Centrifuge imbalance detection system and method

Abstract

The invention discloses a centrifuge unbalance detection system and method. A three-axis digital accelerometer detects the vibration acceleration of the centrifuge from startup to stable operation; an MCU periodically reads the vibration acceleration value of the three-axis digital accelerometer and It is transmitted to the analysis module through the acquisition module; the analysis module analyzes the maximum acceleration value from the received vibration acceleration values, and transmits the maximum acceleration value as the vibration setting threshold to the MCU through the acquisition module; the MCU sets the vibration setting threshold Write it into the three-axis digital accelerometer; the three-axis digital accelerometer analyzes whether the detected vibration acceleration value exceeds the vibration set threshold, and sends an alarm signal to the MCU if it is; the MCU controls the alarm to send alarm. The new centrifuge unbalance detection system has self-management capabilities, liberates CPU resources to a certain extent, reduces costs, and has higher real-time performance, accuracy, and flexibility.

Description

Technical field[0001]The present invention relates to the field of centrifuge imbalance detection techniques, and more particularly to a centrifuge imbalance detection system and method.Background technique[0002]The centrifuge, due to its high speed operation, requires its load (centrifugal cup or test tube) to be placed, otherwise it will cause severe vibration due to the bias supply, resulting in machine damage or personal injury. The imbalance detection system is to determine the symmetry of the current load by acquiring the vibration acceleration value during the operation of the centrifuge. Existing centrifuge imbalance detection system structurefigure 1 As shown, the ADXL78 is a single-axis analog accelerometer, and the MCU is readily read the acceleration value (analog signal) via the AD interface. When the value of continuous N reads exceeds the vibration acceleration threshold, it is considered that the centrifuge is in a biased state. The centrifuge issues alarm informatio...

AI Technical Summary

Problems solved by technology

Because the vibration detection system uses analog signals, the CPU needs to have a higher acquisition rate, but the CPU is also responsible for other control tasks such as frequency conversion, and the priority of frequency conversion control is the highest, so the acquisition rate of vibration signals cannot be greatly increased.

At the same time, based on the motion characteristics of the centrifuge, its vibration acceleration value changes sinusoidally with the rotational speed. When the sampling rate is too low, the acquisition of peaks and troughs will be missed, resulting in inaccurate vibration alarm judgments.

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