A chain is a flexible transmission component formed by connecting multiple links through pins, bushings, and other components. It is primarily used to transmit mechanical power, convey materials, or pull objects, finding widespread application in industrial production, transportation, agricultural machinery, and other fields.

Based on structure and application, chains are primarily categorized into three types: transmission chains, conveying chains, and lifting chains:

Transmission Chains: Primarily designed for power transmission, common types include roller chains and sprocket chains. They adapt to power outputs from motors, reducers, internal combustion engines, and similar equipment, offering high transmission efficiency and stable load-bearing capacity.

Conveyor chains: Primarily designed for material handling, these chains can be fitted with attachments like scrapers, buckets, or deflectors. They are used in assembly lines, mining operations, food processing, and other scenarios to enable continuous, automated material transport.

Lifting chains: Engineered for heavy-duty traction, these chains are made from high-strength alloy steel. They offer excellent tensile strength and wear resistance, making them suitable for hoisting and moving heavy loads in cranes, lifts, and similar equipment.

Chains are typically made of carbon steel, stainless steel, or alloy steel. Heat treatment processes like quenching and carburizing enhance hardness and wear resistance. Galvanizing, blackening, or coating treatments are applied in certain scenarios to improve rust and corrosion resistance. Their advantages include compact structure, precise transmission ratios, and adaptability to harsh conditions (high temperatures, dust, humidity), making them core components in industrial transmission and conveying systems.