ship loader bearing matching precision crossed roller bearing installation

In order to improve the matching precision crossed roller bearing installation, must use the measurement methods and tools do not make the bearing deformation, precision measurement of bearing inner and outer circle with the surface size of the actual project, the measurement can be related to the inner and outer diameters of all be measured, and make a comprehensive analysis of the measured data according ship loader bearing‍ to this, precision, matching with the shaft and hole of shaft

The installation part size. The distribution of shaft and hole in the actual measurement of the corresponding size and geometry, temperature and measurement should be carried out in the bearing under the same. To guarantee the higher actual tie effect, the shaft and hole matched with a bearing surface, the roughness should be as small as possible.

In the above measurement, should be in the outer circle and cross roller bearing inner hole, and the corresponding surface of the shaft and the seat hole, on both sides near the assembly chamfer, respectively two groups of marker can indicate the maximum deviation direction, so angular contact bearing‍ that in the actual assembly, so that the large deviation match two party aimed at the same azimuth, in this assembly, both of deviation to partially offset. Make two groups to purpose, is the deviation compensation can be considered, the rotating precision bearings on both ends of the respective even increased, and the bearing seat hole and both ends of the trunnion coaxiality error are partially eliminated. The mating surface to surface strengthening measures, such as sandblasting, precision plunger Thrust Ball Bearings‍ diameter slightly larger plug a hole, are beneficial to improve matching precision. Large and outer bearing surplus volume, in order to convenient installation, there also will be the outer circle and the bearing seat hole is made with a small taper, the installation on two square taper fit, and cover with control outer advance amount, the amount of interference in the predetermined range, while the end cover end face friction resistance of the outer end face also contribute to the fixed ring, to prevent the occurrence of peristalsis. This installation method is particularly convenient for bearing the vertical installation.

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mobile crane bearing Use of the bearing noise caused by improper solutions

1, the bearing dust

To solve the dust caused by noise method bearing: cleaning method can improve the bearing, bearing, shaft in the device, hole as well as the matching parts all mobile crane bearing‍ stern Qing Shen clean; two Su light slip foreign agent within three to improve the bearing; seal; four avoid the use of information is not pure or embedded foreign body plastic stick frame.

2, bearing a scar.

To solve the scar caused by the noise of the method of bearing: a device not knocking bearing, the bearing and shaft assembly after loading to avoid bearing Liner Motion Bearings‍ installed cable bearing seat; avoided shock vibration bearing corrosion and transport two inventory; three using the high viscosity of grease.

3, in case of improper bearing lubricant

To solve the lubricant due Thin section bearings‍ to improper noise method: improper bearing lubricant can be divided into three classes: the wrong lubricant; two lubricant lack; three lubricant aging induration. To choose the appropriate lubricant, lubricant according to the lubrication to add, to regularly replace the lubricant.                                                                                     

ferris wheel bearing holder of sound

Keep the free vibration of frame and the rolling body or ring phase impact will send this noise in the bearings rotate process. It may appear in all kinds of bearing, but its sound pressure level is not too high and the low frequency. Its characteristic is:

A. stamping cage and plastic holder can be generated.

B. either oil or grease will appear.

C. when the outer ring bearing ferris wheel bearing‍ the bending moment is most likely to occur.

D. radial clearance large easily.

Because the cage pocket clearance and the holder and the ring gap is inevitable in bearing product to exist, thus completely eliminate cage sound is very difficult, but can reduce the assembly error, gap optimum and cage movement to improve.

Another cage special taper roller bearing‍ sound is due to the holder and the other bearing parts leading between the rubbing surfaces caused maintain self-excited vibration and noise frame. Stamping of deep groove ball bearing retainer is thin, curved in the radial and axial in-plane stiffness is low, the overall stability is poor, will the bearings rotate at high speed due to bending deformation caused by self-excited vibration, "beep".

