JPH10183698A - Drilling bucket equipment - Google Patents

Abstract

(57) [Summary] [Problem] A side slip of a tooth of a drilling bucket,
Prevents early wear of the adapter insertion hole entrance. SOLUTION: Walls 10A, 10B, 10C and 10D are provided on both ends in the width direction of a tooth 3 made of casting. Protrusions 11A and 11B wider than the width of the tip of the tooth are provided at the center of both sides, and the ridges at the vertices are made by dispersing and casting ultra-hard particles. The adapter insertion hole entrance at the base end of the tooth 3 Above and below the wall 12A of the required height,
By providing 12B, the wear life of both side surfaces of the tooth 3 and the upper and lower portions of the base end portion is greatly improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavating bucket device for a construction machine such as a hydraulic excavator, and more particularly to an excavating bucket using a tooth having a long wear life by dispersing and casting ultra-hard particles on the upper surface of the tip. Related to the device.

[0002]

2. Description of the Related Art As shown in FIG. 1, the teeth of an excavating bucket of a construction machine such as a hydraulic shovel are formed into a plurality of tooth mounting adapters 2 fixedly provided at the tip of a bucket 1 to form blades. Tooth 3 is attached via pin 4.

FIG. 8 is a side sectional view of a conventional tooth 20 in which the tooth mounting adapter 2 is inserted and attached, FIG. 9 is a plan view, and FIG. 10 is a sectional view taken along line BB of FIG. 8 and 9, the distal end portion 21 of the tooth 30 has a sharp shape to improve the bite, and has a substantially V-shape that gradually increases in height toward the base end portion. An insertion hole 32 for inserting the tooth mounting adapter 2 and a pin hole 33 for inserting the pin 4 are provided at the rear end. The cross-sectional shape of the tooth 30 is a rectangular cross-section as shown in FIG. When the tooth 30 is mounted, the tooth 30 is inserted into the insertion hole 32 of the tooth mounting adapter 2 and the pin 4 is inserted into the pin hole 33 so as to penetrate the tooth mounting adapter 2 to prevent the tooth 30 from coming off.

Conventionally, various proposals have been made for teeth. One example is disclosed in Japanese Patent Application Laid-Open No. Hei 7-30395.
No. 6 and Japanese Utility Model No. 7-2742.

[0005] Japanese Patent Application Laid-Open No.
No. -303956 relates to a production method in which ultra-hard particles are dispersed and cast into the upper surface of the tooth at the time of tooth casting, and is intended to improve the wear life of the upper surface of the tooth.

Japanese Utility Model Publication No. 7-2742, filed by the present applicant, has a substantially cross-shaped cross section in which the middle portion is thick in the width direction of the tooth and the outside is thin. Abrasion is caused from both ends in the width direction to make it difficult to wear the intermediate portion, and a sharp edge is secured to maintain sharpness.

[0007]

However, when the rock quality is generally hard, the bucket 1 is inclined with respect to the rock surface 30 as shown in FIG. 11, and the outermost teeth 30A are intensively cut into the rock to break the rocks. I do. Therefore, FIG.
As shown by hatched portions in the figure showing the wear condition of the teeth of the entire bucket, the teeth 30A and 30E on both outer sides of the bucket 1 are shown.
Wears prematurely. In addition, the outer side wears out quickly and slides, and as shown in FIG. 13, a hole 34 is formed on the side surface of the tooth 30 and the tooth mounting adapter 2 is damaged. FIG.
As shown in FIG. 15, the upper surface 35 of the entrance of the insertion hole 32 (shown in FIG. 8) of the tooth 30 is shaved and worn because rocks and sand flow as indicated by the arrow K, and the P portion is formed as shown in FIG. There is a problem that the tooth mounting adapter 2 is exposed due to abrasion, and this portion is damaged.

[0008] In order to solve the above-mentioned problems, Japanese Patent Laid-Open No.
Nos. -303956 and 7-2742 have no effect.

The present invention has been made in view of the above-mentioned problems, and reduces the slip of the side surface of the tooth.
Extends the wear life at the entrance of the insertion hole of the tooth mounting adapter and reduces the risk of damaging the tooth mounting adapter.
It is an object of the present invention to provide a drilling bucket device having a long life.

[0010]

In order to achieve the above object, a first invention of a tooth of an excavating bucket according to the present invention is a tooth mounting fixed to a tip of an excavating bucket of a construction machine. An excavating bucket device comprising an adapter for use and a substantially V-shaped tooth which is inserted into and attached to the base end of the adapter and has a height that sequentially increases from the front end toward the base end in a side view. Walls 0A, 10B, 10C, and 10D are provided above and below both ends in the width direction of the tooth so as to gradually increase in height from the tip end to the base end. Raised portion 11 equal to or greater than thickness
This is a configuration in which excavating teeth having A and 11B are provided. According to the above configuration, since the thickness of the tooth side surface is increased and the wear allowance increases, and the area is increased, heat generation can be suppressed. Therefore, the wear life of the side surface is significantly increased, and therefore, the life of the tooth is increased. Is greatly extended.

According to a second aspect of the present invention, in the configuration of the first aspect, the tooth is a cast product, and the raised portions 1 provided on both side surfaces thereof are provided.
1A and 11B are characterized by having a configuration in which super-hard particles are dispersed and cast. According to the above configuration, a hardened layer is formed on the raised portions on both side surfaces, and in addition to the effects of the first invention, the wear life of the side surfaces is further extended, the holes are formed in the teeth due to the wear, and the tooth mounting adapter is used. The risk of damage is greatly reduced.

