Lubricating oil, grease of simple and easy to identify - bearing knowledge

Equipment maintenance, often need to judge the quality of the lubricating oil, grease, and the equipment movement situation, the influence of the cause of the problem. Analysis the condition of no tests, using some simple identification method, it is necessary to clearly. 1. Simple and easy to identify oil ( 1) Viscosity test: usually the equipment has been used lubricating oil and equipment need to use standard viscosity of lubricating oil, the method of comparative analysis, to determine whether you need an oil change. 1) On a clean piece of glass, respectively, a drop of lubricating oil for inspection of lubricating oil and standards. Will drip, flat glass. After good oil drops, tilt the glass again, pay attention to compare this oil DiLiu down speed and flow in the distance. Velocity, flow distance, relative viscosity is smaller. If the speed is roughly same, flow close to the distance, the level in the oil viscosity is likely to be the same or close. 2) Use two of the same diameter and length of glass tube, a loading waiting for an oil change, another load standard of lubricating oil. Requires two in vitro oil to the same height, and may not be full, set aside a bubble. Then use cork plug tube mouth, connect the two tubes together, velocity inversion 180 degrees at the same time, the velocity of bubble rising in vitro. Bubble rising fast in vitro in lubricating oil, viscosity is small; Bubble rising slowly tube can load of lubricating oil, viscosity is large. If you want to judge inspected oil is close to that a brand of oil, can be used in several known brand of oil respectively comparing with waiting for the oil. When the velocity of bubble rising both close to, can from the viscosity, the quality of the two kinds of oil. ( 2) Moisture test 1) Put waiting for inspection of oil in the dry in vitro, and then in a test tube heating to 100 ~ 120 degrees, at the bottom of the heating and observation. If the presence of moisture in the oil, sound, bubbles, or in the condensation on the walls of water, and the oil into a muddy state, etc. 2) Put inspected oil in vitro, then add a small amount of white powder crystal copper sulphate anhydrous, if there is water in the oil, immediately into the blue, and the precipitation in the bottom of the tube. 3) Use a clean, dry the veil of dip after inspected oil fire with fire. If there is water in the oil, or flash explosion phenomenon occurs. ( 3) Mechanical impurities test 1) Low viscosity oil can be injected directly into the test tube, heating after the stationary observation. If see precipitation or suspended matter, oil has a mechanical precipitation. 2) Larger oil viscosity can be diluted with a clean gasoline 5 ~ 10 times, according to the above method to identify. Also can be diluted with filters, if by mechanical impurities, will be retained on the filter paper. 2. Grease of simple and easy identification in the process of equipment maintenance, to identify the quality of grease, mainly for the nature of the change, whether mixed with impurities. ( 1) Fiber network structure damage identification: grease grease fiber network structure in the event of damage phenomenon is to adhesion, lower the lubrication performance. Identify, grease can be coated on a clean piece of copper, and then into the big containers of water are in the rotation, after many rotation, if the surface appears oil bead, then checked fat fiber network structure has been destroyed. Obviously this method is only suitable for the water resistance of grease. ( 2) Water resistance identification: fat, if it is not clear how the water resistance, available fingers take a small amount of fat, a little water drop, with a little twist, if be fat emulsion occur quickly, can be judged to be sodium base grease. If emulsifying phenomenon does not occur, can judge is calcium base grease or lithium base grease, or barium base grease. If the emulsion is slow and incomplete, it can be judged is sodium calcium base grease. ( 3) Presence of impurities in the identification of 1) With your fingers to twist the fat a little pressure, by feeling whether checked fat in mixed with hard particles. 2) The lubricant evenly coated in a clean glass, coating thickness thin at 0. 5 mm or so, in the light to observe, the judgment is whether the samples in the fat pellet impurity. 3) Take a small amount of fat in the test tube, to gasoline to dissolve, observe whether precipitation. 4) Identify whether the oxidation: in the oxidation of lubricating grease, can see clearly from the appearance. At this time, the color of the fat black or deepen, and form a hard film on the surface.