Pneumatic protection device and its working method for triaxial air-bearing turntable
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Solution Overview
Problem
Triaxial air-bearing turntables face issues where the test platform deviates beyond set angles during pitch or roll, potentially tilting and touching the ground, and there are scratches when separating the air bearing seat and hemisphere without an air source.
Innovation Solution
A pneumatic protection device with a position limiting ring, lifting support rods, a cylinder, and an irregular cam prevents the test platform from exceeding set deflection angles by using high-pressure gas lubrication and a cam mechanism to separate the air bearing hemisphere from the seat after the experiment, avoiding contact and scratches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the test platform is allowed to pitch or roll freely on the triaxial air-bearing turntable, then the motion freedom is improved, but the test platform may deviate beyond the set angle and touch the ground, causing damage
Solution Approach 1:
The position limiting ring is pre-positioned at a predetermined location to define the maximum deflection angle before any pitch or roll motion occurs. This preliminary positioning prevents the test platform from exceeding safe angular limits during execution mechanisms operation, thereby maintaining both motion freedom and platform stability.
Solution Approach 2:
The position limiting ring acts as an intermediary mechanical element between the test platform and the ground. It provides physical contact at a predetermined angular position, serving as a mediator that stops the platform's motion before it can tilt excessively and touch the ground, thus protecting the platform while allowing full motion freedom within safe limits.
2Device complexity
If the air bearing seat and air bearing hemisphere are separated without an air source, then the device complexity is reduced, but scratches occur during separation
Solution Approach 1:
The lifting support rod is pre-positioned to provide support before separation occurs. When the air source is removed, the lifting support rod automatically moves upward due to the cam mechanism, preliminarily supporting the air bearing hemisphere and preventing direct contact between the air bearing seat and hemisphere during separation, thus avoiding scratches while simplifying the device by eliminating continuous air source requirement.
Solution Approach 2:
The lifting support rod serves as an intermediary mechanical support between the air bearing seat and the air bearing hemisphere during separation. It temporarily carries the load and maintains separation, preventing harmful direct contact and friction that would cause scratches, while allowing the system to operate without an air source during certain phases.
3Force
If the air bearing hemisphere contacts the air bearing support seat without air lubrication, then the friction increases, but wear and scratches occur
Solution Approach 1:
The lifting support rod acts as an intermediary that prevents direct contact between the air bearing hemisphere and the air bearing support seat when air lubrication is unavailable. It bears the contact force and separates the two surfaces, eliminating friction wear and scratches that would occur during direct contact in the absence of air lubrication.
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
The solution effectively limits deflection angles during testing and ensures non-contact separation of the air bearing components, preventing scratches and maintaining a frictionless state without an air source, thus enhancing the operational safety and reliability of the triaxial air-bearing turntable.
Implementation Method 1
an air bearing support seat...provides high-pressure gas lubrication to make the air bearing hemisphere freely roll and rotate
Implementation Method 2
two needle roller bearings connected to two first lifting support rods roll on the irregular working surface of the irregular cam
Data Source
AI summary
A pneumatic protection device for a triaxial air-bearing turntable and its working method are provided. The position limiting ring is located below the test platform and surrounds the air bearing hemisphere. Two first lifting support rods are connected below the position limiting ring, and each first lifting support rod is guided up and down, sliding on the linear bearing, which is fixed on the support frame. The lower part of the first lifting support rod is connected to the bearing mounting seat, and the bearing transmission shaft passes through the needle roller bearing. The two sides of the cylinder support bottom plate are connected and fixed on the support frame by connecting plate of a cylinder bottom plate. One end of the extending rod of the cylinder is connected to the cam connecting rod, and the two ends of the cam connecting rod are respectively connected to an irregular cam.