The pathogenic factors of the hydraulic system of the automatic mixer: pollution, overheating, and entering air. There is a close relationship among the three major adverse factors, and the occurrence of any one adverse factor will lead to the emergence of another or more problems. The results show that 95% of the "pathogenic" factors in the hydraulic system are caused by these three adverse factors.
If there is no problem with the manufacture of hydraulic parts, the damage is generally caused by improper maintenance, and the reasons for improper operation are generally less. Lack of understanding of the working environment of the mixer truck is the main reason. If you know some common sense principles and understand the three adverse factors that cause faults, you can ensure good long-term working conditions.
The working oil of the mixer truck enters the foreign matters in the deteriorated oil, and the sources include ash, sand, soil, etc
The outside of hydraulic components is not cleaned, impurities are not removed, and the feed is brought into the system, or the sealing ring is damaged and enters the system; The interior is not clean, and a small amount of impurities are easily left in the oil tank or parts; Feed containers and appliances shall be clean; Improper oil storage, unclean or deteriorated before adding oil; Deteriorated oil can damage parts. Metal molecules are broken and suspended in oil. The foreign matters may damage and corrode the workpiece, especially for the finished workpiece. The foreign matters may damage the inner wall, oil seal ring and filler of the leather pipe, resulting in the failure of the hydraulic system.
The overheating of the hydraulic system may be caused by one or more of the following reasons: when air or water enters the oil and the hydraulic pump converts the oil into pressure, the air and water will overheat due to the increase of heat; The oil level in the hydraulic system is too high, and the oil agitates strongly, causing overheating; Oil with poor quality may become thin, causing foreign substances to float or have affinity with water, which may also cause overheating; Working overload will also generate heat; Improper adjustment of oil return valve or failure to replace damaged parts in time will also generate heat.
When air enters the oil, in addition to causing overheating, if about 20% of the compressed volume belongs to dissolved air, foam will be formed when the pressure drops. When the working hydraulic cylinder depressurizes and returns oil, the oil with foam will form a "sponge" property. In addition, the oil contains a lot of foam, which will increase the total volume and cause the oil tank or oil reservoir to overflow.
The working oil containing air will produce jerky spasm when transmitting power. The working oil containing air will also cause the risk of cavitation of the hydraulic pump, resulting in greater suction, which will suck more air and other impurities into the system. The oil will overheat due to the air entering the oil, and the air will also bring in dust at the same time, which will quickly deteriorate the oil.
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