Four Cable Multi Petal Mechanical Grab

The four-cable multi-petal mechanical grab (typically 4-rope 6-flange or 4-rope 8-flange) is an efficient material handling system specifically designed for large, loose, or viscous bulk materials such as scrap steel, ores, waste, and coal. Its core feature lies in the use of four steel cables to drive a multi-flange (typically 6-8 flanges) jaw plate structure. Compared to dual-flange grabs, this design offers enhanced adaptability and stability during material handling, making it particularly suitable for complex material processing scenarios.

Multi-petal plate: Usually consists of 6 or 8 petals (a few customized models can have up to 12 petals). The petals are designed to close tightly, forming a sealed material space to reduce leakage. The material is typically high-manganese steel or wear-resistant alloy, and some models include anti-adhesive linings or toothed edges for specific working conditions.
 

Four-rope system:

• Support ropes (2): Bear the weight of the grab and the material.
• Opening and closing ropes (2): Control the movement of the multiple petals via a pulley set, requiring high synchronization.
• Central hinge mechanism: Multiple jaw plates rotate around a central axis and are driven synchronously by a connecting rod or gear to ensure uniform movement of each jaw.
• Balance beam and pulley group: Optimize force distribution to prevent uneven load and reduce wear on the steel wire rope.

• High grab rate: The multi-petal design accommodates irregular materials (e.g., scrap steel, stone blocks) and minimizes leakage.
• Powerful closure: The wire rope's pulling force is amplified by the lever principle, making it suitable for large or viscous materials (e.g., wet clay, garbage).
• Excellent stability: The four ropes share the load, and the synchronized movement of the petals prevents tilting caused by uneven force.
• Anti-sticking and anti-blocking: The multi-petal structure reduces material adhesion, and the gaps between petals are designed to minimize the risk of material sticking.

Scrap steel recycling: Grabbing crushed cars and metal scraps (requires high-strength petals and impact-resistant design).
Mining: Loading and unloading large ore or gravel (equipped with alloy teeth).
Waste treatment: Capturing waste in incineration plants or landfills (requires anti-corrosion and anti-clogging design).
Coal/coke handling: Transporting viscous coal powder or large coke pieces (features anti-stick coating).
Ship cleaning: Efficient material removal in narrow cabins (multi-petal design adapts to complex spaces).

• Material characteristics: Particle size, hardness, viscosity (e.g., scrap steel requires impact resistance; garbage requires corrosion resistance).
• Number of petals: Typically 6–8 petals; more petals (e.g., 12) can be selected for highly viscous materials.
• Volume and opening: Larger openings suit scrap steel; deeper bins suit coal.
• Drive matching: Calculate the tension of the opening/closing ropes to ensure the crane winch has sufficient power.

Generally applicable to materials with a density of 0.7t/m³

Note: It can be customized according to customer needs.

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