Shaft Decoupling System for High-Speed Compression Testing
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Solution Overview
Problem
Conventional compression testing systems face challenges in maintaining a constant actuator rate at high speeds, leading to physical damage from sudden stopping and increased maintenance costs due to shear pin breakage and wedging issues.
Innovation Solution
The shaft decoupling system, which includes an inner and outer shaft with a bearing release collar biased by a mechanism, allows the inner shaft to move coaxially with the outer shaft after decoupling, preventing sudden stops and reducing shear pin damage by enabling controlled actuator motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cylinder comes to an abrupt stop when the particular compression depth is met, then the compression testing can be maintained at a substantially constant rate, but physical damage occurs from sudden stopping and maintenance costs increase due to shear pin breakage
Solution Approach 1:
The shaft is divided into two separate components: a fixed shaft connected to the actuator and a movable shaft connected to the cylinder. This segmentation allows the fixed shaft to stop abruptly (maintaining constant rate control) while the movable shaft continues moving (avoiding physical damage), thereby resolving the contradiction between reliable constant rate testing and prevention of physical damage.
Solution Approach 2:
The decoupling mechanism extracts the harmful abrupt stopping action from the cylinder-movable shaft connection and isolates it to only the fixed shaft. By taking out the abrupt stop function and applying it only to the fixed shaft through the decoupling mechanism, the system maintains constant rate control while preventing the movable shaft and cylinder from experiencing physical damage.
2Productivity
If the actuator operates at high speeds, then productivity increases, but shear pin breakage and wedging issues occur leading to increased maintenance costs
Solution Approach 1:
By segmenting the shaft into fixed and movable portions, the system allows high-speed operation of the actuator and fixed shaft while the movable shaft and cylinder are isolated from the high-speed abrupt stopping. This segmentation enables high productivity through fast actuator operation while improving reliability by preventing shear pin breakage and wedging in the movable components.
Solution Approach 2:
The decoupling mechanism acts as an intermediary between the high-speed actuator and the cylinder, absorbing the harmful effects of high-speed abrupt stopping. This intermediary protects the shear pins and movable components from damage while allowing the actuator to operate at high speeds for improved productivity.
3Object-affected harmful factors
If a decoupling mechanism is implemented to prevent sudden stops, then physical damage is reduced, but device complexity increases
Solution Approach 1:
The decoupling mechanism uses simple segmentation of the shaft into two parts with a basic mechanical connection. This straightforward structural division achieves the goal of reducing physical damage without requiring complex control systems or multiple components, thereby minimizing the increase in device complexity.
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 solution enables repeatable compression testing at high actuator rates while minimizing physical damage and maintenance costs by allowing the actuator to slow down before reaching mechanical stops, thus extending the lifespan of testing equipment.
Implementation Method 1
The bearing release collar is biased toward a first position by a biasing mechanism
Data Source
AI summary
A shaft decoupling system (200) includes an inner shaft (202) couplable to an actuator (102), an outer shaft (204) aligned coaxially with the inner shaft, and a bearing release collar (206). The bearing release collar is biased toward a first position by a biasing mechanism and configured to be moved to a second position against a biasing force of the biasing mechanism (222, 322) in response to the bearing release collar contacting a collar strike plate (118) as the actuator moves the shaft decoupling system. When the bearing release collar is in the first position, a bearing (220, 320) is held by the bearing release collar to prevent respective movement of the inner shaft and the outer shaft. When the bearing release collar is in the second position, the bearing release collar permits the bearing to retract such that the inner shaft is permitted to move coaxially with respect to the outer shaft.