Grab bucket overhead crane is a specialized lifting equipment designed for precise and efficient handling of bulk materials. Unlike conventional cranes, Grab overhead cranes are equipped with a grab, which is a key component for gripping and lifting loose materials such as coal, sand or gravel. Grab cranes are mainly composed of a bridge frame, crane travelling mechanism, trolley, electrical equipment and grab. Grab bucket overhead cranes are widely used in power stations, warehouses, workshops and harbours for loading and unloading some scattered items.
Grab overhead cranes and hook overhead cranes are the most popular types of double girder overhead cranes. Below are the parameters of double girder grab overhead cranes:
Crane Type
QZ Grab Bucket Overhead Crane
Lifting Capacity
5~550t
Span
10.5~35.5m
Lifting Height
/
Working Class
A4~A7
Ambient Temperature
-20~40℃
[ QZ Grab Bucket Overhead Crane Specification ]
Advantages of Grab Overhead Cranes
Improved efficiency The design of the grab enables fast and efficient material handling, greatly reducing downtime and improving overall operational efficiency. The grab grabs and lifts material in a single motion, thus simplifying processes in a wide range of industries. The use of a two-speed operating mechanism gives our grab cranes better working performance in terms of precision.
Wide range of applications Grab overhead cranes are specialized lifting equipment for bulk and granular materials. According to the different objects to be grabbed, different shapes of grab can be selected. Whether it is coarse materials in the construction industry or fine materials in the mining industry, these cranes can handle a wide range of materials, thus adapting to various applications.
Economically efficient Grab cranes are simple in structure, reliable in operation, high in productivity, and can be controlled automatically, semi-automatically and manually for easy operation. The electrical components are durable, safe and reliable to operate. While the initial investment in a grab bridge crane may not be low, the increased efficiency, reduced labour requirements, and minimized material spillage will result in significant cost savings over time.
High safety The design of these cranes prioritizes operator safety. Precise control mechanisms and automation features reduce the risk of accidents and ensure a safe working environment. Grab cranes are equipped with lift limit switches, low voltage protection, phase sequence protection, emergency stops, and overload protection devices to improve performance safety.
Applications for Grab Overhead Cranes
Mining In the mining industry, where large quantities of raw materials need to be transported continuously, Grab Overhead Cranes efficiently handle materials such as ores, coal and minerals, simplifying the extraction and transportation process.
Construction Sites At construction sites, grab cranes can lift sand and gravel, transport construction waste and increase productivity.
Waste Management Municipalities and waste management facilities utilize grab cranes for efficient waste disposal. Grab cranes accurately collect and transport bulk waste, contributing to a cleaner, more organized waste disposal process.
Ports and harbours In the shipping and logistics sector, grab overhead cranes are suitable for loading and unloading bulk cargo from ships. The versatility and high efficiency of grab bridge cranes make them indispensable in port operations, where speed and precision are essential.
Grab Bucket Overhead Crane Components
Mechanical part
Double main beams, welded box beams, arching by national standards.
The main welding seam adopts submerged arc automatic welding and non-destructive testing.
High-strength bolts are used to connect the end beams for easy transportation.
The trolley frame consists of box-type beams to form a frame structure.
Trolley part
The hoisting mechanism consists of amotor, brake, coupling, drive shaft, reducer, drum, pulley block, wire rope and other components.
The motor is a special YZR-type wire-wound motor for cranes, with insulation class F. The brake is a hydraulic actuator normally a closed type.
The drum adopts a casting drum, the deflection angle of the wire rope is <3.5°, and there are 3 turns and 2 turns of fixing rings at both ends of the drum.
The shaft head of the reel is equipped with a rotary limit switch to ensure the safe use of the hoist.
Cart running
The running mechanism of the big car consists of a motor, brake, coupling, reducer, transmission shaft,
Wheelset and other components.
The running mechanism is driven separately, and the electrical equipment is set on the bridge walkway.
The wheels are double rims to ensure the smooth running of the trolley.
Grab Bucket
Four-rope grabs, multi-valve grabs, electro-hydraulic grabs, straw grabs, timber grabs and many other types.
Electrical parts
Large car conductive safety sliding contact line or angle steel sliding contact line.
Flat cable is used for mobile power supply of running trolley.
Trolley power supply I-beam slideway or C-shaped steel slideway.
Safety sliding contact line with high conductivity, small voltage drop, high sliding speed of collector, smooth sliding, and overall beautiful.
Safety Protection
A railing handrail is installed.
Two horizontal crossbars are set up, and the bottom is equipped with a fence board with a height of 70mm.
Lighting is set under the bridge, and insulating rubber and door switches are set in the driver’s room.
Overload limiter.
Anti-collision devices and sound and light alarm devices are set.
Operation mode
Driver’s room manoeuvring, users can choose according to different needs.
The driver’s room has a wide field of vision, is spacious and bright, and operates comfortably.
The manoeuvring room has open type and closed type and can be divided into two forms of left or right side installation.
The door opening direction is divided into three forms: end opening, side opening and top entry.
