mobile crane bearing Using electric force

Using electric force, magnetic force of the shaft suspension sliding bearings. Electric field force is electrostatic bearing suspension with magnetic force suspension of magnetic bearings (see figure), electric field strength and the magnetic field strength is combined together suspension bearings. A mobile crane ‍bearing both electrodes have the poles in the circuit connecting the capacitor and inductor corresponding to each Liner Motion Bearings‍ other tuner, the stiffness is much higher than the first two, and the corresponding displacement of the maximum force is very small. Electromagnetic bearings for shaft and bearing no direct contact, no lubrication, can be in a vacuum and over a wide temperature range, friction is small, not the speed limit (some speed up to 23 million rev / min line speed of up to three times the speed of sound), long life, the structure can be diversified. Static bearing requires a lot of field strength, the application is limited, use only a few meter. Magnetic bearings with a larger carrying capacity and stiffness, have been used in ultra high-speed trains, ultra high-speed centrifuges, hydro, spacecraft angular momentum flywheels, flow meters, density meter, power meter, vacuum pumps, precision current regulator and gyroscopes. With the development of magnetic and electronic technology, marine crane bearing‍ electromagnetic bearing applications are growing.

Electric force and electric field strength, electric displacement and the electrode area is proportional to the magnetic field strength and the magnetic field strength is proportional to the magnetic flux density and magnetic area. Select the appropriate electric or magnetic field parameters and geometry, get some bearing load capacity and stiffness. Electrostatic attraction between the magnetic attraction is inversely proportional to the square or the distance of the object, according to Hugh Aner theorem, this system is statically indeterminate statics, so in addition to the use of anti-bearing outer magnets or superconductors, in the electrostatic field or static magnetic field work bearing is unstable. For the magnetic bearing is stable, servo device or method must be used to adjust the circuit parameters control. conical bearing‍ The actual use of the general magnetic bearing by radial bearings, thrust bearings, servo-control loop, dampers, speed sensor or position sensor and other components.

ship loader bearing Wheel bearings

Wheel bearings are used in automotive axles for load-bearing and rotating at the hub of providing precise guidance components, both axial load and radial load, is conical bearing‍ an important part of the car load and rotation.

Traditional automotive wheel bearing is composed of two tapered roller bearings or ball bearing combination, bearing installation, oiled, sealed and adjust the clearance is carried out in the car on the production line. This structure makes it difficult in a car assembly plant, high cost, poor reliability, and maintenance car maintenance, but also the need for bearing cleaning, oiling and adjustment.

Wheel Hub Bearing

In standard angular contact ball bearings and tapered roller bearings developed on the basis, it sets bearing as a whole, with good assembly performance can be omitted clearance adjustment, light weight, compact structure, large load capacity, for can advance into the grease sealed bearings, seals and hub maintenance omitted from the outside wheel, etc., have been widely used in cars, and in the truck also has a tendency to gradually mobile crane bearing  ‍expand the application.

History

Car wheel bearings are used in pairs over a maximum single row tapered roller or ball bearings. With the development of technology, the car has been widely used car wheel unit. The growing scope and use of hub bearing unit has now developed to the third generation:

The first generation is a double row angular contact bearing components.

The second generation of the outer raceway Liner Motion Bearings ‍for bearing a fixed flange bearing sleeve may simply be fixed with a nut on the axle. Makes the car maintenance becomes easy.

The third generation wheel hub bearing units are using a bearing unit and ABS anti-lock brake system compatible. Wheel hub unit designed to have the inner flange and an outer flange, the flange is bolted to the drive shaft, the outer flange of the bearing mounted together.‍

LYHY ferris wheel bearing Mobile rotating crane

In the span of a large crane loading and unloading requirements, but I hope not too long crane boom situation, often using mobile rotating crane. Mobile cranes along the ship's rotation and longitudinal movement of two kinds of lateral movement.

Gantry Cranes

This crane is a full container ship (see container ships) self aligning ball bearing‍ and load barges are widely used, usually four-legged type or C type. There is an extendable boom, lifting rungs and a removable tray and cab. Higher levels of bridge girders stowed on the deck of the container, and automatic positioning device, when shipping containers can be placed exactly fall in separate compartments or containers stacked on deck. The number of gantry crane barge load containers on board more than that, from the weight of up to several hundred tons.

