Main Spindle Rotary Joint Layout for Easier Seal Replacement
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Solution Overview
Problem
The existing rotary joint in machine tool main spindle devices is cumbersome for seal member replacement due to its large dimensions, making it difficult to access and replace seal members, especially on the rear side, which complicates the maintenance process.
Innovation Solution
The rotary joint is configured with a first and second rotary joint part, where the first part has a shaft-shaped distributor and a cylindrical shaft, and the second part has a cylindrical distributor and a shaft-shaped component, allowing for easier access and replacement of seal members by removing the first distributor and pulling out the second distributor for external replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotary joint has a large dimension in the axis line direction to accommodate the distributor and shaft, then the seal member can be provided effectively, but it becomes difficult for a hand to reach the seal member located on the end portion side, making replacement very difficult
Solution Approach 1:
The rotary joint is divided into a first rotary joint part (with shaft-shaped distributor and cylindrical shaft) and a second rotary joint part (with cylindrical distributor and shaft-shaped component). This segmentation allows the first distributor to be removed independently to access front seal members, while the second distributor can be pulled out for external access to rear seal members, solving the accessibility problem without compromising seal functionality.
Solution Approach 2:
The invention enables extraction of the first distributor from the frame to access front seal members, and extraction of the second distributor from the first distributor to access rear seal members externally. This taking out approach transforms the inaccessibility problem into a solvable maintenance procedure by allowing sequential removal of distributor components.
2Ease of repair
If the shaft is removed from the frame to enable seal member replacement, then the seal member can be accessed, but in addition to removing the distributor, an operation of removing the shaft and attaching it back is required, making the operation extremely complicated and time-consuming
Solution Approach 1:
The rotary joint is segmented into two independent parts with distinct distributor-shaft configurations. This segmentation allows maintenance personnel to remove only the necessary distributor component (first or second) without needing to remove the shaft from the frame, thereby reducing replacement operation complexity while maintaining full seal member accessibility.
Solution Approach 2:
The invention introduces dynamic maintenance capability where the extent of disassembly is adjusted based on which seal member needs replacement. Front seal members require only first distributor removal, while rear seal members require second distributor removal, optimizing the maintenance process dynamically rather than requiring complete shaft removal in all cases.
3Ease of repair
If the distributor is made removable from the frame to facilitate seal member replacement, then the seal member can be replaced by removing the distributor, but the rotary joint occupies the majority of the device in the axis line direction, making it difficult to reach rear seal members
Solution Approach 1:
The rotary joint is divided into two parts with different geometric configurations. The first part has a shaft-shaped distributor that can be removed for front seal access, while the second part has a cylindrical distributor that can be pulled out for rear seal access. This segmentation enables effective seal member replacement without requiring the rotary joint to occupy excessive space in the axis line direction.
Solution Approach 2:
The invention utilizes different spatial configurations for the two rotary joint parts. By making the second distributor cylindrical rather than shaft-shaped, it can be pulled out in a different dimensional direction, providing external access to rear seal members without increasing the overall axis line dimension of the rotary joint assembly.
Data Source
AI summary
A main spindle device for a machine tool including a rotary joint configured by a distributor fixedly provided to a frame and a shaft provided to be non-rotatable to a main spindle. The rotary joint is configured by a first rotary joint part and a second rotary joint part that are continuous in an axis line direction of a main spindle. The first rotary joint is the other end side of the frame and is configured by a first distributor having a shaft shape and a first shaft having a cylindrical shape, and the second rotary joint is configured by a second distributor having a cylindrical shape and a second shaft having a shaft shape.