The method of determining the oil change period is more scientific and reasonable. According to the hydraulic oil change index, it is decided according to the test list whether to change the oil. The oil change index is formulated according to different oil types, and can be solved after long-term and extensive test evaluation. .
Take the SH/T 0476-92 L-HL (SH/T 0476-92 (2003) L-HL) hydraulic oil change index as an example in China, see the following table:
Appearance: opaque, turbid (test method: visual inspection)
Chromaticity change (than new oil) / No.: greater than or equal to 3 (test method: GB/T 6540)
Acid value / mgKOH.g-1: greater than 0.3 (test method: GB/T 264)
Moisture (%): 0.1 (test method: GB/T 260)
Mechanical impurities (%): 0.1 (test method: GB/T 511)
Copper corrosion (100 ° C, 3 h) / grade: greater than or equal to 2 (test method: GB/T 5096)
This standard applies to the lubrication of hydraulic fluids in the headstock, hydraulic and gearboxes of general machine tools or similar mechanical equipment. In the absence of laboratory conditions, the recommended oil change period for L-HL oil is 2500-4000 working hours.
Please note that this is the oil change indicator for hydraulic oil, not the finished product standard. It is very normal to introduce moisture and mechanical impurities during use. The standard of L-HL first grade in GB11118.1-94 is as follows: moisture and mechanical impurities are not.
Although China's national standards for hydraulic oil are also compiled with reference to some foreign OEM standards and national standards, if imported hydraulic parts are used, it is recommended to refer to foreign standards in the course of use.
In addition, if it is in the environment where the oil requirements are very strict, the above indicators may not meet the requirements for use. For example, if the mechanical impurities are greater than 0.1%, the oil change may cause problems under certain circumstances, and the ISO and the hydraulic cleanliness should be Industry standards are set, for example 20/18/15. When conditions permit, you can consider using the oil filter online oil filtration to ensure the quality of the oil.
Tape measure is a commonly used tool in daily life, and it is one of the necessary tools for the family. Luban ruler, Feng Shui ruler, and Wen Gong ruler are also Steel tape measures. Steel tape measure is a common tool for construction and decoration.
Steel tapes can be divided into self-rolling tapes, braking tapes, and rolling tapes. Other names of steel tape measure are: steel tape measure, steel box ruler.
Rubber Tape Measure,30M Metal Tape Measure,Rubber Measuring Tape,Best Steel Tape Measure
Yucheng tengxu Measuring Tool Co., Ltd , https://www.txhardwaretools.com