Example 1. The motor rotates slowly and the brush emits a lot of sparks. Analysis and Maintenance: This fault is caused by dirt or brush spring spring force between the motor carbon brush and the commutator, and the carbon brush is in contact with the commutator. Bad result. Remove the machine, unscrew the brush box cover, and remove the carbon brush with the spring. Clean the dirt on the spring, carbon brush and commutator piece with absolute alcohol first. If the front end of the carbon brush has collapsed, use a combination of burrs and sandpaper to grind the carbon brush to make it smooth and arcuate. The commutator piece fits well. Then increase the elastic force of the spring. After the above process, the fault can generally be ruled out.
Example 2. When the desktop centrifuge works, it gives out very loud vibration and noise analysis and maintenance: the cause and solution to the vibration and noise caused by the operation of the centrifuge is:
(1) There are loose parts such as fixing the turntable screw at the upper end of the rotating shaft or the damping spring fixing screw on the base, etc., as long as they are fastened again.
(2) Motor shaft bending or bearing wear. If the shaft of the motor is bent, it can be solved by repair and correction. If it is serious, it should be replaced. If the clearance increases after the bearing wears, it can be solved on the bearing to a home gasket, and should be replaced when serious.
(3) The three shock-absorbing springs on the stand become less elastic or break, which makes the turntable shake more. Just replace the damping spring.
(4) The cover is deformed or incorrectly positioned. Just fix, adjust and correct the cover and fix the cover firmly.
(5) There are foreign objects such as broken glass in the test tube sleeve, which will unbalance the load. Each use should be checked before each use for the presence of other foreign objects in the cannula. If so, they must be removed before use.
(6) The sleeve does not match the unit. The test tube set is precisely matched to the machine by the manufacturer. Different types of centrifuge sleeves are not interchangeable. Otherwise, the centrifuge will produce vibration noise.
Example 3. Turn on the power, the motor does not turn Analysis and overhaul: When overhauling, first observe whether the work indicator light is on. If it is not on, the cause of the fault is not the input circuit of the power line and the power switch K1. In general, the primary winding of the power transformer BI is disconnected. If the BI is a non-burnout circuit, you can use a multimeter to measure the continuity of each tap to find the location of the disconnection (break point), as long as the disconnection point is reconnected well. If the BI is a burnout circuit, it must be rewound or replaced. If the indicator light is on, check whether the speed control switch K2, timer and motor are damaged. First, measure whether 220V voltage is present across the motor; if not, the timer and K2 are open circuited. For inspection of K2, a knife can be used to scrape off the oxide on the contact surface. Adjust the initial position of the correction contact spring so that the contact is good. The timer can be checked, the timer can be removed and disassembled, and the contacts can be cleaned, adjusted and corrected. If the spring or the cam is damaged, the timer should be replaced; if the voltage across the motor is 220V, The motor is faulty. If there is a motor, the stator and the rotor of the motor are blocked by the foreign matter. If the motor is disassembled, the foreign matter between the rotor and the stator can be removed; if there is no “click†sound, it is The winding is open circuited and can be re-wound or replaced with a new motor.
Example 2. When the desktop centrifuge works, it gives out very loud vibration and noise analysis and maintenance: the cause and solution to the vibration and noise caused by the operation of the centrifuge is:
(1) There are loose parts such as fixing the turntable screw at the upper end of the rotating shaft or the damping spring fixing screw on the base, etc., as long as they are fastened again.
(2) Motor shaft bending or bearing wear. If the shaft of the motor is bent, it can be solved by repair and correction. If it is serious, it should be replaced. If the clearance increases after the bearing wears, it can be solved on the bearing to a home gasket, and should be replaced when serious.
(3) The three shock-absorbing springs on the stand become less elastic or break, which makes the turntable shake more. Just replace the damping spring.
(4) The cover is deformed or incorrectly positioned. Just fix, adjust and correct the cover and fix the cover firmly.
(5) There are foreign objects such as broken glass in the test tube sleeve, which will unbalance the load. Each use should be checked before each use for the presence of other foreign objects in the cannula. If so, they must be removed before use.
(6) The sleeve does not match the unit. The test tube set is precisely matched to the machine by the manufacturer. Different types of centrifuge sleeves are not interchangeable. Otherwise, the centrifuge will produce vibration noise.
Example 3. Turn on the power, the motor does not turn Analysis and overhaul: When overhauling, first observe whether the work indicator light is on. If it is not on, the cause of the fault is not the input circuit of the power line and the power switch K1. In general, the primary winding of the power transformer BI is disconnected. If the BI is a non-burnout circuit, you can use a multimeter to measure the continuity of each tap to find the location of the disconnection (break point), as long as the disconnection point is reconnected well. If the BI is a burnout circuit, it must be rewound or replaced. If the indicator light is on, check whether the speed control switch K2, timer and motor are damaged. First, measure whether 220V voltage is present across the motor; if not, the timer and K2 are open circuited. For inspection of K2, a knife can be used to scrape off the oxide on the contact surface. Adjust the initial position of the correction contact spring so that the contact is good. The timer can be checked, the timer can be removed and disassembled, and the contacts can be cleaned, adjusted and corrected. If the spring or the cam is damaged, the timer should be replaced; if the voltage across the motor is 220V, The motor is faulty. If there is a motor, the stator and the rotor of the motor are blocked by the foreign matter. If the motor is disassembled, the foreign matter between the rotor and the stator can be removed; if there is no “click†sound, it is The winding is open circuited and can be re-wound or replaced with a new motor.
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