JP2001040692A - Construction of blade of construction machine installed with cutting edge with doglegged cross section performing grading work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and definitely confirm the state of abrasion from the front of a blade by sticking and containing a cutting edge having a doglegged cross section to the bottom plate portion of a blade-reinforcing member and also to the back portion of the blade front face plate. SOLUTION: To the rear face of a blade front face plate 1, a blade reinforcing member 2 is attached with a weld portion 3 and a blade is constituted. A bolt hole 22 is provided at the bottom plate portion 24 of the blade reinforcing member 2, and a nut 6 is attached there by welding. The cutting edge 8 is made a doglegged cross section by bending a flat plate having a width as same as the length of the blade and is provided with a bolt hole 82. The cutting edge 8 is stuck and contacted to the rear surface of the blade front face plate 1 and is attached by inserting the bolt 5. In this way, when the wear reaches the line B, the replacement time for the cutting edge 8 can be easily confirmed by visually seeing the blade from the front face by the operator. Thus, damages to the blade front face plate or pitting in the blade reinforcing member can be easily prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large construction machine such as a bulldozer or a grader for leveling work using a work attachment having a blade, and a small construction machine having a shovel front attachment and a blade. The present invention relates to a blade attached to a machine or the like.

[0002]

2. Description of the Related Art Various types of work are often performed outdoors in construction sites, depending on the season, such as work under the scorching sun or work in the cold. Because it is not so beautiful, it is very difficult to secure workers to perform this task as compared to other occupations. For this reason, chronic labor shortages continue, but on the other hand, shortening of construction delivery time and strict adherence to delivery time are strictly required. In order to respond to both, labor saving and efficiency of work are achieved, and mechanization using many construction machines is being promoted. On the other hand, at work sites where relatively small-scale civil engineering work is performed, for example, road surface excavation or gutter excavation, it is necessary to promote labor-saving and efficient work to shorten the construction period. From this small-scale work site, a single-function small construction machine, for example, a hydraulic mini excavator for excavation of a ditch or a gutter, and backfilling and leveling of earth and sand in the excavated ditch or a gutter Work machines, such as small bulldozers, have been introduced for work, but these work machines are complicated at narrow work sites.

[0003] Therefore, in order to use one small construction machine as a multifunctional work machine, one end of a push arm can be swung up and down in front of or behind a traveling truck of a small construction machine such as a mini excavator. At the other end of this arm, a blade for backfilling and leveling of earth and sand is attached, and a bucket, which is a front attachment, is used to excavate a road surface, a groove or a gutter, and the excavated soil is excavated. In order to backfill the trench, the blade is mounted on a mini-excavator, and the soil is excavated with a blade for leveling work.

[0004] In the leveling operation and excavation loading operation, when the earth and sand is pushed by a blade mounted on a traveling vehicle of a construction machine, the blade has a rigidity for pushing and conveying the earth and sand. The lower end, in particular, has less wear resistance to earth and sand, so if the lower end of the blade is worn and damaged by earth and sand, the blade must be repaired or replaced. As described above, repairing or replacing the blade every time it is worn and damaged requires time and cost for repair and replacement work, which is disliked by users.

[0005] The conventional blade will be described by taking a bulldozer blade as a leveling machine as an example. As shown in Fig. 7, the blade is composed of a blade front plate 1, a blade reinforcing member 2, and a cutting edge 4. I have. On the back surface of the curved blade-shaped front plate 1 constituting the blade, for excavation and pushing of earth and sand, for example, a substantially semi-arc-shaped cross section or a substantially U-shaped cross section for imparting rigidity to the blade in order to prevent deformation and rigidity of the blade. The blade reinforcing member 2 having the shape of a blade is welded and mounted above the lower end of the blade front plate 1 so that the lower portion of the blade front plate 1 projects further below the lower side of the blade reinforcing member 2. The front end of a push arm (d) whose one end is pivotally supported on the traveling trolley of the construction machine so as to be able to swing up and down is welded to the back surface of the blade reinforcing member 2.

