Short Product Introduction

This hydraulic hose assembly is specially designed for underground coal mine hydraulic supports. Built with an emulsion- and oil-resistant inner tube and high-strength steel wire reinforcement, it covers a working pressure range from 0.8 MPa to 42 MPa and withstands temperatures from -40°C to +120°C. The hose assembly reliably delivers emulsion and hydraulic oil, offering excellent pulse resistance, aging resistance, corrosion resistance, and extended service life. It serves as the core pipeline component ensuring safe and efficient operation of hydraulic support systems.

Detailed Product Description

Hydraulic Hose Assembly for Coal Mine Hydraulic Supports — A Reliable Barrier for Deep-Mine High-Pressure Operations

This high-performance hose assembly is specially designed and manufactured for hydraulic support systems on fully mechanized longwall faces in underground coal mines. Strictly developed in accordance with the demanding operating conditions of the coal industry, it is used in critical hydraulic circuits such as power transmission, leg raising and lowering, and pushing and pulling the conveyor and supports. The product can smoothly convey both emulsions (the water-based transmission medium prepared with emulsified oil) and mineral hydraulic oils, delivering consistent, safe, and durable performance in underground environments characterized by moisture, heavy dust, high loads, and potential methane hazards.

Excellent Media Compatibility and Temperature Performance
The inner tube is formulated with a high-performance synthetic rubber compound that provides superior chemical inertness and swelling resistance in contact with the common emulsions used in coal mines (typically 1%–5% oil-in-water emulsions) and various hydraulic oils. Long-term exposure causes no leaching, cracking, or softening, effectively preventing inner wall damage and contamination caused by media attack. The product operates within an ambient temperature range of -40°C to +120°C. It can withstand the cold start conditions of surface equipment in severe northern winter mining areas and endure the heat in high-temperature zones of return airways or radiant heat from adjacent equipment near the supports. The hose maintains good flexibility and structural integrity under temperature fluctuations.

Wide High-Pressure Gradient for All Support Movements
The pressure design is scientifically engineered, with the full series covering a broad working pressure range from 0.8 MPa to 42 MPa. This span covers every operating condition from low-pressure return lines and dust suppression spray to high-pressure leg lifting and shock-bump protection. The hose body employs a multi-layer steel wire braided or spiraled reinforcement structure, optimized mechanically to combine ultra-high burst resistance, outstanding pulse fatigue resistance, and high capacity to absorb instantaneous pressure fluctuations. Under conditions of frequent directional shifts, rapid support advancement, and roof weighting that cause severe pressure oscillations, the hose does not bulge, delaminate, or burst. Its stable and lasting pressure-bearing performance ensures precise transmission of support setting force and eliminates safety accidents caused by high-pressure line failures.

Reliable Structure and Precision Crimping Technology
The hose consists of an oil- and emulsion-resistant inner tube, multiple layers of high-tensile steel wire reinforcement, and an aging- and weather-resistant outer cover. The outer cover is specially enhanced with abrasion-resistant, antistatic, and flame-retardant properties in compliance with underground coal mine safety regulations for non-metallic piping materials. These features effectively reduce the risk of ignition and flame spread when subjected to friction, scraping, or accidental underground fire sources. The assembly is integrally crimped using industrial-grade CNC crimping equipment, ensuring precise matching of the hose body with high-quality carbon steel or alloy steel couplings. The crimping dimensions are stable, and the bite is tight and gapless, eliminating the common problems of coupling pull-off and leakage found in mining hydraulic circuits. The coupling surfaces receive anti-rust and anti-corrosion treatments such as zinc plating, phosphating, or blackening. Standardized interfaces seamlessly connect to hydraulic support directional control valves, pilot-operated check valves, leg cylinders, and rams. Installation and removal are easy and fast, significantly reducing the time required for face relocation and maintenance.

Durable Reliability Tailored for Underground Conditions
Before leaving the factory, each hose assembly undergoes a stringent series of multi-dimensional quality inspections, including ultra-high-pressure burst tests, high-temperature aging tests, emulsion immersion compatibility tests, pulsating cycle endurance tests, and airtightness tests, ensuring a high safety margin and uniform performance. The product features excellent dynamic flex fatigue resistance and the ability to withstand lateral crushing, adapting to the harsh conditions of frequent bending, dragging, and friction during support movement. The highly abrasion-resistant outer cover greatly reduces the failure risk caused by wear when the hose is routed in complex spaces near the scraper conveyor path or in the vibration zone of the shearer.

Through material modification and process upgrades, this hose assembly provides a significantly longer effective service life than ordinary hydraulic hoses, reducing unplanned downtime and replacement frequency and lowering spare parts inventory and labor maintenance costs. It has become the core choice for hydraulic support system matching and pipeline replacement at numerous mechanized coal mining faces nationwide, forming a solid high-pressure fluid transmission defense line for high-yield, high-efficiency longwall mining, roof safety management, and personnel protection.