The Working Cycle and Core Characteristics of Hoisting Machinery

The working cycle of hoisting machinery typically includes four stages: lifting, transporting, unloading, and returning, forming a complete work process.

I. Working Cycle Stages

Lifting Stage: The lifting device (such as a hook or grab bucket) lifts the material from the lifting point, completing the initial vertical or horizontal movement.

Transporting Stage: The material is transported to the target location, which may involve horizontal movement or luffing adjustments (such as raising/lowering the boom crane).

Unloading Stage: The material is smoothly lowered to the designated location, ensuring accurate positioning.

Returning Stage: The lifting device returns to its original position unloaded, ready for the next cycle.

II. Core Characteristics

Intermittent Operation: Each mechanism (such as hoisting, traveling, and slewing) is activated as needed, not continuously.

Multi-Mechanism Coordination: Requires coordination with luffing, slewing, and other mechanisms to complete complex movements.

Safety Requirements: Operation must adhere to signal commands, limit protection, and other regulations to avoid overloading or collisions.

III. Typical Applications

Portal cranes: Used for loading and unloading containers, with short and frequent cycle times.