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718 series
2014-05-17

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2014-05-17

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2014-05-18

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"Crane Bearing"

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The crane structure
2015-03-04
The deck crane bearing hoisting mechanism, operation mechanism and metal structure.The hoisting mechanism of the crane, it are mostly composed of hanging system and winch, also have through the hydraulic system of lifting heavy objects. The running mechanism is used for the longitudinal horizontal migration of heavy loads or adjust the crane workin... The deck crane bearing hoisting mechanism, operation mechanism and metal structure.The hoisting mechanism of the crane, it are mostly composed of hanging system and winch, also have through the hydraulic system of lifting heavy objects. The running mechanism is used for the longitudinal horizontal migration of heavy loads or adjust the crane working position, the general is composed of motor, reducer, brake and wheels.  Metal structure is the skeleton of the crane, the main mobile crane bearing parts such as bridge, arm and door frame for the box structure or truss structure, but also for the web structure, and some can be used as a beam of steel. View Details
The history of the development of crane
2015-03-04
Ancient Chinese irrigation used is the embryonic form of boom type cranes.  In Fourteenth Century, Western Europe appeared in rotary drive unit jib type crane in human and animal driven.  In early nineteenth Century, a bridge crane. Important wear parts such as shafts, gears and spreader crane bearing began manufacturing is made... Ancient Chinese irrigation used is the embryonic form of boom type cranes.  In Fourteenth Century, Western Europe appeared in rotary drive unit jib type crane in human and animal driven.  In early nineteenth Century, a bridge crane. Important wear parts such as shafts, gears and spreader crane bearing began manufacturing is made of metal material, and began to use hydraulic drive.  In late nineteenth Century, steam driven crane gradually replaced the hydraulic driven crane.  Started in twentieth Century 20 time, because the electrical industry and internal combustion engine industry rapid development, electric motor or internal combustion engine for various crane power device basically formed. View Details
The introduction of rolling mill bearing:
2015-01-09
The working characteristics of high speed wire rolling mill bearings imports is in high speed, high impact condition of continuous and stable and reliable work, and have longer fatigue life. High speed wire rod rolling mill bearing abrasion resistance is stronger, can adapt to the high-speed rotation of the workplace. Rolling mill bearing four row ... The working characteristics of high speed wire rolling mill bearings imports is in high speed, high impact condition of continuous and stable and reliable work, and have longer fatigue life. High speed wire rod rolling mill bearing abrasion resistance is stronger, can adapt to the high-speed rotation of the workplace. Rolling mill bearing four row tapered roller bearings and double row cylindrical roller bearing two. Under normal circumstances, rough, rolling mill using imported four row tapered roller bearing, rolling mill using double row cylindrical roller bearing, rolling mill bearing level and plumb mill with same type. Whether the four row tapered roller bearings, or double row cylindrical roller bearing, the structure of the basic and traditional ball and roller combined bearing similar, but the design of various parts of full consideration of the lubrication and cooling problem, namely in the inner ring, outer ring, a spacer ring (the four row tapered roller bearings are concerned), cage, double row cylindrical roller (on roller bearings for there are many open slot hole), etc.. Thus, groove, hole formation of lubricating, cooling channel and the bearing seat, on the roll channel constitute a reliable lubrication View Details
Causes of bearing raceway noise tapered roller
2014-12-09
Raceway sound is due to the tapered roller bearing rolling elements in the raceways when rolling rotation inspire a smooth and continuous noise, the level or tone when aroused great attention only when. In fact, inspired by the sound of the raceway sound energy is limited, such as in normal circumstances, the quality of  bearing raceway sound ... Raceway sound is due to the tapered roller bearing rolling elements in the raceways when rolling rotation inspire a smooth and continuous noise, the level or tone when aroused great attention only when. In fact, inspired by the sound of the raceway sound energy is limited, such as in normal circumstances, the quality of  bearing raceway sound for 25 ~ 27dB. This noise to withstand radial load single direction thrust ball bearing is the most typical, it has the following characteristics:. a noise and vibration is random;. b vibration frequencies above 1kHz;. c irrespective of speed changes, the noise is almost constant and dominant frequency sound pressure level is increased with the speed increase;. d When the radial clearance increases, the sound pressure level increased dramatically;. e bearing rigidity increases, the lower the overall sound pressure level, even if the speed increases, the total sound pressure level has increased little;f. The higher the viscosity of the lubricant, the lower the SPL, but for grease lubrication, its viscosity, soap fibers can affect the shape and size of the noise level.Raceway sound source is generated by the ring after the natural vibration loads due. Because the elastic contact rings and rolling elements constituting nonlinear vibration systems. When lubrication or machining accuracy is not high when it will stimulate the natural vibration characteristics associated with this elastic, passing into the air then becomes noise. As we all know, even with the highest levels of contemporary manufacturing techniques tapered roller thrust roller bearing parts, tiny geometric surface error of their work will always exist varying degrees, so that the produce between raceways and rolling elements tiny fluctuations in the natural vibration excitation vibration system.Although  bearing raceway noise is inevitable, however, can take high-precision machining parts work surface, the correct selection of bearings and precision bearings make use of noise damping.The so-called burn injuries appeared bearing status means: wheel bearing raceways, rolling elements and a cage in the rotation until the sharp heat discoloration, softening, deposition and damage.The main reason for tapered roller bearings burns due to poor lubrication of bearings may use informal lubricant or lubricant too much, too little, is not correct.Second is probably too big load (preload is too large). Speed is too large. Clearance is too small. Water or other foreign matter intrusion. If the above two cases is that the shaft is not so bad precision bearing housing, shaft deflection big. See here, I think we all want to know the solution of it, first of all, to study the lubricant and lubrication method, the election of the bearing lubricant, and its amount, but also to correct the  bearing selection. Research to tie, bearing clearance and preload and improved seal. Check the shaft and precision bearing housing. Of course, if you are next to some experts, then let him go with the best of the operation you!Recommends the use of tapered roller tower crane bearing, pay attention to the installation, lubrication, clearance and other aspects are done as accurate as possible, in place.  View Details
