เครนเหนือศีรษะแบบจับยึด: 17 แบบเฉพาะสำหรับการจัดการสินค้าจำนวนมากในท่าเรือ โรงงานเหล็ก และลานขยะ

Overhead crane grab is a device used for loading and unloading materials such as bulk cargo (e.g. coal, ore, gravel, etc.) or waste materials. It is usually mounted on the spreader of the crane, and operated by hydraulic or electric system for opening and closing. The main role of the grab is to achieve fast and efficient gripping and unloading by mechanised means, which is suitable for ports, steel mills, power plants and other places.

The choice of grab usually depends on the type of crane, the working environment and the characteristics of the material to be handled.

Types of Overhead Crane Grab

Mechanical Four-rope Clamshell Grab Bucket

Clamshell Structure: Mechanical
Material Handling: Bulk goods such as coal, ore, grain, etc.
Clamshell Type: Shell-shaped clamshell
Usage Environment: Ports, steel mills, coal mines, and other locations.

Mechanical Four Rope Paina Clamshell Grab Bucket

Clamshell Structure: Mechanical
Material Handling: Light and small granular materials
Clamshell Type: Shell-shaped clamshell
Usage Environment: Bulk carriers in ports

Mechanical Two-rope Clamshell Grab Bucket

Clamshell Structure: Mechanical
Material Handling: Loose bulk materials, such as ores, coal, slag, etc.
Clamshell Type: Shell-shaped clamshell
Usage Environment: Ports, power plants, docks, chemical plants, etc.

Electric Monorail Clamshell Grab Bucket

Clamshell Structure: Mechanical
Material Handling: Bulk materials such as coal, ore, grains, etc.
Clamshell Type: Shell-shaped clamshell
Usage Environment: Ports, construction sites, workshops, fire sites, warehouses, slag pits, slurry pits, etc.

Electro-mechanical Clamshell Grab

Clamshell Structure: Electric mechanical
Material Handling: Granular materials, such as ore, sand, carbon stone, slag, mineral powder, coke, coal, loose clay, etc.
Clamshell Type: Shell-shaped clamshell
Usage Environment: Material loading and unloading on land, prohibited for underwater operations.

Single-rope Hanging Grabs

Clamshell Structure: Mechanical
Material Handling: Lightweight bulk materials
Clamshell Type: Shell-shaped clamshell
Usage Environment: Small to medium-sized ports, construction sites, and storage logistics where simple grabbing operations are required. Suitable for underwater operations.

Heavy Duty Electro-mechanical Clamshell Grab

Clamshell Structure: Electric mechanical
Material Handling: Ore, limestone, slag, mineral powder, coal, coke, and other loose granular materials
Clamshell Type: Shell-shaped clamshell
Usage Environment: Material loading and unloading on land, prohibited for underwater operations.

Mechanical Four Rope Orange Peel Grabs

Clamshell Structure: Mechanical
Material Handling: Irregular and challenging materials, such as garbage, ores, scrap steel, aluminum ingots, limestone, gravel, and other materials.
Clamshell Type: Orange petal clamshell
Usage Environment: Harsh environments, such as landfills, scrap steel yards, ports, mines, and railways.

Electro-mechanical Orange Peel Grabs

Clamshell Structure: Electric mechanical
Material Handling: Large, hard materials such as ores, scrap steel, aluminum ingots, garbage, etc.
Clamshell Type: Orange petal clamshell
Usage Environment: Harsh environments, such as landfills, scrap steel yards, ports, mines, and railways. Underwater operations are strictly prohibited.

Electro Hydraulic Orange Peel Grabs

Clamshell Structure: Electric hydraulic
Material Handling: Large blocks of ore, pig iron, scrap steel, garbage, etc.
Clamshell Type: Orange petal clamshell
Usage Environment: Industries such as steel, mining, forestry, seaport terminals, scrap steel collection, waste treatment, and biomass power generation.

Electro Hydraulic Clamshell Grabs

Clamshell Structure: Electric hydraulic
Material Handling: Iron powder, slag, etc.
Clamshell Type: Shell clamshell
Usage Environment: Industries such as steel, coal mining, seaport terminals, biomass power generation, etc.