[0006] At the lower end of the front surface of the blade front plate 1 constituting the blade, a plate-shaped straight cutting edge which is a cutting member of a separate member having a friction strength between the blade front plate 1 and the soil front sand from the blade front plate 1. 4 can be attached with bolts 5. Attachment of the cutting edge 4 to the front surface of the lower end of the blade front plate 1 is provided at the bolt hole 12 and the cutting edge 4 provided at the lower end of the blade front plate 1 so as to protrude from the lower end of the blade front plate 1. The bolt holes are aligned with the bolt holes 42, the bolts 5 are inserted into the bolt holes 12, 42, and the nut 6 previously attached to the back surface of the blade front plate 1 with the welding portion 7.
Screw the bolt 5 to 1 and install. The cutting edge 4 attached to the front surface of the lower end of the blade front plate 1 excavates earth and sand while contacting the ground surface GL, and pushes the soil with the blade front plate 1 to backfill the excavation trench with the earth and sand. And leveling work.

The straight cutting edge 4 protruding from the lower end of the blade front plate 1 pushes the earth and sand in contact with the ground surface GL, so that the lower end of the blade front plate 1 is worn instead of being worn. Since the cutting edge 4 is worn, it is possible to prevent the blade from being worn and damaged. When the cutting edge 4 is worn to a certain position by backfilling or leveling the soil, the bolts 5 are removed, and the worn cutting edge 4 is replaced with a new cutting edge 4 and then backfilled with the soil again. And leveling work. FIG. 8 shows a state of wear of the blade front plate 1 and the cutting edge 4 shown in FIG. 7, in which holes are formed by abrasion of the blade, and numerals 11, 21, and 41 are worn down by abrasion. A hole is formed between the lower end of the front plate 1 and the bottom plate of the blade reinforcing member.

Japanese Patent Application Laid-Open No. H10-60955 discloses that a bolt hole for attaching a cutting edge, which is attached to a lower portion of the front surface of a blade front plate, to a blade is a vertically long hole, and the bolt hole is appropriately formed according to wear of the cutting edge due to work. The cutting edge of a blade in a construction machine which is used for a long period of time by extending the cutting edge by shifting the mounting position downward, reducing the frequency of replacement of the cutting edge, and preventing the blade from being worn directly. (See Japanese Patent Application Laid-Open No. 10-60955).

[0009]

However, in the above-described apparatus for mounting a cutting edge of a blade in a conventionally known construction machine, the straight cutting edge 4 mounted on the front surface of the blade front plate 1 is used for a long time.
When performing leveling work and excavation and loading work of earth and sand, it gradually wears out, and finally, not only wear of the straight cutting edge 4, but also the blade front plate 1, the welded portion 3,
As shown in FIG. 8, the blade reinforcing member 2 is worn down,
In some cases, a hole is opened in the bottom of the blade, and the entire blade must be replaced not only for repair.

In order to avoid such replacement due to wear of the blade, the cutting edge 4 can be prevented by replacing the cutting edge 4 with a new one before the welding portion 3 or the blade reinforcing member 2 is worn. The determination as to whether or not the wear of the cutting edge 4 attached to the lower part of the front of the blade 1 is in a state to be replaced is performed by the blade
Since the cutting edge 4 is mounted on the front surface of the blade, it is not possible to accurately confirm the state of wear of the blade only from the front of the blade.

For this reason, the length of the cutting edge 4 is measured with a ruler before and after the work, or the blade front plate 1 and the blade reinforcing member 2 are welded from below with the entire blade raised upward. There is no choice but to look directly into the area around the part 3 and directly observe the state of wear, which also tends to be troublesome. Therefore, in practice, the replacement time is missed and the lower end of the blade front plate 1 and the blade reinforcing member 2 are removed.
In many cases, a hole is formed between the blade and the bottom plate, and the blade is worn until the blade is replaced.

