JP2004183396A - Breakage prevention structure of non-abrasive plate for bucket cutting edge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a breakage prevention structure of a non-abrasive plate for a bucket cutting edge, which prevents breakage of the non-abrasive plate due to falling rocks. <P>SOLUTION: The bucket cutting edge 10 has breakage prevention members firmly welded thereto so as to have a height H1 higher than the height H of a mounting portion 25 of each of the non-abrasive plates 13, 14, 15. A rear portion of the breakage prevention member is formed like a slope surface extending in a lower backward direction. Further the breakage prevention member has a width W1 which is larger than the width W of a thin-wall portion of the mounting portion of the non-abrasive plate. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a structure for preventing damage to a wear-preventing plate of a bucket cutting edge.
[0002]
[Prior art]
Earthmoving machines, such as scrapers, bulldozers, wheel shovels, hydraulic shovels, and the like, include cutting blades for excavating soil. When the cutting blade is worn, the excavating performance is deteriorated, and it is necessary to replace the cutting blade. The cutting blade is replaceably mounted on an earthworking device such as a blade or a bucket.
[0003]
For example, Patent Document 1 discloses a cutting blade device in which a cutting blade can be quickly replaced by a mechanical lock device. Patent Document 2 discloses a cutting blade device in which a cutting blade is exchangeably attached to an adapter, and the adapter is exchangeably attached to a bucket which is an earthworking device.
[0004]
Further, as shown in FIG. 4 which is a plan view of a conventional cutting edge portion, a bucket (not shown) which is an earthworking device is provided with a cutting edge 10, and the cutting edge 10 is provided with a plurality of cutting blades 11 and 12. Have been. Further, wear preventing plates 13, 14, 15 for preventing abrasion of the cutting edge 10 between the plurality of cutting blades 11, 12 are provided so as to be replaceable.
[0005]
As shown in FIG. 5, which is a cross-sectional view taken along the line AA in FIG. 4, the wear prevention plates 13, 14, 15 are provided with a mounting portion 25 extending rearward at the rear upper portion in the longitudinal direction. Although the tip portions of the wear prevention plates 13, 14, and 15 are different from each other, the shape and structure of the mounting portions 25 of the wear prevention plates 13, 14, and 15 are the same. The mounting portions 25 of the wear prevention plates 13, 14, 15 are provided with mounting grooves 24a, 24b, which are inserted into the flanges 21T of the boss 21 fixed to the cutting edge 10. Then, the retaining pin 22 is fitted into the pin hole 23 of the mounting portion 25 of the abrasion preventing plates 13, 14, 15, and the abrasion preventing plates 13, 14, 15 are brought into contact with the boss 21 by the retaining pin 22. It is attached so as not to come off the cutting edge 10. An elastic material (not shown) is incorporated in the retaining pin 22, and the retaining pin 22 is engaged with a concave portion (not shown) of the pin hole 23 so that the retaining pin 22 does not come out of the pin hole 23.
[0006]
As shown in FIG. 6 which is a cross-sectional view taken along the line BB of FIG. 4, the mounting portions 25 of the wear prevention plates 13, 14, 15 are provided with mounting grooves 24a, 24b with the flange 21T of the boss 21, so that The width W of the central upper portion 26 in the width direction of the portion 25 is thin. The abrasion of the cutting edge 10 is prevented by the abrasion prevention plates 13, 14, 15. If the abrasion prevention plates 13, 14, 15 are worn out, an elastic member (not shown) of the retaining pin 22 is removed, and the abrasion prevention plate 13 is removed. , 14 and 15 may be replaced.
[0007]
[Patent Document 1]
Japanese Patent Publication No. 52-19001 (Page 1, Figure 2)
[0008]
[Problems to be solved by the invention]
However, when excavation work is performed by the bucket, the rock falls and hits the mounting portion 25 of the wear prevention plates 13, 14, and 15. As shown in FIG. 6, the widthwise central upper portion 26 of the rear portion of the mounting portion 25 of the wear prevention plates 13, 14, 15 is thinner at the width W, and the lower portion of this portion is a hollow portion. Therefore, if a rock falls on the thin central upper portion 26, the central upper portion 26 is broken by an impact, and a crack 26K is generated.
[0009]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a structure for preventing the abrasion prevention plate of the bucket cutting edge from being damaged due to falling rocks of the abrasion prevention plate.
[0010]
Means for Solving the Problems, Functions and Effects
In order to achieve the above object, a first aspect of the present invention provides a structure for preventing abrasion of a wear prevention plate of a bucket cutting edge, wherein a damage prevention member having a height higher than a height of a mounting portion of the wear prevention plate is provided on the cutting edge. Configuration.
[0011]
According to the first invention, excavation work is performed by the bucket, and even if there is rockfall, the rockfall hits the upper surface of the damage prevention member that is higher than the height of the mounting portion of the wear prevention plate, and directly at the upper center in the width direction of the mounting portion. Since the thin portion does not hit the thin portion, the thin portion at the upper center in the width direction of the mounting portion is not damaged, and the durability of the wear prevention plate is improved.
[0012]
According to a second aspect, in the first aspect, the damage prevention member is fixed to the cutting edge by welding.
[0013]
According to the second aspect, the damage prevention member is fixed to the cutting edge by welding, so that the damage prevention member can be easily attached to the cutting edge.
[0014]
