Cable Winch Longitudinal Shifting for Deflection Control
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Solution Overview
Problem
Cable winches on cranes, particularly deep sea cranes, experience excessive cable wear due to large deflection angles at flanged pulleys, leading to potential cable failure.
Innovation Solution
A cable winch device with a shifting mechanism that allows partial movement along its longitudinal axis, enabling independent adjustment of cable deflection angles and precise positioning, thereby minimizing wear by preventing excessive angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the cable is wound in multiple layers on the cable winch, then the cable length capacity is improved, but the deflection angle increases causing cable wear
Solution Approach 1:
The cable winch is made movable along the longitudinal axis of the boom through a shifting mechanism, allowing dynamic adjustment of the winch position. This enables the system to adapt the deflection angle during operation, maintaining it within acceptable limits even when winding cable in multiple layers, thus preventing excessive cable wear while preserving cable length capacity
Solution Approach 2:
The position of the cable winch along the boom is varied by shifting it to different locations. By changing this spatial parameter, the deflection angle of the cable can be controlled and kept within a justified angular range, preventing the harmful effect of excessive wear while allowing multiple layer windings
2Device complexity
If the cable winch position is fixed on the crane, then the device complexity is reduced, but the adaptability to different cable angles is limited
Solution Approach 1:
Instead of a fixed position, the cable winch is equipped with a shifting mechanism that allows it to move along the longitudinal axis of the boom. This dynamic positioning capability provides adaptability to different cable angles and crane configurations without requiring complex additional cable guiding elements or bending changes
Solution Approach 2:
The shifting mechanism serves multiple functions: it adjusts the deflection angle, adapts to different crane boom positions, and eliminates the need for additional cable guiding elements. This multi-functionality provides versatility without proportionally increasing device complexity
3Object-affected harmful factors
If additional cable guiding elements are added to adjust cable angles, then the cable wear is reduced, but the device complexity increases
Solution Approach 1:
The problem of cable wear due to excessive deflection angles is solved by extracting the adjustment function from separate cable guiding elements and integrating it into the cable winch itself. By making the winch movable, the winch directly controls the deflection angle without requiring additional guiding elements, thus reducing device complexity while preventing cable wear
Solution Approach 2:
The shifting mechanism acts as an intermediary that mediates between the fixed crane structure and the cable path. By adjusting the winch position, it controls the cable deflection angle indirectly, achieving wear prevention without the need for direct cable guiding elements at the boom
Data Source
AI summary
A cable winch device, particularly a cable winch device for a crane, has at least one cable winch with at least one cable, with the cable wound and/or unwound at least partially on the cable winch. The cable winch can be shifted and/or moved at least partially substantially along the longitudinal axis of the cable winch. A crane, particularly a deep sea crane, has at least one such cable winch device.