Common faults and precautions of hydraulic hoses for pile-driving boom excavator

In the hydraulic system of pile-driving boom excavators or other heavy industries, it is inseparable from the use of rubber hydraulic hoses, and failures such as seepage, cracks, ruptures, and loosening are not uncommon during use. Let’s analyze it for everyone. .

1. Failure of the outer rubber layer of the hose

1. In areas with low temperature, once the hose surface cracks, the hose will be bent. Pay attention to whether there are cracks in the inner rubber of the hose, and decide whether to replace the hose immediately.

2. The bubbling on the surface of the hose is due to the poor quality of the hose or improper use. If the bubbling occurs in the middle of the hose, it is mostly a hose quality problem. Reliable quality hoses should be replaced in time. If the hose appears at the hose joint, it is likely to be caused by improper installation of the joint.

3. The outer layer of the hose is severely deteriorated and cracks appear on the surface. This is a manifestation of the natural aging of the hose after being used for a long time.

4. The hose is not broken, but a large amount of oil is leaking. At this time, the hose is not found to be broken, but a large amount of oil is leaking. The reason is probably that the inner layer is eroded and scratched when the hose passes through the high pressure, until the steel wire leaks out in a large area The layer causes a lot of oil seepage.

2. The inner layer of the hose is faulty

1. The inner rubber layer of the hose is hard and cracked. The hose works under high temperature and high pressure. Overheating of the hose will cause the hose plasticizer to overflow. When the overheated hydraulic oil passes through the oil cylinders, valves and other components in the system, If a large pressure drop occurs, the hydraulic oil will decompose, causing the inner layer of the hose to oxidize and become hard. In this case, first check whether the working temperature of the hydraulic system is normal, the valve and the orifice, and the suction of the high-pressure pump Whether the channel is unblocked, replace the hose after removing all the factors that may cause the oil temperature to be too high and the hydraulic oil to decompose.

2. The inner layer of the hose is severely deteriorated, and the obvious swelling is due to the overdue use of the hydraulic oil or the presence of oxidized and deteriorated dirt in the hydraulic system. The hose is deteriorated by chemical action, and broken rubber pieces will be found at the oil return port. , Check the compatibility of the rubber material in the hydraulic oil hose of the system and whether the working temperature meets the standard.

3. the fault at the rupture of the hose

1. The hose is broken in one or more places, and the cracks are neat. The main reason for this phenomenon is that the system pressure is too high, which exceeds the pressure resistance of the hose.

2. Torsion occurs at the rupture of the hose. The reason for this phenomenon is that the hose is excessively twisted during installation or use. After the hose is twisted, the structure of the reinforcement layer is changed, and the gap between the braided and wound steel wires increases, which reduces the pressure resistance of the hose, and the hose is easily broken under high pressure.

3. The steel wire curling at the rupture of the hose has obvious necking phenomenon. The reason is that the hose is excessively stretched and deformed, and the layers are separated, which reduces the compressive strength. The hose will shrink or stretch in the length direction under the action of high pressure. Generally, the amount of expansion and contraction is +2%~-4% of the normal state. If the hose is selected too short during installation, it will be greatly stretched during work. In severe cases, it will be broken or loosened. If the span of the hose is too large, the weight of the hose and the weight of the oil will also be affected. It will give the hose a larger tensile force, and in severe cases, it may break or loosen.

Summary: In the installation process, you must first choose a good quality hose. When replacing the hose, install it according to the original tubing length and position. The hydraulic oil should also be replaced in time. The service life is extremely short when working at high temperatures, so the pile-driving boom excavators the high temperature also causes considerable damage to the hydraulic tubing.