Other handling machinery

There are lifts, elevators and conveyors. Boat lift is a vertical movement of the machine along the rails for lifting and lowering between each deck cargo use. Such as multi-use lift decks connected to the delivery of goods on the ro-ro. There lift scissor on ro-ro, chain and several species, its length is 9 to 18.5 meters, a width of 3 to 5 meters. Also installed on some carrier barge loading and unloading cargo barge lift, but lifting capacity is single direction thrust ball bearing‍ much greater than on the ro-ro ships. Hoist is larger in the vertical direction or inclined direction of the continuous movement of goods. Conveyor is a little slope in the horizontal direction or the direction of the continuous delivery of goods. Both mechanical dump is used in loading and unloading of a ship or boat through the side door.

LYHY ferris wheel bearing The bearing temperature are the main reason

The first: whether the lubricating oil quality deterioration? If the viscosity of lubricating oil can also result in INA bearing temperature rise

Second: bearing Angular contact ball bearings‍ assembly if too tight, the gap will lead to inadequate flange bearing temperature rise;

Third: bearing assembly too tight will result in bearing temperature rise;

Fourth: Race rotation on the shaft or shell will result in bearing temperature rise;

Fifth: the bearing load is too large will Excavator Slewing Bearing‍ result in bearing temperature rise;

Sixth: if the bearing cage or a rolling body broken words, will result in bearing temperature rise.‍

ship loader bearing thrust tapered roller bearing

Separation type bearings. A design of the shaft ring and ring raceway and roller rolling surface of the conical surface vertex to the center needle roller bearings‍ line. A one-way bearing can bear axial load, two-way two-way bearings can withstand axial load.

12, the needle roller bearing

The roller length (L) and roller diameter (Dw) than L/Dw > 2.5 and roller diameter (Dw) < roller bearing 6mm is referred to as the Crossed Roller Slewing Bearing‍ needle roller bearing.

12.1 needle bearing radial size is small, but the radial load carrying capacity is very high, can not bear the axial load, use only as a free end ship loader bearing. Lightweight, miniaturization is beneficial to device.

Needle roller bearings without inner ring 12.2 with or without outer ring, only keep the needle assembly frame, the machining accuracy requirements, the match of the journal and bearing seat hole surface hardness should be the same with the bearing Slewing drives‍ ring rolling.

The coefficient of friction of 12.3 needle bearing large, not suitable for high speed.‍

mobile crane bearing self-aligning ball bearing

The 8.1 outer raceway is spherical, with self-aligning properties. Because the processing installation and shaft bending causes for the mobile crane ‍bearing seat hole is not concentric with. Adjust the skew angle is within 3 degrees.

Small metric bearing‍ angle 8.2 bearing contact, almost invariant under the action of axial force, the axial bearing capacity is small. Mainly bear radial load, the radial load at the same time, can also be

A small amount of axial load, limit the speed ratio of deep groove ball bearing low.

9, four point contact ball bearing

Detachable type structure can bear radial load, two-way axial load, axial displacement can be limited in two directions, angular contact ball bearing axial space but more than double the size of the angular contact ball bearing occupies little single Spherical roller bearings‍ bearing can replace the front or back of the combination of portfolio. Because of double half inner (or outer ring), ball number, with larger bearing capacity. Four point contact ball bearing axial, radial loads applied to bear pure axial load or axial load in. Compared with the bearing and the other ball bearings, when

The radial clearance and axial clearance, smaller, higher limit speed. In normal working condition, the axial load bearing any direction, can form a contact angle, ball and inner, outer raceway each contact point, to avoid the occurrence of sliding friction contact zone. Therefore, the bearing should not be subjected to radial force and load.

10, spherical roller bearing

The outer ring raceway is a part of the spherical bearing, with internal self-aligning performance, adaptation to relative deflection of shaft and Angular contact ball bearings‍ housing bore. Can bear radial load and shock load, but also can bear bidirectional certain axial load. The axial displacement of the bearing can limit shaft or shell in bearing axial clearance range. This kind of bearing structure principle and characteristics and self-aligning ball bearing the same load, the capacity and the speed limit's permission, can be interchanged. Tapered bore bearing by using fasteners or unloading easy axis of the folding.

ferris wheel bearing Cross cylindrical roller bearing

Cross cylindrical roller bearing friction vibration often have a direct relationship with the grease properties. When the grease performance is Full complement cylindrical roller bearings‍ not good or not clean, then prone to friction vibration, but also with the rolling bearing raceway machining quality, if this processing method is adopted for special precise, can better control the friction

