An introduction to the connection methods for hydraulic support hoses used in coal mines—save this now!

Release date:

2022-07-21

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Hydraulic hoses for coal‑mine hydraulic supports are also known as hydraulic hoses, high‑pressure hoses, hydraulic tubing, steel‑wire reinforced high‑pressure hoses, wire‑braided hoses, or wire‑wrapped hoses. They are generally classified into wire‑braided hydraulic hoses and wire‑wrapped hydraulic hoses. A hydraulic hose typically consists of an inner rubber layer that resists the conveyed fluid, a middle rubber layer, two, four, or six layers of steel‑wire reinforcement, and an outer rubber layer. The inner rubber layer withstands the pressure of the working medium and protects the steel wires from corrosion, while the outer rubber layer shields the wires from damage. The steel‑wire layers serve as the structural framework, providing strength and reinforcement.

　　 Hydraulic support hoses for coal mines Also known as hydraulic hoses, high-pressure hoses, hydraulic tubing, steel‑wire reinforced high-pressure hoses, wire‑braided hoses, or wire‑wrapped hoses, these products are generally categorized into wire‑braided hydraulic hoses and wire‑wrapped hydraulic hoses. A hydraulic hose typically consists of an inner rubber layer resistant to the conveyed fluid, a middle rubber layer, two, four, or six layers of wire reinforcement, and an outer rubber layer. The inner rubber layer withstands the pressure of the working medium and protects the steel wires from corrosion, while the outer rubber layer safeguards the wires from mechanical damage. The wire reinforcement serves as the structural backbone, providing strength and durability.

　　What is the connection method for hydraulic support hoses used in coal mines? Let’s take a brief look together. When matching hydraulic support hose fittings with other equipment, ensuring a reliable seal between the hydraulic hose and the rubber hose is a critical step. Let’s examine this in more detail.

　　1. The internal and external threads of quick-connect fittings must be connected to hoses via adapter or transition fittings.

　　2. Regardless of the variety of hose fittings, select the appropriate transition fitting based on the type of fitting. If the hose is a standard water hose, use a transition fitting with an internal thread on one end and a hose connection on the other, then secure it with a hose clamp. If both ends of the hose have internal threads, connect them using a transition fitting that features one internal thread and one external thread. If both ends of the hose have external threads, use a transition fitting to join them to components with internal threads.

　　3. In general, hydraulic quick‑connect couplings are designed to withstand high pressures. Consequently, high‑pressure hoses are typically used, with internal threads at both ends; therefore, they can usually be connected directly.

　　4. As for the hydraulic fitting, it achieves a seal without the use of additional O-rings; moreover, the product features a female end on one side and a male end on the other, ensuring a completely tight seal when connected.

　　Use Hydraulic support hoses for coal mines What are the precautions to take at this time? Let’s take a quick look together below.

　　1. When routing hoses, avoid exposure to heat sources and keep them well clear of engine exhaust pipes; where necessary, use protective sleeves or shields to prevent thermal degradation. 2. During operation, if the hose must cross or rub against machine surfaces, employ hose clamps, springs, or other protective devices to safeguard the outer layer from damage. 3. When bending a hose, ensure the bend radius is not too small—always maintain a radius greater than nine times the hose’s outer diameter—and provide a straight‑section at least twice the hose’s outer diameter at the connection between the hose and the fitting. 4. Hose assemblies should be kept under tension. Even when there is no relative motion between the hose ends, the hose should remain taut; a slack hose will expand under pressure, reducing its strength. 5. Do not twist the hose while the equipment is in operation. Even slight deformation can weaken the fitting and cause it to loosen; during installation, secure the fitting onto the hose rather than tightening it directly onto the hose itself. 6. If a hose is installed on critical components, it is recommended to perform regular inspections or replace it as needed.

Keywords:

Introduction to the Applications of Hydraulic Support Hoses in Coal Mines

A manufacturer of high-pressure hose assemblies explains how to prevent leaks in high-pressure hose components.