The problem often encountered with laboratory centrifuges is that the speed is slowed down, which can be fatal for some primary users, because in many cases, the customer does not know what time to deal with, so only, do it urgently, with The extent to which the product affects production or work, and a series of contradictions, this time has missed the best time to deal with the problem.
The particles are distributed to certain specific positions in the gradient liquid under a certain centrifugal force to form a separation method of different zones. A method of centrifugally centrifuging particles having different sedimentation rates using different centrifugal speeds and centrifugation times is called differential centrifugation. The suspension containing two different particles is centrifuged at a constant speed to sink the large particles, the supernatant is poured into another centrifuge tube, the centrifugal force is increased, and the small particles are separated by centrifugation for a certain period of time. Separate multiple times to achieve separation. Differential centrifugation is mainly used to separate particles with large differences in size and density.
During the laboratory centrifuge test, the motor speed may be too slow, and the brush emits a large spark. What should be done in this case.
Analysis and overhaul: This fault is caused by dirt or carbon spring between the motor carbon brush and the commutator, which reduces the elastic force of the carbon brush and the commutator.
Solution: Disassemble the machine, unscrew the brush cover, take out the carbon brush with spring, first clean the spring, carbon brush and dirt on the commutator with anhydrous alcohol. If the front end of the carbon brush is broken, it can be used. Assorted enamel and sandpaper are used to grind the carbon brush to the smooth curved contact surface, which makes it fit well with the circular commutator. Then adjust the spring force of the spring appropriately.
The laboratory centrifuge power indicator and the instrument are normal. Press the start button and the laboratory centrifuge does not run.
Repair and treatment: Check the control circuit for no faults, replace the carbon brush in the laboratory centrifuge, and the machine can resume normal operation. This phenomenon is often encountered because the carbon brush is exhausted.
