Common faults in hydraulic hoses and emergency treatment methods（2）

nner rubber layer failure

1.The rubber layer inside the hose is hard and cracked: 

the plastic is added to the rubber product to make the hose flexible and plastic. The hose works under high temperature and high pressure, and the hose overheats, which will cause plasticizer to overflow. In addition, when the superheated oil passes through the cylinders, valves or other components in the system, if a large pressure drop occurs, the oil will be decomposed, resulting in oxidation and hardening of the rubber layer inside the hose. In this case, first check whether the hydraulic system operating temperature is normal, the throttle of the valve, the suction passage of the pump is smooth, etc., and replace the hose after removing all factors that may cause excessive oil temperature and oil decomposition. If only the inner rubber under the rupture of the hose is hard and the top is kept good, this means that the rupture of the hose is excessively squeezed, bent too fast or twisted, which causes the oil to heat up and accelerate oxidation, which will cause the rubber to harden. .

2. The rubber layer inside the hose is seriously deteriorated and obviously swelled: 

the rubber layer in the hose is seriously deteriorated, and the reason for the obvious swelling is that the hydraulic oil is used in the hydraulic system due to the overdue period of the hydraulic oil or the oxidative deterioration. The hose is chemically affected. Deterioration, broken rubber pieces will be found at the oil return. If this happens, check the physical and chemical indicators of the hydraulic oil, check the compatibility of the system oil and the rubber material and the working temperature to meet the standard.