Modular Hoist Drum With Internal Anchors
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Solution Overview
Problem
Existing hoist drums in power shovels face issues such as cracked weld seams, premature rope pullout due to tangential rope trajectories, and potential drum crushing under high loads, making them unreliable and difficult to inspect or repair.
Innovation Solution
A modular hoist drum design featuring a hollow cylindrical anchor body with internal anchors having a non-tangential flat bottom and axial retainers, connected between two outer bodies with beveled edges for improved weld seam reception, enhancing structural integrity and preventing rope rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional external anchors with tangential rope trajectories are used, then the hoist drum can be simpler in structure, but the ropes can pivot relative to the drum causing premature rope pullout and reduced reliability
Solution Approach 1:
The patent inverts the traditional anchor configuration by moving the anchors from the external surface to the internal cavity of the drum. The internal anchors with non-tangential flat bottoms prevent rope pivoting by creating a mechanical stop that the rope ferrule cannot overcome, thereby eliminating the rope pullout issue while maintaining structural simplicity
Solution Approach 2:
The internal anchors are nested within the hollow cylindrical drum body, with the rope ferrules positioned inside the drum cavity rather than outside. This nesting arrangement allows the anchors to effectively constrain the ropes from the interior, preventing pivoting and pullout while keeping the overall structure compact
2Strength
If welded anchors are used on the external surface, then the assembly process can be simpler, but the weld seams can crack and fail under high loads
Solution Approach 1:
By inverting the anchor position to the internal cavity, the weld seams are relocated from external surface anchors to the internal anchor mounting points. This inversion allows for better weld access and inspection from the inside, improving weld integrity while maintaining manufacturing simplicity through the modular anchor design
Solution Approach 2:
The anchor design incorporates localized reinforcement features such as the flat bottom surface and radial retainers that concentrate strength where needed. The weld seams are positioned at optimized locations within the internal cavity where stress distribution is improved, preventing crack propagation while keeping the overall manufacturing process simple
3Ease of repair
If internal modular components are used, then inspection and repair can be easier, but the drum structure becomes more complex
Solution Approach 1:
The drum is segmented into modular components including the hollow cylindrical body, internal anchors, and end plates. This segmentation allows individual components to be inspected and replaced independently, making maintenance easier while the modular assembly maintains a relatively simple overall structure
Solution Approach 2:
The internal anchors are designed as extractable components that can be removed from the drum cavity for inspection and replacement without dismantling the entire drum structure. This extraction capability significantly ease repair operations while the anchors remain integrated during normal operation, maintaining structural simplicity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The modular design enhances longevity and reliability by preventing rope rotation and premature pullout, while the beveled edges and external weld seams facilitate easier inspection and repair, ensuring durable performance under high loads.
Implementation Method 1
The first outer body, the second outer body, and the anchor body are generally welded together to form the hoist drum
Data Source
AI summary
A modular hoist drum is disclosed for use with a power shovel. The modular hoist drum may have a first outer body, a second outer body, and an anchor body that are hollow and generally cylindrical. The anchor body is connected between the first outer body and the second outer body. The anchor body may include an internal anchor configured to receive a ferrule.