A Grab Overhead Crane is a specialized overhead lifting system designed to handle loose, bulk, and granular materials using a grab bucket instead of a conventional hook. Unlike standard bridge cranes that lift loads using slings or hooks, a Grab Overhead Crane uses a mechanical, hydraulic, or electro-hydraulic grab bucket to collect, transport, and discharge materials efficiently. This type of crane is widely used in industries that handle coal, ore, limestone, sand, gravel, biomass fuel, mu At Yuantai Crane, our Grab Overhead Crane systems are engineered for continuous-duty industrial operations.

grab bucket

Types of Grab Bucket Bridge Crane Lifting Devices

The grab is one of the most important components on a grab bridge crane. Different materials require different grab designs; for example, coal, sand, scrap metal, grain and wood chips all have unique handling characteristics. Selecting the appropriate grab can significantly improve production efficiency, reduce material loss and extend the service life of the equipment. Yuanta offers a wide range of grab crane systems to meet the application requirements of various industries, including ports, power stations, steelworks, waste treatment plants, mines, cement plants and bulk material yards.

1. Mechanical Grab Bucket

A mechanical grab bucket is one of the most commonly used lifting devices for grab bridge cranes. It operates through wire ropes and pulley systems connected to the crane trolley. The opening and closing movements of the bucket are controlled mechanically without requiring a separate hydraulic power source. This design offers a simple structure, reliable operation, and relatively low maintenance costs. Mechanical grab buckets are widely used for handling coal, sand, gravel, ore, clinker, limestone, and other loose bulk materials. They are particularly suitable for continuous loading and unloading operations where high reliability and long service life are required.

2. Hydraulic Grab Bucket

A hydraulic grab bucket uses hydraulic cylinders to control the opening and closing of the grab jaws. Compared with mechanical grabs, hydraulic grabs provide stronger gripping force and more precise control. This makes them suitable for handling difficult materials such as scrap metal, construction waste, large rocks, mixed industrial waste, and irregularly shaped materials. Hydraulic systems allow operators to adjust gripping pressure according to the material being handled, improving loading efficiency and reducing material spillage. These grab buckets are commonly used in recycling facilities, waste treatment plants, steel processing workshops, and demolition projects where material characteristics vary significantly from load to load.

3. Orange Peel Grab Bucket

The orange peel grab bucket is specifically designed for handling bulky and irregular materials. Its multiple curved tines resemble the segments of an orange peel, giving the grab its name. This design allows the bucket to penetrate deeply into piles of scrap and securely hold materials of different shapes and sizes. Orange peel grabs are commonly used for handling scrap steel, steel turnings, pig iron, metal waste, industrial scrap, and recycling materials. The strong gripping force and flexible jaw design make this type of grab ideal for steel mills, foundries, scrap yards, and metal recycling centers.

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4. Clamshell Grab Bucket

The clamshell grab bucket consists of two symmetrical shells that close together to capture material. The design offers a high filling factor and efficient discharge performance. Clamshell grabs are commonly used for coal handling, sand loading, gravel transport, fertilizer handling, ore transfer, grain movement, and other free-flowing materials. Their simple design helps reduce maintenance requirements while maintaining high productivity.

5. Multi-Shell Grab Bucket

A multi-shell grab bucket uses several jaws working together to capture materials more effectively than standard two-shell designs. The multiple gripping points improve stability and reduce material loss during lifting. This type of grab is often selected for handling large scrap pieces, steel waste, industrial debris, and bulky materials that require stronger holding capability. Multi-shell grabs can be configured with hydraulic or electro-hydraulic systems depending on the application.

6. Timber Grab Bucket

A timber grab bucket is specially designed for handling logs, timber bundles, wooden poles, and forestry products. Instead of enclosed shells, the grab uses curved arms that securely hold cylindrical materials. This design allows operators to load, unload, and stack timber efficiently without damaging the material. Timber grabs are widely used in sawmills, lumber yards, paper mills, wood processing facilities, and forestry operations.

Grab Bucket Types Comparison Table

Grab Bucket Type Best Material Main Advantage Typical Industry
Mechanical Grab Coal, sand, ore Simple and reliable Ports, power plants
Hydraulic Grab Scrap, waste, rocks Strong gripping force Recycling, demolition
Orange Peel Grab Scrap metal Excellent for irregular materials Steel mills, scrap yards
Clamshell Grab Sand, coal, grain High filling efficiency Mining, ports
Multi-Shell Grab Heavy scrap Strong holding capability Industrial recycling
Timber Grab Logs and timber Prevents material damage Forestry, lumber yards

Overhead Crane with Grab Bucket Specifications

Below is standard overhead crane parameters for reference, tailor-made crane solution is available. If the product is upgraded and optimized, the parameters may be different.

