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The centrifuge is one of the commonly used experimental equipment in the laboratory. The installation of the centrifuge plays a key role in the service life of the centrifuge. Today I will summarize the precautions for the installation of the laboratory centrifuge.
1. Correct installation
(1) Power supply voltage: The voltage fluctuation must meet the national standard within 10%, otherwise the centrifuges of some manufacturers cannot operate normally. If the voltage fluctuation is above this, it is recommended to use a voltage regulator to meet the grid.
(2) The ground wire should be firm: the wiring of the power supply of the room should meet the requirements. China's three-phase four-wire system. Three-phase is the three phases in industrial power. When using three-phase power, 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 wire should be reliable to avoid leakage. The ground wire cannot be connected to the hot gas pipe or 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 is working properly, and not to sink into the ground. The ground at the fixed place should be flat and firm.
(4) Find a good level: find the correct small level, open the centrifuge lid, find the level on the main shaft, and find the level by adjusting the twisting of the adjustment bolts next to the 4 casters. Pay attention that one of the feet cannot be missed.
2. Find balance by loading samples
During the design and manufacture of the centrifuge, the unbalance caused by the processing error of the rotor has been remedied by the dynamic balance test. However, all centrifuges have their agreed loading imbalance.
In order to compete with other manufacturers on the maximum unbalance limit allowed by the centrifuge, the centrifuge manufacturers try to give a larger value. At this larger value, the centrifuge can run, but the unbalanced force generated at this time suddenly hits the bearing and the bracket at a frequency of n times per minute, and the centrifuge is damaged. Therefore, users should try to find a good balance for those expensive centrifuges, which is good for the life of the centrifuge.
3. Clean up the accumulated water in the centrifugal cavity
Refrigeration is used when the centrifuge is running. Due to the moisture of the air, frost forms in the centrifuge chamber, and the frost turns into water after shutdown. Most low-speed large-capacity centrifuges abroad have no drain holes, and the more water accumulates in the centrifuge chamber. At this time, the user should remove the rotor to clean up the water. When reinstalling the rotor, it must be installed to avoid accidents.
4. Aluminum alloy cannot be corroded
The rotor of the centrifuge is generally made of aluminum alloy. When it is corroded, its strength decreases and it is easy to lose the accident. Aluminum alloys are susceptible to liquid corrosion. After cleaning, use a blower to dry them, or invert them for a period of time to confirm that they are dry before they can be used. Some blood stations import centrifuges, but the 6 plastic trays in the 6 aluminum cups are not. The blood bag should be placed in the plastic tray, and should not be placed directly in the aluminum cup. Pay attention to the test tube for cracks. If the test tube (especially the test tube used repeatedly) has cracks, it must not be used. Otherwise, the test tube rupture during use will cause the rotor to lose its balance during rotation, which may cause malignant accidents such as broken shafts.
5. Shaft broken accident
The rotor is not installed properly, or the unbalanced sample is too large, the centrifuge starts. Although modern imported centrifuges have unbalance protection, that is, when the unbalance amount exceeds a certain limit, the power should be automatically cut off to stop the centrifuge. But under the above circumstances, it is already too late and there will be vicious accidents. One of the malignant accidents is shaft breakage. Due to the shaft breakage suddenly during high-speed rotation, the centrifugal rotor has no support, and the random rotation and collision in the centrifugal cavity can make the whole centrifuge rotate by 270 °. At this time, if there are staff or equipment next to them, it will cause staff casualties and damage to the equipment.
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