Ball Screw Axial Clearance Measurement with Posture Correction
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Solution Overview
Problem
Existing methods for measuring axial clearance in ball screw devices are prone to measurement errors due to posture deviations like eccentricity and inclination, requiring precise alignment and significant time and labor, making them unsuitable for mass production and automation.
Innovation Solution
A method and apparatus that apply a load in opposite directions along the axial direction to measure displacement, while allowing for relative displacement and posture correction in two translation directions and two rotational directions perpendicular to the axial plane, ensuring accurate measurement without special attention or precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If precise alignment and attachment of nut and screw shaft are required to eliminate eccentricity and inclination, then measurement accuracy is improved, but time and labor consumption increases
Solution Approach 1:
A posture correction mechanism is introduced as an intermediary device between the measurement system and the ball screw device. This mechanism automatically corrects eccentricity and inclination during measurement, eliminating the need for manual precise alignment while maintaining high measurement accuracy
Solution Approach 2:
The measurement apparatus is designed to automatically correct its own alignment issues through the posture correction mechanism. The system self-adjusts to eliminate eccentricity and inclination without requiring external manual intervention for precise attachment, thereby reducing both time and labor
2Measurement precision
If precise attachment without eccentricity or displacement is required, then measurement accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The posture correction mechanism serves as an intermediary that handles the complex alignment corrections automatically. This allows operators to simply attach the ball screw device without needing to manually achieve precise alignment, significantly improving ease of operation while maintaining measurement accuracy
Solution Approach 2:
The measurement system incorporates dynamic posture correction capabilities that automatically adjust during the measurement process. This dynamic adjustment eliminates the need for static precise attachment, making the operation simpler while maintaining accuracy throughout the measurement
3Measurement precision
If manual alignment and attachment procedures are used, then measurement accuracy is improved, but productivity decreases
Solution Approach 1:
The automated posture correction mechanism acts as an intermediary that eliminates time-consuming manual alignment procedures. By automatically correcting eccentricity and inclination, the system enables rapid measurement setup, significantly improving productivity while maintaining measurement accuracy
Solution Approach 2:
The system replaces manual mechanical alignment procedures with an automated posture correction mechanism. This substitution eliminates the need for operators to manually adjust and align components, thereby increasing measurement speed and productivity while maintaining accuracy through automated correction
Data Source
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AI summary
An apparatus of measuring axial clearance of a ball screw device is capable of measuring axial clearance with high accuracy by easily attaching a ball screw device to be measured without requiring special attention. This apparatus includes a support unit that supports a nut as one member of the nut and a screw shaft threadedly engaged with each other, a measuring unit that measures a displacement amount of the screw shaft as the other member in an axial direction, a load applying unit that applies a load to the screw shaft in directions opposite to each other along the axial direction, and a posture correction unit that is provided between the screw shaft and the load applying unit to hold the nut and the screw shaft to be relatively displaceable.