Crane Piston-Cylinder Force Application Regions
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Solution Overview
Problem
Current loading cranes face limitations in handling increased loads due to structural deformations in piston-cylinder units, requiring material thickness increases for reinforcement, leading to higher costs and weight.
Innovation Solution
The piston-cylinder unit engages the jib extension through two force-application regions, with one region arranged opposite to the compressive deformation and the other opposite to the tensile deformation, reducing maximum amplitude and allowing for increased load handling without reinforcing the piston-cylinder unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the material thickness of the piston-cylinder unit is increased to handle increased loads, then the load handling capacity is improved, but the weight and manufacturing costs increase
Solution Approach 1:
The patent transitions from a single central force-application region to multiple force-application regions distributed across different spatial dimensions (eccentric positions around the piston-cylinder unit). This dimensional redistribution of force application points allows the structure to handle increased loads through geometric configuration rather than increasing material thickness, thereby maintaining weight efficiency while improving load capacity.
Solution Approach 2:
The patent applies force at specific localized regions (eccentric positions) rather than uniformly across the entire piston-cylinder unit. By concentrating force application at strategically positioned regions that counteract deformation patterns, the structure achieves improved load handling capacity only where needed, avoiding unnecessary material reinforcement throughout the entire component.
2Stability of the object's composition
If the material thickness of the piston-cylinder unit is increased to reduce deformation, then the structural stability is improved, but the manufacturing costs increase
Solution Approach 1:
The patent addresses structural stability by distributing force-application regions across multiple eccentric positions rather than relying on increased material thickness. This spatial redistribution creates a more stable structural configuration that resists deformation through geometric arrangement, reducing the need for costly material reinforcement.
Solution Approach 2:
The patent enhances structural stability by applying forces at specific localized eccentric regions that correspond to areas of highest stress or deformation risk. This targeted approach provides stability reinforcement only where structurally necessary, avoiding the uniform material thickening that would increase manufacturing costs across the entire component.
3Manufacturing precision
If the material thickness of the piston-cylinder unit is increased to reduce deformation amplitude, then the precision of operation is improved, but the weight increases
Solution Approach 1:
The patent achieves precise deformation control by distributing force-application regions across multiple eccentric positions around the piston-cylinder unit. This spatial arrangement allows for fine-tuned control of deformation patterns in different directions, achieving high precision operation without the weight penalty of uniformly thicker materials.
Solution Approach 2:
The patent controls deformation precision by applying forces at specific eccentric regions that correspond to areas requiring precise dimensional control. By localizing force application to these critical regions, the patent achieves high manufacturing precision only where needed, avoiding the excessive weight that would result from increasing material thickness throughout the entire component.
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 significantly increases the force for extending and retracting the jib extension, reducing deformation amplitude and enabling higher load handling without material reinforcement, thus reducing costs and weight.
Implementation Method 1
the at least one piston-cylinder unit in a compressive-loaded condition upon extension has a compressive deformation in a direction perpendicularly to the central plane
Implementation Method 2
and in a tensile-loaded condition upon retraction has a tensile deformation in a direction opposite to the compressive deformation
Data Source
AI summary
A crane includes a crane pillar rotatably mounted about a vertical axis, at least one jib, connected to the crane pillar and pivotally mounted about a horizontal axis, at least one jib extension movably mounted in the jib, and at least one piston-cylinder unit for extending and retracting the jib extension relative to the jib. The first end of the piston-cylinder unit engages the jib via at least one first force-introducing region, and the second end engages the at least one jib extension via at least one second force-introducing region. The piston-cylinder unit has a central plane parallel to the horizontal axis about which the jib is pivotally mounted, and the piston-cylinder unit has a compressive deformation perpendicular to the central plane in a pressure-loaded state while the jib is being extended and a tensile deformation opposite the compressive deformation in a tension-loaded state while the jib is being retracted.