According to a third aspect of the present invention, in any one of the first, second, and second aspects, the rear surface of the breakage prevention member is provided with an inclined surface facing rearward and downward.
[0015]
According to the third aspect of the present invention, since a downwardly inclined surface is provided at the rear portion of the breakage prevention member, it is possible to smoothly discharge the earth and sand loaded in the bucket from the bucket without causing resistance, and In addition, the earth and sand do not catch on the damage prevention member, and the earth and sand do not remain in the bucket.
[0016]
According to a fourth aspect of the present invention, in any one of the first, second, and third aspects, the width of the breakage prevention member is wider than the width of the thin portion of the mounting portion of the wear prevention plate. .
[0017]
According to the fourth aspect, the width of the damage prevention member is made wider than the width of the thin portion of the mounting portion of the abrasion prevention plate. Covers and protects the width of the part.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a structure for preventing breakage of a wear prevention plate of a bucket cutting edge according to the present invention will be described with reference to the drawings. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof is omitted.
[0019]
As shown in FIG. 1 which is a plan view of a portion of the cutting edge 10 which is a bucket cutting edge, the cutting edge 10 is provided with a plurality of cutting edges 11 and 12. Further, wear preventing plates 13, 14, 15 for preventing abrasion of the cutting edge 10 between the plurality of cutting blades 11, 12 are provided so as to be replaceable.
[0020]
Guard bars 31 are provided behind the wear prevention plates 13, 14, 15 as damage prevention members for preventing the wear prevention plates 13, 14, 15 from being damaged by falling rocks.
[0021]
The guard bar 31 is fixed to the cutting edge 10 by welding as shown in FIG. The height H1 of the upper surface 31U of the guard bar 31 is set to be higher than the height H of the mounting portion 26 of the wear prevention plates 13, 14, 15 by a predetermined height, for example, 10 mm. Further, a chamfered portion 31C is provided in which the rear upper portion of the guard bar 31 is inclined rearward and downward to form a downwardly inclined surface.
[0022]
As shown in FIG. 3 which is a cross-sectional view taken along the line B1B1 in FIG. 1, the width W1 of the guard bar 31 is larger than the width W of the thin portion of the central upper portion 26 in the width direction of the mounting portion 26 of the wear prevention plates 13, 14, 15. , For example, 1.5 times the width W.
[0023]
Therefore, excavation work is performed by a bucket (not shown), and even if there is rockfall, the rockfall hits the upper surface 31U of the guard bar 31 and does not directly hit the thin portion of the central upper portion 26 in the width direction of the mounting portion 26. The thin portion of the central upper portion 26 in the width direction is not damaged, and the durability of the wear prevention plates 13, 14, 15 is improved. Further, the width W1 of the guard bar 31 is set to be larger than the width W of the thin portion of the central upper portion 26 in the width direction of the mounting portion 26 of the wear prevention plates 13, 14, 15, so that even if rock falls, wear is prevented. The width W of the thin portion of the mounting portion 26 of the plates 13, 14, 15 can be sufficiently covered and protected.
[0024]
Further, a chamfered portion 31C is provided at the upper rear portion of the guard bar 31, so that it is possible to smoothly discharge the soil and the like loaded in a bucket (not shown) from the bucket without causing any resistance when discharging the soil and the like. There is no earth and sand remaining in a bucket (not shown) without being caught by the guard bar 31, and further, the rear upper corner of the guard bar 31 is not worn or damaged by earth and sand.
[0025]
Since the guard bar 31 is fixed to the cutting edge 10 by welding, it can be easily attached to the cutting edge 10. Further, even in the cutting edge 10 where the guard bar 31 is not provided, the guard bar 31 can be easily added later by welding.
[0026]
Further, the guard bar 31 may not be fixed by welding the cutting edge 10 but may be formed integrally with the cutting edge 10 as necessary. This saves welding time and further improves productivity.
[Brief description of the drawings]
FIG. 1 is a plan view of a cutting edge portion.
FIG. 2 is a sectional view taken along line A1A1 of FIG.
FIG. 3 is a sectional view taken along the line B1B1 of FIG. 1;
FIG. 4 is a plan view of a conventional cutting edge.
FIG. 5 is a sectional view taken along the line AA in FIG. 4;
FIG. 6 is a sectional view taken along the line BB of FIG. 4;
[Explanation of symbols]
10: Cutting edge, 13, 14, 15: Wear prevention plate, 25: Mounting part, 26: Upper center, 31: Guard bar, 31C: Chamfered part, H, H1: Height, W, W1: Width.

Claims (4)

In the structure for preventing the abrasion prevention plate of the bucket cutting edge from being damaged, a breakage prevention member having a height (H1) higher than the height (H) of the mounting portion (25) of the abrasion prevention plate (13, 14, 15) is cut. A structure for preventing damage to a wear-preventing plate of a bucket cutting edge, the structure being provided on an edge (10). The structure for preventing abrasion of a cutting edge of a bucket cutting edge according to claim 1, wherein the damage preventing member is fixed to the cutting edge (10) by welding. The structure for preventing damage to the abrasion preventing plate of the bucket cutting edge according to claim 1, wherein an inclined surface facing rearward and downward is provided at a rear portion of the damage preventing member. The width (W1) of the breakage prevention member is wider than the width (W) of the thin portion of the mounting portion of the wear prevention plate. The structure for preventing damage to the abrasion preventing plate of the bucket cutting edge described in the above item.

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