface of the excavated portion has a stable shape such that the side surface is substantially linear.

[0005] The side cutter 14 cuts the ground when excavating earth and sand. Therefore, when excavation is repeatedly performed, abrasion and the like become severe. Therefore, the excavation must be replaced at an appropriate time. For this purpose, the side cutter 14
The structure of the mounting portion of the buckle 8 to the bucket 8 is as shown in FIGS. As is clear from the figure, the side cutter 14 is formed by connecting a sharp cutter portion 16 to the tip of a plate-shaped main body 15 and connecting the plate-shaped main body 15 to the side plate 1.
0 and is detachably connected by using a through bolt 19 including a bolt 17 and a nut 18.
As shown, a plurality of the through bolts 19 are attached to each of two rows. For this purpose, the side cutter 14 and the side plate 10 are provided with a plurality of bolt insertion holes 20 and 21 at corresponding locations. After the bolt 17 is inserted through the bolt insertion holes 20 and 21 and the washer 22 is inserted, the nut 18 is screwed and tightened.

Here, since the side cutter 14 has its cutter portion 16 bent outwardly, even if there is a projecting portion on its lower side, no particular problem occurs. It is arranged on the outer surface side of the plate-shaped main body 15.
Therefore, the bolt head 17a of the bolt 17 is located on the inner surface side of the side plate 10. If the bolt head 17a protrudes inward from the inner surface of the side plate 10, the excavation resistance increases by that much, and the shaft of the bolt 17 is increased. The portion 17b may be deformed. For this purpose, the side plate 10 has bolt insertion holes 21.
A round counterbore 23 having a diameter larger than the outer shape of the bolt head 17a is formed around the bolt head 17a so that the bolt head 17a is completely buried in the counterbore 23.
Further, a V-shaped locking recess 15 a is formed in the plate-shaped main body 15. When the side cutter 14 is connected to the side plate 10, the locking recess 15 a engages with the end surface of the side plate 10. Thus, the force acting on the side cutter 14 in the direction parallel to the side surface of the side plate 10 and the force rotating in the direction of arrow R are received, so that an excessive load is not applied to the bolt 17.

[0007]

Since the side cutter 14 is fixed to the side plate 10 by the through bolt 19, when the side cutter 14 is replaced, the through bolt 19 must be detached. For this purpose, as shown by a virtual line in FIG. 7, a tool 2 such as a torque wrench is attached to the bolt head 17a side and the nut 18 side.
4, 25 must be used. And bolt head 17a
In the state where the tool 24 is fitted to the nut 18 and the tool 25 is fitted to the nut 18, the other tool is rotated or both tools are rotated in the opposite direction while the one tool is stopped. As a result, the nut 18 is connected to the shaft 1 of the bolt 17.
Detach it by screwing it to 7b. Also,
Similarly, when installing a new side cutter,
The nut 18 is connected to the shaft 17b of the bolt 17 using 4, 25.
And tighten it.

As described above, when exchanging the side cutter 14, it is necessary to use two tools 24 and 25,
Moreover, in order to firmly fix the nut 18 to the bolt 17, it is necessary to apply a strong tightening force. For this reason, if the tightening work of the nut 18 is performed by one worker, a sufficient tightening force cannot be obtained, so that the tool 24
And the tool 25 need to be operated by different operators, and the replacement of the side cutter 14 needs to be performed by at least two operators, resulting in a problem of poor workability. Further, since a gap is formed between the counterbore portion 23 and the bolt head 17a, earth and sand will enter this gap when earth and sand is excavated. In addition, during repeated excavation, the sediment that has entered the gap may solidify and become stuck. In such a state, when exchanging the side cutter 14, the tool 24 is attached to the bolt head 17a.
Therefore, the earth and sand entering the counterbore 23 must be eliminated. However, since the earth and sand enters the gap between the bolt head 17a and the counterbore 23, and the width of the gap is often relatively narrow, it is extremely troublesome to remove the earth and sand from the entire circumference of the bolt head 17a. Become. In particular, if clay-type earth and sand enters the counterbore 23, its removal becomes more difficult.

