How to identify the quality of hydraulic oil for hydraulic wrenches.https://www.biimpact wrench sale

　　The quality of hydraulic oil not only influences the normal operation of Engineering machinery, but also causes serious damage to hydraulic system components. Now combined with work practice, several methods for simply identifying the quality of hydraulic oil without special inspection (inspection and testing) equipment are summarized.

　　1 Identification of hydraulic oil moisture content

　　(1) Visual inspection method: If the oil is milky white and turbid, it means that the oil contains a lot of water.

　　(2) Combustion method: Dip a small amount of oil to be tested (inspected and tested) with clean, dry cotton yarn or tissue paper, and then ignite it with fire. If you find a "crack" popping sound or flashing phenomenon, it means that the oil contains more water.

　　2 Identification of impurity content in hydraulic oil

　　(1) Sensory identification: There are obvious suspended metal particles in the oil, and the presence of fine particles can be directly felt when kneading with your fingers; if there is a reflective flash point under light, it means that the hydraulic components have been severely worn; if A large amount of metal chips deposited on the bottom of the fuel tank indicates that the main oil pump or electric motor and engine have been severely worn.

　　(2) Heating identification: For hydraulic oil with lower viscosity, it can be directly put into a clean and dry test tube to heat up. If precipitation or suspended matter is found in the oil in the test tube, it means that the oil contains mechanical impurities.

　　(3) Filter paper identification: For hydraulic oil with higher viscosity, it can be diluted with pure gasoline and then filtered with clean filter paper. If a large amount of mechanical impurities (metal powder) are found on the filter paper, it means that the hydraulic components have been severely worn.

　　(4) Sound identification: If the entire hydraulic system has large and intermittent noise and vibration, and the main oil pump makes a "buzzing" sound, or even the phenomenon of "crawling" of the piston rod, observe the oil tank liquid level at this time. A large amount of foam will be found at the outlet of the tubing or the transparent level gauge. This condition (Condition) shows that the hydraulic oil has been immersed in a large amount of air.

　　3 Identification of hydraulic oil viscosity changes

　　(1) Glass plate tilting method: Take a clean glass plate, place it horizontally, and place a drop of the tested hydraulic oil on the glass, and at the same time drop another drop of standard hydraulic oil (new hydraulic oil of the same brand) next to it. Then tilt the glass plate and observe carefully: if the flow rate and flow distance of the tested oil are larger than the standard oil, it means that its viscosity is lower than that of the standard oil; otherwise, it means that its viscosity is higher than that of the standard oil.

　　(2) Glass bottle inversion method: Put the tested hydraulic oil and standard oil in two transparent glass bottles of the same size and length (do not fill them too full), and then use the stopper to put the two bottles The mouth is blocked. Place the two bottles side by side, and then quickly turn them upside down at the same time. If the bubbles of the tested hydraulic oil in the bottle rise faster than the bubbles of the standard oil in the bottle, it means that the viscosity of the oil is lower than that of the standard oil, otherwise, it means that the viscosity of the oil is higher than that of the standard oil; If the rising speeds of the bubbles of the two oils are similar, the viscosity is also similar.

　　4 Identification of hydraulic oil quality changes

　　(1) Identification of oil pump oil: Take out a small amount of tested oil from the oil pump. If it is found to be milky white and turbid (sometimes like light yellow milk), and when it is identified by the combustion method, it is found to contain a lot of water. The feel of the hand has lost its stickiness, indicating that the oil has been thoroughly emulsified and deteriorated and should not be used again.

　　(2) Identification of the oil in the fuel tank: Take out a small amount of the tested oil from the fuel tank and filter it with filter paper. If there is a black residue on the filter paper and there is a pungent odor, it means that the oil has been oxidized If it deteriorates, you can also take out part of the precipitation sludge directly from the bottom of the fuel tank. If you find a lot of asphalt and gum deposits in it, put it on your fingers and pinch it (niǎn). If you feel that there is more gum, it has strong adhesion. , It means that the oil has been oxidized and deteriorated. Abstract: Introduced the troubleshooting process of a hydraulic oil staining fault, and formulated measures to prevent the recurrence of this fault. During the lowering of the H3/36B construction tower crane, the third During the operation of the stroke, the hydraulic cylinder suddenly failed to lift, and the piston rod had only a very slight extension action.

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