Installation and maintenance
Pay attention to the point
From the perspective of use, the following points should be paid attention to to ensure that the bearing can work reliably:
1, improve the quality of lubrication, control the oil pressure, temperature and flow, strengthen the oil filtration.
2. Fuel oil and lubricating oil in accordance with regulations shall be used.
3. It is unfavorable to control the temperature state of the diesel generator set and work under the condition of too cold and too hot.In cold weather, the diesel engine should be preheated before starting, and the crankshaft is rotated by hand to make the oil enter the friction surface.
4. The surface quality and geometry of the bearing and journal shall be strictly guaranteed.
5, bearing clearance should be appropriate, the generator set too large impact, too small, poor lubrication, may burn tiles.
How to ensure that the bearing works reliably
Generally speaking, the following points should be paid attention to from the perspective of use:
1.Bearing clearance to appropriate, too big impact, too small is poor lubrication, may burn tile;
2.Bearing and journal surface quality and geometry should be strictly guaranteed;
3.Improve lubrication quality, control oil pressure, temperature and flow, enhance oil filtration;
4.Adopt fuel oil and lubricating oil in accordance with regulations.
In order to give full play to the bearing and maintain its due performance for a long time, regular maintenance (regular inspection) must be done effectively.It is very important to improve productivity and economy to detect faults early and prevent accidents in the future through proper regular inspection.
Bearing installation is correct, affect the accuracy, life, performance.Therefore, the design and assembly department for the bearing installation to fully study.You want to install according to operating standards.Items of operating standards are usually as follows:
(1) clean the bearing and bearing related parts
(2) check the dimensions and finishing of related parts
(4) check after installing the bearing
(5) provide lubricant
It is hoped that the bearing packing will not be opened before installation.General grease lubrication, do not clean, directly fill the grease.Lubricating oil lubrication, ordinary do not have to clean, but, with instruments or high-speed bearings, such as, to clean with clean oil, remove the rust agent coated on the bearings.The bearing that removed antirust agent, easy rust, so cannot place ignore.Furthermore, bearings sealed with grease are not cleaned for direct use.
Bearing mounting method, bearing structure, fit, conditions and different, generally, because the shaft rotation, so the inner ring need interference fit.Cylindrical bore bearing, multi - purpose press press, or multi - purpose hot mounting method.For taper holes, install directly on the taper shaft, or install with a sleeve.
When mounting to the shell, there is usually more clearance fit and interference in the outer ring, which is usually pressed in with a press machine, or there is also a cold shrink fit method for installation after cooling.With dry ice as coolant, cold shrinkage with the installation of the occasion, the moisture in the air will condense on the surface of the bearing.So, need proper antirust measure.
Bearing disassembly is scheduled maintenance, bearing replacement.After disassembly, if the bearing is still in use, or if it is necessary to check the condition of the bearing, the disassembly shall be carried out with the same care as during installation.Pay attention not to damage the parts of the bearing, especially interference with the disassembly of the bearing, the operation is difficult.
It is also important to design and manufacture disassembly tools as needed.In the process of disassembly, according to the drawings to study the disassembly method, order, investigation of the bearing conditions, in order to obtain the disassembly operation is foolproof.
The outer ring of the outer ring shall be equipped with screws for extruding screw in several places on the circumference of the shell in advance. Screw the screw equally on one side and remove at the same time.These screw holes are usually covered with the blind plug, tapered roller bearings, and other detachable bearings. Several incisions are made in the housing block shoulder.
The removal of the inner ring can be done with a press machine.At this point, pay attention to let the inner ring bear its pulling force.In addition, the pull-out fixture shown is also mostly used, no matter which fixture, it must be firmly stuck in the inner ring side.To this end, need to consider the size of the shaft block shoulder, or research in the block shoulder processing groove, in order to use pull clamp.
The inner ring of large bearing is disassembled by oil pressure method.Oil pressure is applied to the oil hole of the bearing for easy drawing.Large width of the bearing oil pressure method and drawing fixture, for disassembly.
The inner ring of cylindrical roller bearings can be removed by induction heating.The method of heating the part in a short time and drawing the inner ring after expansion.Induction heating is also used where large Numbers of these bearing inner rings are required.
When the bearing is removed for inspection, use photography and other methods to make the appearance record first.In addition, confirm the amount of remaining lubricant and sample the lubricant before cleaning the bearing.
A. The cleaning of bearings can be divided into rough and fine cleaning, and a metal mesh frame can be placed at the bottom of the container.
B. During rough washing, use a brush to remove grease or adhesive in oil.At this point, if the bearing is rotated in oil, the rolling surface will be damaged due to foreign bodies.
C. during the fine washing, slowly turn the bearing in the oil, which must be done carefully.
Generally used cleaning agent for neutral water - free diesel or kerosene, according to the need sometimes also use warm lye, etc.No matter what kind of cleaning agent, always filter to keep clean.
Immediately after cleaning, apply anti-rust oil or anti-rust grease to the bearing.
Examination and judgment
In order to judge whether the removed bearing can be reused, it is important to check its dimensional accuracy, rotary accuracy, internal clearance, mating surface, raceway surface, cage and seal ring, etc.Because large bearings cannot be rotated by hand, pay attention to check the appearance of rolling body, raceway surface, cage, shield surface, etc.
Cause of heating of rolling bearing and its elimination method
Low bearing accuracy: the bearing with specified accuracy level is selected.
Spindle bending or box hole different center: repair spindle or box.
Poor lubrication: select the specified grade of lubrication materials and properly clean.
Low assembly quality: improve assembly quality.