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Cooling & Dust Suppression

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Founded in 1998, Shaanxi Heli Mechanical Engineering Co., Ltd is a local private enterprise in Xi'an City, Shaanxi Province, China. We study and analyze the world's advanced mining equipment, and then transforms it in combination with the current situation of material technology in China, so as to improve production efficiency and save economic cost. After years of trials and hardships, it has formed a modern mechanical equipment manufacturing company integrating mechanical design, manufacturing and assembly.

Longwall Shearer Ranging Arm Spray Block

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Longwall Shearer Water Jacket

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Why Choose Us

Company Honor

We are a certified industrial enterprise research and development institution, innovative enterprise, technology-based enterprise, and high-tech enterprise.

Global Market Coverage

Our products are widely used in underground coal mining areas in Central Asia, South Asia, and various industrial markets around the world.

High-Precision Manufacturing Equipment

Our company is equipped with a variety of high-precision machining equipment, including CNC lathes, rotary lathes, horizontal milling and boring machines, vertical machining centers, and coordinate measuring machines (CMM).

Professional After-Sales Service

We offer comprehensive after-sales support, including return and exchange processing, maintenance and repair, technical support, complaint handling, and standard warranty services. This ensures that our customers enjoy worry-free operation, high-quality products, and reliable support throughout the product lifecycle.

Advantages of Longwall Shearer Ranging Arm Spray Block

Cooling of Cutting Bits

Water sprays from the spray blocks cool the tungsten-carbide picks (bits). This constant cooling significantly extends the life of the picks, reducing downtime for replacements and reducing operational costs.
Improved Cutting Performance

Using water-jet-assisted cutting through spray blocks can improve cutting efficiency. The high-pressure streams help cut the coal more efficiently, allowing for increased production rates.
Reduced Risk of Methane Ignition

The water spray helps dissipate heat generated at the tip of the pick, significantly lowering the risk of methane ignition, a major safety concern in underground mining.
Improved Visibility and Cleaner Environment

By trapping dust at the source, the spray blocks maintain better visibility on the longwall face, enhancing operator safety and aiding automated operations.

Technical Specifications

Parameter	Specification	Description
Spray Pressure	0.3–0.6 MPa	Optimal operating pressure for effective dust suppression and cooling.
Flow Rate	10–25 L/min	Adjustable flow to match varying working face conditions.
Spray Angle	45°–90°	Wide-angle coverage for full dust suppression along the ranging arm.
Coverage Range	2–6 m	Effective reach from the spray block to surrounding coal surfaces.
Material	Stainless Steel / Wear-Resistant Alloy	Corrosion-resistant and durable for harsh underground conditions.
Mounting Dimensions	Length: 500–800 mm, Width: 150–250 mm	Designed to fit standard ranging arm sizes; compact and easy to install.
Swing Range	±30°–45°	Allows full motion of the ranging arm without spray obstruction.
Compatible Shearer Models	All major longwall shearers (e.g., Joy, Eickhoff, Caterpillar)	Ensures versatility across different equipment brands and types.

Structures Of Longwall Shearer Ranging Arm Spray Block

Spray Manifolds/Modules: These are typically steel modules (manifolds) mounted on the ranging arm. They are designed to withstand high pressure and harsh cutting conditions.

Nozzles: Multiple nozzles are embedded within the modules to generate a fine mist. This mist serves to capture the dust generated by the rotating drum.

Water Supply Lines

Internally routed or externally mounted hoses supply high-pressure water to the modules.

Mounting Brackets

Specialized brackets secure the manifolds to the ranging arm; these are typically positioned near the drum and aligned along the length of the arm.

Integrated Water Flushing

Many modern ranging arms feature integrated water channels dedicated to nozzle flushing and lubrication.

Working principle of Longwall Shearer Ranging Arm Spray Block

Fluid Transmission

The spray block acts as a sealing and distributing unit that receives high-pressure water from the main shearer body and transmits it through the rotating ranging arm to the cutting drum.

Dust Suppression & Cooling

The system, often operating at pressures between 70 and 150 bar, emits water sprays directly onto the cutting picks (2-4 L/min per pick).

Rotational Integrity

The spray block must maintain a watertight seal even while the ranging arm is being raised or lowered by hydraulic rams, and while the drum is rotating at 30-50 RPM.

Internal and External Sprays

The block typically supports internal water jetting (through the pick body) and external sprays on the drum, which are both essential for comprehensive dust control on high-capacity longwall faces.

FAQ

Q: What materials are used in the spray block?

A: Most spray blocks are made from stainless steel or wear-resistant alloys. These materials provide excellent corrosion resistance, high durability, and long service life in harsh underground mining environments.

Q: Can the spray pressure and flow rate be adjusted?

A: Yes, the system typically allows adjustable spray pressure (0.3–0.6 MPa) and flow rate (10–25 L/min) depending on the working conditions. This flexibility ensures optimal dust suppression efficiency.

Q: How often does the spray block need maintenance?

A: Maintenance frequency depends on operating conditions, but regular inspection is recommended. Cleaning nozzles and checking for blockages every maintenance cycle helps ensure consistent spray performance and extends service life.

Q: How does the spray block work on a shearer ranging arm?

A: The spray block is mounted on the ranging arm of the shearer and connected to a water supply system. When activated, it releases high-pressure mist or water spray at a controlled angle, covering the cutting area to suppress dust and reduce airborne particles during coal cutting operations.

Shaanxi Heli Mechanical Engineering Co., Ltd. is one of the most reliable cooling & dust suppression manufacturers and suppliers in China. With abundant experience, we warmly welcome you to buy high quality cooling & dust suppression in stock here from our factory. We also accept customized orders.