Centrifuge imbalance detection system and method

Abstract

The invention discloses a centrifuge imbalance detection system and method. The centrifuge imbalance detection method comprises the steps: a three-axis digital accelerometer detects the vibration acceleration of a centrifuge from start-up to stable operation; an MCU periodically reads vibration acceleration values of the three-axis digital accelerometer and transmits the vibration acceleration values to an analysis module through an acquisition module; the analysis module analyzes the maximum acceleration value from the received vibration acceleration values, and transmits the maximum acceleration value serving as a vibration set threshold value to the MCU through the acquisition module; the MCU writes the vibration set threshold value into the three-axis digital accelerometer; the three-axis digital accelerometer analyzes whether the detected vibration acceleration values exceed the vibration set threshold value or not, and when the detected vibration acceleration values exceed the vibration set threshold value, an alarming signal is sent to the MCU; and the MCU controls an alarm to give an alarm after receiving the alarming signal. The new centrifuge imbalance detection system has the self-management capability, CPU resources are freed up to a certain extent, the cost is lowered, and meanwhile higher real-time performance, accuracy and flexibility are achieved.

Description

technical field [0001] The invention relates to the technical field of centrifuge unbalance detection, in particular to a centrifuge unbalance detection system and method. Background technique [0002] The centrifuge, because of its high-speed operation, requires its load (centrifuge cup or test tube) to be placed symmetrically, otherwise it will cause severe vibration due to eccentric load, resulting in machine damage or personal injury. The unbalance detection system judges the symmetry of the current load by collecting vibration acceleration values ​​during the operation of the centrifuge. The structure of the existing centrifuge unbalance detection system is as follows: figure 1 As shown, ADXL78 is a single-axis analog accelerometer. The MCU periodically reads the acceleration value (analog signal) through the AD interface. When the values ​​read N times in a row exceed the vibration acceleration threshold, the centrifuge is considered to be in an unbalanced load state....

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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