In view of the above, the present invention has been made in view of the above-mentioned problem, and before the blade is replaced by abrasion caused by abrasion due to the leveling of excavated earth and sand and the pushing operation, the blade is visually observed from the front of the blade. When the wear of the cutting edge has advanced to the lower end position of the front plate, the cutting edge is replaced, and the worn cutting edge is removed and replaced with a new cutting edge. In this replacement time, since the wear is only on the cutting edge, the time and cost for replacement can be reduced, and the wear state of the cutting edge can be easily and reliably checked from the front of the blade. It is also possible to determine at a glance when to replace the cutting edge, to prompt the operator of the work machine to replace the cutting edge, and further, when the cutting edge is bolted to the blade reinforcing member, this cutting Even if you do not notice when it is time to replace the edge, the head of the bolt that attaches the cutting edge to the bottom plate of the blade reinforcing member will wear, and the head of the bolt will come off from the root position, and the cutting edge will reinforce the blade Because it falls off from the member,
At that point, the operator immediately stops the work, and can prevent damage due to wear of the blade reinforcing member and damage to a weld between the blade front plate and the blade reinforcing member. It is an object of the present invention to provide a blade structure of a construction machine in which a hole is prevented from being opened between a lower end portion and a bottom plate portion of a blade reinforcing member.

[0013]

In order to achieve the above object, the invention according to claim 1 of the present invention is directed to a construction machine for performing leveling work using a work attachment having a blade, wherein the blade is A blade reinforcing member is attached to the back surface of the blade front plate, and the lower surface of the bottom plate portion of the blade reinforcing member and the back surface of the blade front plate are brought into contact with the outer upper surface and the outer front surface of the cutting edge having a cross-shaped U shape. It is characterized in that it is configured to be attached by mounting. Further, in order to achieve the above object, the invention according to claim 2 of the present invention is characterized in that the cutting edge having a U-shaped cross section is attached to the blade reinforcing member by fastening means. It is.

According to a third aspect of the present invention, in order to achieve the above object, a cutting edge having a U-shaped cross section is connected to welding means on a blade front plate and a blade reinforcing member, respectively. It is characterized by being attached by means. In order to achieve the above object, the invention according to claim 4 of the present invention is characterized in that the cutting edge having a U-shaped cross section is attached to the blade front plate and the blade reinforcing member by welding means. It is characterized by the following. In order to achieve the above object, the invention according to claims 5 and 6 of the present invention is characterized in that the construction machine is one of a bulldozer and a grader. Also, to achieve the above objectives,
The invention described in claim 7 of the present invention is a small-sized construction machine having a shovel-based front attachment and a blade.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view of a construction machine according to the present invention, and FIG. FIG. 3 is a perspective view showing a first embodiment of the present invention. FIG. 3 is a cross-sectional view in which a V-shaped cutting edge is attached to a bottom plate of a blade reinforcing member by a bolt. FIG. 5 is a sectional view showing a worn state of the blade shown in FIG. 3, and FIG. 5 is a sectional view showing a second embodiment of the present invention. FIG. 6 is a sectional view showing a third embodiment of the present invention, in which a cutting edge having a U-shaped cutting edge is attached. The sectional shape of the blade reinforcing member is welded to the bottom plate and the front plate of the blade. Attached cutting edge It is a surface view.

Here, the attachment of the cutting edge 8 having a U-shaped cross section to the blade will be described with reference to FIGS. 1, 2, 3, and 4 for a first embodiment using bolts. (A) is a small construction machine called a mini-excavator having a shovel-based front attachment (b) and a blade (c).
(D) is a push arm pivotally supported at one end on a traveling cart of a construction machine so as to be vertically swingable. Reference numeral 1 denotes a blade front plate, which is attached to the tip of a push arm (d) pivotally supported at one end by a traveling cart of the construction machine. When the construction machine travels to the left in FIG. The cutting edge 8 attached to the lower end of the blade front plate 1 cuts the ground and excavates. At this time, the excavated earth and sand is pushed in front of the curved blade front plate 1 in the traveling direction of the construction machine. I do. And this blade front plate 1
For example, a blade reinforcing member 2 having a semicircular cross section or a substantially U-shaped cross section for reinforcing the rigidity of the blade front plate 1 or preventing deformation thereof is attached to a back surface of the blade front plate 1 by a welded portion 3. A blade (c) is configured. The bottom plate 24 of the blade reinforcing member 2 is provided with a bolt hole 22, and the nut 6 is attached to the upper surface 23 of the bottom plate 24 of the blade reinforcing member by welding in accordance with the position of the bolt hole 22. I have.