When the bearing under a radial load and oil Slewing drives‍ poor performance situation, at the beginning of operation "Kacha, Kacha hear noise", which is mainly due to the rolling body left in the load zone, noise suddenly accelerated and cage collision by rolling, the sound of impact can not be avoided but with running for a period of time will disappear.

ship loader bearing Non locating bearing roller bearing

Non locating bearing roller bearing used in vibration. Them to press fit mounted to the shaft, eliminating the friction corrosion which may be caused by axial clearance is not tight, self-aligning bearing system can also be formed with good performance and reliability.

Toroidal roller bearings can performance ship loader bearing‍ structure with smaller and lighter to achieve the same or better, for example in the planetary gear box. They simplify the bearing arrangement on the longitudinal axis of the larger temperature change. The use of this kind of bearing vibration are reduced, for example in the paper machine and fan. It is a long and slightly single row bearings symmetrical roller coronary. Bearing inner and outer ring raceway are concave in shape, around the bearing center symmetric distribution. Thus the best ship loader bearing‍ combination of raceway characteristics, load distribution in favor of bearings to reduce friction. Roller bearing with self-directed, regardless of whether the inner ring relative to the outer ring axial displacement and / or misalignment, roller is always in a uniform load distribution on the roller length spherical roller bearing ‍position. It's a very strong load capacity, even in has to compensate for angular misalignment or axial displacement. So, bearing layout in the operation is reliable, extended service life.

The performance of roller bearing.‍

Three factors determine the service life of the mobile crane bearing

Firstly, the structure design and advanced at the same time, there will be a longer mobile crane bearing life. Bearing manufacturing after forging, heat treatment, turning, grinding and assembly processes of operation. Treatment of advanced, rationality, stability will also affect the service life of bearing. Influence of process bearing heat treatment and grinding, often fault and bearing has a direct relationship related to the quality of the products. In recent years, the deterioration of the surface layer of bearing, the grinding process is close with the bearing surface quality.
Metallurgical quality of Triple row roller slewing bearing materials is the impact of the main factors of early failure of rolling bearings. With the progress of Metallurgical Technology (such as bearing steel, vacuum degassing etc.), improving the quality of raw materials. The proportion of raw materials quality factors of bearing failure analysis has dropped significantly, but it is still one of the main factors of tower crane bearing failure. Analysis of bearing fault selection must consider whether it is appropriate or.
Bearing after installation, in order to check for proper installation, to running inspection. Small machinery can be rotated by hand, to confirm whether the rotation is smooth. Check the project caused by foreign body, scars, indentation running sluggish, due to poor installation, mounting process arising out of the bad moment is not stable, because the clearance is too small, installation error, sealing caused by friction force is too large and so on. If there is no anomaly can begin power operation.

Reasons of ship loader bearing noise

One is the ship loader bearing inner, outer ring surface wear. Due to the wear, destroyed the fit between bearing and housing, a one-way bearing and shaft, causes the axis deviates from the correct location, the axis in high-speed motion noise.

When the Taper roller bearings fatigue, its surface metal flake, also bearing radial clearance increases the noise. In addition, insufficient lubrication of the bearing, the formation of dry friction, as well as bearing broken produces abnormal sound. After bearing wear loose, loose cage damage, also can produce abnormal sound of bearing damage.
Rolling bearing inspection is disassembled, can determine the fault and damage causes of one-way bearing according to the damage of bearing.
Constant pressure pretightening force is the so-called use coil springs, disc springs, given the appropriate preparation method of bearing. When in use, even if the changes in the relative position of bearing pre load, method. What types of seal bearing in use? It is even, the change of the relative position, pre load can also maintain a certain.

