QZ Grab Overhead Crane

Grab Overhead Crane, also called "Waste Handling Crane," is a kind of heavy lifting equipment specially used in waste transfer stations, incineration plants, landfills, recycling centers, etc. It is mainly used for gripping, handling, stacking, and sorting all kinds of solid wastes, such as domestic wastes, industrial wastes, and construction wastes.

Garbage Grabbing and Handling: Grab Overhead Crane is equipped with hydraulic or electric grabs, which can efficiently grab loose materials (e.g. garbage, scrap metal, waste plastics, etc.).

Sorting and stacking: Used in garbage sorting lines with a magnetic separator or manual sorting to separate recyclables from waste.

Feeding and landfilling: In incineration plants or landfills, waste is fed into the treatment equipment or landfilled in layers of compaction.

A Grab Crane mainly consists of a bridge frame, an electric trolley, electrical equipment, and a grab etc. The bridge frame provides a stable support structure for the whole bridge crane. It carries the weight of each component and the load during lifting.

Bridge Girder: spanning the working area, the trolley runs horizontally along the track. Lifting trolley: The trolley runs along the bridge and moves horizontally, equipped with a lifting mechanism and an opening and closing mechanism.

Grab Bucket: Usually double or multi-valve clamshell structure, opening and closing is controlled by wire rope or chain, suitable for bulk materials such as coal, ore, grain, etc.

The waste handling cranes can choose different types of grabs according to the material characteristics, such as light grabs (grain), medium grabs (coal), heavy grabs (ore), and special grabs (garbage, scrap steel, etc.). Common grab buckets are of the following two types:

Clamshell Grab

Structural features: composed of two symmetrical jaw flaps, similar to the “clamshell”, through the wire rope or hydraulic cylinder control, opening and closing.

Applicable materials: coal, ore, gravel, grain, and other bulk materials with good fluidity. Advantages: simple structure, easy maintenance, and even gripping force.

Orange Peel Grab

Structural features: composed of 4~6 curved jaw flaps, similar to “orange peel”, forming a confined space when closed.

Applicable materials: steel scrap, garbage, irregular lump materials (such as metal scrap, construction waste).

Advantage: wide gripping range, adaptable to complex-shaped materials, and good leakage prevention.

• Double-box main girder structure: Welded box double beams with stress relief treatment, high integral rigidity, strong anti-bending & anti-torsion capacity, large load range.
• Hydraulic clamshell grab bucket: Multi-jaw hydraulic grab with independent opening/closing hydraulic system; flexible jaw opening for bulk material grabbing, adjustable grab capacity according to material density.
• Independent multi-mechanism layout: Separate mechanisms for hoisting, trolley travelling, crane travelling and grab closing; each drive set with independent brake, mostly VFD variable frequency optional for stable speed regulation.
• Complete multi-safety protection: Overload limiter, upper/lower lifting limit, trolley end limit, crane travel buffer & anti-collision device, grab overload protection; optional cab or remote wireless control.
• Heavy-duty working class: FEM A6/A7 high duty cycle design, suitable for continuous 24h frequent grabbing operation.

• High bulk handling efficiency: Grab realizes automatic digging, grabbing, lifting and dumping in one cycle, 3~6 times higher efficiency than manual loading with hook crane, saves plenty of labor cost.
• Strong adaptability for various bulk goods: Hydraulic grab matches coal, mineral sand, garbage, grain, slag etc.; jaw opening adjustable to fit different stacking shapes.
• Stable & safe continuous operation: Double beam heavy load structure bears frequent impact load from grabbing; multiple brake & limit systems effectively avoid tipping or falling risks.
• Large operation coverage: Whole crane runs along factory building, trolley moves transversely on main beam to cover full pit/stockyard space without blind area for material fetching.
• Energy-saving & low maintenance: VFD configuration reduces starting impact and power consumption; standardized spare parts, convenient on-site overhaul.

• Thermal power plants: Coal yard raw coal storage, ash slag cleaning and transportation.
• Waste-to-energy incineration plants: Municipal solid waste, industrial waste grabbing, feeding and slag removal.
• Mines & mineral processing factories: Ore, gravel, raw stone stockyard transfer.
• Grain storage depots: Bulk grain, corn, rice automatic stacking and reclaiming.
• Steel mills & scrap yards: Scrap steel, metal block material handling with orange peel grab.
• Cement plants, chemical raw material warehouses: Bulk powder, limestone raw material transportation.
• Indoor port bulk cargo warehouses: Sand, mineral aggregate loading and stacking.