As shown in FIG. 2, the cutting edge 8 is bent from the central longitudinal axis of a flat plate having a required thickness and the same width as the blade (c) to be mounted so as to have a U-shaped cross section. A bent surface having a U-shaped cross section has a bolt hole 82, and an outer upper surface having the bolt hole 82 is provided on the cutting edge 8 in contact with the bottom plate 24 of the blade reinforcing member 2. The bolt hole 82 and the bolt hole 22 provided in the bottom plate portion 24 of the blade reinforcing member 2 are aligned, and the bolt 5 is inserted into the bolt hole 82 and the tip of the bolt 5 is attached to the upper surface 23 of the bottom plate portion 24 of the blade reinforcing member 2. A cutting edge 8 having a U-shaped cross section is screwed to the nut 6 and attached to the bottom plate 24 of the blade reinforcing member 2.

The other outer front surface of the cutting edge 8 having a U-shaped cutting edge 8 having no bolt hole 82 is in contact with the back surface of the blade front plate 1 and at the lowermost position of the blade front plate 1. The blade reinforcing member 2 is attached to the bottom plate 24 so as to protrude downward from the B line. In FIG. 3, GL is the ground surface.

Next, the bottom plate 24 of the blade reinforcing member 2 is protruded from the lower end of the blade front plate 1 as described above.
A cutting edge 8 having a U-shaped cross section is attached to a small construction machine to perform excavation of earth and sand for leveling work. When backfilling or leveling the earth and sand with the blade configured as described above for a long time, the cutting edge 8 having a cross-sectional C-shape protruding from the lower end of the blade front plate 1 becomes in contact with the earth and sand. It gradually wears out due to contact.

As shown in FIG. 4, the portion 81 which has disappeared due to the abrasion of the cutting edge 8 in the shape of a cross section has been removed only by the abrasion of the cutting edge 8 until the line B which is the lowermost position of the blade front plate 1. is there. Therefore, when the wear proceeds to the B-line, which is the lowermost position of the blade front plate 1, if the cutting edge 8 having a U-shaped cross section is replaced with a new cutting edge, the wear of the blade body due to earth and sand excavation can be achieved. No damage at all.

When the operator visually observes the blade from the front surface in a state where the abrasion due to the backfilling of the earth and sand or the leveling operation reaches the B line which is the lowermost position of the blade front plate 1, the cutting edge 8 becomes Since the blade is just hidden by the blade front plate 1 and cannot be seen, it is possible to confirm at a glance that the cutting edge 8 needs to be replaced at a glance unlike the case where the blade is raised upward and the blade is viewed from below. In this case, the worn cutting edge 8 attached to the bottom plate portion 24 of the blade reinforcing member 2 is easily removed from the bottom plate portion 24 of the blade reinforcing member 2 by releasing the screwing relationship between the bolt 5 and the nut 6. In addition, a new cutting edge 8 is attached to the bottom plate 24 of the blade reinforcing member 2 by the bolt 5, and the next backfilling and leveling work is performed.

Further, if the wear of the cutting edge 8 is further continued after the wear reaches the B line which is the lowermost position of the blade front plate 1, the cutting edge 8 and the blade front plate 1 As the wear progresses and the wear progresses to the A line which is the position of the root 51 of the bolt head of the bolt 5, the cutting edge 8 comes off from the bolt 5 because the bolt head of the bolt 5 disappears. The operator can be prompted to replace the cutting edge 8 before the fall of the cutting edge 8 causes a hole due to wear in the bottom plate portion 24 of the blade reinforcing member 2.

