Overhead Grab Crane

Product Description

Overhead grab crane is a lifting equipment with special grabs, widely used in mining, metallurgy, cement, chemical industry and power plants. Conventional bridge cranes are inconvenient when lifting loose cargo. Therefore, the overhead grab crane with grab bucket is very important. It includes a remote grab bucket and a mechanical grab bucket, and has a working class of heavy-duty A6.

Dafang Crane is an outstanding overhead grab crane manufacturer and supplier in China. Overhead grab cranes are vital for bulk material handling in metallurgy, ports, and factories, using mechanical grabs to efficiently load or unload ores, coal and grains. They have two main designs: single girder overhead grab crane and double girder overhead grab crane. Each can tailor to customers' specific operational needs.

Single girder grab cranes, with 5-32 ton capacity and 7.5-15m spans, suit light-medium duties in workshops and warehouses. They are compact and cost-effective. Double girder grab cranes, handling up to 250 tons, excel in heavy-duty scenarios like mines and ports. They boast robust stability, custom designs and higher work duty of A5-A7 for demanding operations.

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Two Types of Overhead Grab Crane

Single Girder Overhead Grab Crane

Single girder grab cranes are light-to-medium duty material handling equipment, featuring a single main load-bearing girder that ensures a compact structure and small floor space occupation. They typically handle 1–32 tons of loads with spans ranging from 7.5–15 meters.They are ideal for limited-space workplaces and for light-medium duties in workshops and warehouses.

Widely used in workshops, warehouses, and small-scale yards, they pair with single/double-rope grabs to handle grains, sand, small scrap steel, and other loose/bulk materials.

Simplified structure with a single beam, suited for light-medium duty, using electric hoists as the primary lifting mechanism. Equipped with electric hoists as lifting mechanisms and basic safety parts like limit switches, they offer low cost, easy maintenance, and meet moderate-frequency material transfer needs.

Double Girder Overhead Grab Crane

Double girder grab cranes are heavy-duty bulk material handling equipment, characterized by two parallel main girders that boost load-bearing capacity and operational stability.

Robust dual-beam design for heavy loads (up to 250 tons of loads with 10–40m spans, suiting high-intensity, heavy-duty scenarios. They boast robust stability, custom designs and higher work duty of A5-A7 for demanding operations.

Equipped with overload protection and anti-sway systems, they ensure safe, efficient transfer, meeting demanding industrial needs for large-volume, heavy-load material movement.

Widely used in mines, ports, and steel plants, they pair with mechanical/hydraulic grabs to handle ores, coal, steel slag, and other materials.

Structure And Components

The overhead grab crane consists of box girder, end beam, trolley, grab bucket, wire rope, hoisting mechanism and other safety devices. The functions of each part are as follows:

• Box Girder: Main load-bearing structure, typically made of welded steel (Q235/Q345) with camber for stability.
• End beam: Wheel assemblies enabling longitudinal movement along runways, equipped with motors, reducers, and brakes.
• Trolley: Transverse moving unit carrying the hoist, including drive systems, gearboxes, and wire rope drums.
• Mechanical/Electro-Hydraulic Grab: Customizable for bulk materials like coal or ore, with options like 2/4-rope designs or multi-petals (e.g., orange-peel grabs).
• Wire Rope: High-strength ropes (e.g., 6×19 IWRC) for lifting and grab operation.
• Hoist Mechanism: Comprises motor, brake, reducer and reels for lifting, often with dual-speed functionality for precision.
• Electrical System: Includes PLC control panels, variable frequency drives (VFDs), and pendant/remote controls.
• Limit Switches: For travel and lifting range control.
• Protección contra sobrecargas: Sensors preventing excessive loads.
• Buffers: Shock-absorbing devices at runway ends.

Overhead Grab Crane Accessories

For Material Handling

• Specialized Grabs: Hydraulic scrap grabs, wood grabs or stainless-steel grabs for corrosive environments.
• Electromagnetic Magnets: For handling ferrous materials like steel scrap.
• C-Hooks/Coil Tongs: Ideal for lifting coils or rolls.
• Laser Height Measurement: Ensures precise positioning of the grab.
• Anti-Sway System: Reduces load oscillation during movement.
• Weighing System: Integrates load cells for real-time weight monitoring.

For Safety & Maintenance

• Explosion-Proof Components: Motors, switches, and controls for hazardous environments.
• Remote Control Systems: Wireless pendants or joysticks for operator safety.
• Greasing Systems: Automatic lubrication units for reducing downtime.

Double Flap Grab

Multi Petal Grab Bucket

Four Cable Double Peel Grab

Hydraulic Grab

Mechanical Grab

PLC Control System

Características

• Steel structure: Q235B/Q345B carbon structural steel, using seamless one-shot molding technology for enhanced strength and elegance. Suitable for various operating temperatures.
• Lifting mechanism: Reducer, roller, and motor have F-grade protection.
• Hook: Premium steel forged hook for long service life.
• Wheels: Forged for compact structure, easy maintenance, high transmission efficiency, and long service life.
• Travel mechanism: Utilizes crane motors and double-brake reducers.
• Spreaders: Electric hydraulic grabs and mechanical grabs.

Overhead Grab Crane Use Application

Overhead grab cranes are mainly used for material handling to efficiently accomplish the loading, unloading, handling, and stacking of goods.

• Heavy Industry: Used in mines to transfer ore to crushing plants, steel mills to grab scrap steel and process slag. Suitable for heavy-duty, high-temperature-resistant grabs, supporting raw material supply and waste handling.
• Warehouse and Environmental Protection: Used in grain depots to transfer grain to storage and processing, wastewater treatment plants to feed incinerators, and sewage treatment plants to transport sludge. Choose multi-petal stainless steel or anti-stick grabs for both cleanliness and wear resistance.
• Energy and Power: Used in thermal power plants to grab raw coal for boilers and transport fly ash, and in coal washeries to transfer clean coal/coal sludge, ensuring fuel transportation and waste recovery. Double-rope or anti-stick grabs are often used.
• Building Materials and Chemicals: Used in cement and sand and gravel plants to transfer raw materials and finished products, and in chemical plants to transport corrosive powders and waste. Use sealed or stainless steel grabs to prevent pollution and equipment corrosion.

Energy Recycling

Waste Recycling Plants

single-girder-overhead-grab-crane

Steel Mills

Bulk Materials Disposal

Grab Bucket Selection Guide

Professional Manufacturer-Dafang Crane

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