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Medical centrifuges and the safe use of new technology |
| Author： Date：2008-08-30 |
1 centrifuge technology
1.1 temperature refrigeration When the rotor high-speed rotation, the air friction heat, the rotor temperature will rise in test-tube sample temperature will rise. As a result of temperature-sensitive biological samples. General requirements for centrifuge experiments to maintain the temperature 4 ?. No computer-controlled intelligent technology, it is impossible to achieve the accuracy of. As a result, use of the centrifugal chiller cooling chamber, to achieve the rotor cooling, cooling the temperature of samples. But the measurement of rotor rotation of the actual temperature is extremely difficult to use at home and abroad in the cavity at the bottom of the centrifuge rotor from temperature sensors set up to deal with more recent indirect measurement of rotor temperature. T here sample = T cavity + T compensation. T compensation with the type of rotor, running speed and time.
1.2 brushless direct-drive motor By centrifuge rotor motor with high-speed rotation. The motor is in the past with the carbon brush DC motor, the operation of centrifuges when the carbon brush wear, brought about by noise or vibration and sparks, and there is life, then to replace the carbon brush re-operation of the Almighty. Worst of all carbon brush wear and tear brought about by the carbon dust pollution, pollution is not only centrifuges, but also the surrounding environment pollution, pollution on the health of this industry is not appropriate.
1.3 show that digital technology Simulation of a typical performance of the twist knob to choose the form of operating parameters (such as speed, temperature and time, etc.) to the dial indicator to show the data. Its drawback: the choice of parameters and data readings by the value of the operator's reading and human disturbance, poor control accuracy. And each operation must be the case, poor reproducibility. Although the figures show that some centrifuges (for example, while the value of the knob election figures), although there is improvement in reading, but the value remains the same principles of simulation technologies; figures show that the typical form of user-friendly, keyboard, digital display , A wholly-programmable computer-controlled operation, as the core of intelligent control is achieved by the computer. Operating centrifuges needed for all parameters (such as speed, temperature, time, addition and subtraction rate files, etc.), keyboard input, and the figures come out, the choice of operating parameters and to read a very small number of errors. Also, because the operation is programmable, it can draw a set of operating parameters into numbers, can be used to access.
2 On the safe use of centrifuge The right to install
2.1
(1) power supply voltage: voltage fluctuations to +10% in line with national standards, or some of the manufacturers of centrifuges can not operate normally. If the voltage fluctuations in the above proposal by regulators for the power grid in line.
(2) ground to prison: a room of the power supply to meet the requirements of the wiring. China is a three-phase four-wire system. Three-phase industrial power in the three-phase, three-phase power use when the zero line with the separation of earth and, more importantly, whether or three-phase power industry, in general single-phase power or ground should be reliable, so as to avoid leakage , The ground can not take in the heating pipes, water pipe on.
(3) to the ground formation, the firm: large-scale centrifuge, in place of the installation of the floor to move firmly to ensure the normal work of centrifuge rotors, Xianao not get fixed Department should be smooth and solid ground.
(4) to find a good level: to find a more accurate level of small scale, open the lid of centrifuges, in the main shaft to find the level of castor 4 by adjusting the next adjustment of the screw bolt action came to a good level of attention to a foot of which can not come to nothing.
2.2 installed like to find a balance In the design and manufacture of centrifuge, the rotor of the imbalances brought about by the processing error has been made to remedy the balancing test, but any centrifuges, has its own equipment to allow the kind of unbalance. Centrifuges centrifuges in order to allow manufacturers of the largest imbalance on a limited indicator of the competition with other manufacturers, as far as possible given greater value. In this larger value, the centrifuges could be operating, but at this time have the power imbalance per minute n times the frequency of the impact of suddenly bearing and support, centrifuges by the injury. As a result, users of those expensive centrifuges, as far as possible to find a good balance after centrifugation, the centrifuge of the good life.
2.3 Endovascular centrifugal clean water Operation of centrifuges used refrigeration, air because of water in the cavity centrifugal frost, after the frost down into the water. Most of the foreign low-speed high-capacity centrifuge, there is no drainage hole, the centrifugal chamber in the water producing a bigger and bigger. At this point, the user should be removed to the rotor, clean water. In the re-install the rotor, must be installed to avoid an accident.
2.4 aluminum alloy can not be subject to corrosion Centrifuge rotor is generally used to create aluminum alloy, corrosion by the lower intensity after easily out of the accident. Susceptible to corrosion of aluminum alloy liquid, cleaning after the application of hair-drying machine, or inverted for a period of time, did confirm to use. Some imported blood centrifuge, 6 aluminum cup due 6 plastic does not care. Care should be put in plastic blood bags, to avoid directly on the aluminum cup. Pay attention to whether the test-tube cracks. If the test-tube (in particular the repeated use of the test-tube) there are cracks, we should never use, or test-tube rupture in use will cause loss of balance in the rotor rotation can lead to fatal accidents, such as off-axis.
2.5 off-axis accident Rotor not a good place, or imbalance in the sample loading capacity of over too much, running centrifuges. Although the import of modern centrifuges have the protection of the imbalance, that is, when the imbalance is more than a limit should be automatic power to make centrifuges to stop. However, in such circumstances, is late, there will be a vicious accident. One of the accidents is off-axis, as in all of a sudden high-speed spin off-axis, a centrifuge rotor does not support the centrifugal chamber in Luanzhuanluanzhuang make centrifuge machines to 270° angle. At this point, if there is next to the staff or equipment, cause casualties and damage to equipment accident. |