Common faults and causes analysis of hydraulic hoses
Hydraulic hose is an important part of construction machinery such as concrete pump, excavator, loader, etc. However, it is often not taken seriously by people. The cause of the failure and simply replacing the hose, repeats the same failure shortly after use. The loosening or rupture of hydraulic hoses not only wastes oil, pollutes the environment, but also affects work efficiency, and even causes accidents and endangers human and machine safety.
Reasons for failure analysis of hydraulic hoses: improper use, unreasonable system design and unqualified hose manufacturing.
The following will combine my experience in actual work to make a detailed discussion on it.
First, the characteristics of the pipe are analyzed. Hose is divided into rubber tube and plastic tube. Plastic tube is cheap and easy to install, but has poor bearing capacity and is easy to age. It is only suitable for oil return pipe or oil drain pipe; rubber tube is divided into high-pressure hose and low-pressure hose. It consists 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 made of synthetic rubber. The load-carrying capacity of the hose depends on the reinforcement layer, which is the skeleton of the hose and is usually braided or wound with steel wire. Most of the medium and high pressure use steel wire braid as the skeleton, and the high pressure and ultra-high pressure mostly use steel wire winding skeleton. The outer rubber layer is generally made of rubber with good wear resistance and corrosion resistance to ensure that the reinforcement layer is not damaged by mechanical damage, chemical corrosion, moisture and rust. The low-pressure hose is made of braided cotton and twine instead of braided steel wire, which is generally used for low-pressure oil return. pipeline.
