A Comprehensive Overview of Safety Requirements for the Maintenance and Inspection of Hydraulic Support Hoses in Coal Mines

　　Hydraulic hoses used in coal mines cannot, by themselves, withstand the pressure of the fluid being conveyed; in fact, Hydraulic support hoses for coal mines The design considers only compatibility with the contained fluid, while analyzing the very wide pressure ranges encountered in hydraulic applications. Reinforcing materials provide resistance to internal or external pressures; the three basic types of reinforcement are helical reinforcement, braided reinforcement, and spiral reinforcement. Helical reinforcement typically consists of steel wire (for low‑pressure fabrics) with four to six overlapping layers of reinforcement. Spiral‑reinforced hoses can withstand high pressures and, with longer pulse‑cycle life, are suitable for demanding dynamic applications. Braided reinforcement may be made of steel wire or fabric and can feature one or multiple layers; braided hoses are capable of handling low‑ to high‑pressure pulse applications.

　　For the safety of underground miners, current safety requirements for mining machinery are extremely stringent, particularly… Hydraulic support hoses for coal mines What are the 10 safety requirements for the maintenance and inspection of hydraulic support hoses in coal mines? Let’s take a brief look together.

　　1. During maintenance operations, hang a “Do Not Operate—Under Maintenance” warning sign on the hydraulic support’s control valve. If it is absolutely necessary to operate a specific control mechanism during maintenance, such operation shall be performed by qualified operators under the direction of the maintenance personnel.

　　2. If parts need to be replaced, use genuine manufacturer‑supplied parts or replace them with components that match the specifications and part numbers specified in the manufacturer’s original drawings.

　　3. When servicing the pusher mechanism of a hydraulic support, disconnect the pusher from the conveyor.

　　4. If maintenance work is carried out on the shearer, ensure proper protection of the roof and coal face to prevent rockfalls and rib spalling, and stop both the shearer and the conveyor, or implement other measures, to guarantee that ongoing mining operations will not compromise the safety of the maintenance work. Hydraulic support hoses for coal mines.

　　5. Before performing any maintenance on the hydraulic support, secure it using mechanical locking methods—such as inserting wooden wedges between each pair of four-linkages—and fasten the replacement components to the inclined working face with chains or other effective means, to prevent the roof beam and shield beam from suddenly collapsing and the replacement parts from unexpectedly falling. Upon completion of the work, verify that the repaired components are functioning properly.

　　6. When servicing the support’s hydraulic system, newly replaced rubber hoses must be thoroughly cleaned before installation to ensure that no metal debris or other contaminants remain inside, thereby maintaining the cleanliness of the hydraulic system; otherwise, serious damage could occur.

　　7. Conduct thorough inspections to ensure that there are no leaks at the hydraulic system hose connections and that the hoses show no external damage, exposed reinforcement, or blistering. Hydraulic support hoses for coal mines.

　　8. When repairing or replacing hydraulic hoses, keep in mind that the hydraulic system may contain hoses of different models, specifications, and pressure ratings. Therefore, use rubber hoses of the same model and pressure rating, or a higher‑rated hose of the same model and specification. Do not overlook the installation of O-rings and retaining rings, and ensure that circlips are installed in their correct positions.

　　9. Use only the correct U‑shaped clamp to secure the pipe fitting, and insert it firmly. Never use nails, wire, or any other materials for securing it. Hydraulic support hoses for coal mines.

　　10. Any hydraulic hose older than two years must be replaced, even if it shows no signs of damage. If you suspect that a hydraulic hose is damaged, replace it immediately—never attempt to repair it.

　　The ten safety requirements for maintenance are as follows: adhere to the ten safety requirements for maintenance, operate in accordance with the prescribed procedures, comply with safety operating regulations, eliminate potential hazards, and minimize losses.