High Frequency Quenched Drum for Industrial Lifting

Product Overview
The drum group is a critical component of the crane hoisting mechanism, typically consisting of the drum, drum shaft, gear coupling (or large gear), drum hub, bearing housing, and bearings. When a rotary-type upper-limit switch is mounted on one end of the drum shaft, it is essential that the shaft rotates synchronously with the limit switch spindle to ensure proper hoisting limit protection.

Core Materials and Process Advantages
Drum manufacturing employs three main material options, each suited to different application requirements:

• Gray cast iron (Grade HT20-40, minimum HT200) – cost-effective and requires aging treatment to relieve internal stresses.

• Cast steel (Grades ZG25, ZG35, equivalent to ZG270-500) – offers high strength and must undergo annealing treatment.

• Welded steel plate (Grades Q235B, Q345B) – ideal for heavy-duty applications, providing superior structural strength to meet high-performance crane demands.

Services and Commitment

• Non-standard customization – engineering drawings available based on your specifications for drum diameter, length, wall thickness, rope groove dimensions, and bearing types.

• Ready-to-install assemblies – each drum group is delivered fully assembled with drum, shaft, gear coupling, hub, bearing housing, and bearings for direct installation upon arrival.

• After-sales support – including installation guidance, routine maintenance recommendations, and troubleshooting assistance for any drum group abnormalities.

Product Categories

Classification by Manufacturing Method
According to the manufacturing process, drums are categorized as cast drums and welded drums:

• Cast drums – made from HT200 gray cast iron or ZG270-500 cast steel; they are cost-effective and well-suited for standard operating conditions.

• Welded drums – fabricated from Q235B or Q345B steel plates; they are designed for heavy-duty cranes with high-performance requirements. It is worth noting that large cast iron drums are increasingly difficult to manufacture, and welded steel plate drums have become the prevailing choice in international markets.

Classification by Rope Winding Layer
Based on the number of rope winding layers, drums are classified as single-layer winding drums and multi-layer winding drums:

• Single-layer winding drums – used in conventional hoisting mechanisms, ensuring neat and orderly rope arrangement.

• Multi-layer winding drums – designed for applications requiring high lifting heights, effectively reducing the overall drum size while accommodating longer rope lengths.

Get Started Now – Simply provide your crane model, rated hoisting capacity, and required lifting height, and we will promptly prepare a tailored drum group selection proposal and quotation. Welcome to inquire!