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Significant progress in the production technology of pharmaceutical centrifuge

2019/5/13 13:31:10      click :
In recent years, pharmaceutical centrifuges have greatly improved in terms of performance and reliability, with the rapid development of microelectronics technology and machinery industry.
1. The first transmission technology reduces noise and vibration
Pharmaceutical centrifuges used to be driven by electric motors, and some were powered by high-pressure airflow. Since the carbon brush and commutator of the motor are important factors for generating spark interference, noise and affecting the life of the motor, more and more centrifuges have adopted variable frequency motors or brushless DC motors in recent years. The variable frequency motor drive mode not only saves the work of replacing the carbon brush, but also avoids the pollution of carbon dust. Moreover, the frequency conversion turbulence system is easier to control the speed under the control of the microcomputer, so that the braking and acceleration time are idealized even when the speed is When it reaches a high level, pharmaceutical centrifuges also minimize noise and vibration. In addition, the variable frequency drive method also saves energy. The position sensor or single-chip microprocessor of the DC motor realizes the starting and regulating of the motor, and the wear resistance of the motor brush is also greatly improved. Some brushes can reach 4000 hours.
Some pharmaceutical centrifuges are designed with anti-friction parts and stabilizer sleeves in the transmission system, and electric quick brakes, so that the centrifuge can increase the acceleration too much during the lifting speed, and smoothly pass the critical speed of the rotor to the critical speed of the rotor. The system resonance caused by the time is reduced to the minimum. The motor buffer base or suspension frame, the elastic coupling, and the sound suppression system reduce the noise, making the working environment more quiet and comfortable.
2, microcomputer control and calculation system, operation is very convenient
Control and calculation are generally carried out using a microcomputer. The user can conveniently select operating parameters as needed. Generally, there are more than nine kinds of acceleration curves to choose from. Multiple or more application centrifugation programs can be stored. CTR liquid crystal or LED digital display shows the pre-selected value and actual condition of data such as speed, acceleration, centrifugal force value, rotor parameter and centrifuge chamber temperature at a glance. All operating parameters of the pharmaceutical centrifuge are reproducible. Some centrifuges have an RS232 standard interface for an external computer to record, set or modify operating parameters from an external computer. Some centrifuges perform related calculations and conversions during rotor operation, such as automatically calculating the relevant centrifugal force field (RCF) and preventing the reduction of cesium chloride (CsCI) precipitation, automatically optimizing and simulating ideal operating conditions. The US BECKMAN oPtima series of ultracentrifuges are equipped with an optical detection system to scan the optical density of the sample during sample separation. It is especially suitable for: receptor/self-receptor research, determination of molecular weight, calculation of precipitation coefficient, quality control of biological products.
3, a variety of rotor series of pharmaceutical centrifuges, to meet different centrifugal operations
With the continuous expansion of the application field of centrifuges, there are currently more than one hundred varieties of rotor types. Angle rotors, vertical rotors, flattened rotors and drum rotors, as well as a wide range of test tubes and brackets for almost all centrifugation operations. In order to facilitate the user and increase the interchangeability, the centrifuge rotor of the Lu Xiangyi centrifuge manufacturer can be used for a variety of rotors. The pharmaceutical centrifuge uses a flat rotor hood to greatly reduce the wind resistance during operation. Under the same motor power consumption, the rotor speed of a separate 14.4 liter capacity is increased from 3200 rpm to 4000 rpm.
In addition to the use of plastic rotors for desktop low-speed machines, the centrifuges use super-hard aluminum alloy or titanium alloy as the rotor material. The new molding process adopts die forging and over-speed forming to refine the grain of the material and increase the strength of the rotor. Surface machining center to improve machining accuracy and efficiency.
4, small and efficient refrigeration and vacuum system
Many samples are sensitive to temperature and require separation at room temperature or below. High-efficiency fluorine-free refrigeration system, small volume, low noise, does not damage the atmospheric ozone layer, can make the temperature range of the centrifuge chamber reach 20 °C ~ +40 °C, soil 1 °C to reduce wind resistance to speed up to reach the highest working speed and speed up the cold turn To extend the life of the motor and ensure temperature control, ultracentrifuges, some high speed centrifuges and low speed large capacity centrifuges are equipped with a vacuum system. The pharmaceutical centrifuge is equipped with an automatic vacuum system with a vacuum of 0.5 atmospheres. Centrifuges are also currently undergoing refrigeration using semiconductor devices.