Rotary Table Joint Structure for O-Ring Twist-Free Sealing
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Solution Overview
Problem
Conventional rotary joints for rotary table assemblies face issues with long insertion distances causing torsional deformation of sealing O-rings and the inconvenience of attaching and replacing seals due to the axial length and thinness of the shaft and distributor.
Innovation Solution
The rotary table assembly design separates the center shaft into two components, allowing for reduced insertion distance and easier access for seal replacement, with a hollow cylindrical structure and axial separation of the shafts to prevent torsional deformation of sealing members and facilitate their attachment and replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the shaft is inserted from the back surface side of the rotatable table, then the rotary joint can be assembled, but the sealing O ring becomes torsionally deformed and may not prevent foreign matter entry
Solution Approach 1:
The shaft is inserted from the front surface side of the rotatable table instead of the back surface side. This reverses the conventional insertion direction, allowing the O ring to be positioned near the frame side where it can be properly compressed between the shaft and the through hole peripheral surface without torsional deformation during insertion.
2Reliability
If the shaft and distributor are axially long and thin, then the rotary joint can function properly, but the rotational seals cannot be easily accessed for attachment and replacement
Solution Approach 1:
The shaft is divided into multiple axial sections with different diameters. The first axial section has a larger diameter than the second axial section, creating a stepped structure. This segmentation allows the rotational seals to be positioned at accessible locations where operators can reach them for attachment and replacement, while still maintaining the necessary axial length for proper sealing function.
Data Source
AI summary
A rotary table assembly is configured to prevent torsional deformation of a sealing member on an outer peripheral surface of a rotary joint. The rotary joint has a distributor and a center shaft, which includes two hollow cylindrical center shafts respectively inserted into a through hole from opposite front and back surface sides of a rotatable table. The sealing member makes contact with the outer peripheral surface of the hollow cylindrical center shaft positioned near the front surface of the rotatable table. The distributor has a top region that is successively inserted from the back surface side of the rotatable table into the two hollow cylindrical center shafts, and a basal portion secured to a frame.