The present invention has been made in view of the above points, and an object of the present invention is to enable a single operator to easily replace a side cutter.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a method for cutting a ground into the outer surface of left and right side plates constituting a bucket body having a predetermined volume. The sharpened side cutter is attached, and it is fixed detachably with through bolts,
A bolt fixing groove having a regulating wall for regulating the rotation of the bolt is provided on the inner surface of the side plate of the bucket body so as to abut against an opposing flat surface on the side surface of the bolt head of the bolt. The feature is.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. Thus, in the drawing,
FIG. 1 shows a configuration of a mounting portion of a side cutter in a bucket body, and FIG. 2 shows a cross section taken along line XX of FIG. further,
FIG. 3 is an explanatory diagram showing a dimensional relationship between a bolt head and a bolt fixing groove. In the following description, the same or equivalent members as those of the above-described related art are denoted by the same reference numerals,
The description is omitted.

First, as shown in FIG. 1, a side cutter 13 is detachably fixed to a side plate 10 of a bucket 8 with a plurality of through bolts 19. Further, as shown in FIG. 2, the side cutter 13 is brought into contact with the outer surface of the side plate 10, the bolt 17 is inserted through the bolt insertion holes 20, 21, and the nut 18 is screwed and tightened for connection. Fixed to state. The bolt 17 is a hexagonal bolt,
The bolt head 17a is located on the inner side of the side plate 10, and the nut 18 is located on the side cutter 13 side. The above configuration is not particularly different from the prior art.

A bolt fixing groove 30 for receiving a bolt head 17a is provided on the inner surface of the side plate 10 in order to hold the bolt 17 from the side plate 10 so as not to protrude inward. The bolt fixing groove 30 has the shape shown in FIG. That is, the bolt fixing groove 30 has straight walls 30a, 30a on opposite wall surfaces, and curved walls 30b, 30b curved in an arc shape at both ends. Here, straight wall 30a, the distance between 30a is D, also L ₁ to a length of the transition from the straight wall 30a to the curved wall 30b, 30b,
When curved wall 30b, the length between the most extended parts of 30b and L _2, at least the length L ₂ is longer than the distance D, therefore as a whole has a long groove shape.

The bolt head 17a of the bolt 17 is accommodated in the bolt fixing groove 30, so that the depth of the bolt fixing groove 30 is larger than the thickness of the bolt head 17a. For this reason, the bolt head 17a is completely buried in the bolt fixing groove 30. The relationship between the outer dimensions of the bolt head 17a and the dimensions of the bolt fixing groove 30 is as follows. Here, since the bolt head 17a has a hexagonal shape, in the width direction, the longest portion is the width B between the opposed corner corners, and the shortest portion is the width C between the opposed sides. Becomes Therefore, at least the interval D between the straight walls 30a is smaller than the longest width B of the bolt head 17a and larger than the shortest width C. In addition, the interval D has a dimension as close as possible to the shortest width C. The length L ₁ of the straight wall 30a is at least bolt head 1
7a is longer than the length of each side.

With the above construction, the shaft 17b of the bolt 17 is inserted into the bolt insertion hole 21 of the side plate 10, and the bolt insertion hole 20 formed in the plate-shaped main body 15 of the side cutter 14 is inserted into this bolt. The side cutter 14 is fixedly attached to the side plate 10 of the bucket body 9 by inserting the nut 18 into the shaft portion 17 b of the bucket 17 and screwing and tightening the nut 18. Here, the nut 18 is tightened
Although this is performed using the tool 25, it is not necessary to use a special tool on the bolt head 17 side. That is, the nut 18 is tightened with the bolt head 17a housed in the bolt fixing groove 30. Here, since the distance D between the straight walls 30a, 30a of the bolt fixing groove 30 is smaller than the longest width B of the bolt head 17a, when the nut 18 is rotated by the tool 25, the bolt head 17a rotates. Although there is a possibility of slight movement in the direction, at least after the opposing corners or the vicinity thereof come into contact with the straight walls 30a, 30a, the corners are regulated by the straight walls 30a, 30a,
No more rotation. Accordingly, the straight wall 30a of the bolt fixing groove 30 exhibits a rotation preventing function for preventing the bolt head 17a from rotating together, and can be tightened only by rotating the nut 18 side.

As described above, no jig is required to prevent the bolt head 17a from rotating together. This is because soil and the like enter the bolt fixing groove 30 so as to surround the bolt head 17a. Even if it is stuck, the bolt 19 can be removed without removing the earth and sand in advance. And
If the through bolt 19 is removed, the portion where the bolt head 17a is located becomes an empty space even if earth and sand are fixed in the bolt fixing groove 30. Therefore, the earth and sand can be easily removed by scraping the earth and sand from the space, and at least the space where the bolt head 17a is mounted is a space where the earth and sand are not accumulated.
When mounting the bolt, the bolt head 17a of the bolt 17 of the through bolt 19 may be accommodated in this space, so that the earth and sand in the bolt fixing groove 30 does not necessarily have to be removed.

