1.1 The temperature refrigeration.
When the rotor rotation speed, cast bronze air friction and heat, the rotor temperature will rise in the temperature of the sample tube will be increased. Because of temperature-sensitive biological samples.
General requirements for centrifuge experiments with temperature 4 ℃. No computer-controlled intelligent technology,bronze bushing it is impossible to achieve ± 1 ℃ accuracy. Thus, the centrifugal chiller cooling chamber, and to cool the rotor, cooling the sample temperature. But the measurement of the actual rotation of the rotor temperature is extremely difficult,dry bushing at home and abroad have adopted from the bottom of the centrifuge rotor chamber temperature sensor close to treatment facilities, indirect measurement of rotor temperature. Chamber where T sample = T + T compensation. T compensation and the type of rotor,plain bearing speed and running duration.
1.2 The direct-drive brushless motor.
Centrifuge is a high-speed motor with rotor rotation. Brushless motor is the past with the DC motor, carbon brush wear centrifuges running, bring sparks and noise or vibration, and there is life, everything will have to replace the carbon brush run again.sleeve bushing More serious is the carbon brush wear caused toner dust pollution, not only pollute the centrifuge, but also polluted the environment, this pollution on the health sector is not appropriate.
1.3 shows the digital technology.
The typical form of simulation technology for the screw knob to select the operating parameters (such as speed,DU bushing temperature and time) to the dial pointer to display data. The downside is: to select parameters and data readings and the readings by the operator's human disturbance and more poor control accuracy. And each operation must be so poor reproducibility. Although the figures show some of the centrifuge (such as knob to select a value and digital display),bushing although there are improvements in reading, but the value remains unchanged principles simulation techniques; figures show the typical form of the friendly interface, keyboard, digital display , programmable computer controlled operation, the core of the intelligent control is achieved by a computer. All the parameters required to operate the centrifuge (such as speed, temperature, time, addition and subtraction rate files, etc.), keyboard input, and digital display, so choose the number of operating parameters and the read error is minimal. Also,brass bushing because the operation is programmable, can be compiled into a set number of operating parameters can be accessed using the.
2, the safe use of centrifuges.
2.1 correctly installed.
(1) Supply voltage: voltage fluctuations within +10% to meet the national standard, or a number of manufacturers of centrifuges is not running.Mould guide plate If the voltage fluctuations in the above recommended regulator for the meet this grid.
(2) ground to prison: the power of the wiring room to meet the requirements. China is a three-phase four-wire system. Three-phase industrial power in the three-phase, three phase power line and separated from ground zero,plasic bushing more importantly, whether it is three-phase industrial power Ye Hao, Ye Hao general single-phase, ground should be reliable in order to avoid leakage , ground is not connected to the heating pipe, water pipe.
(3) The floor should be smooth, firm: large-scale centrifuge run, moving the floor at the installation site should be strong, to ensure normal operation of centrifuge rotors, not into the pouch, installation should be fixed at the ground level and firm.
(4) to find a good level: the level to find a more accurate small scale, the centrifuge lid open, looking at the spindle level, by adjusting the four caster adjustment bolts next twist came to a good level of attention which a foot can not dashed.
2.2 The sample loading to find balance.
When in the design and manufacture of centrifuge, the rotor imbalance caused by processing errors, has made a dynamic balance test of the remedies, but any centrifuges, has its permitted sample loading unbalance. Centrifuge Centrifuge manufacturers in order to limit the maximum allowed imbalance indicator compete with other manufacturers, try to give a larger value. In this larger value, the centrifuges can operate, but when unbalanced force generated by n times the frequency per minute and suddenly the impact of bearing bracket, the centrifuge is subject to damage. Therefore, users of those expensive centrifuges, try to find a good equilibrium centrifugation, the centrifuge good life.
2.3 cavity clean water centrifugation.
The use of refrigeration centrifuge operation, due to air moisture, frost in the centrifugal chamber, after the frost down into the water. Most low-speed large capacity centrifuge abroad, there is no drainage hole, the more centrifugal chamber volume of water more. At this point, the user should remove the rotor itself, clean water. When you reinstall the rotor, must be installed properly to prevent accidents.
2.4 is not affected by corrosion of aluminum alloy.
Centrifuge rotor generally is aluminum, when the strength decreased by corrosion, easy to accidents. Susceptible to corrosion of aluminum alloy liquid, after the application of hair dryer dry cleaning, or inverted for some time, make sure to use dried. Some imported blood bank centrifuge, 6 6 aluminum plastic cup should not care. Care should be put in plastic bags, to avoid directly on the aluminum cup. Note tube cracks. If the tube (especially the repeated use of the test tube) has cracks, must not use, or test-tube rupture in use in the rotor will cause loss of balance, can lead to fatal accidents such as broken shaft.
2.5 broken shaft accident.
Not a good place rotor, or unbalanced loading the sample over too big, centrifuges running. Although modern centrifuges are unbalanced import protection, that is, when the imbalance exceeds a certain limit, should be off automatically, so that the centrifuge to stop. However, in these circumstances, it was too late, there will be fatalities. One fatal accidents off-axis, due to sudden off-axis high-speed rotation, the centrifugal rotor is no support, in cavity milling rattling centrifuge, centrifuge machine can turn 270 ° angle. At this point, if there's personnel or equipment will result in casualties and destruction of equipment accidents.