Stable bucket tooth, tooth seat and assembly for excavator

Abstract

The invention discloses a stable bucket tooth, a tooth seat and an assembly for a excavator. The assembly comprises the bucket tooth with a bucket tooth cavity, the tooth seat with a tooth seat head and a lock pin element, wherein the bucket tooth cavity of the bucket tooth is provided with an inner surface complementary with the outer surface of the tooth seat head, the front end of the tooth seat head is provided with a front end surface orthogonal with the center axial line of the tooth seat head, the upper part and the lower part of the tooth seat head are respectively provided with a first group of matching surfaces, transitional surfaces and a second group of matching surfaces from the front end surface, each group of matching surface and the transitional surface respectively comprise at least three matching surfaces in transverse and sequential ranging and symmetrical arrangement, a preset obtuse angle is formed between the adjacent matching surfaces, in addition, the matching surface positioned in the middle of each group of matching surfaces is parallel to the center axial line of the tooth seat head, and the matching surfaces at two sides are parallel to the center axial line or are slightly contracted from the back to the front in the center axial line direction. When the multidimensional complicated action effect is received, the stress is more uniform, higher stability can be maintained, meanwhile, the rejection ratio when the bucket tooth in the larger size is cast is favorably reduced so that the production cost is reduced, and the bucket tooth, the tooth seat and the assembly are particularly suitable for excavation and loading operation machinery in engineering machinery and mine machinery.

Description

technical field [0001] The invention relates to parts of excavating and loading operation machinery in engineering machinery and mining machinery, in particular to excavator bucket teeth, tooth seats and matching components thereof. Background technique [0002] Excavator is a commonly used construction machinery and mining machinery. When digging and loading operations, the bucket of the excavator is the mechanism for digging and loading operations. During the operation, the bucket plays the role of cutting and loading materials. Due to the harsh working environment, the bucket is not only subjected to very complex forces, but also needs to withstand huge wear and tear. If no protection or strengthening measures are taken at the front end of the bucket, the working parts of the bucket will be blunted or even damaged quickly, thus failing to meet the requirement of maintaining efficient work for a long period of time. Installing the bucket tooth assembly on the working side...

AI Technical Summary

Problems solved by technology

However, in actual use, it is found that it still has the following deficiencies: one is that the number of mating surfaces on the inner surface of the cavity at the rear end of the bucket teeth is relatively small, and the upper part of the cavity is only provided with a mating surface at the front end and the rear end respectively. The lower part of the bucket tooth body only has one mating surface at the front end and the rear end, so the force is not uniform enough; secondly, because the number of mating surfaces at the upper and lower parts of the aforementioned bucket tooth cavity is small, the area of ​​a single mating surface is relatively large. , this is not a big problem when the size of the bucket teeth is small, but when the size of the bucket teeth is large, during the casting process, the size deviation may be large due to the uneven cooling shrinkage of the casting during the cooling shrinkage process, It affects the matching accuracy of the bucket teeth and the tooth seat, which in turn affects the stability of the excavating tooth assembly, and even fails to effectively cooperate due to too large a size deviation; the third is the connection between the side wall of the bucket tooth cavity and each mating surface If the radius of curvature is too small, the connection is likely to become a stress concentration point, so it is relatively easy to crack and other problems during use

[0007] The Chinese patent application No. 201110287418.1 discloses "an excavator bucket tooth assembly". In this patent, the front end of the tooth seat head is a prismatic structure, and the rear end is a wedge-shaped structure, but the upper and lower parts are asymmetrical structures , and there is a design perpendicular to each other between the two sides, so it has the disadvantages of uneven force, and the stress at the vertical connection is too concentrated and easy to crack. At the same time, the front and rear mating surfaces are directly connected, which is prone to When receiving torque, the two points of force are too close to the problem that the torque force is too large

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