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How to ensure the reliable operation of bearings

How to ensure the reliable operation of bearings

2020-04-21

Generally speaking, the following points should be noted from the perspective of usage:

1. When the bearing clearance is appropriate, if the bearing clearance is too small, it will cause too big impact, resulting in poor lubrication and possible burning of shoes;

Ensure the surface quality and geometry of bearing and journal;

3. Improve the lubrication quality, control the pressure, temperature and flow of oil, and strengthen the filtration of oil;

4. Use of specified fuels and lubricants.

In order to make the bearing fully play its role and maintain its due performance for a long time, it must be maintained on a regular basis (regular inspection).It is important to improve productivity and economy through proper periodic inspections, early detection of faults and prevention of accidents.

Matters needing attention when using bearings

Bearing is an important part of modern mechanical equipment.Its main function is to support the mechanical rotating body, reduce friction coefficient and ensure the accuracy of its rotation.Which part of the Bearing should we look at?Today, the steel structure Bearing asks you to understand what we should pay attention to when we use it.

Installation and maintenance of bearings

Pay attention to the key

From the perspective of use, to ensure the reliable work of bearings, pay attention to the following points:

Improve lubrication quality, control oil pressure, temperature and flow, strengthen oil filtration.

2. Use proper fuels and lubricants.

To control the temperature state of diesel generator set, it is disadvantageous to work under the condition of too cold and too hot.In cold weather, warm up the diesel engine before starting, then turn the crankshaft by hand to bring oil into the friction surface.

4. The surface quality and geometry of bearing and journal are strictly guaranteed.

5, the bearing clearance should be appropriate, the generator set impact is too large, if the lubrication is too small, can burn tile.

Bearing maintenance

Bearing apart

Bearing disassembly is scheduled maintenance, bearing replacement.After disassembling, if continuous operation is required, or if the bearing needs to be inspected, the disassembling shall be carried out with the same care as the equipment.Take care not to damage the bearing parts, especially the interference cooperation bearing disassembly, the operation is difficult.

It is also important to plan and break things down according to requirements.When disassembling, according to the drawing discussion disassembling method, second, inquiry bearing cooperation conditions, in order to obtain the full grasp of disassembling operation.

Take apart the outer ring of interference cooperation. In advance, set several outer rings on the circumference of the shell and kneading the screw with screws. Tighten the screw evenly on one side and take apart the screw on the other side.These screw holes usually cover blind plug, tapered roller bearings, such as the separation of bearings, in the shell of the shoulder set out several blocks, the use of cushion, with a press to open, or quietly knock open.

The inner ring of the open, you can use the press out the most brief.At this point, pay attention to let the inner ring bear its pulling force.Furthermore, the pull-out fixture shown is often used, regardless of the fixture, it must be firmly stuck around the inner ring surface.For this, the demand to consider the standard of the shaft block shoulder, or research in the block shoulder processing groove, in order to use drawing fixture.

The inner ring of large bearing is disassembled by oil pressure method.Oil pressure is applied through the oil hole arranged in the bearing to facilitate drawing.The large width of the bearing oil pressure method and drawing fixture with the operation of disassembling.

The inner ring of cylindrical roller bearing can be disassembled by induction heating method.A method of drawing the inner ring by heating it locally in a short time.Demand equipment for a large number of such bearing inner ring occasions, also use induction heating method.

How to clean the bearing

When the bearing is removed for inspection, the appearance record shall be made by shooting first.In addition, the amount of the remaining smoothing agent should be acknowledged and the smoothing agent should be sampled before the bearing is cleaned.

A. bearing cleaning is divided into rough washing and fine washing, and a metal grid can be placed on the bottom of the container used.

B. When rough washing, use the brush in the oil to remove smooth grease or adhesion.If at this time in the oil rolling bearing, attention will be damaged by foreign matters such as rolling surface.

C. During fine cleaning, the bearing shall be rolled in oil gradually and carefully.

General use of the cleaning agent is neutral without water diesel or hot oil, according to the demand sometimes also use warm lye.No matter what kind of detergent you use, always filter to keep it clean.

Apply antirust oil or antirust grease to the bearing immediately after cleaning.