QZ Overhead Crane with Grab
Lifting capacity ton 10
Span S（m） 10.5 13.5 16.5 19.5 22.5 25.5 28.5 31.5
Lifting height m 18 18 18 18 18 18 18 18
Lifting speed m/min 39.3 39.3 39.3 39.3 39.3 39.3 39.3 39.3
Trolley speed m/min 45.9 45.9 45.9 45.9 45.9 45.9 45.9 45.9
Crane speed m/min 112.5 112.5 112.5 101 101 101 101 101
Lifting motor kw 37 37 37 37 37 37 37 37
Trolley motor kw 5.5 5.5 5.5 5.5 5.5 5.5 5.5 5.5
Total weight kg 20800 22400 25200 29100 32800 36200 39900 42900
Max Wheel Load KN 113 121 131 142 152 162 172 180
Track 　 P43 P43 P43 P43 P43 P43 P43 P43
Main dimension mm 10.5 13.5 16.5 19.5 22.5 25.5 28.5 31.5
Rail top to main top H1 2078 2078 2078 2189 2189 2189 2189 2189
Rail top to girder bottom H2 815 815 815 940 940 940 940 940
Wheel base W 4000 4000 4000 4100 4100 5000 5000 5000
Crane width B 6913 6913 6913 6963 6963 7413 7413 7413
Hook left limitation S1 2015 2015 2015 2015 2015 2015 2015 2015
Hook right limitation S2 1850 1850 1850 1850 1850 1850 1850 1850
Trolley gauge K 2000 2000 2000 2000 2000 2000 2000 2000
QZ design

Grab Overhead Crane Main Components

A grab overhead crane consists of several major components that work together to handle bulk materials safely and efficiently. Each component plays an important role in lifting, moving, positioning, and unloading materials during operation. The overall performance, reliability, and service life of the crane largely depend on the quality of these components and how well they are integrated.

1. Grab Overhead Crane Bridge Structure

The bridge structure forms the primary load-bearing framework of the crane and supports all moving components, including the trolley, hoisting mechanism, and grab bucket. Yuantai uses high-strength steel structures that are designed to handle heavy loads and continuous operation in demanding industrial environments. The bridge girder is manufactured with precise fabrication techniques to ensure structural stability, minimize deflection, and maintain smooth crane travel. A robust bridge structure helps improve operational safety, extends equipment life, and reduces maintenance requirements over time.

2. Grab Overhead Crane Hoisting System

The hoisting system is responsible for lifting and lowering the grab bucket during material handling operations. It typically includes heavy-duty electric motors, wire rope drums, gear reducers, electromagnetic brakes, and various safety limit devices that work together to provide reliable lifting performance. Since grab cranes often perform frequent lifting and closing cycles, the hoist is specially designed to withstand continuous operation and repeated load changes. The system delivers stable lifting speed, precise control, and dependable braking performance, helping improve productivity while maintaining safe operation.

3. Grab Overhead Crane Trolley Assembly

The trolley assembly carries the grab bucket and travels along the bridge girder to position the load accurately within the working area. It consists of a strong trolley frame, wheel assemblies, drive motors, transmission components, and related control systems. Precision-engineered wheels and drive mechanisms allow smooth movement and stable operation, even when handling heavy materials. Accurate trolley positioning helps improve material handling efficiency, reduces cycle times, and enables the crane to work effectively in warehouses, stockyards, ports, power plants, and manufacturing facilities.

4. Grab Overhead Crane Grab Bucket

The grab bucket is the most important working device of the crane because it directly interacts with the material being handled. Different grab bucket designs are available to suit various materials and operating conditions. For example, clamshell grabs are commonly used for sand, coal, gravel, and other bulk materials, while specialized grab buckets can be selected for scrap metal, biomass, waste, ore, or wood chips. The bucket's capacity, opening size, closing force, and structural design all affect handling efficiency.

5. Grab Overhead Crane Electrical Control System

The electrical control system serves as the central operating platform of the grab overhead crane. It integrates advanced technologies such as PLC control, variable frequency drives (VFDs), anti-sway control functions, position monitoring systems, and optional intelligent automation features. These technologies allow operators to control crane movements more accurately, improve positioning precision, and reduce load swing during operation. Modern control systems also support fault diagnosis, operational monitoring, and automated functions that help increase efficiency, enhance safety, and simplify daily crane management.

FAQs about Grab Overhead Cranes

1. Which grab bucket is best for scrap metal?

Orange peel grab buckets and multi-shell grab buckets are typically the best choices for scrap metal handling because they provide strong gripping force and can securely hold irregular materials.

2. Can a grab overhead crane use different grab buckets?

Yes. Many grab overhead cranes can be equipped with different grab bucket types depending on the material handling requirements. Some cranes can even use interchangeable lifting devices.

Why Choose Yuantai Crane?

Give you multiple returns

Yuantai's crane products have currently served more than 150 countries around the world, and have created wealth for customers that is several times the price of the crane machine, and it is still going on.

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Professional and customized crane solutions can better match customers' working conditions. High-quality crane products make customers more assured and worry-free when use.

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Our services run through all aspects of product design, production, installation and spare parts support. Taking customers as the center and taking high-quality products as the core carrier, realize the service concept of customers buying with confidence and using them with confidence.

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