Next, with reference to FIG. 5, a description will be given of a second embodiment in which the cutting edge 8 having a U-shaped cross section is attached to the blade by using both bolts and welding. In the leveling operation, if the load applied to the cutting edge 8 having the cross-sectional shape of the letter “C” attached to the bottom plate portion 24 of the blade reinforcing member 2 is not large, as in the embodiment shown in FIG. The edge 8 may be cantilevered to the bottom plate portion 24 of the blade reinforcing member 2 by the bolt 5, but a load applied to the cutting edge 8 is relatively large, and only one surface of the cutting edge 8 is attached to the bottom plate portion 24 of the blade reinforcing member 2. In the case where the bolt 5 alone cannot cope with the above, as shown in FIG.
The outer upper surface having the bolt holes 82
The nut 6 is inserted into the bolt holes 22 and 24 formed in the bottom plate portion 24, and the bolt 5 is inserted into the nut plate 6 and the tip of the bolt 5 is attached to the upper surface 23 of the blade reinforcing member 2.
And the cutting edge 8 is welded to the end of the blade front plate 1 where the other outer front surface of the cutting edge 8 is in contact with the lower back surface below the blade front plate 1. It is also possible to make the attachment.

In the case of using the welding and the bolt together,
It is easy for the operator to visually observe from the front of the blade that the wear of the cutting edge 8 has progressed to the B line, which is the lower end of the blade front plate 1, due to the backfilling of the earth and sand and the leveling work for a long time. Since it can be confirmed, at that time, the bolt 5 is removed, the cutting edge 8 is removed, and the cutting edge 8 is replaced with a new one. When the cutting edge 8 is replaced, since the wear has come to the B line, which is the lower end of the blade front plate 1, the welded portion 3 between the end of the blade front plate 1 and the cutting edge 8 has already been worn. It is only necessary to remove the bolt 5.

Further, if the wear continues after the wear reaches the B-line which is the lowermost position of the blade front plate 1, the cutting edge 8 and the blade front plate 1 will be worn, If the wear progresses to the A line which is the position of the root 51 of the bolt head of the bolt 5, the cutting edge 8 will fall off the bolt 5 because the bolt head of the bolt 5 will be lost. Blade reinforcement member 2
The operator can prompt the operator to replace the cutting edge 8 before making a hole in the bottom plate portion 24 due to wear.

Next, regarding the attachment of the cutting edge 8 having a U-shaped cross section to the blade, a third welding step will be described.
Referring to FIG. 6, the embodiment of FIG. 6 will be described. When the bottom plate 24 of the blade reinforcing member 2 and the cutting edge 8 having a U-shaped cross section are not formed with bolt holes for attaching them, the cutting edge 8 When attaching the cutting edge 8 to the blade, as shown in FIG. 6, one side of the cutting edge 8 is brought into contact with the bottom plate 24 of the blade reinforcing member 2 and the end is attached by the welded portion 3.
The other side of the cutting edge 8 is brought into contact with the lower back surface of the blade front plate 1, and is mounted so as to protrude downward from the lower end of the blade front plate 1 by the end portion of the blade front plate 1 and the welded portion 3.

In the case of mounting by welding, the cutting edge 8 has been worn down for a long time by the backfilling of the earth and sand or the leveling work to the B line, which is the lower end of the blade front plate 1. Since the operator can easily confirm it from the front of the blade by visual observation, the time when the cutting edge 8 is replaced is
The welding edge 3 connecting the cutting edge 8 and the blade reinforcing member 2 is blown off while being melted by the heat of the welding burner, or is scraped off by a grinder, thereby cutting the cutting edge 8 to the bottom plate portion 24 of the blade reinforcing member 2. Remove from Then, the new cutting edge 8 is similarly attached to the bottom plate 24 of the blade reinforcing member 2 and the blade front plate, and the end of the blade front plate 1 and the cutting edge 8 by welding.

Further, if the wear continues after the wear reaches the B-line which is the lowermost position of the blade front plate 1, the cutting edge 8 and the blade front plate 1 will be worn, It is difficult to deal with the cutting edge 8 under the work load only by the welded portion 3 with the bottom plate portion 24 of the blade reinforcing member 2, and the welded portion 3 is broken and the cutting edge 8 is detached. Before the cutting edge 8 falls and a hole is formed in the bottom plate portion 24 of the blade reinforcing member 2 due to wear, the operator can be prompted to replace the cutting edge 8.

