A rehandling grab is a hydraulic or mechanical device used to move bulk materials in ports, recycling facilities, and steel mills. This guide explains how they work, where they are used, and why they are essential in modern material handling.
Definition & Operation
Rehandling Grab: A rehandling grab is a mechanical auxiliary device that is attached to a crane or excavator to pick up, hold, and move bulk materials. The apparatus consists of several curved segments (shells) that open and close hydraulically or mechanically, similar to how a human hand grasps objects.
How Does It Work?
- Approach: Position the grab above the material with the shells open
- Penetration: The grab penetrates the material by its own weight
- Close: Hydraulic cylinders or cable tension close the shells
- Hoisting: The crane lifts the filled grab
- Transport: The material is moved to the unloading area
- Release: Open the shells and let the material fall out
Types of Rehandling Grabs
Hydraulic Grab
Uses hydraulic cylinders for closing force. Provides more power and control, ideal for dense materials such as scrap and rocks.
- ✓High closing force
- ✓Precise control
- ✓Suitable for heavy materials
Mechanical Grab
Works with cables for opening and closing. Simple, reliable, and cost-effective for lighter bulk materials.
- ✓Lower purchase costs
- ✓Minimal maintenance
- ✓Proven reliability
Electro-Hydraulic Grab
Combines electrical drive with hydraulics. Independent of the crane, offering maximum flexibility.
- ✓Independent operation
- ✓No additional hydraulic equipment required
- ✓Ideal for retrofitting
Applications
Ports & Shipping
Unloading and loading of bulk materials such as grain, coal, ores, and scrap into containers.
Recycling & Waste Management
Processing of metal scrap, construction and demolition waste, paper, and plastic.
Steel Industry
Transport of scrap to blast furnaces, handling of pellets and ores.
Construction & Infrastructure
Moving sand, gravel, rocks, and other construction materials.
Frequently Asked Questions
What is the difference between a rehandling grab and an orange peel grab?
A rehandling grab is the general term for grabs that move material. An orange peel grab is a specific type with 4-8 curved shells, ideal for irregular materials such as scrap. All orange peel grabs are rehandling grabs, but not all rehandling grabs are orange peel grabs.
How much does a rehandling grab cost?
The price ranges from €15,000 for small mechanical grabs to €150,000+ for large hydraulic systems. Factors include: capacity, type (mechanical/hydraulic/electro-hydraulic), material, and custom features. Request a quotation for an exact price.
How long does a grab last?
With proper maintenance, a quality grab will last 15-25 years. Wear parts such as shells and bushings need to be replaced regularly (every 2-5 years depending on usage). Preventive maintenance is essential.
Can I attach a grab to any crane?
Not every grab fits every crane. Important factors include crane capacity (must support the weight of the grab plus load), hoisting system (mechanical: 2/4-rope, hydraulic: additional hoses required), and lifting height. Always consult a specialist.
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