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Grab bucket overhead crane is a special type of double girder bridge crane. The QZ grab bucket overhead crane is for efficiently moving large-volume loose or irregular materials with less manpower. It's suitable for handling bulk materials in coal yards, scrap processing lines, waste treatment plants. etc.
Different from general-purpose hoists, it has a specialized grab mechanism integrated into the crane's structure. It uses a grab bucket to handle various bulk materials such as scrap metal, garbage, wood, sand, grain, coal slag, silt, wine lees, and more. The crane mainly consists of double main beams, end beams, trolley, grab bucket, running mechanism, electrical components, and cabin. The grab device is crucial for grabbing and placing goods.
Common grab types are single-rope, double-rope, and electric grabs. They can grip, hold, and release materials at the designated place. Since 2006, Henan Dafang Crane has been producing these cranes and supplying them to over 30 countries' steel mills, ports, power plants, and recycling centers. Each crane meets CE certification and ISO quality management standards.
Selecting the right grab type for the material is crucial when specifying this crane. According to the size and shape of the lifting material, users can choose between flexible Double-flap Clamshell Grab or Electric Hydraulic Multi-petal Grab.
A two-jaw design for loose granular materials like sand, gravel, coal fines etc. The cutting edges are overlay-welded with wear-resistant steel and a multi-layer seal prevents leakage. Filling degree reaches 95-100% at rated density (0.5-2.5 t/m³), affecting cycle productivity. These grabs weigh up to 3 tons. They are standard for single-girder handling 2-10 t and available on double-girder up to 320 tons.
A 4–8 jaw configuration for irregular, large-piece materials such as scrap steel, demolition waste, logs and bulky solid waste. The jaws adjust to piece shapes, important for inconsistent material sizes. Jaw plates are made of high tensile wear-resistant plate. Clients often use them on double-girder for high-density materials (1.8–3.0 t/m³). These grabs, weighing up to 11 tons, can handle materials of 3.2-30 tons.
| Model | Load Capacity (t) | Grab Volume (m³) | Material Density (t/m³) | Grab Weight (t) | Span (m) |
| Single Girder Double-flap Grab EOT Crane | 2–20 | 1–3 | 0.5–1.8 | 2.1–3.3 | 4.5–28.5 |
| Single Girder Multi-petal Grab EOT Crane | 5–20 | 1–3 | 0.5–1.8 | 2.5–4.0 | 5–28.5 |
| Double Girder Double-flap Grab EOT Crane | 5–320 | 2–5 | 1.0–2.5 | 3.9–6.4 | 15–30 |
| Double Girder Multi-petal Grab EOT Crane | 5–320 | 4–8 | 1.8–3.0 | 6.5–12 | 7.5–31.5 |
Lifting speed: 5 m/min (standard). Span range: 4.5–31.5 m depending on configuration. Custom lifting heights, duty classes, and power supply specifications available on request.
Customers deploy the QZ series of Grab Bucket Overhead Cranes across a range of bulk-material-intensive environments:
Typical scenario (indicative): A 50 MW biomass power plant with a 24-hour fuel intake requirement specifies a double-girder clamshell crane, 10 t capacity, 20 m span, A6 duty class, with PLC auto-cycle for unattended night operation. This configuration eliminates one shift operator position while maintaining required throughput.
| Lifting capacity | t | 10t | ||||||||
| Span | m | 10.5 | 13.5 | 16.5 | 19.5 | 22.5 | 25.5 | 28.5 | 31.5 | |
| Lifting height | m | 18 | ||||||||
| Work duty | A6 | |||||||||
| Speed | Hoisting | m/min | 40 | |||||||
| Trolley traveling | 45.9 | |||||||||
| Crane traveling | 86.4 | 89 | ||||||||
| Max. wheel loading | kN | 113 | 121 | 131 | 142 | 152 | 162 | 172 | 180 | |
| Crane rail recommended | 43kg/m or QU70 recommended | |||||||||
| Power supply | 3-Phase A.C.50HZ 380V | |||||||||
| Grab | Model | U | 127 | 123 | 124 | 119 | 120 | 115 | 116 |
| Type | Light | Medium | Heavy | Extra Heavy | |||||
| Volume | m^ | 5 | 3 | 2 | 1.5 | ||||
| Material density | t/m³ | ≤1 | ＞1~1.7 | ＞1.7~2.5 | ＞2.5~3.3 | ||||
| Weight | Kg | 4800 | 4803 | 4866 | 4850 | 4913 | 4730 | 4793 | |
| Main dimension | D | 3900 | 3430 | 3430 | 3220 | 3220 | 2920 | 2920 | |
| Ba | 2700 | 2400 | 2400 | 2200 | 2200 | 1960 | 1960 | ||
| Bb | 2060 | 1754 | 1754 | 1528 | 1528 | 1416 | 1416 | ||
| Bh | 3990 | 3747 | 3747 | 3640 | 3640 | 3490 | 3490 | ||
Routine Check
Emphasize grab-specific parts-examine jaw plate abrasion, hinge pin tightness, and grab opening and closing ease. Also, check chain or rope abrasion, track cleanliness, brake system sensitivity, and electrical wiring to ensure all bridge crane parts are free from looseness or damage.
Regular Maintenance
Lubricate grab hinges, rotating crane parts, and tighten bolts weekly; calibrate limiters and adjust transmission tension monthly; inspect grab jaw plates for deformation, metal structures for corrosion, eliminate rust, and repaint quarterly; arrange annual overall testing by specialists, focusing on grab drive mechanisms and key crane components.
Essential Precautions
During upkeep, cut off power and put up warning signs, especially when servicing grab hydraulic or pneumatic systems. Keep thorough records, replacing worn grab components with qualified spares without delay.
Henan Dafang Crane has designed and manufactured overhead and gantry cranes since 2006. The company supplies grab bucket EOT cranes, double girder overhead cranes, gantry cranes, electric hoists, and crane components to clients in more than 30 countries. Engineering design, manufacturing, and after-sales support are integrated at the Henan production facility. Contact the Dafang engineering team for grab type selection, structural calculations, or a customized configuration proposal.
Dafang supplies high quality overhead cranes, gantry cranes, jib cranes, electric hoists and crane spare parts etc. You can fill out the form below, and we will contact you as soon as possible
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