Inspection and discrimination

In order to distinguish whether the disassembled bearing can be used from scratch, emphasis should be placed on the inspection of its standard accuracy, rotation accuracy, internal clearance, as well as the cooperation surface, raceway surface, cage and seal ring.Since large bearings cannot be rotated by hand, pay attention to check the appearance of roll body, raceway surface, cage, retaining surface and so on. The higher the importance of bearings, the more careful inspection is required.3919 bearing bearing model, 3919-2rs bearing bearing model, 3919-2z bearing bearing model,3019 bearing bearing model, 3019-2rs bearing bearing model, 3019-2rs bearing bearing model, 3019-2rs bearing bearing model, 3019-2z bearing bearing model,3219 bearing bearing model, 3219-2rs bearing bearing model

Causes of heating of roll bearing and its cleaning method

Low bearing precision: choose bearing with normal precision grade.

Spindle zigzag or different orifices: correct spindle or box.

Poor smoothness: the smooth materials of the standard trademarks should be selected and cleaned properly.

Low installation quality: traveling installation quality.

Running circle of bearing inner shell: replace bearing and related wear parts.

Too much axial force: cleaning and adjusting the seal ring gap between 0.2 and 0.3mm, correct impeller balance hole diameter and check the static balance value.

Bearing damage: replace bearing.

How to keep the bearings?

Bearings are coated with appropriate amount of anti-rust oil and anti-rust paper packaging, as long as the packaging is not damaged, the quality of the bearings will be ensured.But for long-term storage, under the condition of humidity below 65% and temperature around 20℃, it is advisable to store it on a shelf 30cm above the ground.In addition, the storage place should avoid direct sunlight or contact with the cold wall.

Quality inspection

National standard of bearing

1.National standard of vibration acceleration (commonly known as z-standard)

This standard is formulated earlier, in order to measure the vibration acceleration value of the bearing when rotating, to determine the bearing quality grade, divided into Z1, Z2, Z3 from low to high three quality grades.At present domestic bearing manufacturers are still in use, the value of vibration acceleration to measure the quality of the bearing, just a brief reflection of the fatigue life of the bearing.

2.Vibration velocity standard (commonly known as V standard)

Because the original vibration acceleration standard has not been abandoned, so the standard is issued by the ministry of machinery industry standards, is a reference to the European standards combined with the actual situation and needs of our country to determine the bearing vibration speed to distinguish the quality of the bearing grade (equivalent to the national standard).Divided into V, V1, V2, V3, V4 five quality levels.Various ball bearing quality classes from low to high V, V1, V2, V3, V4;Roll bearings (cylinder, cone) quality grade from low to high for V, V1, V2, V3 four quality grade.

It is used to detect the vibration b velocity of bearing at different frequency segments (low frequency, medium frequency and high frequency) to reflect the bearing quality.It can be roughly divided into the bearing whether there is a geometric standard problem (such as the steel ring ellipse), the raceway/roll mass problem, the quality problem of the cage, than the vibration acceleration to query the bearing mass has a significant progress.At present, the domestic export to Europe bearings, our military and aerospace industry are in accordance with the standard for bearing quality testing, together with the detection of European imported bearing quality and identify the supply of fake imported bearing a feasible method.3020-2z bearing bearing model,3220 bearing bearing model, 3220-2rs bearing bearing model, 3220-2z bearing bearing model

There are two parallel standards in the bearing quality detection, and the bearings with high quality grade of "z-standard" may not have good quality performance when tested with "v-standard", and there is no correspondence between the two.This in the bearing quality inspection is to pay special attention to.

How to distinguish the quality of bearings

Distinguish the quality of equipment bearings, we generally from the following aspects:

1. Is the outer packing clear

Under general circumstances, the brand that formal manufacturer produces has oneself special plan personnel to undertake outside packing plan, and the factory that organizes production condition passes undertakes manufacturing to produce, consequently, the package of product no matter from line to color piece should be very clear, without ambiguity.

2, the steel print is clear

Each bearing product will be printed on the bearing product body its brand name, label, etc.Although the font is very small, but the formal manufacturers of the products are used steel printing technology to print, and in the process of pressing before without overheating, so that the font is small, but concave deep, very clear.And generally, the font of the counterfeit product is not only vague, as a result of the printing technology is rough, the font floats in the appearance, some and even easily with the hand to erase the traces of the craft may be severe.


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