Introduction to the Applications of Hydraulic Support Hoses in Coal Mines

　　 Hydraulic support hoses for coal mines What are its characteristics? Let’s take a brief look together below.

　　1. The hose is made of special synthetic rubber, offering excellent oil resistance, heat resistance, and aging resistance. 2. The hose body is tightly bonded, providing flexibility and minimal deformation under pressure. 3. Hydraulic support hoses for coal mines exhibit outstanding bend resistance and fatigue resistance. 4. These hydraulic support hoses for coal mines feature high pressure‑bearing capacity and superior pulse‑damping performance.

　　What is the purpose of hydraulic support hoses used in coal mines? Let’s take a brief look together.

　　Hydraulic hoses for coal‑mine hydraulic supports are primarily used in underground mining support systems and oilfield extraction. They are also well suited for engineering construction, lifting and transportation, metallurgical forging and pressing, mining equipment, marine applications, injection molding machinery, agricultural machinery, various machine tools, and the mechanized and automated hydraulic systems of diverse industrial sectors—where they convey petroleum‑based fluids (such as mineral oil, soluble oils, hydraulic oil, fuel oil, and lubricating oil) and water‑based fluids (such as emulsions, oil‑water emulsions, and water) under moderate to high pressure and temperature, with a maximum working pressure rating of up to 60 MPa.

　　 Hydraulic support hoses for coal mines What should we keep in mind during use and design? Let’s take a brief look together.

　　1. The bending radius of hydraulic hose assemblies used in coal‑mine hydraulic supports must not be too small; it should generally be no less than the value specified in the “Technical Specifications for Hydraulic Hose Assemblies.” A straight section of hose, with a length of at least twice the outer diameter of the hose, shall be provided at the connection between the hose assembly and the fitting. 2. When determining the length of a hydraulic hose assembly for coal‑mine support systems, account must be taken of the contraction and deformation that occur when pressurized oil is introduced; this contraction typically amounts to 3–4% of the hose’s original length. Therefore, the hose assembly must not be tightened during installation. 3. During installation, hydraulic hose assemblies for coal‑mine supports must not be subjected to twisting. The axis of the rubber hose connection should be positioned as much as possible within the plane of movement to prevent damage to the hose caused by relative motion between its ends. 4. Hydraulic hoses for coal‑mine supports should be kept away from sharp edges and friction on machinery to avoid damaging the tubing.

　　To ensure the safe and reliable operation of hydraulic support hoses in coal mines, what safety measures are in place?

　　1. Pressure: Under normal operating conditions, the hose’s rated working pressure must not be lower than the system’s maximum allowable pressure; for infrequent use, an increase of up to 20% is permissible. For applications involving frequent use and repeated bending or twisting, the allowable pressure should be reduced by 40%. If the system’s surge pressures exceed the hose’s rated working pressure, this will not only shorten the hydraulic hose’s service life but may also lead to equipment damage or personal injury.

　　2. Temperature: Both the fluid temperature and the ambient temperature—whether steady or transient—must not exceed the hose’s temperature‑rating limits. Operating at temperatures outside the hose’s recommended range may degrade its performance, damage the hose, and lead to leaks.

　　3. Fluid Compatibility: The fluid contained in the hose must comply with the “Use” specifications outlined in the product sample; failure to do so may compromise the hose’s service life and safety.

　　4. Appropriate end connections: These are widely used due to their convenient nut‑type joints and low cost. However, in applications subject to significant vibration, nut loosening must be carefully accounted for, and flanged connections should be employed.

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