Maintenance of the deck crane bearing

Remove deck crane bearing overhaul, the first records bearing appearance, confirm the remaining amount of lubricant, after sampling inspection by the lubricant, cleaning bearings. As a cleaning agent, general use gasoline, kerosene.
Removed bearing cleaning, cleaning rough and fine washing, respectively in the container, metal mesh on the bottom first, make the bearing does not directly contact the container dirt. Rough cleaning, if you rotate the bearings with dirt, can damage the bearing rolling surface, should pay attention to. In the crude oil washing, use the brush to remove grease, adhesive material, generally after a clean, to wash.
Sperm washing, cleaning of oil bearing is in while rotating, while carefully cleaned. In addition, cleaning oil should be kept clean.
Dismantled in order to determine the bearing can then use, should check the slewing ring bearings cleaned, carefully check the raceway surface, rolling surface, with the surface state, maintain and increase shelf wear, bearing clearance and non dimensional accuracy on the decline in injury, abnormal. Non separation of small ball bearings, inner ring with one hand supporting level, to confirm whether the smooth rotating ring.
Bearing separation type bearings, can check on the raceway surface rolling body, the outer ring, because large bearing cannot rotate with the hand, pay attention to check the rolling, raceway, cage, retaining boundary surface appearance, Crossed Roller Slewing Bearing shall carefully check the higher importance.
Large machinery can not be manually rotated, so the no-load starting immediately after power cut, mechanical idling, check whether the vibration, noise, rotating parts are in contact and so on, confirmed no abnormal, into the dynamic operation.
Power operation, from the no-load speed, slowly increased to the rated operating condition. Test run of issues, whether there is abnormal sound, bearing temperature, lubricant leakage or discoloration etc.. If abnormal, should immediately suspend the operation, inspection machine, necessary to remove the bearing inspection.

The effect of bearing

The effect that should be supported, namely literal interpretation to the bearing, but this is only a part of its roles, supporting its essence is to bear radial load. Can also be understood as it is for a fixed shaft. Is the only fixed axial bearing rotation, moving to control the axial and radial. Motor without bearing the consequences that would not work at all. Because the shaft can move in any direction, and the motor work requirements can only rotate axis. Impossible to achieve the transmission function, speaking theoretically not only so, bearing will affect the transmission, in order to reduce deck crane bearing the influence to achieve good lubricating the bearings on the high speed shaft, the bearing itself has lubrication, called pre lubricated bearings, and most of the bearings must be responsible for lubricating oil, when running at high speed, because of friction will increase energy consumption, more terrible is easy to damage the bearing. The sliding friction into the rolling friction is one-sided, because there is something called sliding bearing.

Agricultural bearings selection issues to consider

In the choice of the general bearing support to those problems? You can try the following four steps to consider:

How to define the axis position, including radial and axial position is the first thing to consider. General axis adopts double support structure, the radial position of the shaft joint is defined by the two support, centripetal or angular contact bearing supports radial location of each i effect. Axial displacement axial displacement axial position may be composed of two supporting the limit in one direction can be limited in two directions by a bearing, in general, the axial positioning in different ways can get different running accuracy. Therefore, the design of supporting structure should be based on the axis of the operation accuracy and working conditions, practical scheme of axial positioning.

At the same time bear radial load and axial load case, supporting often use mounting angular contact bearings and tapered roller bearings are. Angular contact bearings installed in pairs arranged in one of three ways. Two bearing outer ring width end relative installation called back-to-back mounting method. The two support force on self aligning bearing bearing span beyond. This arrangement for supporting span large, good steel shaft cantilever, axial thermal elongation, the outer ring is disengaged from the inner trend, so the shaft without jamming, so widely used. But if the pre installed in the shaft when heated, pre tension will be reduced. Two bearing outer ring narrow end relative installation called face to face mounting. The force point two support falls on the supporting span. This arrangement has the advantages of simple structure, installation, debugging convenient and therefore are more widely used, mainly for short axis and the temperature rise is not high, but it should be noted that we must have a spare clearance. The axial clearance also should not be too big, will reduce the running accuracy of the shaft. When the axial load is larger, the need for multiple bearings and bearing, agricultural bearings outer ring width is often used, narrow face relative installation series. Effect of the bearing force are located on the same side of the bearing are arranged in the same direction is also called series. The arrangement of this to the attention of the structure and manufacture to ensure each bearing can be as much as possible uniform load.

