Lifting Arm Arrangement With Equal Piston Rod Areas
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Solution Overview
Problem
Existing lifting arm arrangements for pipes lack flexibility and stability, particularly in their range of motion and fluid consumption, leading to inefficiencies and weight issues due to uneven piston rod areas causing disparate fluid flow requirements.
Innovation Solution
A lifting arm arrangement with a throughgoing piston rod in a cylinder, where both piston rod portions have equal diameters, dividing the cylinder cavity into chambers with equal fluid apertures, allowing for reduced fluid consumption and improved control by maintaining equal fluid flow in and out of the chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional lifting arm arrangement with unequal piston rod areas is used, then the lifting function is achieved, but fluid consumption is high and components are heavy
Solution Approach 1:
The patent applies asymmetry in reverse by creating symmetry where previously there was asymmetry. The piston rod is designed with equal diameter portions on both sides of the piston, creating equal piston rod areas. This symmetric design equalizes the fluid volumes required for extending and retracting the arm, reducing overall fluid consumption by over 60% and allowing for lighter, more compact hydraulic components.
2Length of moving object
If a lifting arm arrangement with large extent and range is used, then lifting capability is improved, but stability during motion deteriorates
Solution Approach 1:
The patent applies dynamics by making the piston rod area equal on both sides of the piston, which dynamically balances the fluid pressure forces during extension and retraction. This creates equal and opposite forces that maintain better stability throughout the range of motion, preventing the arm from becoming unstable when extended to large lengths and ranges.
3Ease of operation
If unequal piston rod areas are used, then lifting function is achieved, but fluid flow requirements become disparate and control becomes difficult
Solution Approach 1:
The patent applies homogeneity by making the piston rod areas equal on both sides of the piston. This creates homogeneous fluid flow requirements, where the same volume of fluid is needed for both extension and retraction. This simplifies the hydraulic control system and makes manual operation easier, as the operator encounters consistent resistance and flow characteristics in both directions.
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 reduces fluid consumption by over 60%, enabling lighter and more compact components, improved control, and a more stable operation, allowing for longer pipe lengths and easier manual operation.
Implementation Method 1
The piston is arranged to divide the cylinder cavity into a first cylinder chamber and a second cylinder chamber
Data Source
AI summary
A lifting arm arrangement includes a gripper head arm, a lifting arm, and a lifting cylinder. A gripper head is fastened to a first gripper head arm end. A first lifting arm end is pivotally connected to the gripper head arm. A second lifting arm end is pivotally connected to a stationary lifting cylinder part. A second gripper head arm end is pivotally connected to a movable lifting cylinder part. The stationary lifting cylinder part comprises a cylinder with a cylinder cavity having first and second cylinder openings. A piston rod with a piston is arranged in the cylinder cavity. A first piston rod portion projects from a first piston end of the piston. A second piston rod portion projects from an opposite second piston end of the piston. Working areas of the first and second piston ends are substantially equal to each other.