Rotatable Shaft Mechanism for Roller Sheeter Load Relief
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Solution Overview
Problem
Existing roller sheeter machines face failures due to stress concentrations and stoppages caused by reaction loads during the processing of raw materials, particularly when foreign elements with higher hardness than the material being processed are encountered, leading to buckling of motion transmission elements.
Innovation Solution
The machine incorporates a mechanism allowing the mobile element to rotate around a pivot axis, connected through a coupling that permits rotation and linear motion, reducing stress concentrations and preventing buckling by allowing the motion-generating shaft to rotate and relieve loads, thus maintaining continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed mechanical mechanism is used to move the mobile roller, then the structure is simple and easy to manufacture, but the mechanism fails under high reaction loads from foreign elements
Solution Approach 1:
The patent applies the dynamics principle by making the motion transmission mechanism rotatable around a pivot axis instead of fixed. The shaft can rotate to change its orientation relative to the rod, allowing the system to adapt to varying load conditions. This dynamic capability enables the mechanism to relieve stresses during overload conditions, preventing buckling while maintaining operational flexibility.
Solution Approach 2:
The patent implements parameter changes by allowing the shaft's angular position to vary around the pivot axis. This changes the geometric parameters of the mechanism, enabling the shaft to rotate and relieve loads that would otherwise cause buckling. The rotatable joint permits continuous operation under varying load conditions by adjusting the orientation of transmission elements.
2Strength
If the motion transmission elements are fixed to prevent movement, then structural stability is maintained, but stress concentrations cause buckling and failures
Solution Approach 1:
The patent applies dynamics by allowing the shaft to rotate around the pivot axis rather than remaining fixed. This rotational freedom enables the motion transmission elements to change their stress state dynamically, relieving concentrations that would cause buckling. The element can adapt its orientation to maintain strength under varying load conditions.
Solution Approach 2:
The patent implements preliminary action by designing the mechanism with a rotatable joint that can preemptively relieve stresses before they cause buckling. The shaft's ability to rotate allows it to anticipate and respond to overload conditions, preventing failures before they occur by continuously adjusting its position to optimize stress distribution.
3Reliability
If the mechanism stops when overload occurs to protect elements, then damage is prevented, but processing stoppages occur reducing productivity
Solution Approach 1:
The patent applies dynamics by enabling the shaft to rotate continuously around the pivot axis, allowing the mechanism to maintain operation during overload conditions. Instead of stopping, the system can adapt its geometry through rotation, relieving stresses and continuing processing without interruption, thus maintaining both reliability and productivity.
Solution Approach 2:
The patent implements continuity of useful action by designing a mechanism that can operate continuously without stopping even under overload conditions. The rotatable shaft allows the transmission mechanism to maintain continuous motion while adapting to load variations, ensuring uninterrupted processing and eliminating productivity losses from stoppages.
4Device complexity
If the shaft is fixed orthogonal to the rod, then the structure is simple and stable, but stress concentrations lead to buckling under high loads
Solution Approach 1:
The patent applies dynamics by replacing the fixed orthogonal configuration with a rotatable joint. The shaft can change its angle relative to the rod around the pivot axis, allowing it to adapt to varying stress conditions. This dynamic adjustment enables the structure to maintain simplicity while improving stress resistance through geometric adaptation.
Solution Approach 2:
The patent implements parameter changes by allowing the angular parameter of the shaft-rod connection to vary. Instead of being fixed at 90 degrees, the connection can rotate to different angles, changing the stress distribution pattern. This geometric parameter change enables the structure to withstand high loads while maintaining structural simplicity.
Data Source
AI summary
A machine opening and closing element for processing raw material having a first element and a second element through which the processed raw material passes, wherein the first element is connected to a mechanism which is connected to a power shaft, said first mechanism being in charge of generating a motion of the first element towards the second element. In particular, the machine for opening and closing element has a coupling arranged in a perforation of a support, such that the coupling may rotate in the perforation.