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Failure analysis of medical centrifuge
Author: BLLA Published: 2012-11-1 Visits: 2386


Medical centrifugal equipment is an indispensable and important equipment in today's life chemistry research centers. How to ensure the safe operation of the instrument and exert its full performance is a major concern for technicians. However, there are always accidents with centrifuges due to improper use of the instrument and failure to maintain it regularly and other reasons. In order to improve the utilization rate and extend the service life of the instrument, to ensure the safe operation of the instrument and avoid accidents, the technicians of Bo Yi summarized the relevant causes of the laboratory centrifuge accident and analyzed, and explained the main points of laboratory centrifuge maintenance.

According to the traditional theory, the failure of the medical centrifuge is caused by the excessive imbalance of the rotor, and the weighing error of the sample, the overflow of the centrifuged sample liquid during the centrifugation process, and the corrosion of the rotor are the main factors that cause the imbalance of the rotor.

The main reasons are as follows:

1 . 0 When the medical centrifuge tube was balanced, the balance of the centrifuge tube placed symmetrically exceeded 0 due to the long-term use of the balance without calibration . 1g 1 to 1g .

2 When loading a medical centrifuge tube, the sample tube is full or the centrifuge tube cap is not tightly sealed. During the centrifugation process, the high vacuum state in the centrifugal chamber caused the centrifuge tube to flatten, rupture, and overflow the sample liquid, causing the rotor to become unbalanced. A shaft bending or broken shaft accident occurred.

3 Because the specific gravity of the original sample was not equal to the specific gravity of the balancing fluid, the rotor was out of balance and an accident occurred.

4 . When the horizontal rotor is used, the serial number of the bucket is not carefully installed with the serial number of the horizontal rotor body, which affects the dynamic balance of the rotor.

5 . An aluminum alloy centrifuge cap is mixed with a stainless steel centrifuge cap (the specific gravity of the two is different) and an accident occurs.

6 . 使用干燥箱烘烤)等处理而老化龟裂、失去密封作用等, 使样品在高速运转时外溢,从而使转子在不平衡状态下运行。 The rubber seal ring in the centrifuge tube cap and the rotor cover rubber seal ring are improperly used and sterilized improperly, such as long-term internal cracking and high-temperature sterilization using a drying oven to bake) and other treatments, such as aging cracks, loss of sealing, etc., so that the sample runs at high speed Time overflow, so that the rotor runs in an unbalanced state.

7 . For centrifuge tubes of various materials, the scope of use and disinfection methods of centrifuge tubes required by the manufacturer were not well understood before use. Chemical solvents and inappropriate disinfectant solutions were used to cause the centrifuge tubes to swell and rupture during operation. accident.

8 .Due to carelessness during the work, the rotor cover was not tightened or the rotor cover and rotor handle were interchanged, causing the screws to mismatch. When the machine was turned on, the rotor cover was thrown out and a serious shaft breakage accident occurred .

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