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The clamshell grab bucket is a crane attachment composed of two hinged shells that open and close to grab, lift, transport and discharge bulk materials. It efficiently handles sand, stone, coal, ore, grain, scrap metal, waste and other similar loose materials, and is applicable to a wide variety of industrial environments.
For port terminals, steel mills, mining operations, and waste treatment facilities, the clamshell grab is one of the most practical and widely adopted crane attachments. It reduces manual labor, speeds up loading and unloading, and can be directly integrated with existing crane infrastructure. Clamshell grabs are extensively used on overhead bridge cranes, gantry cranes, port cranes, and shipboard cranes around the world.
Mechanical clamshell grab buckets components
Grab Shells
As the core components of a clamshell grab, the two opposing half‑shells open and close to capture bulk materials. Manufactured from high‑strength steel or other wear‑resistant materials, they are designed to withstand heavy loads and abrasion from abrasive cargo.
Pivot Pins
Pivot pins connect the grab shells to the hydraulic cylinders and the main body. They allow the shells to rotate around a fixed axis, enabling smooth, controlled opening and closing movements.
Teeth or Cutting Edges
Teeth or cutting edges can be fitted to the grab shells based on working conditions. Teeth penetrate and break hard materials such as rock and compacted soil, while cutting edges are designed for softer substances like sand and loose earth.
Wear Plates / Liners
To extend the service life of clamshell grabs, wear plates or liners can be installed inside the grab shells. Made of wear‑resistant materials, these components protect the shells from direct contact with abrasive materials and significantly reduce abrasion.
Lifting Mechanism
The lifting mechanism serves as the connector that attaches the clamshell grab to a crane or excavator. It may consist of hooks, chains, or other connecting fittings, depending on the specific equipment in use.
Main Functions
The clamshell grab performs four core functions in bulk material handling operations:
Digging and scooping ：penetrates material piles or seabeds to capture a fixed volume of materials.
Lifting and transporting ：firmly holds the loaded material while the crane moves.
Precise discharging ： accurately releases materials at target positions.
Recurring cyclic operation ： reliably completes continuous high‑frequency loading and unloading work.
Technical Date
| Crane lifting capacity(t) | 5 | 6 | 8 | 10 | 12 | 16 | 20 | 25 | 30 | |
| Grab volume(30°)(m³) | 1.5 | 1.7 | 2.3 | 3.1 | 3.7 | 5 | 6.2 | 8 | 10 | |
| Sheave diameterφ(mm) | 400 | 400 | 450 | 480 | 500 | 560 | 650 | 720 | 820 | |
| Steel rope specificationsφ(mm) | 15.5 | 17.5 | 19.5 | 21.5 | 24 | 26 | 28 | 30 | 32 | |
| Parameters(mm) | A | 2650 | 2690 | 2840 | 3000 | 3050 | 3420 | 3700 | 3920 | 4750 |
| B | 3230 | 3270 | 3270 | 3500 | 3550 | 4070 | 4320 | 4620 | 5410 | |
| C | 2400 | 2440 | 2660 | 2880 | 3000 | 3400 | 3600 | 3740 | 4200 | |
| D | 3020 | 3660 | 3780 | 4000 | 4180 | 4660 | 4960 | 5280 | 5720 | |
| Dead weight(t) | 2.7 | 3.2 | 4.2 | 5 | 6 | 8 | 10 | 12 | 14 | |
| Working height(m) | 7.5 | 9 | 9.8 | 10.5 | 11.2 | 12 | 12.8 | 14 | 15.2 | |
Sing-rope Clamshell Grab
Single-rope ground-triggered grab bucket is specially designed for cranes equipped with a single hoist drum to realize opening and closing of the grab bucket. It is suitable for grabs used in underwater operations with single-cable ship cranes
Two-rope clamshell Grab
Double-rope grab buckets require cranes fitted with two separate hoist drums for the holding rope and closing rope respectively. Such grabs are widely used at ports, terminals and industrial sites to load and unload various bulk materials, including sand, gravel, coal, iron ore and mineral powder.
Four-rope Clamshell Grab
Four-rope ground-operated grabs are designed for heavy-duty material handling, equipped with two holding ropes and two closing ropes. The holding ropes bear the weight of the grab, while the closing ropes transmit power to enable smooth opening and closing movements.
Application
The clamshell grab bucket is a material handling attachment designed to grab and lift bulk materials such as sand, gravel, grain, coal, fertilizer, and waste. It consists of two hinged jaws that open and close like a clam – hence the name.
Construction sites – excavation and foundation work
Ports and ship unloading – bulk cargo (coal, sand, grain, etc.)
Mines and quarries – material handling and waste management
Steel plants and cement plants – raw material handling
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