The machine is in operation, the general spindle or drive shaft temperature higher than the adjacent parts of the temperature, so the shaft will heat up elongation. In order to keep the shaft to rotate flexibly, in supporting structure design, while meeting the axial positioning accuracy requirements, but also consider the axial heat free expansion requirements. Axial positioning and axial expansion way is the corresponding.‍

The rotary support bearings

Turntable bearing its technology in the field of thrust roller bearing  in the first-class product is famous in the world. These mechanical components has been repeatedly proved its high load capacity, wide range of application and high cost benefit. Due to their design, a single bearing can support the radial, axial and oblique bending load. Therefore, in many cases, the bearing arrangement which can be replaced by the single bearing assembly into a radial and axial bearing. In many cases, it is largely in the adjacent structure design and bearing installation decreases the need for cost and effort. Wheel bearing double sealed, lubricated by grease of high quality, can through the lubricating nozzle re lubrication and easy to install. thrust ball bearing ring provides no gear, or bearing to achieve simple drive and provided with external or internal gear.

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The speed limit of angular contact ball bearing

Angular contact ball bearing speed increased restrictions is mainly because of the angular contact ball high speed bearing friction fever induced by internal temperature, when thespeed reaches a certain value, due to burn and cause cannot continue rotatingangular contact ball bearing. The speed limit of angular contact ball spindle bearing‍ is the frictional heating does not cause burns and continuous rotation of the boundaryvalues.

Therefore, angular contact ball bearing limit speed depends on the angular contact ball bearing type, size and accuracy and lubrication, lubricant quality, cage and type of material, loading conditions and other factors. All kinds of angular contact ball bearingswith grease lubrication and oil lubrication (oil bath lubrication) speed limit when contained in the angular contact ball bearing size table, its numerical representation standards for the design of the angular contact ball bearing under general loading conditions (C/P>=13, Fa/Fr<=0.25) limits when the rotation speed value.‍

What is the angular contact ball bearing

Angular contact ball bearings, thrust ball bearings to the heart that is usually said, the allowable working speed and deep groove ball bearing is similar, but the support rigidity ratio of deep groove ball bearing is stronger, mainly because of the bearingsteel ball is more, the radial load capacity than the ordinary ball bearing, but also bear large axial load or subject to pure axial load. The bearings are generally used in pairs,used for Small Span Rigid double supporting shaft or precision spindle, can improve the rigidity of the bearing system.

Can bear radial load and axial load for angular contact ball bearing. Can work at a higher speed. The larger the contact angle, the higher the axial bearing capacity. High precision and high speed bearings usually take 15 degrees contact angle. Under the action of axial force, contact angle increases. The axial load of single row angular contact ball bearings can bear a direction, in radial load, will cause additional axial force. The axial displacement of the bearing can limit shaft or shell in one direction. If quality.the installation, the outer ring of a bearing on the relative, the wide end of the wide face, narrow end face with narrow end. So to avoid the additional axial force, but also in the two direction of the shaft or shell limit in the axial clearance range.

Because of its inner and outer ring raceway can have relative displacement on the horizontal axis angular contact ball bearing, can bear radial load and axial load --combined load (single row angular contact ball bearings can only endure single direction axial load, mounting is often adopted to them).‍

Bearings

On the supporting part of the machine, in order to prevent the tapered bearing inner ring and shaft, the outer ring and shell hole relative slip occurred in the operation of the machine, must choose the right fit. A small amount of interference, will cause withsliding, lead to wear, damage to the shaft or housing surface, wear powder into the thin section bearing internal, will cause vibration and heating, and cause failure. The amount of interference is too large, will cause the bearing clearance work greatly reduced or completely disappeared, normal operation so as to affect the bearing or prematurefailure.

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