The arm (stick) is a critical structural component in excavator work equipment that connects the boom to the bucket, enabling precise digging and material handling operations.
The arm, also known as the stick or dipper, is a pivotal structural member in excavator work equipment assemblies. It functions as the intermediate linkage between the boom and the attachment (typically a bucket), translating hydraulic cylinder force into controlled linear and rotational motion. Its primary role is to provide the necessary reach, leverage, and force application for digging, lifting, and material placement tasks. The component's geometry, pin connections, and structural integrity directly influence the machine's digging depth, breakout force, and overall operational envelope.
诱因 → 失效模式 → 工程缓解
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The boom is the primary, longest structural member attached directly to the excavator's house (upper structure). The arm (stick) is attached to the end of the boom and connects to the bucket. The boom provides vertical reach and lift height, while the arm provides horizontal reach and controls the digging (crowd) motion.
Cracks typically initiate due to cyclic fatigue from repetitive loading/unloading during digging, material defects, stress concentrations at weld joints or sharp geometry changes, or overload conditions exceeding design limits. Improper welding repairs can also be a significant cause.
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