The speed limit ferris wheel bearing raceway noise solution

The speed limit is the maximum speed allowed in ferris wheel bearing load, lubrication condition, and the bearing type, size, load magnitude and direction, lubrication, clearance, cage structure and cooling conditions and many other factors.
Factors affecting the speed limit: load size, Slewing drives load type and direction, lubricant and lubrication method. Experience shows that: to improve the manufacturing precision, bearing the appropriate to increase the bearing clearance, the cage material and special structure, but also can improve the speed limit bearing.
The reason of high temperature of bearing: lubricating oil quality does not meet the requirements or deterioration, the oil viscosity is too high; mechanism assembly tight (spaces); one-way preloaded bearing; bearing race rotation on the shaft or shell; overload; bearing retainer or rolling body fragmentation. Guide roller, guide, slider, linear bearings, miniature ball bearings series of deep groove ball bearing series needle roller   bearings, thrust ball bearings
Rolling bearing is allowed in the work of the minor operation noise, if the sound is too loud or unusual noise or impact sound, it indicates that the bearing failure.

How to prolong the service life and / or performance of mobile crane bearing ?

First of all, the lubrication is the key. Selection of proper lubrication system and high quality lubricant. Oil film lubrication oil film bearing surface due to contact with each other apart, and provide the necessary protection of corrosion and wear, and so on all rotating or reciprocating parts, especially gear and bearing, for the normal mobile crane bearing ‍operation of the lubrication oil film, indispensable. As for the splash lubrication or circulating lubrication system, oil film can transfer heat. Factory always due to improper lubrication and unnecessary stop and equipment state of deterioration. Oil supply shortage will lead to increased wear and temperature rise, resulting in excessive wear and / or bearing early failure and damage. Lubricating excessive, especially high-speed operation of the equipment, the oil stirring generate too much heat, so that oil and chemical degradation, can also cause bearing damage.

Correct lubrication, regular maintenance, can avoid the problems caused by the damage of bearing lubrication. Ensure proper lubrication should be:

• follow equipment manufacturers as the guide to the use of each machine set;

• add grease, shall be filled into the bearing part and the shell (or ring), to ensure the adequate grease into the raceway surface, the key is fully lubrication;

• should notice when bearing grease (Re-lubrication);

Indicating instrument, monitoring equipment, in order to find the signs of problems as early as possible, such as temperature fluctuations and / or abnormal high temperature;

• equipment noise or vibration;

• to observe the leakage of lubricating oil;

• regular on lubricant sampling, and see if the pollution.

Secondly, such as the need to improve the bearing performance, reasonable adjustment is very important. Assembly or installation, such as bearing internal clearance is too large or too small, or in some cases, preload is too high, may lead to the early damage and bearing life expectancy. In addition to causing downtime and costly repair, bearing assembly and improper installation may also have more negative effects, marine crane bearing such as the impact of other parts of the operation, shorten the service life etc..

According to the device manufacturer's manual, assembly, installation and maintenance, is the best way to prevent the problem. If time is tight, can push forward the adjustment device to correct or remove shim, loose tapered roller bearing group. On the other hand, bearing adjustment too tight, may lead to overheating damage, to replace the bearings. Process assembly mounting bearings must be accurate, repeatable, and after installation can be verified. You must also consider the parameters of other parts, in order to optimize the system performance.

In addition, in accordance with the requirements of OEM to use the equipment, set as the lubricating oil or grease repair project monitoring and forecasting of right, which should include the failure root cause analysis. So, even if there is a problem of the equipment, its normal running time can be greatly extended.

Correct lubrication and maintenance is the key, the correct installation and use is also indispensable, and make full use of the existing condition monitoring equipment. Do not follow the requirements of installation and maintenance will cause equipment failure, which is a hidden danger of.‍

Bearing sealing device

The seal is to maintain good internal lubrication, and to prevent the cooling water, scale, immerse the impurities of working surface of bearing service life. Due to high temperature sealing roller bearings, bearing damage is the most close to the barrel side parts, bearing is frequently because of the lubricant pollution, erosion, make parts work surface wear, spalling and fragmentation, the failure of grease faster.

