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Among several more detailed techniques for screening vibration data frequency band alarms and enveloping are the most common There are also rules based intelligent algorithms that can screen for known fault patterns Maintenance professionals responsible for the success of vibration based condition monitoring programs should thoroughly
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CAUSES OF VIBRATION Typical 1 times rpm vibrations include imbalance a soft foot and a bent shaft Mechanical looseness misalignment and resonance can generate vibrations at frequencies of two three or more multiples of rpm Failing bearings typically produce non integer multiples of pump speed
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Vibrator fixed bolt looseness or without locking spring washer cause vibration source center the damaged bearing heating Solution first use vibrator run after 2 h and 50 h to re examine the bolt found loose fastening immediately 4 Improper lubrication filled with too much or too little can cause bearing heating
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Vibration problems in bearings can have different causes The eccentric movement in a road roller is one example another is the linear acceleration which occurs when a wheel of a railway train passes a rail joint
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One other part of the vibrating screen that can cause its defects and unfortunate breakdowns are the bearings Bearings are designed to work with a temperature between 35°C and 60°C Operating beyond these temperatures can easily affect the performance of the bearings Overheating of bearings can be caused by too small radial clearance
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Vibrating screen bearings need to have strong bearing capacity good impact resistance high reliability good lubrication performance in order to overcome the deflection of the shaft Disassembly Method Improper disassembly of the vibrating screen what is vibrating screen bearing may cause damage to the inside of the bearing
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Specifically the reasons for the blockage of the vibrating screen can be summarized as follows 1 The density of the material is high and the selection of the screen is inappropriate 2 The material to be screened is wet 3 The material to be screened has static electricity or is easy to stick 4 The screened materials are lighter 5
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At the same time the transmission fault of the vibration screen is more complex not easy to repair Causes and measures The common transmission faults of the circular vibrating
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Under the influence of loads in rolling contacts described by the Hertzian Theory structural changes will occur and micro cracks will be initiated at a certain depth under the surface subsurface There are another two major causes of bearing flaking 1 Fatigue Life and 2 Improper Handling 1 Fatigue Life This is discounted as the
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The side plate of the vibrating screen is cracked the beam is broken and the structural parts are damaged This situation does not occur suddenly The working time at the critical frequency is too long For example the high strength bolts of a large number of fastening side plates are loose and the spring is severely deformed
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The correct use and careful maintenance can prevent the bearing from heating and burning to improve the design and processing quality of the vibration exciter The vibration exciter is the power source of the vibrating screen and is subjected to strong vibration and shock Practical experience shows that the main bearing damages are as follows
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Excessive loads may cause bearing parts to break Improper grinding heat treatment and assembly can cause residual stress and excessive thermal stress during operation can also cause bearing parts to break In addition improper assembly method and assembly process may also cause the bearing ring rib and roller chamfer to drop blocks 6 Gluing
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Damage from vibration Motors that are transported without the rotor shaft held securely in place can be subjected to vibrations within the bearing clearance that could damage the bearings Similarly if a motor is at a standstill and subjected to external vibrations over a period of time the bearings can also become damaged
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What to look out for reasons for main bearing failures There are several reasons why bearings can be damaged or fail This includes lubrication conditions choice of bearing material operating conditions improper bearing selection for applications and assembly installation techniques External influences like the ones listed above will
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Pumps can at times seem as if they are misaligned have bad bearings or are overheating but the cause is often an imbalance in the pump assembly or another component Imbalance also causes vibration and heat buildup Impellers should be precision balanced which has a huge impact on the life of the pump bearings An imbalance may be caused by
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Failure and under performance of vibrating screens may also be caused by damaged components If the spring and bearings found inside the machine are damaged they will instantly produce some noise during operations that indicates their failing condition Sieve parts which include pipe beam cross beam and screen frame can also get damaged
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The main reason for uneven force on the four corners of the shock absorber spring is the incorrect installation position which also causes uneven vibration frequency of the four corners of the vibration screen spring Solution Uniform feeding to avoid long overload on one side of the vibration screen
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The electromagnetic tension caused by the motor causes the axial movement of the motor to cause the motor vibration to increase In severe cases the shaft is ground and the temperature of the bearing is increased Rapidly rises 3 The gears and couplings associated with the motor are faulty
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Vibrating screen rolling bearing in the process of work by the impact load is bigger the centrifugal force generated by the eccentric block high speed rotating and centrifugal acceleration is bigger also combined with the working environment of dust is more so the use of the bearing type speed limit installation dimension the demand is
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Crusher vibrating screen is made up of many parts different parts have different functions bearing is one of the key parts of crusher bearing failure will directly affect the use of the crusher bearing is primarily driven equipment operation effect if bearing problems then will cause the equipment to normal operation so be handled in a timely manner Below I will explain to you what are
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Causes vibration bearing 1 when the bearing vibration may occur when local damage due to operation or installation errors small part of the raceways and rolling elements may be damaged Running scroll past the damaged parts will have a specific vibration frequency of bearing Vibration frequency analysis to identify damaged bearing parts
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3 For some parts with low stiffness such as the generator mirror end cover where the pipe is not directly connected to the bearing seat when the vibration in one direction exceeds 250 um fatigue damage will occur to the connection between these parts and the parts with high stiffness after the long term operation such as the connection
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The reasons for the small amplitude of the vibrating screen are as follows Low power supply voltage Too few eccentric masses The included angle of the eccentric block is too small Excessive feed volume Vibrating screen troubleshooting Replace with a high power motor Increase the number of eccentric blocks Adjust the feeding amount
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The top bearing killers or causes of damage and premature end of bearing life are inadequate lubrication contamination overload and improper handling and installation They affect
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Without normal lubrication the bearing cannot work Analysis of the reasons for the damage of the vibrating screen bearing shows that about 40% of the damage of the vibrating screen bearing is related to poor lubrication The lubrication methods of vibrating screen bearings are mainly divided into grease lubrication and oil lubrication
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These contain fewer smaller solid particles which generate noise when they pass between the balls and raceway External factors such as surrounding vibration can affect bearing noise Another problem particularly with smaller and thin section bearings is ring distortion caused by poor shaft or housing roundness
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Over time this pitting creates a fluting on the face of the bearing races When the fluting becomes severe enough bearings can fail which causes increased motor vibration If left unresolved the motor will fail The vertical lines above are the key indicators of fluting on a bearing race
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A failed bearing will not be able to properly support the drive shaft and as a result the drive shaft will flex incorrectly which will cause vibration and shuddering A worn center support bearing will not be able to properly support the vehicle and will render it undrivable once it completely fails
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Here we will discuss the likely major causes of vibrations in a steam turbine of any thermal power plant 1 Unbalancing of Steam Turbine Rotor There are many possible reasons for the unbalancing of a turbine rotor One of them could be the uneven mounting misalignment or structural inaccuracy Another reason for an unbalanced rotor that can
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Furthermore once the roller bearing sustains damage the condition is usually irreversible and no amount of maintenance except replacement can restore the bearing to its original state Figure 2 Top reasons roller bearings fail For example roller bearings will cause vibration each time they pass over a damaged or pitted roller
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