Modernization promotes the advantages of the rapid centrifuge industry

Modernization promotes the advantages of the rapid centrifuge industry

A fast centrifuge is a machine that uses centrifugal force to separate liquid and solid particles or components of a mixture of liquid and liquid. The rapid centrifuge is mainly used to separate the solid particles in the suspension from the liquid, or separate the two liquids of different density and incompatible liquid in the emulsion (for example, separating the cream from the milk); it can also be used for Exclude liquids in wet solids, such as washing clothes with a washing machine; special super-speed tubular separators can also separate gas mixtures of different densities; using different density or granularity of solid particles to set different speeds in liquids, and some The settling rapid centrifuge can also classify solid particles by density or particle size.

One of the most troublesome problems of the industrial use of the rapid centrifuge is that the rapid centrifuge is used in chemical raw materials for a long time, and the rapid centrifuge corrosion problem encountered. Now we recommend 4 to prevent or slow down the rapid centrifuge corrosion. Four measures.

First, the selection of the material of the fast centrifuge is very important because different materials and separation requirements, you need to choose a different model. After the model and main parameters are determined, according to the corrosion resistance of different materials in different environments, comprehensive physical and chemical factors, cost performance and other factors are combined to determine the strength component materials from the basic surface. From the material itself, the target material it targets is safe.

Second, the mechanism design of the rapid centrifuge, an excellent design can extend the service life of the equipment and ensure the safety of the equipment. For structural design, the design defects most likely to accelerate corrosion are stress concentration tendency and gap environment, sometimes despite the metal soaking solution. In the middle, the corrosion rate is small; but the formation of the gap, due to changes in the chemical and electrochemical state of the internal solution, will cause severe crevice corrosion.

Third, the surface protection measures of the fast centrifuge

One of the basic ideas for controlling corrosion is to isolate the corrosive environment. In the design of rapid centrifuges, surface treatment methods such as flange, galvanizing, chrome plating, and electroless plating are often used. These methods are effective in many environments, but for rotating parts, an important phenomenon must be noted: The base material and the plating layer are two materials, and the coefficient of linear expansion is different, which will produce different deformation amounts when the rotating member is elastically deformed, thereby causing a large number of microcracks; if the above phenomenon exists, the corrosion will be accelerated. . Therefore, the method of surface protection for rotating parts should be used with caution.

Fourth, the use of corrosion inhibitors rapid centrifuge itself involves multidisciplinary, the use of fast centrifuges, in addition to the above measures, should also pay attention to study its application environment. The application of corrosion inhibitors is also widely used in practical applications. For some harsh environments, the use of appropriate corrosion inhibitors can make the parts suitable. As long as the process permits, the use of corrosion inhibitors should be an effective way for rapid centrifuge applications.

Combining the above four points can give a fast centrifuge a good protection, more corrosion resistance, making the rapid centrifuge more durable and safer.

Rapid centrifuge installation

(1) Power supply voltage: The voltage fluctuation should meet the national standard within +10%. Otherwise, some manufacturers' fast centrifuges cannot operate normally. If the voltage fluctuates above this, it is recommended to use a voltage regulator to comply with this grid.

(2) The ground wire should be firmly: the wiring of the power supply of 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 not, the general single-phase power is good, and the ground line should be reliable to avoid leakage. The ground wire cannot be connected to the heating pipe or the water pipe.

(3) The ground should be flat and firm: for large-scale fast centrifuges , the floor should be firmly fixed at the installation site to ensure the normal operation of the rotor of the fast centrifuge, without recessing, and the ground at the installation and fixing should be flat and firm.

(4) Find a good level: find a more accurate small level, open the lid of the rapid centrifuge, find the level on the main shaft, 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. .

Loading balance

In the design and manufacture of the rapid centrifuge, the imbalance of the machining error of the rotor has been remedy for the dynamic balance test, but all the fast centrifuges have the allowable unloading amount. Fast centrifuge manufacturers strive to give larger values ​​in order to compete with other manufacturers for the maximum unbalance limit allowed by fast centrifuges. At this larger value, the fast centrifuge can be operated, but the imbalance force generated at this time suddenly hits the bearing and the bracket at n times per minute, and the rapid centrifuge is damaged. Therefore, users of those expensive fast centrifuges, try to find a good balance and then centrifuge, which is good for the life of the fast centrifuge.

Clearing up stagnant water

The rapid centrifuge is operated with refrigeration, which is frosted in the centrifugal chamber due to the moisture of the air, and is frosted into water after the shutdown. Most foreign low-speed and large-capacity fast centrifuges have no drainage holes, and the water in the centrifugal chamber is more and more accumulated. At this point, the user should remove the rotor and clean up the accumulated water. When reinstalling the rotor, be sure to install it to avoid accidents.

Free from corrosion

The rotor of the fast centrifuge is generally made of aluminum alloy, and when it is corroded, the strength is lowered, and it is easy to cause an accident. The aluminum alloy is susceptible to liquid corrosion. After cleaning, it is blown dry with a hair dryer, or inverted for a period of time to confirm that it can be used. Some blood stations import fast centrifuges, and there are 6 plastic trays that should be in 6 aluminum cups. The plastic tray should be placed in a blood bag to avoid direct placement in the aluminum cup. 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 test tube rupture will cause the rotor to lose its balance during rotation, which may cause a vicious accident such as broken shaft.

Broken shaft accident

The rotor is not placed well, or the sample imbalance is too large, and the rapid centrifuge starts. Modern imported fast centrifuges have unbalanced protection, that is, when the unbalance amount exceeds a certain limit, the power should be automatically cut off to stop the rapid centrifuge. However, under the above circumstances, it is already late, and a serious accident will occur. One serious accident is broken shaft, since the high-speed rotation shaft suddenly broken, not supporting the centrifuge rotor, milling fast rattling centrifuge chamber, the centrifuge can quickly turn the whole angle of 270 °. At this time, if there are people or equipment next to it, it will cause casualties and damage to the equipment.