High pressure hose is an important component in construction machinery such as concrete pumps, excavators, and loaders. However, it is often not taken seriously by people. When leakage, cracks, ruptures, loosening, and other faults occur during use, people do not analyze the cause of the fault but simply replace the hose. Therefore, the same fault will be repeated soon after use. The loosening or rupture of the hydraulic hose wastes oil, pollutes the environment, and affects work efficiency. Even accidents may occur, endangering the safety of people and machines.
Failure analysis of high pressure hose
First, analyze the features of the high pressure pipe. Hoses are divided into rubber hoses and plastic hoses. Plastic pipes are cheap and easy to install. But the load-bearing capacity is poor and easy to age. Therefore, it is only suitable for return pipes or oil drain pipes. Rubber hoses are divided into high-pressure hoses and low-pressure hoses. High pressure flexible hose is generally composed of four parts: outer rubber layer, steel wire reinforcement layer, middle rubber layer, and inner rubber layer. The inner rubber layer is in direct contact with the hydraulic oil and is generally made of synthetic rubber.
The load-bearing capacity of the hose depends on the reinforcement layer. This layer is the skeleton of the hose, usually woven or wound with steel wire. Most medium and high pressure hoses use steel wire braid as the skeleton, while high and ultra-high pressure hoses use steel wire wrapped skeleton. The outer rubber layer is generally made of rubber with good wear resistance and corrosion resistance. This can ensure that the reinforcement layer is not mechanically damaged, chemically corroded, or rusted by moisture. Low-pressure hoses use braided cotton and hemp rope instead of braided steel wire, and are generally used in low-pressure oil return pipelines. Hose failures often refer to outer rubber layer, inner rubber layer, reinforce layer and rupture.