Gas Spring Delay Mechanism With Variable Speed Control
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Solution Overview
Problem
In sheet metal stamping processes, existing technologies face challenges in controlling the speed of die elements, particularly gas springs, to increase production efficiency and prevent part damage due to complex part designs and varying press speeds.
Innovation Solution
A variable speed delay system for gas springs is introduced, where an inner rod with a throttle element and controllable gas shut-off valve regulates gas flow between chambers, controlling the rod's recovery speed by managing pressure differences across distinct passages, allowing for adjustable ascent speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the gas spring rod returns at constant speed, then the control is simple, but the productivity is limited because the final withdrawal cannot be faster
Solution Approach 1:
The gas spring system is divided into multiple chambers (first chamber between body and piston, second chamber as evacuation volume, third chamber between body and main rod) with separate passages (first passage through inner rod, second passage through main rod wall) allowing independent control of gas flow rates at different stages of rod retraction
Solution Approach 2:
The system transitions from constant speed control to variable speed control where the rod initially ascends slowly through the first passage with throttling governor, then accelerates through the second passage with larger cross-section, enabling dynamic speed adjustment to optimize both productivity and control
2Productivity
If the press withdrawal speed is increased, then the productivity increases, but the part may be damaged by the gas spring elements
Solution Approach 1:
The system performs preliminary slow ascent through the first passage with throttling governor to prepare for faster withdrawal, allowing the rod to recover part of its path at controlled speed before accelerating through the second passage, ensuring safe part release followed by rapid retraction
Solution Approach 2:
The rod retraction occurs in two distinct phases: initial slow ascent through the first passage with smaller cross-section and throttling control, followed by faster ascent through the second passage with larger cross-section, creating periodic speed variation that protects the part while maintaining productivity
3Speed
If the gas passage cross-section is increased, then the rod returns faster, but the pressure control becomes less effective
Solution Approach 1:
The gas passage system is segmented into two passages with different cross-sections: the first passage through the inner rod has smaller cross-section for slow controlled ascent with better pressure control, while the second passage through the main rod wall has larger cross-section for faster ascent, allowing speed and pressure control to be optimized for different stages
Solution Approach 2:
Different passages are designed with different local qualities (cross-sections) to suit different functional requirements: the first passage has smaller cross-section and throttling governor for precise pressure control during initial ascent, while the second passage has larger cross-section for rapid retraction when less pressure control is needed
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 system enhances productivity by enabling faster final part withdrawal, reducing part damage, and allowing for the production of more complex parts within the same time frame by controlling the rod's return speed and pressure differences across chambers.
Implementation Method 1
A throttle element is disposed inside the hollow inner rod upon passage of the gas, the so-called first passage, wherein a gas shut-off valve controllable from the exterior can also be housed
Implementation Method 2
The speed of recovery of the rod to its extended position depends mainly on the differences in pressure between chambers 1 and 3, in such a manner that the greater the difference, the slower it will ascend
Implementation Method 3
For some time now, gas springs have been used as an elastic force-limiting element in sheet metal stamping processes
Implementation Method 4
anti-spillback valves which only allow passage of the gas therethrough when the rod passes from its extended position to the position corresponding to the compressed spring
Data Source
AI summary
A delay mechanism of a main rod of a gas spring is described, having an inner rod and a series of gas chambers which are defined in the interior of the body of the spring in such a manner that, by controlling the passage of gas between said chambers, the speed and delay of the main rod of the spring is controlled.