High-pressure steel wire braided hoseThe service life and pressure bearing capacity are affected by the working environment, and it is necessary to understand the allowable range of temperature and other factors during operation. What are the common problems that may occur when using high-pressure rubber hose assemblies for mining?

The reasons for the failure of the mining high-pressure rubber hose assembly and intermediate joint components are summarized as follows:

1. The pressure source of the hydraulic (emulsion) system adopts a three plunger pump or a five plunger pump, which has high rated pressure, large flow rate, and large pressure pulsation. The components of the pipeline are prone to fatigue damage. Especially for the main supply pipeline, when working under pulse high pressure for a long time, the probability of failure in the thin links of the rubber hose, such as sealing rings, U-shaped clamps, joints, etc., is much higher than the frequency of failure in the high-pressure rubber hose inside the bracket. This is because the latter only experiences high pressure when the bracket is in motion, with a short duration of action and different mechanisms of failure.

2. Emulsified media have low privacy, high density, and relatively poor corrosion resistance, especially in different mining areas where the acidity and alkalinity of water vary greatly. Poor management during use often results in underground emulsions not reaching the required oil-water ratio. Rubber temporarily immersed in this medium will definitely deteriorate, harden, and age.

3. Due to the usage characteristics of underground equipment, the cleanliness of the medium is low, and the medium carries a lot of gas

① On the one hand, cavitation is prone to occur, and when cavitation occurs, the peak pressure can exceed 1GPa;

② On the other hand, high-speed and high flow emulsion carries small impurities and impacts the inner and outer surfaces of the pipeline and joint components, causing grooves and wire drawing erosion.

The damage to the rubber layer inside the high-pressure steel wire braided rubber hose accelerates the corrosion of the steel wire mesh used in the hose and reduces its compressive strength. The pressure wave has a strong impact on the hose assembly and joint components, causing dangerous fracture (breakage) of the hose assembly and joint components.

4. The coal mining production environment has a lot of dust, high humidity, and weakly alkaline water. The friction between the vibrating pipeline and environmental objects causes the rubber on the surface of the hose to wear out, and the anti-corrosion layer on the surface of the joint components to peel off, promoting the damage process.

5. The factories that produce intermediate joint components are mostly small and medium-sized enterprises, which are constrained by technology, equipment, funding, and other conditions. Some even do not process according to the process requirements of the drawings, and the high-pressure hose assembly and pipeline accessories do not meet the technical requirements. The product quality is uneven, with low strength, short service life, and serious pollution, which poses hidden dangers for sudden safety accidents.

6. The design layout is unreasonable. Under normal circumstances, the rubber hose mainly receives internal pressure and bending external forces. The incorrect installation method temporarily puts the rubber hose under additional forces (tension, torsion), reducing the service life of the rubber hose assembly.

7. Failure of pipeline components beyond their service life

Due to the inability to inspect and accurately determine whether rubber hoses and pipeline components have failed or reached their service life, there are a large number of components on site that have exceeded their service life. These high-pressure steel wire braided rubber hoses are often prone to failure during use, leading to an increase in failure rates.