Vibration. Crossed roller bearing vibration basically is caused by the vibration of bearing rings, and the bearing structure, rigidity, Angular contact ball bearings‍ precision manufacturing, installation conditions and usage and other factors. If the bearing inner race with radial of the ripple of the inner ring road, outer ring rotation axis will produce radial vibration. Cross rolling

Corrugated bearing inner ring will not only cause the radial vibration of the outer ring, and

Also by the axi‍al vibration of bearing outer ring, will make the axial bearings, the relative position change under axial load, therefore the thrust in the inner rotating cylindrical roller bearing outer ring also produced axial vibration export shaker at work, for bearing high speed rotation, because the thrust roller bearing‍ ripples caused by moving the frequency, there may be equal to the rotational frequency of vibration exciter shaft, which produce resonance.

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mobile crane bearing axial bearings

Also by the axial vibration of bearing outer ring, will make the axial bearings, the relative position change under axial 

One, keep the slewing bearing‍ bearings and the surrounding environment clean even the eyes can not see the tiny dust entering the bearing, can also increase the cross roller bearing wear, vibration and noise. Bearing and its peripheral accessories should be kept clean, especially the dust and dirt, tools and working environment must be kept clean.

Two, use the installation carefully do not allow powerful punch, do not allow the use of hammer percussion, direct bearing, not allowed to pass through the rolling pressure.

Installation tool three, use the appropriate, accurate as far as possible the use of special tools, the use of fabric and fiber or something to Single Row Ball Slewing Bearing‍ avoid.

Four, to prevent the corrosion of bearings directly by hand to take bearings, should wash hands sweat, and coated with high quality mineral oil before operation, during the rainy season and summer with particular attention to anti rust. However, in some special operating conditions, the bearing can have a longer life expectancy in traditional computing, especially in the light load conditions. These special operating conditions, when the rolling surface

(raceway and roller may cause surface damage) single direction thrust ball bearing‍ is a lubricating oil film to effectively separate and limit pollutants. In fact, in ideal conditions, the so-called permanent bearing life is possible.

ship loader bearing bearing lubrication

Causes and failure analysis of the bearing failure of bearing lubrication

Bearing lubrication is important for normal bearing, must strictly control the use of lubrication conditions in order to guarantee the Taper roller bearings‍ precision bearing and stable life. Cause the failure of bearing lubrication are mainly in the following aspects, this paper focuses on the analysis of.

1.... interrupt bearing oil supply system: the majority of ball bearings and roller bearing failure is due to the ship loader ‍bearing lubricant interrupt, or lubricating mechanism can not effectively lubricant properly transported to the roller and raceway contact area; in order to engine failure fatal fault aviation engine main shaft bearing, retainer after silver Excavator Slewing Bearing‍ ball handling and the roller in the lubricant, temporary interruption, some silver will be transferred to the raceway, add lubrication to provide low coefficient of friction; friction coefficient ceramic roller bearing is better than the low friction coefficient of bearing steel. Cross roller bearings

2 thermal imbalance: at the height of the bearing in operation, the rolling body, ferrule, maintain the temperature difference between the frame must be strictly controlled, to avoid bearing radial preload is too large, it will cause the rolling elements and raceways frictional heating increased, if the outer ring of the bearing inner ring radiating aluminum above, will cause too much friction bearing lock; firstly causes lubricant oxidation and degradation, lubricants and lubricant friction increases self aligning ball bearing‍ blackening; overheating will cause parts of the surface chemical precipitation; with the increase of the temperature of the bearings, bearing rings and rolling elements of steel hardness will decline, spring will be reduced, resulting in plastic deformation;

ferris wheel bearing The so-called bearing

The so-called bearing internal clearance, which are not installed on the bearing on the shaft or bearing box, a fixing the inner or outer, then that is not a fixed one measuring radial or axial movement of the mobile. According to the movement taper roller bearing‍ direction, radial clearance and axial clearance can be. Crossed roller bearing internal clearance choice points called bearing internal clearance, which are not installed on the bearing on the shaft or bearing box, a fixing the inner or outer, then that is not a party to the fixed

The amount of axial movement of the mobile or. According to the movement direction, can be divided into radial clearance and axial clearance. On the measurement of bearing clearance in the interior, in order to make the measurement wind power bearing‍ value is stable, general test load was applied in the ring. Therefore, the test value than the actual clearance value, namely one more test applied load and elastic deformation. Bearing clearance operation, because the bearing with inner and outer rings and cause temperature, than the initial clearance of small. Running clearance and the ferris wheel bearing life, Wen Sheng, vibration and noise are closely related, so it must be set to the best state. Turntable bearings theoretically, bearing in operation, with negative clearance operation, the maximum bearing life. But it is very difficult to maintain the best clearance. With the change of the conditions of use, the negative clearance of bearings will increase, thin wall bearings‍ leading to the bearing life is significantly reduced or have a fever. Therefore, the initial clearance of bearings is slightly greater than zero.

