A linear rolling guide pair straightness error measurement system

By using dynamic background noise modeling and reflection suppression algorithms, combined with a dust compensation module, the problem of traditional straightness measurement being susceptible to interference from dust and reflections is solved, achieving high-precision and efficient straightness error measurement and meeting the measurement needs of industrial environments.

CN120868976BActive Publication Date: 2026-07-24LISHUI QUALITY INSPECTION & TESTING RES INST
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Patent Information

Application Number
CN202510781543.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-06-12
Publication Date
2026-07-24
Estimated Expiration
2045-06-12

AI Technical Summary

Technical Problem

Traditional methods for measuring straightness error are susceptible to dust contamination and environmental reflection interference, leading to a decrease in measurement reliability and accuracy, making it difficult to achieve high-precision measurements in industrial environments.

Method used

By employing dynamic background noise modeling and real-time reflection suppression algorithms, combined with a dust compensation module, a dust detection threshold is set by the average gray value of the annular area around the light spot. A weight matrix is ​​used to shield the dust-occluded area, thereby achieving accurate calculation of the centroid coordinates.

Benefits of technology

The measurement error is reduced by 80% in an environment with a dust concentration of 5 mg/m3, and the error is less than 2 μm in a highly reflective environment. It meets the measurement accuracy of ±1 μm and the dynamic measurement requirements of high-speed guide rails, and significantly improves the anti-interference capability of the measurement system.

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Abstract

The application relates to the field of linear rolling guide rails, and discloses a linear rolling guide rail pair straightness error measuring system, which comprises a workbench, a laser interferometer is fixedly connected to the top of the workbench, a measured guide rail is fixedly connected to the top of the workbench, a concave frame is slidably connected to the top of the measured guide rail, and a CCD camera, a light splitting prism and a moving target are arranged on the concave frame. The modular architecture of light source emission, light splitting, reflection receiving and data processing is adopted, and each module is precisely coordinated: the laser interferometer provides a stable reference light path, the light splitting prism constructs a high-precision interference light path, the CCD camera realizes sub-pixel level light spot collection, the data processing module realizes real-time calculation of straightness errors through a gray weighted centroid method and a least square method, the dynamic measurement demand of a high-speed guide rail (2 m / s) is met, the calculation efficiency and the precision reach an industry leading level, and a reliable solution is provided for online detection and processing process control of the precision guide rail.
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