If the centrifuge is not used properly in the laboratory, it will cause the rotor to not get out and delay the experimental process. Generally, it is impossible to pull back from the centrifugal chamber, mainly because of the adhesion between the return and the main shaft of the centrifugal motor. According to years of experience with centrifuges, there may be condensate or inadvertently sprinkled liquids intoxicated between the spindle and the center hole of the turning head during the centrifugal process. When the centrifuge is over, if the turning head is not pulled out in a tight time, continuous use of a long period of time, corrosion and bonding will occur between the spindle and the turning head, eventually resulting in The operator has no way to take it back. These phenomena are more likely to occur on high speed refrigerated centrifuges. Here are some ways to solve this problem.

1. simple method

Firstly, the original locking screw is screwed out, and a screw with the same thread specifications is screwed into the spindle thread hole. Be careful not to screw in the end completely. Two people cooperate, one hand holding back slightly mentioned upward, pay attention to not too hard, so as to avoid the deformation of the motor support frame, the other hammer through a thin rod down the motor shaft screw. After repeated several times, you can usually turn away from the main shaft.

2. special tool method

If the above method can not be taken back, indicating that the bonding situation is serious. Rust remover and wetting can be first dripped into the main shaft and back joint part. After waiting for a day or so, use a special puller to take it out and look back. Similarly, first select the right size of the puller according to the size of the back, and then pull puller puller puller puller pull hand buckle back at the bottom of the head, puller screw head against the screw in the spindle threaded hole, will pull puller position after the center, with a wrench clockwise rotation of the screw, according to the screw mechanical principle, puller pull-out hand will produce A huge pull will then turn away from the spindle.

3. pay attention to the essentials.

(1) In any case, a replacement screw must be inserted in the threaded hole of the spindle to protect the spindle thread and the original locking screw.

Otherwise, if the original thread is damaged, the motor may be scrapped.

(2) force yourself to understand your sense of propriety and not brute force. When the resistance is too high, the time of rust removal and wetting can be prolonged.

(3) Return to take out, to use fine sandpaper grinding spindle surface and return hole surface, rust removal, grease, prevent the occurrence of bonding again.

4. precautionary measures

(1) to enhance the maintenance of weekdays, clean the surface of the joint with the spindle and grease.

(2) Especially high-speed refrigeration centrifuge, do not close the door immediately after use, should let the moisture, condensate, corrosive gas evaporation in the centrifugal chamber, return to normal temperature, and then close the door.

(3) when centrifuges are centrifuged, they must take the time to take them back. If there is a continuous succession, many days do not swap out, it is easy to occur adhesion. In the most serious case, the whole machine will be scrapped.

(4) Each time the screw is tightened, the force should not be too strong, or it will be manufactured into screw slippage, serious will be manufactured into motor scrap. Because the motor usually rotates counterclockwise, when accelerating, because the inertial screw itself will produce a clockwise tightening force, just can make the return can be tightened, so tighten the back, only the wrist feels slightly laborious.