Eds Double Girder Electric Hoist(main And Auxiliary Hooks)

EDS Double girder electric hoists equipped with main and auxiliary hooks are designed for versatile heavy-duty lifting, balancing high-capacity handling with operational efficiency.  Below is a detailed breakdown of their features, applications, and safety considerations based on industry standards and case studies:

1.  Functional Differences Between Main and Auxiliary Hooks

Main Hook

High Capacity & Low Speed:

Handles heavy loads (e.g., 16–800 tonnes), with lifting speeds typically 1–5 m/min to ensure stability.

Used for primary lifting tasks, such as moving steel coils, machinery, or large containers.

Structural Design:

Larger hook dimensions and multi-sheave pulley systems (e.g., 4–6 sheaves) to distribute load stress.

Auxiliary Hook

Lightweight & High Speed:

Lifts lighter loads (typically 1/5–1/3 of the main hook’s capacity, e.g., 3.2–160 tonnes) at faster speeds (5–20 m/min).

Ideal for precision tasks like positioning small components or handling lightweight bulk materials.

Flexibility:

Operates independently or assists the main hook in complex maneuvers (e.g., tilting cargo during steel pouring).

2.  Technical Specifications

ParameterMain HookAuxiliary Hook

Lifting Capacity16–800 tonnes3.2–160 tonnes

Speed Range1–5 m/min5–20 m/min

Pulley SystemMulti-sheave (4–6)Single/double sheave

Control ModeVariable frequency driveStandard contactor

3.  Operational Guidelines

Safety Protocols

Independent Operation:

Avoid simultaneous use of both hooks unless explicitly designed for coordinated tasks (e.g., steel pouring).

Non-active hooks must be raised to their upper limits to prevent collisions.

Overload Protection:

Sensors trigger automatic shutdowns if the combined load exceeds the main hook’s capacity.

Typical Workflows

Steel Pouring:

The main hook lifts the ladle, while the auxiliary hook adjusts its tilt angle to control molten metal flow.

Warehouse Logistics:

Use the auxiliary hook for rapid pallet handling and the main hook for stacking heavy containers.

4.  Industry Applications

Steel Mills:

Main hook transports molten metal ladles (16–32 tonnes), while the auxiliary hook positions molds.

Ports:

Auxiliary hook rapidly unloads lightweight cargo (e.g., timber), freeing the main hook for containers.

Manufacturing:

Dual hooks enable parallel workflows (e.g., assembling machinery while transporting parts).