[0029]

As described above, according to the first aspect of the present invention,
According to the invention described in the above, in a construction machine that performs leveling work using a work attachment having a blade, a cross-sectional shape adjusted to an angle between a lower surface of a bottom plate portion of a blade reinforcing member constituting the blade and a back surface of the blade front plate. Since the outer upper surface and the outer front surface of the U-shaped cutting edge were mounted in contact with each other, they could be mounted closely without rattling, and the cutting edge abrasion reached the lowermost position of the blade front plate. Can be easily confirmed from the front of the blade, and it is possible to confirm at a glance that the cutting edge needs to be replaced.This prompts the operator to replace the cutting edge, and damages the blade front plate and causes holes in the blade reinforcing member due to wear. Can prevent emptying,

[0030] The invention described in claim 2 of the present invention provides:
Since the cutting edge in the shape of a cross section is attached to the blade reinforcing member by fastening means, the cutting edge can be closely attached without rattling as in the first aspect of the present invention, and the cutting edge of the cutting edge can be attached. It can be easily confirmed from the front of the blade that the wear has reached the lowermost position of the blade front plate, and it is possible to confirm at a glance that it is time to replace the cutting edge, prompting the operator to replace the cutting edge, It is possible to prevent a hole due to abrasion in the reinforcing member. Further, if the cutting edge is worn further after reaching the lowermost position of the blade front plate, the cutting edge and the blade front plate will be worn, and the bolt head of the bolt will be worn. If the wear progresses to the root position of the bolt, the cutting edge will fall out of the bolt because the bolt head of the bolt will be lost, so the operator is prompted to replace the cutting edge, so the blade front plate is damaged and the blade reinforcing member is worn. Can prevent puncturing,

The invention according to claim 3 of the present invention provides:
Since the cutting edge having a U-shaped cross section is attached to the blade front plate and the blade reinforcing member by welding means and fastening means, the cutting edge can be closely attached without rattling, and the cutting edge is worn. Can be easily confirmed from the front of the blade that it has reached the lowermost position of the blade front plate, and it is possible to confirm at a glance that the time to replace the cutting edge has come, prompting the operator to replace the cutting edge, and reinforcing the blade. Drilling of holes in the member can be prevented. Further, if the wear of the cutting edge reaches the lowermost position of the blade front plate and continues to be used further, the cutting edge and the blade front plate will wear, and the wear will be reduced by the bolt head of the bolt. If the wear progresses to the base position of the bolt, the cutting edge will fall off the bolt because the bolt head of the bolt will be lost, so the operator is prompted to replace the cutting edge,
It is possible to prevent damage to the blade front plate and drilling holes due to wear on the blade reinforcing member,

Further, the invention described in claim 4 of the present invention provides:
Since the cutting edge having a U-shaped cross section is attached to the blade reinforcing member by welding means, the cutting edge can be closely attached without rattling and wear of the cutting edge is located at the lowermost position of the blade front plate. It can be easily confirmed from the front of the blade that the cutting edge has been reached, and it is possible to confirm at a glance that it is time to replace the cutting edge, prompt the operator to replace the cutting edge, and damage the blade front plate and wear the blade reinforcing member. Can prevent the hole from being drilled,

The invention according to claims 5 and 6 of the present invention is directed to a bulldozer blade, which is an attachment for a large-sized construction machine, and has a sectional shape formed on the back surface of the lower end of the grader and the lower surface of the bottom plate of the blade reinforcing member. Since the outer upper surface and the outer front surface of the U-shaped cutting edge were mounted in contact with each other, they could be mounted closely without rattling, and the cutting edge abrasion reached the lowermost position of the blade front plate. Can be easily confirmed from the front of the blade, and it is possible to confirm at a glance that the cutting edge needs to be replaced.This prompts the operator to replace the cutting edge, and damages the blade front plate and causes holes in the blade reinforcing member due to wear. Can prevent emptying,

