Control friction: add lubricant between friction surfaces to form lubricating film and reduce direct metal contact between friction surfaces, so as to reduce friction coefficient, friction resistance and power consumption.Main Functions of Lubricants
2. Reduce wear: the lubricating film with certain strength between the friction surfaces can support the load and avoid or reduce the direct contact of the metal surface, so as to reduce the adhesive wear of various degrees such as plastic deformation, melting welding, cutting and re bonding of the contact surface.
3. Cooling: the lubricant can reduce the friction coefficient and reduce the generation of friction heat.
4. Sealing and isolation: lubricant, especially grease, covers the friction surface or other metal surface, which can isolate the contact between water, moisture and other harmful media and metal, so as to reduce corrosion and wear, prevent rust and protect the metal surface.
5. Reduce bearing: the lubricant can convert the mechanical energy of impact vibration into hydraulic energy, which can slow down the impact and absorb noise.
If the amount of grease is too large, the friction torque will increase, the temperature will increase, and the grease consumption will increase; If the amount of grease is too small, reliable lubrication cannot be obtained and dry friction occurs. Generally speaking, the appropriate amount of grease is 1 / 3 ~ 1 / 2 of the total void volume in the bearing. However, according to the actual situation, sometimes the bearing edge should be greased and cavity lubrication should be implemented.
Avoid the cross use of grease containers and tools, otherwise it will have adverse effects on grease, such as drop point drop, cone penetration increase and mechanical stability decrease.Main Functions of Lubricant
As the variety and quality of lubricating grease are constantly improving and changing, when the old equipment changes to new lubricating grease, it should be tested first and can be officially used after trial; When replacing with new grease, first remove the waste grease and clean the components. When adding lubricating grease, the waste lubricating grease shall be squeezed out until new lubricating grease is seen at the grease discharge port.
Lubricating grease can reduce mechanical friction bearing, prevent metal aging and prevent air leakage, oil leakage and water leakage, so as to ensure the normal operation of mechanical equipment. When selecting lubricating oil, the following factors should be considered:Main Functions of LubricantsMain Functions of LubricantsMain Functions of Lubricants
Temperature: the temperature has a great influence on the grease. If the environment and mechanical operation temperature are high, the grease with high temperature resistance shall be selected.
Speed: the temperature rise of high-speed parts is high and fast, which is easy to dilute and lose the lubricating grease. The lubricating grease with high consistency should be selected.
Load: since the cone penetration of grease is related to the load that can be borne during use, the grease with small cone penetration (high consistency) should be selected for heavy load; If it bears both heavy load and impact load, the grease containing extreme pressure additives shall be selected, such as the grease containing molybdenum disulfide.
Requirements for special parts: selected according to different mechanical working environment. Grease with strong water resistance shall be selected in humid environment; In the dusty environment, use thick lubricating grease containing graphite; In acid containing environment, warp base grease is selected; If there are special requirements for sealing, barium based grease shall be selected.Main Functions of Lubricants
Lubricating with grease is an effective measure to improve the antifriction and anti-wear performance of moving parts of construction machinery. Due to the particularity of the service environment of construction machinery, its service life is greatly affected and the service performance of the whole machine is seriously affected. Therefore, only by recognizing the failure mechanism of lubricating grease can it be used correctly.
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