Management Considerations for Hydraulic Support Hoses in Coal Mines During Maintenance

　　When dismantling, assembling, or replacing components of hydraulic supports in a coal mine working face, care must be taken to prevent roof falls, and appropriate measures must be implemented to ensure the safety of personnel and equipment. Before replacing elements such as pillars, front-beam jacks, and various control valves, the top beam should first be temporarily supported by props.

　　2. Hydraulic components and piping systems on hydraulic supports used in coal mines must not be repaired or replaced under pressure; such work must be performed only after the system has been depressurized. During disassembly, strict precautions must be taken to prevent foreign debris from entering. Hydraulic hoses for coal‑mine hydraulic supports.

　　3. During the dismantling, replacement, and maintenance of hydraulic supports in coal mines, it is essential to use appropriate specialized tools and avoid forceful hammering or rough handling. Particular care must be taken with the piston surfaces of hydraulic cylinders, guide sleeves, valve spools of various instruments, sealing surfaces, fittings, and external threaded connections to prevent damage and avoid creating additional difficulties during maintenance. For the structural components of removed hydraulic parts, clearly mark them and measure their critical dimensions, then place each item in its designated location. Small components such as sealing rings, cotter pins, and other similar parts should be stored in an electrician’s tool kit to prevent loss.

　　4. Various hydraulic components, such as hydraulic cylinders and valves, used in hydraulic supports for coal mines are generally not permitted to be disassembled or reassembled underground. If any defects are detected that render the component unfit for further use, it must be replaced as a complete unit and sent to the surface for repair. During disassembly, assembly, and handling underground, all hydraulic cylinders should first be fully retracted to their lowest position, and the fluid inside the cylinder should be drained to prevent damage to the piston rod surface during transport. Hydraulic hoses for coal‑mine hydraulic supports.

　　5. On coal‑mine hydraulic supports, all plastic hoses, standpipes, hydraulic jacks, and valve bodies must be fitted with appropriate end caps for protection, and care must be taken during storage, handling, and installation to prevent the end caps from becoming dislodged.

　　6. After maintenance and inspection of hydraulic support hoses used in coal mines, comprehensive records should be maintained, including: details of the maintenance activities, consumption of raw materials and spare parts, time required for maintenance, quality‑inspection results, and the technicians involved. This facilitates the accumulation of baseline data and enables in‑depth analysis, thereby optimizing future repair efforts. Following maintenance, the entire support unit should also undergo performance‑characteristic testing. Hydraulic support hoses for coal mines.

　　7. The storage of hydraulic support hoses and the stockpiling of spare parts in coal mines shall be carried out according to a planned scheme, with dedicated personnel assigned to oversee storage and implement measures to prevent contamination, rust, and freezing. Support frames and components should be stored indoors whenever possible. For support frames left outdoors on the ground awaiting repair or temporarily not being sent underground, they must be gathered in designated areas and properly stored; furthermore, all emulsion fluid must be drained from the hydraulic cylinders and valves, and antifreeze should be added where necessary to prevent hydraulic components from cracking due to freezing in winter.

　　8. During storage, the plastic hoses used in coal‑mine hydraulic supports shall be coiled or neatly tied; the minimum bending radius of the coil shall not be less than 200–500 mm. Rubber products and nylon components must be protected from direct sunlight and exposure to rain or snow. The ambient temperature should be maintained between –15°C and +40°C, and the relative humidity should be kept within 50%–80%. Contact with acidic or alkaline oils, solvents, and other organic substances is strictly prohibited, and these items must be kept at least 1 meter away from hot equipment.