Overview of ZOKECRANE Mechanical Grab Buckets
Manufactured by Henan Zoke Crane Co., Ltd., ZOKECRANE mechanical grabs are fabricated using high-strength alloy steel and wear-resistant steel plates (such as Hardox or NM400). Driven directly by crane wire rope systems, our product range includes two-rope clamshell grabs, four-rope clamshell grabs, orange peel multi-tine grabs, and single-rope touch-open grabs. Engineered in strict compliance with ISO, CE, and FEM standards, ZOKECRANE mechanical grab buckets cater to crane lifting capacities ranging from 3.2 tons to over 50 tons with bucket volumes up to 30+ cubic meters.
Key Technical Specifications & Parameters
| Technical Parameter | Mechanical Grab Bucket Specification |
|---|---|
| Product Type | Four-Rope Clamshell Grab / Two-Rope Clamshell Grab / Orange Peel Multi-Tine Grab / Touch-Open Single-Rope Grab |
| Bucket Volume Capacity | 0.5 m³ to 30.0+ m³ (Custom volume sizing according to material density) |
| Applicable Crane Capacity | 3.2 Tons to 50+ Tons (Single girder, double girder, or portal cranes) |
| Handling Material Density | 0.8 t/m³ to 3.0 t/m³ (Grain, coal, sand, gravel, iron ore, slag, scrap) |
| Manufacturing Steel Grade | High-tensile steel Q355B/Q355D, NM400 / Hardox wear-resistant lip plates |
| Scoop Edge Hardness | Quenched & tempered wear-resistant cutting edges (HB 360 – HB 450) |
| Sheave & Pin Construction | Induction-hardened alloy steel pins, cast steel sheaves with sealed bearings |
| Rope System Integration | Dual hoisting ropes + dual closing/opening ropes (4-rope configuration option) |
| Certifications & Standards | ISO 9001 Quality System, CE Certified, SGS Verified, GB/T 14420 Compliant |
Core Product Advantages & Engineering Features
- High Penetration & Closing Force: Optimized mechanical leverage geometry ensures deep penetration into compact bulk piles and tight bucket closure, minimizing material spillage during hoisting.
- Wear-Resistant Lip Edge Protection: Reinforced with NM400 or Hardox high-hardness steel cutting plates on bucket edges to withstand continuous abrasion from sharp ores and heavy aggregates.
- Pure Mechanical Reliability & Low Maintenance: Operates entirely through crane wire rope mechanics without complex hydraulic or electrical systems on the bucket, dramatically reducing maintenance downtime.
- Hardened Sheaves & Dust-Sealed Bearings: Features precision-machined wire rope sheaves with induction-hardened grooves and dust-sealed spherical bearings for smooth cable guidance under heavy dynamic tension.
Industrial Applications of Mechanical Grab Buckets
ZOKECRANE heavy-duty mechanical grab buckets are critical material handling attachments installed on cranes across diverse industrial sectors worldwide:
1. Port & Bulk Cargo Freight Terminals
Mounted on dockside portal cranes and ship unloaders for rapid unloading of coal, iron ore, fertilizer, grain, and clinker from bulk vessels.
2. Steel Mills & Foundry Processing Bays
Four-rope orange peel and clamshell grabs deployed on heavy double girder cranes for handling pig iron, scrap steel, slag, and limestone.
3. Thermal Power Plants & Cement Factories
Continuous heavy-duty handling of coal stock, clinker, gypsum, and raw crushed minerals in storage bunkers and hopper feeding stations.
4. Waste-to-Energy & Dredging Facilities
Heavy mechanical grabs utilized for municipal solid waste pit handling, river dredging, and underwater silt removal.
Frequently Asked Questions (Product FAQs)
What is the difference between a Two-Rope Grab and a Four-Rope Mechanical Grab?
Two-Rope Grabs utilize one rope for hoisting/holding and one rope for opening/closing, suitable for small-to-medium double-drum cranes. Four-Rope Grabs utilize two holding ropes and two closing ropes, providing double the rope strength, higher closing force, and superior balance for heavy-duty, high-capacity cranes (above 10 tons).
How do I select the correct grab bucket volume for my crane?
Grab volume is determined by the crane’s safe working load (SWL) and the bulk density of the material. The total weight of the empty grab bucket plus the weight of the material grabbed must not exceed the crane’s rated capacity: Crane Capacity ≥ Grab Tare Weight + (Volume × Bulk Density).
Can a mechanical grab bucket be operated on a single-hook crane?
Yes. We manufacture specialized Single-Rope Touch-Open Mechanical Grabs and radio remote control mechanical grabs that attach directly to standard single-hook overhead or gantry cranes without requiring additional hoisting drums.
How can material leakage be prevented when grabbing fine powder materials?
For fine powders like cement, alumina, or fine grain, ZOKECRANE supplies dust-tight closed clamshell grabs fitted with rubber-sealed lip joints or overlapping cutting edges that prevent fine particles from leaking during transit.
Export & Logistics FAQs for International Buyers
Which international markets does ZOKECRANE export mechanical grab buckets to?
ZOKECRANE heavy lifting equipment and crane attachments are exported globally, supplying port operators, steel plants, and mining contractors in Russia, Uzbekistan, the Philippines, Bangladesh, Australia, Qatar, Tanzania, Singapore, Saudi Arabia, Brazil, Nigeria, and many other global markets.
How are heavy mechanical grab buckets packaged for international ocean freight?
All machined pivot pins, wire rope sheaves, and grease points receive heavy anti-rust oil coatings and protective wrapping. Large grab bodies are secured on reinforced steel skids, vacuum-wrapped in moisture-proof plastic film, and loaded into 20ft/40ft Open-Top containers or flat-rack shipping frames.
What quality test reports and certifications accompany ZOKECRANE grab shipments?
Every shipment is supplied with a complete quality assurance dossier, including ISO 9001 compliance, European CE safety certificates, EN 10204 3.1 Material Test Reports (MTR) for wear plates, non-destructive weld inspection reports (UT/MT), load test certificates, and SGS third-party verification upon request.
What commercial shipping terms and manufacturing lead times do you offer?
We support standard international commercial terms including FOB, CIF, CFR, DDU, and DDP. Standard clamshell grab models (1.5 m³ to 5 m³) have fast manufacturing lead times of 15 to 20 business days; large volume or custom multi-tine orange peel grabs take 25 to 35 business days.
Does ZOKECRANE provide technical guidance for matching grabs to existing cranes?
Yes. Our engineering department evaluates your crane’s hoisting drum layout, drum pitch diameters, motor power ratings, and reeving configuration to design custom grab suspension plates, sheave arrangements, and rope lengths for seamless field installation.