Electric Stainless Steel Grab Bucket

Clamshell Structure: Electric mechanical
Material Handling: Brewing mash, sauces, and other fermenting materials
Clamshell Type: Shell clamshell
Usage Environment: Brewing industry

Scissor Grabs

Clamshell Structure: Scissor type
Material Handling: Bulk materials
Clamshell Type: Orange segment clamshell
Usage Environment: Primarily used in large bridge-type ship unloaders at ports and docks.

Timber & Log Grabs

Clamshell Structure: Mechanical type
Material Handling: Wood, timber
Clamshell Type: Double segment clamshell
Usage Environment: Sawmills, large timber factories, paper mills, ports, and other related industries.

Rope Type Rack Cleaner Rectangular Grab Trash Rakes

Clamshell Structure: Rope-type
Material Handling: Waste, debris, floating objects, etc.
Clamshell Type: Rectangular clamshell
Usage Environment: Reservoirs, sluices, river channels, and other specific locations.

Dredging Facility Grabs

Clamshell Structure: Mechanical
Material Handling: Sludge, sand, crushed stone, and similar materials
Clamshell Type: Double-lobed clamshell
Usage Environment: Waterways, harbors, and port terminals, and other working environments.

Four-rope Leak-proof Clamshell Grab

Clamshell Structure: Mechanical
Material Handling: Grain, granular fertilizers, fine mineral sands, and other small particle overflow materials
Clamshell Type: Shell-shaped clamshell
Usage Environment: Ports, bulk carriers, large grain warehouses, bulk material stockyards, and similar working environments.

Mechanical Four-rope Clamshell Grab Bucket

The mechanical four-rope clamshell grab bucket is mainly used in conjunction with เครนเหนือศีรษะ for handling various types of loose bulk materials. It is suitable for loading, unloading, stacking, and feeding operations.

Due to differences in grab bucket capacity and the specific gravity of the materials being handled, grabs are generally classified into: light-duty, medium-duty, heavy-duty, and extra heavy-duty types.

Application Scenarios of Mechanical Four-rope Clamshell Grab Bucket

Mainly used in ports, steel plants, coal mines, etc., and commonly employed for grabbing bulk materials such as coal, ore, grain, etc.

Working Principle of Mechanical Four-rope Clamshell Grab Bucket

On the overhead crane, two sets of double-layer rope drums are equipped. Each set of drums pulls out two sets of wire ropes. One set, consisting of two ropes, is respectively tied to the inclined shells (or suspension ring and binding bolts) at both ends of the grab balance frame, serving as the supporting ropes. The other set of two ropes serves as the opening and closing ropes. These ropes pass through rope guide pulleys, head pulleys, and lower beam pulleys to form pulley blocks, which function to open and close the grab bucket.

At the beginning of the operation, the supporting wire ropes lift the grab bucket to a suitable position. Then, the opening and closing ropes are released. At this time, the weight of the lower beam forces the lower part of the bucket to open around the central axis of the lower beam. When the opening reaches the collision blocks of the two ear plates, the bucket is fully open.

When opening the grab bucket, the center distance between the upper and lower beam pulleys increases. Then, the supporting wire ropes are lowered, placing the opened grab bucket on top of the loose materials to be grabbed. The opening and closing ropes are then retracted, restoring the center distance between the upper and lower beam pulleys to the original position, thereby completing the grabbing process. At this point, the closed bucket is filled with material. Finally, both the supporting wire ropes and the opening/closing ropes are hoisted simultaneously, lifting the entire grab bucket. The crane then moves the grab bucket to the desired unloading location and opens it to release the grabbed material.

Technical Parameters of Mechanical Four-rope Clamshell Grab Bucket

Large-Capacity Mechanical Four Rope Clamshell Grab Bucket

Large-capacity mechanical four rope clamshell grab bucket are widely used in the loading and unloading of bulk cargo ships at ports. They are especially suitable for handling lightweight, fine-particle materials with low bulk density. These grab buckets typically have a larger capacity and higher filling efficiency. The working principle is the same as that of the four-rope grab system.

