Case analysis and treatment of common faults in desktop centrifuges Example 1. Slow motor speed, large spark analysis and overhaul of the brush: This fault is caused by dirt or carbon spring between the motor carbon brush and the commutator Small, resulting in poor contact between the carbon brush and the commutator. Disassemble the machine, unscrew the brush cover, and remove the carbon brush with the spring. First clean the spring, carbon brush and the dirt on the commutator with anhydrous alcohol. If the front end of the carbon brush is broken, use the sandpaper to mix the carbon brush into a smooth curved contact surface to make it and the circle. The commutator piece is in good agreement. Then adjust the spring force of the spring appropriately. After the above processing, the fault can generally be eliminated.
Example 2. When the benchtop centrifuge is working, it emits a very loud vibration and noise analysis and overhaul: the causes and solutions for causing vibration and noise when the centrifuge is working are:
(1) The upper part of the rotating shaft is fixed to the turntable screw or the vibration-retaining spring fixing screw on the machine base, and the fasteners are loose. Just re-tighten it once.
(2) The motor shaft is bent or the bearing is worn. If the motor shaft is bent, it can be solved by repairing the correction. If it is serious, it should be replaced. If the gap is increased after the bearing wears, it can be solved by a gasket on the bearing. In case of seriousness, it should be replaced.
(3) The three spring-loaded springs on the machine base become smaller or broken, which makes the turntable shake more when it rotates. Just replace the shock absorbing spring.
(4) The cover is deformed or incorrectly positioned. As long as the cover is repaired, adjusted and calibrated, and the cover is fixed and fixed.
(5) There is a foreign matter such as broken glass in the test tube sleeve, which makes the load unbalanced. Before each use, check for any foreign matter in each casing. If it is, it must be removed before use.
(6) The test tube sleeve does not match the machine. The test tube sleeve is precisely matched to the machine for the manufacturer. Different types of centrifuge tube sleeves cannot be exchanged at will. Otherwise, vibration and noise will be generated when the centrifuge is working.
Example 3. Turn on the power, the motor does not turn analysis and maintenance: When repairing, first observe whether the work indicator is on. If it is not lit, the cause of the fault is abnormal except for the input circuit of the power line and the power switch K1. Generally, the primary coil of the power transformer BI has an open circuit. If the BI is a non-burning open circuit, the multimeter can be used to measure the on/off of each tap in turn to find the breaking part (breaking point), as long as the breaking point is reconnected to the welding fast. If the BI is a burn-in circuit, rewind or replace it. If the indicator light is on, check whether the speed switch K2, timer and motor are damaged. First measure whether there is 220V voltage across the motor; if not, the timer and K2 have an open circuit. For the inspection of K2, the oxide on the surface of the contact can be scraped off with a knife. Then adjust the initial position of the correction contact spring to make it contact well. For the timer check, the timer can be removed, disassembled, and its contacts cleaned, adjusted and corrected. If the spring or cam is damaged, the timer should be replaced; if the motor has 220V voltage at both ends, The motor is faulty. Listen to the motor for "click" sound, if any, the motor stator and rotor are stuck by foreign objects, as long as the motor is disassembled, the foreign matter between the rotor and the stator can be removed; if there is no "click" sound, then The winding has an open circuit that can be re-wound or replaced with a new one.
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Example 2. When the benchtop centrifuge is working, it emits a very loud vibration and noise analysis and overhaul: the causes and solutions for causing vibration and noise when the centrifuge is working are:
(1) The upper part of the rotating shaft is fixed to the turntable screw or the vibration-retaining spring fixing screw on the machine base, and the fasteners are loose. Just re-tighten it once.
(2) The motor shaft is bent or the bearing is worn. If the motor shaft is bent, it can be solved by repairing the correction. If it is serious, it should be replaced. If the gap is increased after the bearing wears, it can be solved by a gasket on the bearing. In case of seriousness, it should be replaced.
(3) The three spring-loaded springs on the machine base become smaller or broken, which makes the turntable shake more when it rotates. Just replace the shock absorbing spring.
(4) The cover is deformed or incorrectly positioned. As long as the cover is repaired, adjusted and calibrated, and the cover is fixed and fixed.
(5) There is a foreign matter such as broken glass in the test tube sleeve, which makes the load unbalanced. Before each use, check for any foreign matter in each casing. If it is, it must be removed before use.
(6) The test tube sleeve does not match the machine. The test tube sleeve is precisely matched to the machine for the manufacturer. Different types of centrifuge tube sleeves cannot be exchanged at will. Otherwise, vibration and noise will be generated when the centrifuge is working.
Example 3. Turn on the power, the motor does not turn analysis and maintenance: When repairing, first observe whether the work indicator is on. If it is not lit, the cause of the fault is abnormal except for the input circuit of the power line and the power switch K1. Generally, the primary coil of the power transformer BI has an open circuit. If the BI is a non-burning open circuit, the multimeter can be used to measure the on/off of each tap in turn to find the breaking part (breaking point), as long as the breaking point is reconnected to the welding fast. If the BI is a burn-in circuit, rewind or replace it. If the indicator light is on, check whether the speed switch K2, timer and motor are damaged. First measure whether there is 220V voltage across the motor; if not, the timer and K2 have an open circuit. For the inspection of K2, the oxide on the surface of the contact can be scraped off with a knife. Then adjust the initial position of the correction contact spring to make it contact well. For the timer check, the timer can be removed, disassembled, and its contacts cleaned, adjusted and corrected. If the spring or cam is damaged, the timer should be replaced; if the motor has 220V voltage at both ends, The motor is faulty. Listen to the motor for "click" sound, if any, the motor stator and rotor are stuck by foreign objects, as long as the motor is disassembled, the foreign matter between the rotor and the stator can be removed; if there is no "click" sound, then The winding has an open circuit that can be re-wound or replaced with a new one.
The company's main: tube separator series, GQ series high-speed tube centrifuge , Chinese medicine clarification tube centrifuge, GF series tube centrifuge , blood separator, oil-water separator, three-legged upper discharge centrifuge, Three-legged centrifuge, cell separator
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