According to a third aspect of the present invention, in the configuration of the first aspect, the tooth 3 has wall portions 12A and 12B having required heights at upper and lower edges of an insertion slot into which the tooth mounting adapter 2 is inserted. It is characterized by. According to the above configuration, the edge of the insertion opening is thickened and strengthened, and the risk of being worn and damaging the tooth mounting adapter is reduced.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of an excavating bucket apparatus according to the present invention. FIG.
3 is a side sectional view of the tooth, FIG. 3 is a plan view, FIG. 4 is a perspective view, and FIG. 5 is a sectional view taken along line AA of FIG. In FIGS. 2 and 4, the tooth 3 has a substantially V-shape that gradually increases in height from the distal end toward the proximal end when viewed from the side, and the tooth mounting adapter 2 is inserted into the proximal end. An insertion hole 5 and a pin hole 6 for inserting the pin 4 are provided. As shown in FIGS. 2 to 5, a wall portion 1 that gradually increases in height from a distal end portion to a proximal end portion above and below both ends in the width direction of the tooth 3.
0A, 10B, 10C and 10D are provided, and ridges 11A and 11B are provided at the center of both side surfaces so as to have a width W2 wider than the width W1 of the tip of the tooth 3.

The tooth is a cast product, and the ridge line at the top of the raised portion 11B shown in FIG. 4, that is, the hatched portion (the same is true for the opposite raised portion 11A, not shown), is made of ultra-hard particles during casting. To form a hardened layer.

Hereinafter, a method of forming a cured layer will be described. FIG. 6 is a cross-sectional plan view of the mold.
The gap 27 for the tooth 3 is formed. A plurality of holding members 23 are provided on both sides of the mold 21.
Is arranged. A part of the holding member 23 protrudes into the cavity 27 and the other part is embedded in the mold 21. The holding member 23 is made of a material such as mild steel, copper, nickel or resin that can be melted in a molten metal.
The holding member 23 has a tungsten carbide (for example, W ₂
A hardened layer forming material 26 composed of C) type cemented carbide particles 24 and graphite powder 25 is filled.

A molten cast steel is poured into the mold 20 as described above. When the molten metal is injected, the holding member 23 is melted, and the hardened layer forming material 26 inside comes into contact with the molten metal. Next, the tungsten carbide cemented carbide particles 24 having a large specific gravity move mainly downward while being slightly dissolved in the molten metal and disperse, and the graphite powder 25 mainly dissolves and diffuses in the molten metal. These dispersion and diffusion are almost completed by cooling and solidification of the molten metal, and a cast of tooth 3 is obtained.

FIG. 7 is a schematic plan cross-sectional view of the tooth 3 after casting. In the base material 13, the above-mentioned cemented carbide particles 24 and the graphite powder 25 are dispersed and partially hardened layers 14 are formed in the diffusion portions. It is formed. Therefore, the hardness is improved from the central portion to the tip portion on both side surfaces of the tooth 3, the heat generation is suppressed because the surface area is increased, and the wear allowance is increased, so that the wear life is greatly improved. Therefore, tooth 3
The risk of damage to the tooth mounting adapter 2 due to wear and puncturing of the side surfaces of the tooth mounting adapter 2 is greatly reduced.

As shown in FIGS. 2 to 4, walls 12A and 12B having a height H are provided at the upper and lower edges of the entrance of the insertion hole 5 provided at the base end of the tooth 3. . As a result, the wear life of the inlet of the insertion hole 5 is greatly improved. For this reason, a hole is formed in this portion due to wear, and the risk of damaging the tooth mounting adapter 2 is reduced.

Therefore, the overall life of the tooth 3 is greatly improved (the life is expected to be 2.5 times longer than that of the conventional tooth), and the frequency of replacement of the tooth 3 is also reduced, so that the cost is greatly reduced. I can do it.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bucket equipped with teeth.

FIG. 2 is a side sectional view of the tooth of the present invention.

FIG. 3 is a plan view of the same.

FIG. 4 is a perspective view of the same.

FIG. 5 is a sectional view taken along line AA of FIG. 2;

FIG. 6 is a plan sectional view of a mold for casting a tooth of the present invention.

FIG. 7 is a plan sectional view of the tooth 3 cast by the mold of FIG. 6;

FIG. 8 is a side sectional view of a conventional tooth.

FIG. 9 is a plan view of the same.

FIG. 10 is a sectional view taken along line BB of FIG. 6;

FIG. 11 is an explanatory diagram of rock excavation work using a bucket.

FIG. 12 is a plan view showing how the teeth of the entire bucket are worn;

FIG. 13 is a plan view of a skewed tooth.

FIG. 14 is an explanatory diagram of a state of wear of the upper surface of the tooth.

FIG. 15 is a perspective view showing how the upper surface of the tooth is worn.

[Explanation of symbols]

Reference Signs List 1 bucket 2 tooth mounting adapter 3 tooth 5 insertion hole 10A, 10B, 10C, 10D, 12A, 12B wall 11A, 11B ridge

Claims (3)

[Claims] 1. A tooth mounting adapter fixed to the tip of a digging bucket of a construction machine, and inserted into and attached to a base end of the adapter. In an excavating bucket device having a substantially V-shaped tooth that sequentially increases in height, a wall portion that sequentially increases in height from a distal end portion to a proximal end portion is provided above and below both ends in the width direction of the tooth, An excavating bucket device provided with an excavating tooth having a raised portion having a thickness equal to or greater than the thickness of the tooth tip portion at the center of both side surfaces. 2. The excavating bucket apparatus according to claim 1, wherein the tooth is a cast product, and the raised portions provided on both side surfaces of the tooth have a configuration in which ultra-hard particles are dispersed and cast. Bucket device. 3. The excavating bucket apparatus according to claim 1, wherein the tooth has a wall having a required height at upper and lower edges of an insertion slot into which a tooth mounting adapter is inserted. Bucket device.