Types of crane grab buckets

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Based on different standards, the crane grab buckets can be classified into different types. And the general classifications of crane grab buckets are as follow:

1. On grab bucket shape

Based on grab bucket shapes, crane grab buckets can be classified into clamshell grab buckets, orange peel grab, and cactus grab bucket.

Clamshell grab

Clamshell grab bucket is the most common one which is used in silty, clayey and sandy materials.
The orange peel grab bucket is frequently applied to remove the large irregular pieces of rock and other irregular pieces. With 8 jaws, the orange peel grab usually do not close very well.
Cactus grab bucket is used to handle the coarse and fine materials at same time. With 3 or 4 jaws that close very well in the closed position and form a proper bucket.

Cactus grab bucket

2. On bulk density of materials

According to bulk density of materials, crane grab buckets can be grouped in light, medium, heavy, and extra heavy crane grab basket.

Light crane grab bucket is used to handle materials with the bulk density of γ< 1.2t / m³ , such as dry grain, little bricks, lime, fly ash, aluminum oxide, sodium carbonate, dry slag , etc.
Medium crane grab bucket is used to handle materials with the bulk density of γ=1.2t/ m³~2.0t/ m³, such as, gypsum, gravel, pebbles, cement, large blocks, etc.
Heavy crane grab bucket is used to handle materials with the bulk density ofγ= 2.0t / m³ ~2.6 t / m³, such as, hard rock, small and medium-sized ore and scrap steel, etc.
Extra heavy crane grab bucket is used to handle materials with the bulk density ofγ>2.6t / m³,such as, heavy ore, scrap steel, etc. .

3. On mechanical principals

Ropes grab. The crane grab buckets can be classified into single rope grab bucket, double rope grab bucket, and four rope grab buckets.
Power self-supplied grab. The power self-supplied grab is usually referred to the one with electric motor, which is not suitable for underwater work.
Non power self-supplied grab. The non-power self-supplied grab is mainly referred to electric hydraulic grab and pneumatic type grab.

Introduction to Common Grab Types

Rope crane bucket

Crane bucket is a kind of hoist lifting spreader which can crane bucket varieties of bulk materials, divided into four rope type, double rope type, single rope type, electric type, discs type, shear type, hydraulic type and log type, etc.

Single rope crane bucket:Single rope crane bucket apply to the crane only have one lifting reel, freely opened and closed during loading and unloading of bulk materials, the whole crane is easy to use and disassembly, suitable for underwater operations crane bucket and stack. Single rope crane bucket unable to open in the air, hand and remote control type can be realized to open in the air.
Double rope crane bucket: Suitable for double hoisting mechanism crane, apply to crane bucket all kinds of loose debris. Two hoisting mechanisms, one is responsible for crane bucket lift, another is for crane bucket opening and closing.
Four rope crane bucket ;With good strength, light weight, reasonable structure, material crane bucket finer and smaller. Blade plate using special wear-resistant plate, enhancing the degree of impact and friction, multi-layer sealing process using on pulley, dust and water can be operated underwater, blade plate seam gap is small which can reach 0.3mm, can maintain a cleaner workplace, the overall structure is not easy to deform, four rope crane bucket can also be designed to double rope crane bucket.

Clamshell grab

Clamshell grab consist of two integral buckets, orange peel grab include three or more movable jaw. Regarding to clamshell grab, it is mainly matched with bridge crane to grab different kinds of loose deposits for loading, unloading, shifting, charging and other operation.

Owing to clamshell grab have different volume; the rate of material is diverse. We usually divide the clamshell grab into four categories: light duty, middle duty, heave duty and extra-heavy duty.

Clamshell grab advantages:

First class quality with competitive price
Compact design
Reasonable structure, favorable performance
Control the load easily and position the load exactly
Smooth starting and stopping
Superior safety and reliability

Orange peel crane bucket

Four rope orange peel grab: Mainly for handling of irregular shape materials such as scrap, refuse, gravel etc., suitable for steel mills refuse plants, port and railway.

Orange peel crane bucket main parameters：

Capacity of orange peel grab : 4-30M3
Dead weight of orange peel grab: 5.5-20T
Cargo density of orange peel grab: 0.8-2.5T/M3
Dia of rope:28MM
Dia of pulley: 520MM
Structure material:Q345B
Pulley of orange peel grab:Q345B hot rolled
Axes of orange peel grab: 42CrMo
Bushing of orange peel grab: ZGMn13

Motor driving crane bucket

The electric motor driving crane bucket got lots of types, our company equips the crane grab with standard electric block as switching mechanism, The motor crane grab can be considered that the closed drum is moved to the grab, Due to the closed its huge grabbing force, It is used to grab hard materials as ores, etc.

Main parameters of motor driving crane bucket

Volumes of crane bucket: 0.3--6 M3
Type of crane bucket: light, middle, heavy
The proportion of materials <2
Capturing the materials: 0.45--6 t
Percentage of pulley: 4--5
The diameter of steel wires 7.7--16 mm
The diameter of pulley: 250--400 mm
Self-weight of crane grab: 0.95--5.6 t
Tons of the match hoist crane 2--15 t
Total height of crane grab: 1850--3700 mm
Crane bucket can be designed as customer demand.

Scissor crane bucket

Scissor crane bucket relies on wire rope retractable to close and open the crane bucket jaw. its closing moments increased gradually during closing process, does not leak and clean material when crawling materials, mostly used for ship unloader.

Electric stainless steel crane bucket

Designed specifically for the brewing industry, crane bucket help brewing koji, sauce, and sauce making, etc., reduce the labor intensity of the workers, is conducive to the clean and sanitation of production floor.

Electric hydraulic crane bucket

Design and manufacturing according to FEM / DIN standard, import the main hydraulic components. Big Grasping force, high degree of automation, it is ideal handling tools for large pieces of ore, pig iron, scrap, waste, iron, straw, slag and other materials. It is mainly used in iron and steel, mining, forest farm, coal mining, harbor dock, scrap steel acquisition, garbage disposal, bioelectrogenesis and other industries.

Depending on different industries, using occasion and the crane bucket materials, electro-hydraulic crane bucket divided into discs type and two discs type. Orange Discs type is divided into circular and rectangular, its claw including closed, semi-open and open type.

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