How to use the operation and maintenance of centrifuges correctly

How to use the operation and maintenance of centrifuges correctly

When the rotor is rotated at a high speed, the air is rubbed, the rotor temperature will rise, and the sample temperature in the test tube will rise. Due to the sensitivity of biological samples. The temperature in the centrifugal experiment is generally required to maintain 4 ° C. It is impossible to do ± 1 ° C accuracy without computer control. Therefore, the centrifugal cavity is cooled with a refrigerator, and the purpose of cooling the rotor and the temperature of the sample is achieved. However, the actual temperature of the rotor (shown 13) in the rotation is extremely difficult, and the temperature of the rotor temperature is measured between the centrifugal cavity under the bottom of the centrifugal chamber. Here T sample = T cavity + T compensation. T compensation is related to the category, speed and run time of the rotor.

1.2 Brushless motor direct drive

The centrifuge is rotated from the motor with a rotor. The past motor is a carbon-brush DC motor, the desktop high-speed large capacity freezing centrifuge is operated during operation, bringing sparks and noise or even vibration, and life, while replacing the carbon brush can run again. More serious is the wear of carbon brushes to bring carbon dust pollution, not only polluting the centrifuge, but also pollutes the surrounding environment, which is not suitable for the health industry.

1.3 Display Digital Technology

The simulation technology typically shows the tie knob to select the operational parameters (such as speed, temperature and time, etc.) to display data in a pointer of the dial. The disadvantage is that the selection parameter and the data read value are more disturbed by the man who operator and the reader, and the control accuracy is poor. And each operation is like this, the repetitiveness is poor. Some centrifuges are digital display (such as knob selection), although there is improved on the reading, but the principle of value is not turned into analog technology; digital display is typical expression is interface-friendly, keyboard operation, digital display , The programmable operation of the full computer control, its core is intelligent, and is implemented by a computer. All parameters (such as speed, temperature, time, plus decrease), keyboard operation input are required, and the number of operation parameters is extremely small in digital display. Also because it is a programmable operation, a set of operational parameters can be encapsulated numbers and can be used.

2. How to use the centrifuge safely

2.1 Correct installation

(1) Power supply voltage: Voltage fluctuations should comply with national standards within + 10%, and the classification of Xiangli analyzes centrifuges may not work properly. If the voltage fluctuates more, it is recommended to use a regulator for compliance with this grid.

(2) The ground line is priority: the wiring of the power supply of the room should meet the requirements. China is three-phase four-wire system. The three-phase is three phases in industrial electricity. When using three-phase electricity, the neutral line is separated from the ground, and more importantly, whether it is three-phase industrial electricity, the general single-phase electricity, the ground should be reliable, so as not to leak electric The ground wire cannot be connected to the heating tube, tap water pipe.

(3) The ground is flat, firm: for large centrifuges, to move the floor in the installation site, to ensure that the rotor of the centrifuge is working properly, not trapped, the floor should be flat and firm.

(4) Look at the level: find a more accurate small horizontal feet, the centrifuge cover is opened, and the level is found on the spindle (graph 14), and the slot of the adjustment bolts next to the four casters will be found. 1 pin can't fall.

2.2 Drawing to find balance

When the centrifuge is designed and manufactured, the imbalance of the machining error of the rotor has been remedied by the balance test, but there is an unbalanced amount that is allowed by the desktop high-speed large capacity freezing. The centrifuge manufacturers compete with other manufacturers in order to compete with other manufacturers in order to make the maximum imbalance allowed by the centrifuge, try to give a large value. On this larger value, the centrifuge can operate, but the unbalanced force generated at this time suddenly impacts the bearing and the bracket at the N times per minute, and the centrifuge is damaged. Therefore, the user has the advantageous centrifuge, try to find a well-balance, and it is good for the life of the centrifuge.

2.3 Clean up the water in the centrifuge cavity

When the centrifuge is running, the cooling is used, due to the moisture of the air, frosting in the centrifugal cavity, and the cream is water. Most foreign low-speed large-capacity centrifuges, no drainage holes, and more water in the centrifugal cavity. At this point, the user should remove the rotor itself and clean the water. When reinstalling the rotor, it must be installed to avoid accidents.

2.4 can't be corroded

The centrifuge rotor is generally manufactured with aluminum alloy, and the intensity is reduced after corrosion, it is easy to accident. Aluminum alloy is susceptible to liquid corrosion, after cleaning, drying drying, or inverting for a while, confirming dry can be used. Some blood stations are imported from centrifuges, and there are 6 plastic support in 6 aluminum cups. Blood bags should be placed in the plastic Toro to avoid being placed directly in the aluminum cup. Note that the test tube has cracks. If the test tube (especially the test tube that is repeatedly used) has cracks, it is not available, otherwise the rupture of the test tube in use can cause the rotor to lose balance in the rotation, which can cause a malignant accident such as a broken axis.

2.5-off axis accident

The rotor is not placed, or the sample is unbalanced and the amount is too large, and the desktop high-speed large-capacity refrigerator is started. Although modern imported centrifuges have unbalanced protection, that is, when the unbalanced amount exceeds a certain limit, it should be automatically powered off, and the centrifuge is stopped. But in the above case, it is late, there will be a malignant accident. One of the malignant accidents is a broken axis. Due to the sudden broken axis in the high speed rotation, the centrifugal rotor has no support, and the centrifuge machine can be turned to the center of 270 ° in the center of the heart. At this point, if there is a person or device next to it, it will cause accidents to damage the equipment.