As described above, the side cutter 14 is fixed to the side plate 10 of the bucket body 9 by the through bolt 19. When excavating earth and sand by the bucket 8, when the side cutter 14 comes into contact with the ground. Depending on the condition of the ground, an extremely large impact load may act. Therefore, if the nut 18 is not strongly tightened, the through bolt 19 may be loosened and fall off. Therefore, when the nut 18 is tightened, an extremely large pressing force acts on the straight wall 30a, which is a contact portion of the bolt head 17a with the bolt fixing groove 30. Therefore, it is necessary to hold the straight wall 30a so as not to be deformed or damaged by the pressing force of the bolt head 17a.

Since the bolt head 17a has a hexagonal shape, if its corner is in contact with the straight wall 30a, it will be in a substantially line contact state, and the pressing force will be extremely large. The detent function of the head 17a cannot be stably exhibited. On the other hand, bolt head 17a
When the opposing sides of the straight line abut on the straight wall 30a, no local pressing force acts on the straight wall 30a, so that the surface pressure is reduced and damage to the straight wall 30a can be prevented. At the time of tightening, the bolt head 17a does not move at all, so that the anti-rotation function is maximized. From the above, the distance D between the straight walls 30a, 30a
It is most advantageous from a functional point of view that the shortest width C is equal to the shortest width C of the bolt head 17a. However, there is a case where the bolt head 17a cannot be accommodated in the bolt fixing groove 30 due to a slight variation in the groove processing accuracy of the bolt fixing groove 30 and the dimensional accuracy of the bolt head 17a. Therefore, the difference in dimension between the interval D and the shortest width C is determined by the bolt fixing groove 30 and the bolt head 17.
It is set to be equal to or slightly larger than the dimensional error of a. Here, since the bolt head 17a is formed by die casting, it can be formed with extremely high precision and has a small dimensional tolerance. Further, the bolt fixing groove 30 is processed by, for example, a reaming process, etc. Becomes possible.
Therefore, the dimensional difference between the interval D and the shortest width C can be considerably reduced. As a result, when the nut 18 is tightened, the bolt head 17a may not completely come into surface contact with the straight wall 30a of the bolt fixing groove 30; Also, the bolt fixing groove 30
Considering the depth of the material and the material strength of the side plate 10, the nut 18
Can be prevented from being damaged or deformed by the pressing force of the bolt head 17a.

The external shape of the bolt head of the through bolt described above is hexagonal. However, if it is other than a perfect circle and flat surfaces facing each other are formed, for example, a square or a chamfer may be used. Any shape, such as a circle provided with a portion, can be used.

[0020]

As described above, in the present invention, since the restricting wall for restricting the rotation of the bolt head is provided in the bolt fixing groove formed in the side plate, the bolt head rotates together when tightening the nut. This can be reliably prevented by the restricting wall, and an effect such that replacement of the side cutter or the like can be performed extremely easily by one operator can be achieved.

[Brief description of the drawings]

FIG. 1 is an external view of a mounting portion of a side cutter in a bucket body.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is an explanatory diagram showing a dimensional relationship between a bolt head and a bolt fixing groove.

FIG. 4 is an external view of a hydraulic excavator as an example of an excavating machine equipped with a bucket.

FIG. 5 is a plan view of a conventional bucket.

FIG. 6 is a sectional view taken along line YY of FIG. 5;

FIG. 7 is a sectional view taken along the line ZZ of FIG. 6;

[Explanation of symbols]

Reference Signs List 5 front working mechanism 8 bucket 9 bucket body 10 side plate 11 bottom plate 14 side cutter 15 plate-like body 17 bolt 17a bolt head 18 nut 19 through bolt 30 bolt fixing groove 30a straight wall

Claims (1)

[Claims] 1. A side cutter having a sharpened tip is mounted on the outer surface side of left and right side plates constituting a bucket body having a predetermined capacity, and is detachable by a through bolt. A bolt provided with a regulating wall that regulates rotation of the bolt by abutting an inner flat surface of the side plate of the bucket body with an opposing flat surface on a side surface of a bolt head of the bolt. A bucket with a side cutter, wherein a fixing groove is provided in a recessed manner.