What should I do if the coal mill gearbox lubricating oil produces foam?
June 30, 2022
1. Lubricating oil to produce the harm of foam 1) The compression of lubricating oil is large, the efficiency of oil pumps decreases, and the oil supply is abnormal or the fuel supply system has gas resistance. As a result, the frictional area is broken, resulting in wear or sintering. 2) Make lubricating oil from overflowing from the breathing hole and oil injection pipe or displaying fake liquid surfaces in the oil surface indicator, resulting in insufficient fuel supply. 3) The area of contact with lubricating oil and air becomes larger, prompting oil products to accelerate oxidation and deteriorate, and shorten the service life. 4) The lubricant filled in the container is reduced to extend the time for the foam disappearance. If used in the oil compressor, the hydraulic system will be unstable, the cooling capacity decreases, the power and speed foam will be generated, the surface tension of lubricating oil decreases, the equipment is tensile and the facial shape is not the oil film. Causes break.
2. The reason why lubricating oil produces foam The design of the fuel tank is unreasonable, and the oil pollution drops into the air -during the operating cycle of the mechanical equipment, the air is brought into the oil in the oil to produce foam. Entering the air is a small amount of air distributed in the entire fuel tank with a small bubble. Entering air and foam treatment is usually a problem of completely separation. It is more serious than the foam, which will cause pump erosion, oxidation, etc., and enter the air different from the air. Usually 8-12%of the dissolved air in oil is contained in industrial Gear Oil, engine lubricating oil, hydraulic oil and guide rail oil, contains different properties of additives. The activity effect is promoted to produce bubbles. In the process of lubricating oil, some glue, asphalt, and mud residue generated by oxidation and decomposition can promote the increase in bubbles. Due to the aging of oils during use, the surface tension of oil products decreases, and it will also promote the production of foam.
3. How to prevent lubricating oil from producing foam Anti-foaming method: Physics -mechanical anti -foam and chemical foam. Antifoam material characteristics: (1) Anti-foaming Agent cannot be dissolved in lubricant; (2) antifoam agents can evenly disperse in lubricating oil; (3) the surface tension of the anti -foaming agent is smaller than lubricating oil. 1) Physics-mechanical anti-bubble (1) Eliminate impurities. Dust and coal powder is the crime of lubricating oil bubbles for the coal milling machine. Not only is the dust itself, but calcium will also adsorb anti -foaming agents. Check whether the filter and respiratory container have particles. Install the filter in a dusty place. The exhaust port is down to avoid dust collection, especially in the case of more dust. Remove or reduce the substance that causes lubricating oil to produce foam. Before installing oil or oil change, the entire lubrication system should be carefully cleaned, especially the residues of the metal cleaning agent used for cleaning should be cleaned. (2) Control the amount of air in the fuel tank. Avoid a large amount of air entering the fuel tank, and the air entered to the fuel tank. The rotation and squeezing of the gears in the system will produce bubbles. If the fuel tank ventilation of poor gears, the bubbles produced by stirring the bubbles cannot be eliminated. On the contrary, if there is pressure in the fuel tank, when the fluid enters the fuel tank, the pressure is released, and the surface of the surface will prevent dissolved air from being released. First of all, eliminating the air source, if it is impossible or too much bubbles, it cannot be released. Try to allow the fluid to flow along the slope. It has enough time to expose to the air. Ensure that the fuel tank is grounded, or expand the area of the fuel tank, or replace it with a synthetic oil. (3) Oil surface is too high or too low. The correct oil level is critical. If the oil level is high, the sports parts will be brought into the air. Low the oil level will bring the air bubble to the liquid surface. The measures that should be taken are regular observation of oil marks, ensuring the oil level, and preventing sharp temperature changes. In the rolling bearings, the general rule is half of the oil level at the bottom of the bottom bead or roller. Too high and easy to foam. (4) The design and maintenance of the fuel tank. Pay attention to the effect of the fuel tank design to fight bubble, and the filter block is a reason for entering the air. If there is no obvious pollution, the bubbles will block the filter, and the demolition of the filter will disappear. Note that the diatom earth filter element can also cause air to enter. The measures should be taken to ensure the correct installation of the filter. Regularly check whether the filter or the respiratory device is damaged, blocked and filtered, and fixed cleaning and replacement. Change the inlet down and reduce the granular entry. Basically, it is to ensure that the foam has enough time to release the surface area to facilitate release. (5) Change of oil temperature. The operation of the environment and equipment is the main reason for the rapid changes in the temperature of lubricating oil. The system can increase the cooling device according to the actual situation to control the oil temperature, preventing the rapid temperature changes in the rapid temperature of the oil. 2) Chemical antifoam -adding anti -foaming agent The tank that shakes stuffed stuffed to see if the foam or enter the air can disappear within half an hour. If it cannot, the sampling depends on whether there are pollution, especially silicon, soap, and cleaning agent. The source of silicon includes excessive anti-foaming agent, silicon sealing and degradation silicon seal, and coated with silicon seal. Granules and grease can form a stable foam. Anti -foaming agents may lose effect when the cleaning agent is existed. Some anti-foaming agents are adsorbed to the exposed metal surface and is separated from oil. Measures should be taken: excluding silicon pollution. Check the possible pollution of grease or sealing, and analyze whether there are cleaning agents pollution. Eliminate the pollution source and then empty, clean, add, and thoroughly wash the joints. To facilitate the installation of parts, you can use silicone or thick oil on the surface without sliding. Check whether the high -voltage pump is inhaled. View the flow of the fuel tank liquid to cause the bubbles to circulate repeatedly or there is no enough time to separate, and handle it accordingly according to the suggestions of this article. Change oil viscosity or use synthetic oil may help. If the problem comes from the consumption of anti -foaming agents, it should be confirmed that there is no other reason. Be careful to add anti-foaming agents. It can be seen from the causes of the above lubricating oil foam that in daily work, you can use adjustment of the fuel tank volume to maintain a reasonable oil level, do a good job of checking the foam air in the foam to eliminate the foam release pressure, strengthen the filtering oil removal oil removal oil Internal impurities improve lubricating oil quality and other measures, combined with chemical anti-foaming methods, adding test volume antifoam agents can effectively avoid and eliminate gearbox lubricating oil foam, and replace lubricating oil.