Key Features of Large-Capacity Mechanical Four Rope Clamshell Grab Bucket

The grab bucket features a well-designed structure with excellent rigidity. The ratio of material weight to the grab’s self-weight reaches 1.5 to 1.92, and the filling rate achieves 95% to 100%. The main bushings are made of bearing steel, while all pins are manufactured from 40Cr. The pulleys are equipped with high-temperature-resistant bearings and dual-lip rubber seals for dust and water resistance, enabling underwater operation. The cutting edges use wear-resistant alloy structural steel, which offers good weldability, easy maintenance, and high impact resistance.

Technical Parameters of Large-Capacity Mechanical Four Rope Clamshell Grab Bucket

Mechanical Two-rope Clamshell Grab Bucket

Mechanical two-rope clamshell grab buckets are mainly used in conjunction with overhead cranes, port cranes, and winches. They are widely applied in ports, power plants, docks, chemical industries, and other sectors for handling bulk loose materials such as ore, coal, slag, and more. Typical operations include loading, unloading, stacking, and feeding.

Working Principle of Mechanical Two-rope Clamshell Grab Bucket

On a double-drum winch, one drum releases a wire rope that serves as the supporting rope, while the other drum operates the opening and closing rope. After the grab bucket is opened and lowered onto the material, the closing rope is pulled in. This action drives the crossbeam, causing the two jaws to close and fill the bucket with material. The supporting rope then lifts the loaded grab bucket, which is moved by the crane to the unloading area. At the unloading site, the supporting rope remains in position while the closing rope is released, allowing the grab bucket to open and discharge the material.

Technical Parameters of Mechanical Two-rope Clamshell Grab Bucket

Electric Monorail Clamshell Grab Bucket

The electric monorail clamshell grab bucket, represented by models such as 201, 301, and DZ12, is a standardized product designed for overhead material handling. This type of crane operates along an elevated monorail track and does not occupy valuable ground space on the production floor. It performs material transfer operations by means of a trolley running on the overhead rail. During the lifting process, the grab mechanism simultaneously executes opening/closing and horizontal movement, enabling efficient and continuous bulk material handling.

Applications of Electric Monorail Clamshell Grab Bucket

This type of grab crane features simple operation, reliable performance, and high working efficiency. It is widely used in various locations such as ports, construction sites, workshops, fire zones, warehouses, slag pits, and coal sludge basins.

The electric monorail grab crane can be operated from the ground, via an overhead cabin, or through remote control, providing flexible operation modes for different working environments.

Working Principle of Electric Monorail Clamshell Grab Bucket

The working principle is similar to that of a four-rope grab crane. It is equipped with two sets of dual-drum winches. Each set extends two wire ropes: one set (supporting ropes) is connected to both ends of the grab’s balance frame, typically at the inclined shells or lifting lugs, providing vertical support. The other set (opening/closing ropes) controls the opening and closing mechanism of the grab.

These ropes pass through rope guide pulleys, head sheaves, and lower beam sheaves to form pulley blocks, enabling the opening and closing action.

At the start of operation, the supporting ropes lift the grab to the desired position. The opening/closing ropes are then released, allowing the weight of the lower beam to force the grab to open by pivoting around its main axis. When the limiting blocks on the ear plates collide, the grab is fully open.

Next, the supporting ropes lower the open grab onto the loose bulk material. The opening/closing ropes are then retracted, pulling the upper and lower sheaves closer and thereby closing the grab and securing the material inside.

Finally, both the supporting and opening/closing ropes are hoisted simultaneously, lifting the grab and transporting it via the trolley to the unloading point. The grab is opened to discharge the material, completing the operation cycle.

Technical Parameters of Electric Monorail Clamshell Grab Bucket

Electro-mechanical Clamshell Grab

Electro-mechanical clamshell grabs are suitable for handling bulk materials such as ore, sand, coal, slag, mineral powder, coke, coal, and loose clay. Motor grabs are not suitable for underwater operations.