Further, the invention according to claim 7 of the present invention provides:
Outer upper surface and outer front surface of a cutting edge having a U-shaped cross section at the back of the lower end of the blade front plate and the lower surface of the bottom plate of the blade reinforcing member of a small construction machine having a shovel-based front attachment and a blade. As it is mounted in contact with the blade, it can be mounted closely without rattling, and it can be easily confirmed from the front of the blade that the wear of the cutting edge has reached the lowermost position of the blade front plate. At a glance, it is possible to confirm at a glance that it is time to replace the cutting edge, prompting the operator to replace the cutting edge, and in particular, small construction machines that do not consider the wear resistance with earth and sand more than large construction machines In the case of the above-mentioned blade, it is possible to prevent damage to the blade front plate and puncturing of the blade reinforcing member due to wear. In which an effect called.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a construction machine,

FIG. 2 is a partially cutaway perspective view of a cutting edge having a U-shaped cross section;

FIG. 3 is a cross-sectional view showing a first embodiment of the present invention, in which a cutting edge having a U-shaped cross section is attached to a blade reinforcing member by a bolt;

FIG. 4 is a sectional view showing a worn state of the blade shown in FIG. 3;

FIG. 5 is a cross-sectional view showing a second embodiment of the present invention, in which a blade-reinforcing member is bolted, and a blade-shaped cutting edge is attached to a blade front plate by welding;

FIG. 6 is a sectional view showing a third embodiment of the present invention, in which a blade-shaped cutting edge is attached to a blade reinforcing member and a blade front plate by welding;

FIG. 7 is a sectional view showing a conventional example, in which a straight cutting edge is attached to a lower front portion of a blade front plate;

FIG. 8 is a sectional view showing a worn state of the blade shown in FIG. 7;

[Explanation of symbols] i Construction equipment, b front attachment, c
Blade, push arm, 1 blade front plate, 1
DESCRIPTION OF REFERENCE NUMERALS 1 Blade front plate wear loss portion, 12 edge mounting hole, 2 blade reinforcement member, 21 blade reinforcement member wear loss portion, 22 blade reinforcement member bolt hole, 23 upper surface of blade reinforcement member bottom plate, 2
4 Bottom plate part of blade reinforcing member, 3 welded parts, 4 Cutting edge, 41 Wear-eliminated part of cutting edge, 42 Bolt hole of cutting edge, 5
Bolts, 51 Root positions of bolt heads, 6 nuts, 61 nuts, 7 welds, 8 Cutting edge with cross-shaped U-shape, 81 Loss of wear of cutting edge, 82 Bolt hole of cutting edge.

Claims (7)

[Claims] 1. A construction machine for leveling work using a work attachment having a blade, the blade comprising a blade reinforcing member attached to a back surface of a blade front plate, and a lower surface of a bottom plate portion of the blade reinforcing member. A blade structure of a construction machine blade for performing leveling work, wherein an outer upper surface and an outer front surface of a cutting edge having a U-shaped cross section are attached to and contacted with a back surface of a blade front plate. 2. The blade according to claim 1, wherein the cutting edge having a U-shaped cross section is attached to the blade reinforcing member by fastening means. Construction. 3. The ground according to claim 1, wherein said cutting edge having a U-shaped cross section is attached to a blade front plate and a blade reinforcing member by welding means and fastening means, respectively. Construction machine blade structure for leveling work. 4. The ground according to claim 1, wherein the cutting edge having a U-shaped cross section is attached to the blade front plate and the blade reinforcing member by welding means. Construction machine blade structure for leveling work. 5. The blade structure of a construction machine for performing leveling work according to claim 1, wherein the construction machine is a bulldozer. 6. The structure of a blade of a construction machine for performing leveling work according to claim 1, wherein the construction machine is a grader. 7. The construction for leveling work according to claim 1, wherein the construction machine is a small construction machine having a shovel-based front attachment and a blade. The structure of the machine blade.