Rolling bearing packaging
2014-12-04
Since the beginning of the packaging and packaging ferris wheel bearing the packaging.Bearing in manufacturing completed and passed the test, namely cleaning and anti-rust treatment, then put the package in order to achieve waterproof, moisture, dust, shock, maintain quality and precision bearings and to facilitate the use and sale purposes .Bearin... Since the beginning of the packaging and packaging ferris wheel bearing the packaging.Bearing in manufacturing completed and passed the test, namely cleaning and anti-rust treatment, then put the package in order to achieve waterproof, moisture, dust, shock, maintain quality and precision bearings and to facilitate the use and sale purposes .Bearing packaging by rust into three categories:① short rust Packaging: rust period of 3 to 6 months, for high-volume shipments to the same subscriber, will be put into use in the short term bearing. By mutual agreement, in order to facilitate the use of the principle, the use of simple packaging.② general rust Packaging: Rust period of one year for general purpose bearing.③ long rust Packaging: rust period of two years, applies to private and precision marine crane bearing.Bearing polyethylene plastic tube packaging materials (boxes), kraft paper, plain and wrinkles polyethylene composite paper, cartons, polyethylene or polyethylene plastic film, plastic woven nylon fastening tape or fastening tape, waterproof high-strength plastic tape , sacks, etc. These materials are required to ensure that the corrosion resistance of the material can test pass. View Details
Precision Bearing Installation
2014-11-19
1. Precision bearings to match the mechanical demands on precision bearings due to their accuracy at 1μm or less, thus requiring its matching parts (shafts, housings, end caps, ring, etc.) have a high dimensional accuracy and shape accuracy, especially mating surfaces To control the accuracy of the bearing within the same level, which is crucial, ... 1. Precision bearings to match the mechanical demands on precision bearings due to their accuracy at 1μm or less, thus requiring its matching parts (shafts, housings, end caps, ring, etc.) have a high dimensional accuracy and shape accuracy, especially mating surfaces To control the accuracy of the bearing within the same level, which is crucial, and the most easily overlooked.You must also pay attention to match the mechanical precision bearings if not meet the above requirements, often makes precision bearings bearing error occurs several times larger than the original after installation, even 10 times higher than the error, completely ceases precision bearings, because the match machine Error member is often not simply superimposed to the bearing errors, but in a different multiple of the amplification after the additions.2. Precision bearings fit in order to ensure the thrust roller bearing after installation without excessive deformation must do:(1) The roundness of the shaft and housing bore and a shoulder block verticality precision bearings should be in accordance with the appropriate requirements.(2) necessary to accurately calculate the amount of interference with the rotating rings, but also accurately calculate the appropriate amount of fixed ferrule.Rotating rings blanch the amount of interference to the extent possible should be made also small. As long as the effects of thermal expansion and ensure the operating temperature, and the maximum speed under the influence of centrifugal force, so as not to cause a tight fit creeping or sliding surfaces. Fixed according to the work load of the size of the rings and bearing size, select a very small clearance fit or interference fit, too loose or too tight is not conducive to maintaining the exact original shape.(3) bearing as running at high speed, and high temperature, special attention should be rotating rings can not be too loose to prevent the tie appear eccentric, and a gap can not be fixed ferrule to prevent the ferrule deformation under load and vibration excitation.(4) Effect of fixed ring take a small interference fit condition is to match the shape of the surface of both sides have high accuracy and less roughness, or cause installation difficulties and disassembly harder, also need to consider the thermal elongation of the spindle .(5) pairs of angular contact ball bearing spindle, mostly lighter loads, such as its relatively large amount of interference with, its internal axial preload amount will be significantly larger, resulting in adverse effects. Use double row cylindrical roller bearings and tapered roller bearings spindle spindle, whose load is relatively large, so its interference with relatively large.3. Improve the practical with the precision of the method in order to improve real time with precision bearing installation, you must not make use of measurement methods and tools bearing deformation of the bearing bore and the outer dimensions of the actual mating surface precision measurement may be related inner and outer diameters of the measurements all be measured, and the measured data to make a comprehensive analysis of this as far as precision worthy of the shaft and housing bore bearing mounting portion size. In the actual measurements made with the corresponding dimension of the shaft and housing bore and geometry, the measurement should be carried out when the temperature of the bearing under the same conditions.To ensure a high practical effect with the surface of the shaft hole and the precision spindle bearings and the seat to match, the roughness should be as small as possible.In making these measurements, should be in the outer and inner bore of the bearing, and the upper surface of the shaft and the corresponding housing bore, on both sides of the assembly close to the chamfer, respectively can be made showing the direction of the maximum deviation of two marks, so that In the actual assembly, so that the maximum deviation of the two sides match aligned in the same position, so that after assembly, the two sides of the deviation can be partially offset.The purpose of making two directional signs, that can compensate for deviations into account, even if the two ends of the supporting respective rotational accuracy is improved, and the seat bearing bore and between the two ends of the coaxial error journal partially eliminated. Implement measures to strengthen the surface mating surfaces, such as sand blasting, with a diameter slightly larger than the precision plug the hole once the plug column, etc., are beneficial to improve fitting accuracy.  View Details