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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 Copper Bushing

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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 Copper Bushing

Superior Load Handling

Copper bushings, often using high-strength copper alloys, handle the massive loads and high torque generated by modern, powerful ranging arms, which can handle 1,200 kW, without premature failure.

Reduced Wear and Maintenance

The self-lubricating or specialized wear-resistant properties of bronze/copper alloys provide a longer service life, reducing the need for frequent, difficult in-situ maintenance of the shearer.

Increased Equipment Availability

By improving the reliability of the ranging arm—a critical component—these bushings contribute to higher uptime for the entire longwall face, ensuring more continuous coal production.

Optimal Performance in Tough Conditions

They ensure the reliable, precise positioning of the cutting drum, allowing the shearer to efficiently cut and load coal in challenging underground environments.

Technical Specifications

Parameter	Specification Range	Description
Inner Diameter (ID)	50 mm – 400 mm	Precision-machined inner diameter for perfect shaft fit in shearer ranging arm assemblies
Outer Diameter (OD)	80 mm – 500 mm	Designed to match different housing sizes in longwall shearer gearboxes and arms
Length / Thickness	30 mm – 300 mm	Customizable length to support different load-bearing and installation requirements
Material	Tin Bronze / Aluminum Bronze / CuSn12 / CuAl10Ni	High-strength copper alloy with excellent wear resistance and load capacity
Load Capacity	≤ 120 MPa (dynamic load)	Suitable for heavy-duty mining environments with high impact and continuous operation
Operating Temperature	-20°C to 300°C	Stable performance under high-temperature underground mining conditions
Friction Coefficient	0.08 – 0.15 (with lubrication)	Low friction design to reduce wear and extend service life
Lubrication Type	Oil / Grease lubrication	Supports continuous lubrication systems in shearer ranging arms
Hardness	HB 80 – 220	Optimized hardness for balance between wear resistance and toughness
Application	Longwall Shearer Ranging Arm System	Used in coal mining shearer cutting arm, gearbox, and rotating support joints

Structures Of Longwall Shearer Ranging Arm Copper Bushing

Material Composition

Typically manufactured from high-strength phosphorus bronze, aluminum bronze, or lead bronze alloys to provide a balance of hardness, wear resistance, and lubricating properties.
Design Configuration

Often designed as solid, thick-walled cylindrical bushings or sleeve bearings to handle high load pressure at the ranging arm hinge.
Lubrication Features

Often include internal oil grooves or channels to ensure continuous lubrication distribution, reducing friction and preventing excessive heat buildup during operation.
Precision Machining

The inner diameter is machined to precise tolerances to fit the pivot shaft, while the outer diameter ensures a secure interference fit with the ranging arm bore.

Working principle of Longwall Shearer Ranging Arm Copper Bushing

Low-Friction Bearing Interface: The bushing acts as a sleeve between the stationary and moving parts of the ranging arm pivot (e.g., between the hinge pin and the arm housing).

Self-Lubrication/Reduced Friction: Copper alloys (often bronze) are used because they are softer than steel, acting as a lubricant interface to reduce heat and prevent the seizing of steel-on-steel components.

Load Distribution

It distributes the high radial loads caused by coal cutting forces and hydraulic cylinder lifting forces evenly across the pivot pin.

Sacrificial Wear Part

The bushing is intentionally designed to wear out before the more expensive, critical structural components like the ranging arm housing or the hinge pin, allowing for easier and cheaper maintenance.

Lubrication Retention

Many bushes have specially designed internal grooves that distribute grease or oil through the pivot joint, ensuring smooth movement during vertical positioning of the drum.

FAQ

Q: What material is used for your shearer copper bushings?

A: We mainly use high-strength copper alloys such as tin bronze (CuSn12) and aluminum bronze (CuAl10Ni). These materials offer excellent wear resistance, impact strength, and long service life in harsh underground mining environments.

Q: Can the bushings be customized according to drawings?

A: Yes. We provide full OEM/ODM customization services, including inner diameter, outer diameter, length, material grade, and lubrication grooves based on your technical drawings or machine requirements.

Q: Which shearer models are compatible with your bushings?

A: Our bushings are compatible with major longwall shearer brands such as Eickhoff, Joy, Sandvik, and MG series. Custom sizes are also available for non-standard equipment.

Q: How long is the service life of a copper bushing in mining conditions?

A: Under proper lubrication and normal working conditions, the service life can vary from 6 months to 2 years, depending on load intensity, environment, and maintenance frequency.

Q: Do your bushings support high-load underground mining operations?

A: Yes. Our copper bushings are designed for high dynamic loads up to 120 MPa, making them suitable for heavy-duty longwall mining operations with continuous impact and vibration.

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