Excavating Bucket Lip Angle and Depth Optimization
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Solution Overview
Problem
Conventional excavating buckets face challenges in increasing capacity while minimizing the load on the arm, leading to twisting and increased excavation resistance, which affects soil discharging performance.
Innovation Solution
The excavating bucket design features a bucket body with two curved surface sections of different radii, a lip section, and a bracket with a specific wrist radius and lip angle configuration (62°≦θ≦72° and 0.7≦D/V≦0.8) to enhance capacity without widening, reducing excavation resistance, and ensuring effective soil discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the capacity of the excavating bucket is increased by widening the width, then the bucket capacity increases, but the load on the arm increases
Solution Approach 1:
The patent transitions from increasing bucket capacity through width expansion to depth expansion. By optimizing the bottom surface curvature radius and lip angle, the bucket achieves greater capacity through increased depth (D/V ratio optimized to 0.7-0.85) rather than width, thereby maintaining acceptable arm load levels while achieving the desired capacity increase
2Volume of moving object
If the capacity of the excavating bucket is increased by widening the width, then the bucket capacity increases, but twisting is generated during operation
Solution Approach 1:
The patent resolves the stability issue by shifting the capacity increase strategy from width to depth. The optimized bottom surface curvature radius (0.15-0.25 times wrist radius) and lip angle (62°-72°) create a deeper bucket profile that increases capacity without the lateral instability and twisting that result from width expansion
3Volume of moving object
If the curvature of the bottom surface section is increased to deepen the bucket, then the bucket capacity increases, but the excavation resistance increases when the lip angle is too large
Solution Approach 1:
The patent optimizes the lip angle parameter within a specific range (62°-72°) to balance capacity and excavation resistance. This parameter optimization ensures that the bottom surface can be sufficiently curved to increase depth and capacity, while the controlled lip angle prevents excessive excavation resistance, achieving an optimal trade-off between these two competing requirements
4Volume of moving object
If the lip angle is increased to deepen the bucket, then the bucket capacity increases, but the soil discharging performance deteriorates
Solution Approach 1:
The patent constrains the lip angle to a specific range (62°-72°) to simultaneously achieve depth optimization and maintain soil discharging performance. This parameter control ensures that while the bottom surface curvature is increased to deepen the bucket, the lip angle remains within bounds that preserve effective soil discharge, preventing the deterioration that would occur with excessive lip angles
Data Source
AI summary
An excavating bucket includes a bottom surface section, a bucket body having a rear surface section and a side surface section, a lip section, a bracket, and teeth. The lip section is fixed to an edge portion of the bucket body at an opposite side to the rear surface section. The bracket has a hole through which a coupling pin for attaching to the arm passes. When the length of a virtual line S1 linking the center of the hole and the front end of the lip section is set as a wrist radius V, a length of the longest line segment perpendicular to the virtual line S1 from the virtual line S1 to the bottom surface section is set as a bucket depth D, and the angle formed between the lip section and the virtual line S1 is set as a lip angle θ, 62°≦θ≦72° and 0.7≦D/V≦0.8.