Screw Rod Support for Long Stroke Assemblies
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Solution Overview
Problem
Screw rods in longer stroke screw and nut assemblies tend to deform, leading to constrained critical rotating speed and noise due to unsmooth movement, and existing support solutions either reduce movable stroke or are expensive, such as pneumatic/hydraulic pressure-driven designs.
Innovation Solution
A screw and nut assembly with a movable platform, two screw and nut sets, and a driving mechanism that allows the second screw nut and first screw nut to move in the same direction, supported by first and second supports affixed to the second screw rod, enabling adjustable gap between supports and reducing stroke constraints, while being less expensive than conventional pneumatic or hydraulic designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If support means are provided at the bottom side of the screw and nut set to support the screw rod, then screw rod deformation is reduced, but the movable stroke is reduced due to the constant gap between supports and screw nut
Solution Approach 1:
The support means are designed to move together with the screw nut along the screw rod, maintaining a dynamic position rather than a fixed position. This allows the gap between the support means and screw nut to change during operation, reducing the effective movable stroke. The support means include movable support structures that can translate along the screw rod while maintaining contact or proximity to the screw rod for continuous support.
2Length of moving object
If pneumatic or hydraulic pressure-driven designs are used to control support positions, then stroke constraints are reduced, but the system becomes much more expensive
Solution Approach 1:
The support means utilize the motion of the screw nut itself to achieve positional adjustment. As the screw nut moves along the screw rod, the support means are carried along with it, automatically adjusting their position without requiring external pneumatic or hydraulic systems. This self-adjusting mechanism eliminates the need for expensive pressure-driven actuators while maintaining the ability to support the screw rod at appropriate positions throughout the stroke.
3Reliability
If the gap between support and screw nut is kept constant, then screw rod is well supported, but the movable stroke is relatively reduced
Solution Approach 1:
The support means transition from a static, fixed-gap design to a dynamic design where the gap can vary. The support means are mounted on structures that can move relative to the main body, allowing the distance between the support and screw nut to change as the system operates. This dynamic configuration maintains reliable support when needed while permitting greater overall stroke than a fixed constant-gap design would allow.
Data Source
AI summary
A screw and nut assembly includes a movable platform, a first screw and nut set with the first screw rod affixed between two locating members and the first screw nut pivotally mounted in the movable platform, a second screw and nut set with the second screw nut pivotally mounted in the movable platform, a driving mechanism for driving first screw nut and the second screw nut simultaneously for causing the first screw nut to create a first speed and the second screw nut to create a second speed slower than and reversed to the first speed, and a first support and a second support respectively affixed to the second screw rod to support and to move with the second screw rod. Thus, the gap between the movable platform and each support is changed subject to movement of the screw nuts.