Periodic inspection of composite hoses
Steel wire spray pipe is mainly used for conveying mining hydraulic support, oilfield development, engineering construction, lifting and transportation, metallurgical forging, mining equipment, ships, injection molding machinery, agricultural machinery, various machine tools and mechanical and automatic hydraulic systems of various industrial sectors. Petroleum-based (such as mineral oil, solvent oil, hydraulic oil, fuel oil, lubricating oil) and water-based liquids (such as emulsions, oil-water emulsions, water) and liquid delivery pipes with pressure and temperature. Improper use may result in failure of the internal adhesive layer. The following will give you a brief overview of its common faults and how to deal with them.
1. The steel spray pipe glue breaks: Please check the temperature of the hydraulic oil in time. The temperature of the hydraulic oil may exceed the range of the burst pressure of the hose, and adjust and replace the corresponding hose in time.
2. The rubber layer in the steel wire spray pipe is seriously deteriorated and obviously expanded: the reason why the rubber layer in the steel wire spray pipe is seriously deteriorated and obviously expanded is that there is long-term use of oil or oxidative deterioration in the hydraulic system, and the steel wire spray pipe is caused by Deterioration by chemical action, rubber fragments will be found in the oil return. If this happens, check the physical and chemical properties of the hydraulic fluid and check that the compatibility of the rubber material in the system oil and rubber hose and the working temperature meet the standards.
3. The rubber layer in the steel wire spray pipe is hard and cracked: the hose is flexible and plastic due to the addition of plasticizer to the rubber product. The hose operates at high temperatures and pressures. If the hose overheats, the plasticizer will overflow. In addition, when the superheated oil passes through the cylinder, valve or other components in the system, if a large pressure drop occurs, the oil will decompose, causing oxidation and hardening of the rubber layer in the hose.
In this case, check that the operating temperature of the hydraulic system is normal, whether the throttle valve of the valve and the suction passage of the pump are unblocked, etc., and replace the hose after removing all factors that may cause excessive oil temperature and oil decomposition. If only the inner gel of the lower part of the hose rupture is hard and the upper part remains good, this indicates that excessive squeezing, excessive bending or distortion of the hose rupture causes the oil to heat up and accelerate oxidation, which will cause the inner gel to be hard.
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