Seal is divided into self seal and outer seal two kinds of inch bearing. External seal mainly uses the design of labyrinth and contact combination. Maze level more (not less than two) gap smaller seal effect to be better. Labyrinth clearance according to the bearing size and radial unilateral 0.6 ~ 1.5mm, 4 ~ 6mm; axial.

Contact skeleton oil seal: it is widely used in the mill, in order to increase the effect can be two or three parallel use. The oil seal has the directivity, not anti loaded. The hot rolling mill general attire two oil, two oil seal lip mouth must to the bearing seat outside, prevent the outside dirt into the. An oil seal lip usually installed three seals bearing cold strip mill near the mouth to inward, to prevent the effect of rolling material quality lubricant overflow. Be careful to use the oil seal, avoid installed roller damaged lip, sealing effects.

RBR type sealing ring: This is one kind of tapered bearing special-purpose rubber lip type seal ring, and is widely used in recent years. The RBR sealing ring adopts an axial sealing way, the mouth is affixed to a surface, not affected by roll beating, old fat inside the bearing can overflow, cooling water, scale, impurities are prevented from entering the outer lip, with better sealing effect. And easy to use, change when you roll into roller bearing without any influence

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Bearing should not be adding too much grease

We know that the grease has good adhesion, abrasion resistance, temperature resistance, anti rust and lubrication, can improve the high temperature oxidation resistance, delay aging, can be dissolved carbon, prevent metal debris and oil binding, improving the corrosion resistance of mechanical wear resistance, pressure resistance and.

Understanding the movement process of lubricating greases in metric bearing, will naturally come to the conclusion: the grease for bearing too much. Grease much not only waste, but also harmful. The running speed of the bearing is higher, the greater the harm sex.

Grease filling in the friction torque, the larger. Filling quantity of the same, the friction torque of sealed bearing than open bearing. After grease filling amount equivalent to 60% of the volume of the inner space of the bearing friction torque, no longer increases significantly. This is due to open in the bearing grease most has been squeezed out, and sealing grease type bearings have leakage.

With the increasing amount of grease filled, linear increase the lift robotics bearing temperature, filling the same, but higher than the open bearing sealed bearing temperature rise.

Generally, grease sealed bearings filling amount, shall not exceed 50% of the internal space. Tests show that , ball bearing with 20% to 30% is the most suitable.‍

Bearing the use of the environment

Bearing the use of the environment: according to the size, accuracy of location and conditions of use and environmental conditions, with the right bearing is the premise to ensure the bearing life and reliability of the construction machinery bearing‍.

1, allowing speed: correct installation, lubrication good environment, allowing for 0.3-0.5 times bearing limit speed. Under normal circumstances, the limit of 0.2 times the speed of the most desirable.

2, using the site: combined load of deep groove ball bearing for radial and axial radial load to bear mainly on, usually with two sets of angular contact ball bearings are used,primarily in the car front and rear wheel, a driving bevel gear, gear, reducer and other transmission parts.

3, allow the tilt angle: tapered roller bearings are generally not allowed to tilt axis relative shell hole, such as tilt, less than 2'.

4, allow the temperature: under normal load, and the lubricant has the advantages of high temperature resistance performance, and full lubrication conditions, allowed to work in -30 ℃ -150 ℃ temperature generally angular contact ball bearing‍

Bearing high speed rotating matters needing attention

High speed rotating note:spherical ball bearings rotating at high speed, especially the speed ofapproach or exceed the speed limit size table records, should pay attention to the following matters:

(1) the use of precision bearing

(2) analysis of bearing internal clearance (bearing internal clearance consideringtemperature rise reduction)

(3) the analysis material of cage type (for high speed rotation, suitable for copper alloy or phenolic resin cutting holder. There is also suitable for synthetic resin forminghigh-speed rotating cage)

(4) analysis of lubrication (which is suitable for lubrication of high speed rotating,spray lubrication, oil mist lubrication and oil air lubrication, lubrication)‍