Laboratory centrifuges are specialized equipment for rapid separation of mixed solutions by centrifugal force. They are widely used, such as biological cells, viruses, serum, proteins and other organic and inorganic solutions in biochemical research. Preparations such as separation, concentration and extraction of samples such as suspensions and colloids. Among them, the common laboratory centrifuge (revolution number is 4000 ~ 5000 r / min) is the most common. The following is a brief introduction to the maintenance and repair of the ordinary laboratory centrifuge.
Ordinary laboratory centrifuges consist of motors, turntables, and governors. Casing, base, etc., in which the motor rotates at a light load, but the speed decreases sharply as the load increases.
1 use and maintenance
(l) It must be placed on a stable, sturdy ground before using the laboratory centrifuge.
(2) The chassis should be grounded when in use.
(3) The load must be balanced when used, and it must be placed symmetrically when the installation meets.
(4) When turning on the switch, the speed control knob should be at 0 position.
(5) Turn on the switch speed control knob to open to the maximum, the correct way is to slowly increase the speed control knob.
(6) After use, the speed-regulating knob should be rotated back to 0, and then let it stop by itself. It is strictly forbidden to open the cover without being stopped and turned on.
(7) If it is found that the sound is not normal, it should be shut down immediately and checked and repaired.
(8) The wear of the commutator and the brush should be checked regularly (about one year). If there is excessive wear, it should be changed immediately.
(9) The bearings of the motor should be filled with grease regularly.
2 elimination of common faults
(l) After power-on, the motor does not turn: first check the power cord, plug, and socket. If it is damaged, it should be replaced. If there is no problem, check whether the band switch or varistor is damaged or the cable is disconnected. If damaged or opened, replace the damaged component and re-weld the wire. If there is no problem, check whether the motor field coil is broken or open (internal). If the coil is broken, it can be re-welded. If the coil is internally broken, it can only rewind the coil.
(2) The motor speed does not reach the rated speed: first check the bearing, if the bearing is damaged, replace the bearing. If the bearing is short of oil or too much dirt, the bearing should be cleaned and greased. Check whether the surface of the commutator is abnormal or whether the matching of the brush and the surface of the commutator is consistent. For example, if there is an abnormality on the surface of the commutator, if there is a layer of oxide, it should be sanded with fine sandpaper. If the matching between the commutator and the brush does not match, the contact should be adjusted to a good condition. If there is no such problem, check whether there is a short circuit in the rotor coil. If there is any, rewind the coil.
(3) Vibrate and noisy: check if there is an imbalance. The screw of the fixed machine is loose. If it is, tighten it. Check the bearing for damage or bending. Replace the bearing if any. The machine cover is deformed or the position is incorrect. If there is, adjust it.
(4) The low speed gear cannot be started when it is cold: the lubricating oil solidifies or the lubricating oil deteriorates and sticks. At the beginning, you can use your hand to help re-rotate after re-rotating or cleaning.
(5) The gap between the commutator and the brush is too large: check whether the surface of the commutator is flat. If the surface is not flat, it can be sanded. If the problem is that the brush and the commutator are in poor contact. If the contact is poor, sand the surface with fine sandpaper and re-adjust the fit between the brush and the commutator. The quality of the brush is unqualified. If it is faulty, only the brush can be replaced. If there is no problem above, check whether the field coil has a partial short circuit or ground or the rotor coil has a partial short circuit or open circuit. If any of the above occurs, the magnetic field coil or the rewind rotor coil must be re-wound. For more information
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