Electric centrifuge is one of the conventional biochemical instruments in the research, education and production departments of biology, chemistry and medicine. In the process of using an electric centrifuge, there are a few things that we need to pay attention to: First, the correct installation (1) Power supply voltage: The voltage fluctuation should meet the national standard within +10%. Otherwise, some manufacturers' centrifuges cannot operate normally. If the voltage fluctuation is above this, it is recommended to use a voltage regulator to comply with our power grid. (2) The ground wire should be firmly: the wiring of the power supply in the room should meet the requirements. China is a three-phase four-wire system. The three-phase is the three-phase in industrial power. When three-phase electricity is used, the neutral line is separated from the ground line. More importantly, whether it is three-phase industrial power or general single-phase power, the ground line should be reliable, so as to avoid Leakage, ground wire can not be connected to the heating pipe and the water pipe. (3) The ground should be flat and firm: for large centrifuges, the floor should be firm at the installation site to ensure that the rotor of the centrifuge works normally, not recessed, and the ground at the installation site should be flat and firm. (4) Find the level: open the lid of the centrifuge, use a relatively small level to find the level on the spindle, and adjust the screwing of the adjusting bolt next to the four casters to find the level. Note that one of the feet cannot be lost. . Second, the sample to find balance In the design and manufacture of the centrifuge, the imbalance caused by the machining error of the rotor has been remedied by the dynamic balance test. As long as it is a centrifuge, it has an allowable unloading amount. Centrifuge manufacturers strive to give larger values ​​in order to compete with other manufacturers on the maximum unbalance limit allowed by the centrifuge. At this larger value, the centrifuge can be operated, but the imbalance force generated at this time suddenly hits the bearing and the bracket at n times per minute, causing the centrifuge to be damaged. Therefore, for those expensive centrifuges, we should try to find a good balance and then centrifuge, which is good for extending the life of the centrifuge. Third, clean up the water in the centrifugal cavity When the centrifuge is running, it uses refrigeration. Because of the moisture in the air, it is frosted in the centrifugal chamber, and then frosted into water after being stopped. Most foreign low-speed large-capacity centrifuges have no drainage holes, and the water in the centrifugal chamber is more and more accumulated. At this time, we should remove the rotor and clean up the water. When reinstalling the rotor, be sure to install it to avoid accidents. Fourth, aluminum alloy can not be corroded Centrifuge rotors are generally made of aluminum alloy, which, when corroded, have reduced strength and are prone to accidents. Aluminum alloys are susceptible to liquid corrosion, so use a blower to dry them after cleaning, or invert them for a while, and confirm that they are dry before reuse. There should be 6 plastic trays in the 6 aluminum cups of the blood station inlet centrifuge. At this time, it should be noted that the plastic tray is a blood bag, and it is necessary to avoid placing the blood bag directly in the aluminum cup. Five, broken shaft accident Note the test tube for cracks. If the test tube (especially the test tube used repeatedly) has cracks, it must not be used. Otherwise, the tube rupture during use will cause the rotor to lose balance during rotation, causing a vicious accident such as broken shaft. Although the current imported centrifuges have unbalanced protection, that is, when the unbalanced amount exceeds a certain limit, the automatic shutdown should be performed to stop the centrifuge. However, in the case where the rotor is not placed properly, or the centrifuge is started when the sample imbalance is too large, it is too late and a serious accident may occur. One of the malignant accidents is the broken shaft. Due to the sudden breaking of the shaft during high-speed rotation, the centrifugal rotor has no support, and the centrifugal machine is turned into a chaotic collision, which can make the centrifuge rotate the machine to a 270° angle. At this time, if there are people or equipment next to it, it will cause casualties and damage to the equipment. 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