Combination Double Bottom Block with Floating Pulley
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Solution Overview
Problem
Conventional double bottom blocks in crane systems face challenges when lifting loads above 50% of the nominal working load, requiring additional equipment or reducing lifting height due to tilting pulley blocks and geometric imbalances.
Innovation Solution
The solution involves locking two pulley blocks to prevent tilting and introducing a floating pulley between them, utilizing the central mount to maintain load capacity with one hoisting cable, effectively creating an odd-numbered single bottom block configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If two pulley blocks are locked to prevent tilting, then stability is improved, but the gap between pulley blocks remains and requires bridging which increases deflection angles
Solution Approach 1:
A floating pulley is introduced as an intermediary element between the two locked pulley blocks. This floating pulley bridges the gap created by the locked pulley blocks, allowing the hoisting cable to pass through without creating large deflection angles. The floating pulley acts as a mediator that maintains the stability provided by the locked pulley blocks while eliminating the harmful effect of excessive deflection angles.
2Device complexity
If pulley blocks are removed or shifted to create a single bottom block, then device complexity is reduced, but nominal working load is cut by 50%
Solution Approach 1:
The invention makes the double bottom block configuration universal by enabling it to function effectively with a single hoisting cable while maintaining the full nominal working load capacity. The floating pulley system allows the same physical structure to serve multiple functions: it can operate with one cable for maximum load capacity or with two cables for balanced operations, eliminating the need to remove or shift pulley blocks and thus avoiding the 50% load reduction.
3Object-affected harmful factors
If distance between pulley block and bottom block is increased to reduce deflection angles, then deflection angles are reduced, but lifting height is reduced
Solution Approach 1:
The floating pulley serves as an intermediary that allows the hoisting cable to transition smoothly between the pulley blocks without requiring increased distance. By providing a intermediate support point, the floating pulley enables the cable to follow a more favorable path that reduces deflection angles while maintaining the original lifting height.
4Force
If conventional double bottom block is used, then load capacity is maintained, but conversion requires additional equipment or reduces lifting height
Solution Approach 1:
The invention introduces dynamic elements (floating pulley, pins for locking) that allow the double bottom block to be adapted to different operating conditions without requiring additional equipment. The system can dynamically adjust between single-cable and double-cable configurations, or between locked and unlocked pulley block states, enabling conversion between different operational modes while maintaining full load capacity and lifting height.
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 configuration allows for increased lifting height with reduced deflection angles, eliminates the need for equipment removal or shifting, and expands application possibilities while maintaining cost-effectiveness and efficiency.
Implementation Method 1
a floating pulley supported between the two pulley blocks
Implementation Method 2
the two pulley blocks are locked with pins to prevent them from tilting
Data Source
AI summary
The invention relates to a combination double bottom hook block in which two pulley blocks (2, 3) each with a plurality of pulleys are connected to one another by means of a rocker (1), a load hook being mounted in a pivotable manner on the rocker. If use is made here of two lifting cables, each of these lifting cables is led over a pulley block (2, 3) and, in order to achieve the same loading capability if use is made of just one lifting cable, the latter is led, in addition, over a floating pulley (2) which is mounted between the two pulley blocks (2, 3), the two pulley blocks (2, 3) also being secured against tilting.