Working Principle of Electro-mechanical Clamshell Grab

The lifting movement of electro-mechanical clamshell grabs relies on single reel hitch or hanging to the hook, which itself has a closing mechanism with a wide range of styles. I plant the production of motor grabs, open and close the movement is dependent on the installation in the grabs inside the electric hoist to complete, because it is not like four-rope grabs in the closure of the closing rope upward tension, the self-weight of all the digging role. Therefore, it has large grabbing capacity and is most suitable for grabbing difficult materials such as ores.

Technical Parameters of Electro-mechanical Clamshell Grab

Heavy-Duty Electro-Mechanical Clamshell Grab

Heavy duty electro-mechanical clamshell grabs are widely used for loading and unloading loose bulk materials such as ore, limestone, slag, mineral powder, coal, and coke. These grabs are not suitable for underwater operations.

Working Principle of Heavy-Duty Electro-Mechanical Clamshell Grab

The lifting movement is achieved through a single-drum winch or by suspending the grab from a crane hook. The opening and closing operations are performed by a motor installed at the grab head, which drives the lower beam through a gearbox and drum.

Precautions of Heavy-Duty Electro-Mechanical Clamshell Grab

• For outdoor operations, rainproof measures must be taken.
• The grab must not be used in environments containing flammable, explosive, acidic, or alkaline vapors.

Technical Parameters of Heavy-Duty Electro-Mechanical Clamshell Grab

Single-Rope Hanging Grabs

Single-rope hanging grabs are typically used in operations that require simple and efficient grabbing tasks. They are ideal for handling lightweight bulk materials in small and medium-sized ports, construction sites, and warehouse logistics environments.

Working Principle of Single-Rope Hanging Grabs

The opening and closing of a single-rope grab are achieved through the coordinated movement of elastic elements, a sliding frame, and a locking hook.

• Grabbing phase: The opened grab is lowered onto the material. As the wire rope continues to descend, the sliding frame moves downward. With the help of the springs on the sliding frame, the jaws engage the hook. When the operator lifts the sliding frame, the lower beam rises and the jaws close to grab the material.
• Discharging phase: When the fully loaded grab reaches the discharge location, the wire rope continues to descend slightly, causing the sliding frame to drop. This action releases the pressure on the hook, and under the force of the return springs, the jaws rotate and disengage from the hook. As the operator lifts the grab again, the combined weight of the lower beam and the material causes the jaws to gradually open and discharge the load.

Technical Parameters of Single-Rope Hanging Grabs

Mechanical Four Rope Orange Peel Grabs

The mechanical four-rope orange peel grabs are mainly used in conjunction with the bridge-traveling crane. It is well-suited for small to medium-sized ports, construction sites, and warehousing/logistics facilities for handling light bulk materials.

Working Principle of Single-Rope Hanging Grabs

The opening and closing of a single-rope grab relies on the coordinated motion of elastic elements, a sliding frame, and locking hooks.

• Grabbing: When the opened grab is lowered onto the material, the wire rope continues to descend, causing the sliding frame to move downward. The spring installed on the frame causes the jaws to lock onto the hook. When the operator lifts the sliding frame, the lower beam rises and the jaws close, completing the grabbing action.
• Unloading: When the loaded grab is positioned above the stockpile or unloading area, the wire rope continues to lower slightly, allowing the sliding frame to descend. This releases the pressure on the hook, and under the force of the upper compression spring, the jaws rotate and disengage from the hook. When the operator lifts the rope again, the jaws gradually open under their own weight and the weight of the lower beam and material, completing the unloading process.

Electro-Mechanical Orange Peel Grabs

Electro-mechanical orange peel grab (also known as multi-jaw grab).The motor-driven orange peel grab is designed for use with hook-type cranes (or cranes with a single hoisting drum). It is mainly used for loading and unloading large, hard materials such as bulk ore, scrap steel, aluminum ingots, and waste. Underwater operation is strictly prohibited.

Working Principle of Electro-Mechanical Orange Peel Grabs

The grab is opened by the self-weight of the crossbeam and bucket part. The electric hoist pulls the crossbeam to close the jaw when grabbing material.

