Traveling Crane Cable Drum Segmentation for Load Stability
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Solution Overview
Problem
Existing travelling cranes face limitations in lifting heavy loads due to the need for larger cable drums and increased gearbox output torque, which reduces the serviceable life of cables and cable drums, and complicates uniform lifting and lowering of loads.
Innovation Solution
A travelling crane design with two parallel cable drums, each with a single groove, allowing opposite rotation and a hoisting winch trolley that displaces the cable drums to maintain a constant cable run-out point, reducing cable drum diameter and gearbox size while ensuring stable load lifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a larger cable drum diameter is used to accommodate long cable lengths for heavy loads, then the bearing load capacity is improved, but the gearbox output torque requirement increases and serviceable life decreases
Solution Approach 1:
The cable drum is divided into multiple cable grooves (e.g., 4 grooves) that operate in parallel, allowing the cable length to be effectively distributed across multiple segments. This segmentation enables the use of a smaller drum diameter while maintaining the required cable length through multi-layer winding, thereby reducing the gearbox torque requirement while still supporting heavy loads.
Solution Approach 2:
The solution transitions from extending the drum length in one dimension to utilizing the radial dimension by winding cable in multiple layers across multiple grooves. This dimensional change allows achieving the required cable length capacity with a compact drum diameter, reducing the leverage arm and thus the gearbox output torque requirement.
2Object-affected harmful factors
If the cable drum diameter is increased to reduce cable deflection angles, then cable stress loading is reduced, but the gearbox output torque requirement increases
Solution Approach 1:
Multiple cable grooves segment the cable winding path, allowing the cable to be distributed across several grooves rather than concentrated in a single large-drum configuration. This segmentation maintains smaller deflection angles by providing multiple entry/exit points while keeping the drum diameter compact.
Solution Approach 2:
The invention changes the winding parameters by introducing multiple grooves and multi-layer winding patterns, which alter the cable path geometry. This parameter change reduces the effective wrap angle per groove while maintaining overall cable length, thereby reducing cable stress without requiring a larger drum diameter.
3Stability of the object's composition
If a double-grooved cable drum with opposite direction grooves is used for 8/2 reeving, then the lower block movement stability is improved, but the cable drum length and diameter must be increased
Solution Approach 1:
The cable drum is segmented into multiple grooves (more than just double-grooved) that handle different cable strands in parallel. This segmentation allows the stable lower block movement to be achieved through coordinated winding across multiple smaller groove sections rather than requiring a single long drum.
Solution Approach 2:
The solution uses multi-layer winding across multiple grooves to achieve the required cable length capacity without extending the drum length. The cable is distributed across grooves in different radial layers, utilizing the radial dimension to provide length capacity while maintaining a compact drum geometry.
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
This design extends the serviceable life of cables and cable drums, allows for a smaller gearbox, and ensures uniform load lifting and lowering, accommodating heavier loads with reduced cable stress and increased operational efficiency.
Implementation Method 1
The cable drums each have an axis of rotation extending transversely with respect to the transverse direction and can be operated in an opposite direction of rotation
Implementation Method 2
The travelling trolley is provided with a travelling mechanism for displacing the cable drums in the longitudinal direction of the cable drum in such a manner that the cable run-out point remains in one location in relation to the longitudinal extension of the cable drum
Data Source
AI summary
A traveling crane includes a longitudinal beam displaceable on rails. A traveler having a hoisting winch with a cable drum is displaceable in a transverse direction, and is operable to wind a cable reeved through at least one lower block. The hoisting winch is displaceable relative to the traveler in a hoisting winch travel direction such that a cable run out point remains in one location relative to the longitudinal extent of the cable drum. Two winching hoists are provided which are displaceable transversely to the longitudinal beam with respective cable drums thereof being disposed parallel to and spaced from each other. A common cable can be wound up and down by the two cable drums, and the two cable drums include cable grooves running in opposite directions. The two cable drums are operable in the opposite direction of rotation for lifting and lowering a load.