Overview
A grab crane is a highly efficient and versatile lifting equipment designed for the handling, transportation, and stacking of bulk materials. Its core functionality lies in the grab bucket mechanism, which enables rapid grabbing, lifting, transporting, and precise unloading of loose materials such as coal, ore, sand, grain, scrap metal, and more. This equipment is widely used in ports, thermal power plants, steel and metallurgy industries, mining, construction material processing, logistics warehouses, and other fields, serving as an indispensable heavy-duty material handling solution in modern industrial operations.
Structure and Components
Main Girder and End Carriages
1. The main girder is welded from high-strength steel plates, with structural forms including box girders, truss girders, or double girders, offering excellent bending and torsional resistance to accommodate large spans and heavy loads.
2. End carriages are equipped with double-flange wheels and drive systems to ensure smooth movement along the tracks.
Lifting Mechanism
1. Comprises motors, reducers, drums, wire ropes, and braking systems to control the vertical lifting of the grab bucket.
2. Dual-drum design allows independent control of the grab’s opening/closing and lifting functions, ensuring efficiency and stability.
Grab Bucket
1. Types: Options include twin-rope grabs, electro-hydraulic grabs, or mechanical grabs, tailored to material characteristics.
2. Material: Bucket bodies are made of wear-resistant steel plates or high-manganese steel, with replaceable cutting edges to extend service life.
3. Capacity: Grab volumes range from 0.5 m³ to 50 m³, with customizable designs for specific operational needs.
Trolley and Bridge Travel Mechanisms
1. The bridge facilitates longitudinal movement along the tracks, while the trolley enables transverse positioning of the grab, achieving precise 3D spatial control.
2. Equipped with variable frequency drive (VFD) systems for smooth operation and energy efficiency.
Electrical Control System
1. Utilizes PLC + VFD intelligent control, supporting remote operation, automatic positioning, and anti-sway functionality.
2. Features a touchscreen HMI (Human-Machine Interface) for real-time monitoring of parameters such as load, position, and fault diagnostics.
Applications
Ports and Terminals: Bulk cargo handling for ships (coal, iron ore, grain).
Steel and Metallurgy: Scrap metal handling, coke transfer, blast furnace feedstock supply.
Thermal Power Plants: Coal yard management and coal conveying systems.
Construction Materials: Storage and loading of aggregates, cement clinker.
Waste Management: Handling municipal or industrial waste for compaction or incineration.
Technical Specifications (Example)
| Parameter | Range |
|---|---|
| Rated Load Capacity | 5t–50t |
| Span | 10m–50m |
| Duty Class | A5–A7 (Heavy Duty) |
| Lifting Height | 10m–30m (Customizable) |
| Grab Volume | 0.5m³–30m³ |
| Control Modes | Cabin/Remote/Automatic |
Customization and Services
Tailored Solutions
Custom designs based on site conditions (span, height, track foundation), material properties (density, moisture, particle size), and operational frequency.
Full Lifecycle Support
1. Pre-sales: Technical consultation, site surveys, and solution design.
2. Post-sales: Installation, commissioning, operator training, spare parts supply, and periodic maintenance.
