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Replacement technique of centrifuge rotor in laboratory

2022-10-17 Hits: 22 views

If the centrifuge is not used properly in the laboratory, the rotor will not be taken out and the experiment process will be delayed. Generally, the rotor can not be taken out from the centrifugal cavity, which is mainly caused by the adhesion between the spring chuck and the centrifuge motor spindle. According to years of experience in using centrifuges, during centrifugation, condensate water or carelessly spilled liquid may permeate between the spindle and the central hole of the rotor. After centrifugation, if the spring collet is not pulled out quickly and is used continuously for a long time, corrosion and adhesion will occur between the spindle and the spring chuck, resulting in the operator being unable to take out the spring Chuck. This phenomenon is more likely to occur in high-speed refrigerated centrifuge. Here are some ways to solve this problem.

1. Simplified method

First, screw out the original locking screw and screw it into the thread hole of the main shaft with a screw of the same thread specification. Pay attention not to screw in the end completely. With the cooperation of two people, one person holds the rotor with both hands and raises it slightly upward. Pay attention not to use too much force to avoid deformation of the motor support frame. The other person uses a hammer to knock down the screw on the upper part of the motor spindle through a thin rod. After repeated several times, the rotor can be separated from the main shaft.

2. Special tool method

If the method mentioned above fails to take out the rotor, it indicates that the bonding condition is serious. The rust remover can be dropped into the joint of the main shaft and the rotor for rust removal and infiltration. After waiting for a day or so, use a special puller to take out the rotor. In the same way, first, select the appropriate size of the puller according to the size of the rotor, and then buckle the puller’s hand to the bottom of the rotor. The head of the screw rod of the puller is against the screw in the thread hole of the main shaft. After the position of the puller is righted, the screw rod is rotated clockwise with a wrench. According to the principle of screw mechanism, the puller’s hand will produce a huge pulling force, and then the rotor will be removed from the main shaft be divorced from.

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