English
English
1. Failure of the outer rubber layer: (1) Cracks on the surface of the hose The main reason for the cracks on the surface of the hose is that the hose is bent in a cold environment.(2) Blistering on the outer surface of the hose The reason for the bubbling on the outer surface of the hose is that the production quality of the hose is not up to standard, or it is used improperly during work.(3) The hose is not broken but there is a lot of oil leakage. The hose leaks a lot of oil but no rupture is found. oil seepage.(4) The outer rubber layer of the hose has deteriorated severely, and microcracks appear on the surface, which is a manifestation of the natural aging of the hose.Due to aging and deterioration, the outer layer is continuously oxidized so that the surface is covered with a layer of ozone, which thickens as time goes on. As long as the hose is slightly bent during use, tiny cracks will occur.In this case, the hose should be replaced.2. Failure of the inner rubber layer: (1) The inner rubber layer of the hose is hard and has cracks: the main reason is that the plasticizer is added to the rubber product to make the hose flexible and plastic.However, if the hose is too hot, the plasticizer will overflow.(2) The inner rubber layer of the hose is seriously deteriorated and obviously swollen: the inner rubber layer of the hose is seriously deteriorated, and the reason for the obvious swelling is that the inner rubber material of the hose is incompatible with the oil used in the hydraulic system, and the hose is deteriorated by chemical action .3. Faults manifested in the reinforcement layer: (1) The hose is broken, and the braided steel wire near the break is rusted. The hose is broken, and the outer rubber layer is peeled off for inspection.This is mainly due to the fact that this layer is affected by damp or corrosive substances, which weakens the strength of the hose and causes it to rupture under high pressure.(2) The reinforcement layer of the hose is not rusted, but there are irregular broken wires in the reinforcement layer.The hose was broken, and the reinforcement layer was not found to be rusted after peeling off the outer rubber layer, but irregular broken wires appeared in the length direction of the reinforcement layer. The main reason was that the hose was subjected to high-frequency impact force.4. Faults manifested at the rupture: (1) The hose is ruptured in one or more places, the cracks are neat, and other parts are in good condition.The main reason for this phenomenon is that the system pressure is too high, which exceeds the pressure resistance of the hose.(2) Torsion at the rupture of the hose The reason for this phenomenon is that the hose is excessively twisted during installation or use.5. In summary, through the above analysis, the following items should be paid attention to when using hydraulic hoses in the future: (1) The hose layout should try to avoid heat sources and keep away from the performance of the engine exhaust pipe.If necessary, devices such as sleeves or protective screens can be used to prevent the hose from deteriorating due to heat.(2) Where the hose must cross or where friction may occur with the mechanical surface during work, protective devices such as hose clips or springs should be used to prevent the outer layer of the hose from being damaged.(3) When the hose must be bent, the bending radius should not be too small, and should be greater than 9 times the outer diameter.There should be a straight section at the connection between the rubber hose and the joint that is twice the outer diameter of the hose.(4) When installing the hose, avoid tension. Even if there is no relative movement at both ends of the hose, keep the hose loose. The tensioned hose will expand under pressure and reduce its strength.(5) Do not twist the hose during installation.Slight twisting of the hose can reduce its strength and loosen the fittings, which should be assembled with the fittings tightened to the hose, not the hose to the fittings.(6) If the hose is arranged on a key component, it is recommended to check or replace it regularly.
