The Role Of Steel Wire in Rubber Hose

Reinforced rubber hose is a flexible conduit used to transport liquid, gas and granular or powdery solid materials, and transmit hydraulic and pneumatic power. Whether it is conveying materials or transmitting power, the hose must bear various internal or external pressures (positive or negative pressure). Therefore, the main function of the steel wire reinforcement layer is to strengthen the rubber hose so that it has the ability to withstand positive and negative pressure. During the use of rubber hoses, especially hydraulic hoses, the pressure on them is not constant. It has to withstand the periodic pulse pressure from 0 pressure to 125% of the working pressure, and sometimes even higher instantaneous impact pressure. In the design of the rubber hose, it is necessary to add a safety factor to the required working pressure, that is, the ratio of the minimum burst pressure to the maximum working pressure. The factor of safety varies from 2 to 5, and is generally 4. Rubber hoses, especially hydraulic hoses, not only have to bear the periodic changes of internal diameter increase, shrinkage and length elongation and shortening due to pressure during work, but also have to withstand periodic bending caused by bending deformation installation. scratch change. In addition, there are also degradation effects on the inner rubber layer and outer rubber layer by the conveyed materials and the medium for transmitting power, climate and environment, high temperature and low temperature. All these factors not only directly affect the performance of the rubber hose, but also affect the service life of the hose. In the design of rubber hose, the main considerations for steel wire are tensile strength, toughness (flexibility) and specifications, and the appropriate steel wire is selected according to the pressure level of the hose. Generally speaking, the lower the tensile strength of the steel wire, the better the flexibility, and the higher the tensile strength, especially at its upper limit, the worse the flexibility and the greater the brittleness. However, it is more important to develop steel wires with high strength and good flexibility at the same time, which will play an important role in improving the performance and service life of rubber hoses. The bonding of steel wire and rubber is very important to the flex resistance and pulse performance of rubber hoses, especially hydraulic hoses. After the rubber hose is molded and vulcanized, the components of the tube body are well bonded, making the tube body an inseparable whole. This is one of the issues that must be considered in hose design.