mobile crane bearing Crossed roller bearing

Crossed roller bearing assembly points and quality measures

Thin-walled cross roller bearings according to its structure, the assembly stage needs to grasp the bearing clearance control, rotary accuracy Taper roller bearings‍ and stability of 3 points, cross roller bearings belong to special bearings with high precision, is mainly used in CNC machine, robot arm, as well as medical and military equipment, which are double row roller in a 45 degree tilt angle roll cross distribution channel, can maintain high rigidity on the roller and raceway contact line, but also because of a 45 degree tilt angle raceway can be uniformly load of axial and radial bearing, perfect overturning or torsional moment; in addition, cross roller bearings with negative clearance design and pre tight, can high rigidity bearing rotary bearing‍ guarantee (compared with traditional models, rigid increase 3~4 times) and high precision, cross roller bearings precision Luoyang Boying bearing is in P5 above, basic accuracy of P4, P2.

ship loader bearing crossed roller bearing

crossed roller bearing clearance control bearing production processes in the two process to ensure the bearing clearance, a bearing end grinding, roller bearing sleeve so need beforehand medium size of test equipment, test equipment with rotary marine crane bearing‍ bearing is smooth, the negative clearance has a slight pressing feeling, can ensure the roller and the raceway with clearance at around 0.01mm, preparing for the next assembly; second procedures for fitting test equipment, the bearing does not install the isolation block or holder of test equipment, there are 5 groups of roller for choice, according to the assembly member feel and a dial indicator measuring judgment clearance is required, if don't be by replacing the roller and raceway grinding to finish the match, this method can also be used in the production of the turntable bearing YRT, is commonly used in bearing production method, just cross roller bearings are rotary bearing‍ precision bearing, clearance requires precise control;

2 rotary accuracy and stability control; through production practice experience for many years we know, rotary precision cross roller bearings and YRT turntable bearing mainly, and the raceway quality and deformation, therefore, all bearing before shipment is half finished product assembly, prevent long after placing deformation, and thin-walled cross roller bearings in the grinding time by tempering 2 times treatment, ensure the material stress release caused by deformation of the risk to a minimum; the actual assembly of a rotary impeded, the bearing cleaning, check whether there is damage raceway, then the Spherical roller bearings‍ accuracy of roundness and flatness.

Measuring, Cengcengbaguan to ensure the bearing quality.‍

ferris wheel bearing selected bearing

Fatigue life test is to maximize the full lubrication abrasion factor inhibiting the bearing load and speed, the enhancement to an enhanced fatigue life test method for outstanding ferris wheel ‍bearing fatigue factors.

The calculation and test of metric bearing‍ fatigue life of bearing fatigue life is complementary, the two results are corresponding enough. But in reality, such as for each specific occasions, all selected Boying bearing a sufficient number of life test, to verify the selected bearing is suitable or not, this is very big in the economy, time and amount of labor, so the life test of automotive bearings only is used in a very necessary or important case, in most cases, the standard life calculation method to estimate the service life of the bearings, with a sufficient degree of dependency. To predict the fatigue life of bearing, determining the remaining life, need to understand the bearing fatigue all the failure phenomenon, so it will take a long time. However, because the rolling fatigue fatigue at the contact point under robotics bearin wind power bearing‍ compressive stress occurs, to achieve the damage will occur great change of materials. Therefore, in addition to extend prior to material changes in surface cracked, raceway suffer chemical effect, crack cases, detection of material changes may judge the vehicle bearing fatigue. The main reason is the defect of bearing fault off the overload two elements. When the load across the material strength and the formation of broken parts called overload fracture. The reason is mainly from the sudden overload machine fault or install. Are defects cause fracture can be bearing parts of the micro cracks, shrinkage, bubbles, large foreign things, organizations and local overheating burn defect is shock overload or violent vibration, known as the defect fracture. It should be noted that, automobile bearing is process, the materials into the factory inspection, casting and heat treatment quality taper roller bearing‍ control, process control and instrument for the precise analysis of the defects can be through with no, then must still strengthen control.

But in general, the failure of most overload bearing fracture usually.‍