Structure of the Electro-Mechanical Orange Peel Grabs

1. Head Section; 2. Connecting Rods; 3. Cross Beam; 4. Electric Hoist; 5.Head Section (repeated component)

Electro Hydraulic Orange Peel Grabs

Electro-hydraulic orange peel grabs adopadopt advanced electric-hydraulic mechanical technology, featuring a large gripping force and high degree of automation. This tool is ideal for loading and unloading large ores, pig iron blocks, scrap steel, rubbish, straw, and other materials. It is primarily used in the steel, mining, forestry, harbour terminal, scrap steel acquisition, rubbish disposal, bio-power generation, other industries.

This product has compact structure, beautiful modelling, energy saving and easy operation. According to different industries and use occasions and gripping materials have different types of selection, multi-flap is divided into round and rectangular, the bucket claw has a closed form, semi-open form and open form.

Technical Parameters of Electro Hydraulic Orange Peel grabs

Electro Hydraulic Clamshell Grabs

The electro-hydraulic clamshell grab adopts advanced electric-hydraulic mechanical technology, with large gripping force and high degree of automation, which is an ideal tool for loading and unloading iron powder, slag and other materials. It is mainly applied to iron and steel, coal mine, harbour terminal, bio-power generation and other industries.

Technical Parameters of Electro Hydraulic Clamshell Grabs

Electric Stainless Steel Grab Bucket

Electric stainless steel grabs are specially designed for the brewing industry, grabs for brewing currants, sauces, sauce-making classes, etc.. The use of DBZ-type grabs not only reduces the labour intensity of workers, but also facilitates the cleanliness and hygiene of the production workshop.

Technical Parameters of Electric Stainless Steel Grab Bucket

Scissor Grabs

Scissor grab is the two jaws by the hinge point of the end of the extension of the rope-type force arm, the two arms common one called the centre of the hinge point, scissor grab to open the action relies on the relaxation of the shear arm at the shear arm pulley set of steel wire rope, tighten the support rope to complete the closure action relies on the tightening of the pulley set of steel wire rope, the use of leverage to increase the force, so that the jaws close to grab material, the closure of its torque with the closure of the process of the platform gradually increased, grab material clean and not The closing torque increases gradually with the process of closing the table, and the material is grasped cleanly without leakage, which is mostly used in the large bridge ship unloader.

Technical Parameters of Scissor Grabs

Timber & Log Grabs

Timber grab is suitable for timber mills, large wood products factories, paper mills, ports and other industries, used for unloading ships, loading barges, tie-up rows, loading trucks and heaps of demolition and miscellaneous, its structure is divided into a single-rope, double-rope, four-rope, electric four types, but also according to the user’s needs for the design and manufacture.

Technical Parameters of Log Grabs

Rope Type Rack Cleaner Rectangular Grab Bucket for Floating Debris

The rope type rack cleaner rectangular grab is an ideal tool designed for removing debris, floating materials, and waste from specific environments such as reservoirs, sluice gates, and waterways. It is especially suitable for cleanup operations in hydraulic engineering and water conservancy projects.

Technical Parameters of Rope Type Rack Cleaner Rectangular Grab Trash Rakes

Dredging Facility Grabs

The dredging grab is an ideal attachment designed for use with double-rope or four-rope cranes in underwater operations such as dredging and material handling in sea and river channels, port terminals, and similar environments. It is specifically suitable for grabbing and removing materials like silt, sand, and gravel from beneath the water surface.

Technical Parameters of Dredging Grabs

Four Rope Leak Proof Clamshell Grab

The leak-proof grab bucket is specially designed for handling fine, free-flowing bulk materials such as grain, powdered fertilizer, and fine mineral sand. It is ideal for use in ports, bulk carriers, large granaries, and bulk storage yards. This type of grab is engineered to minimize spillage during loading, unloading, and transportation, making it an efficient and reliable tool for handling materials prone to leakage.

Technical Parameters of Four Rope Leak Proof Clamshell Grab