slewing ring bearings The need to use grease understanding several indexes

When the selection of products of a kind of grease when needed, we should first make clear the grease the role: antifriction, silencing, protection, sealing etc.. Antifriction grease, should consider the range of high and low temperature, load and speed; the silencing of mobile crane bearing‍ grease, should consider the adhesion, temperature range, load and speed and so on; protective grease, consideration should be given to the metal, non protective compatibility with metal; slewing ring bearings grease, should consider the compatibility and seal material. Also should be selected according to the structure and environmental products grease lubricating parts of different working conditions, comprehensive up the following main indicators:

Working temperature: 1 by low Taper roller bearings‍ temperature limit the lowest temperature of lubricating parts should be higher than the grease, otherwise it will increase the resistance of the highest temperature should be below the temperature limit; grease, otherwise it will lose because of grease lubrication capacity loss; the highest applicable temperature grease should be below the drop point 20 ~ 30 ℃.

2 speed: lubricating parts of the operation speed is higher, the shear stress of the lubricating grease is bigger, and the high speed dynamic mechanical temperature to rise quickly, easy to make the lubricant thinning and erosion, so we should select the consistency grease bigger.

3: according to the load slewing ring bearings‍ load is the key to ensure the selection of grease lubrication, lubrication points should be used for heavy load of base oil with high viscosity, thickened grease agent content is high; if can bear heavy load and shock load, bearing‍ should choose high extreme pressure and anti grinding grease resistance, such as the grease containing molybdenum disulfide.                                                                                               4 conditions: environmental conditions refer to the work environment and the surrounding medium lubrication points, such as air humidity, dust and corrosive medium. In contact with water or damp environment condition, can choose the grease of water resistance. Such as calcium, lithium base; harsh conditions, should be used with grease and rust, but should not use sodium base grease water resistance is poor; in the lubrication points with strong chemical medium environment, should be chemical resistant selection of fluorine element grease; in the environment with more dust, grease containing graphite thick optional; to seal with special requirements, should use sodium base grease.

5 cost factors: in the selection of grease, but also consider ship loader bearing‍ the economic use, comprehensive analysis using this grease is extending the lubrication cycle, charging times, fat consumption, bearing failure rate and repair cost.