MHZ Single Girder Grab Gantry Crane
Product Introduction
The MHZ Type Single-Girder Grab Gantry Crane (also known as MHZ Type Grab Gantry Crane or Electric Hoist Grab Gantry Crane) is a bulk material handling crane built on the MH Type Electric Hoist Gantry Crane platform, with a grab mechanism added. Two electric hoists are rigidly coupled in parallel via a specially fabricated steel frame, enabling the grab to pick up and transfer bulk materials such as coal, sand & gravel, mineral powder, and grain. It is a medium-to-small capacity rail-mounted crane for general-purpose applications.
The MHZ Type is a semi-customized machine with a lifting capacity of 1 to 32 tons and spans from 9 to 30 meters. It is widely used in bulk material handling scenarios including breweries (spent grain), mines and quarries, port terminals, railway freight yards, coal storage yards, and waste transfer stations. Different grab types (e.g., shell-type, multi-rope, timber grabs) can be fitted based on the material characteristics.
Product Specifications
- Product Name: MHZ Type Single-Girder Grab Gantry Crane (Grab Gantry Crane)
- Model & Specification: MHZ Type, lifting capacity 1–32 tons (standard options: 1/2/3/5/10/16/20/32t)
- Place of Origin: Xinxiang, Henan (Kelude Heavy Industry)
- Non-Standard Customization: Span, lifting height, cantilever length, and grab type are all customizable
- Hoisting Mechanism: Two CD1 Type Electric Hoists (rigidly coupled via a specially fabricated steel frame) + grab
- Applicable Span: 9–30 meters (non-standard spans available upon request)
Product Photos
The photos above show actual MHZ Type Grab Gantry Cranes. The specially fabricated steel frame couples the two electric hoists in parallel, enabling efficient bulk material grabbing and loading/unloading.
Product Features
- Dedicated Grab Design: A specially fabricated steel frame rigidly couples two electric hoists in parallel, jointly driving grab opening/closing and hoisting/lowering. This delivers high grabbing force and reliable open/close action, ideal for continuous bulk material operations.
- Multiple Grab Options: Different grabs can be fitted based on material characteristics — shell-type grabs (coal/sand & gravel/ore), multi-shell grabs (scrap steel/rocks/waste), and timber grabs (logs). One machine handles multiple applications.
- Cost-Effective, Durable Structure: Built on the proven MH Type gantry platform with the grab mechanism added, the main girder and outriggers use mature designs. This costs 40%–50% less than a dedicated grab bridge crane.
- Flexible Semi-Customization: Lifting capacity, span, lifting height, and grab volume are all customizable to match the duty cycle. Grab capacity is matched to the lifting capacity to ensure full-load grabbing without overloading.
- Multiple Operation Modes: Pendant control, wireless remote control, and operator cabin — all three modes are available and can be mixed. The cabin offers a wide field of view for precise grab positioning.
- Built for Harsh Environments: Operating ambient temperature range of -20°C to +40°C, suitable for all-weather outdoor bulk material yards. Optional dustproof and anti-corrosion protection available.
Working Principle
The MHZ Type Grab Gantry Crane adds a grab mechanism to the standard MH Type gantry structure. Two CD1 Type Electric Hoists are coupled in parallel via a specially fabricated steel frame — one controls grab hoisting/lowering, and the other controls grab opening/closing. In operation, the grab is first lowered onto the material pile, the grab shells close to pick up material, the load is hoisted and moved to the discharge point via the crane bridge/trolley travel, and the shells then open to discharge the load.
Grabbing Cycle: Lower (with open grab) → Close grab to pick up material → Hoist → Move crane bridge/trolley to discharge point → Open grab to discharge → Return. A complete cycle typically takes 20–45 seconds (depending on material and lifting height), delivering far higher continuous throughput than manual loading/unloading.
Crane Bridge / Trolley Travel: The crane bridge travels longitudinally along ground rails (20m/min, with a 30m/min fast option available), while the electric hoist trolley traverses laterally along the lower flange of the main girder I-beam (20m/min), covering the entire stockyard working area.
Product Structure
The MHZ Type Single-Girder Grab Gantry Crane consists of the following core components:
Main Girder Assembly: Single box-type welded structure, fabricated from Q355B steel plate using submerged arc automatic welding. Compared to the standard MH Type main girder, the grab-type main girder is strength-checked against the combined effect of grab closing force plus material weight.
Leg System: Standard straight legs or lattice-type outriggers, made of Q235B or Q355B steel. The lower end of each outrigger is welded to a ground beam, which is secured to the concrete foundation with anchor bolts. External cantilevers can be customized as required.
Bridge Travel Mechanism: Motor + gearbox/reducer + driven/trailing wheel blocks. Wheel material is ZG310-570 or 65Mn, with the tread surface induction-hardened to HRC40~50. Individually driven for reliable operation on outdoor bulk material yard rails.
Grab Mechanism (Core): Two CD1 Type Electric Hoists are rigidly coupled in parallel via a specially fabricated steel frame — one hoist controls grab hoisting/lowering, and the other controls grab opening/closing. Hoist lifting speeds are 8m/min (≤5t), 7m/min (10t), and 3.5m/min (16t). Grab volume is matched to the lifting capacity.
Grab: Selected based on material type — shell-type grabs (coal/sand & gravel/ore, 0.3–3m³ volume), multi-shell grabs (scrap steel/rocks, 4–8 shells), and timber grabs (logs). Grab material is Q345B or wear-resistant steel NM360.
Electrical Control System: Dual-hoist independent/combined control panel, including main circuit breaker, contactors, thermal overload relays, and limit switches. Control voltage is AC 36V safety voltage. Power is supplied via enclosed conductor rail or cable reel.
Technical Parameters
General Technical Parameters for MHZ Type Single-Girder Grab Gantry Crane
| Parameter Item | MHZ typeParameter |
| Lifting Capacity | 1~32 t(Common1/2/3/5/10/16/20/32t) |
| Span | 9~30 m(9/11/13/17/19.5/22/25.5/30mCommon) |
| Lifting Height | 6~30 m(6/9/12/18/24/30mCommon) |
| Work Duty / Classification | A3 / M3 |
| Lifting Speed | ≤5t:8 m/min;10t:7 m/min;16t:3.5 m/min |
| Trolley Travel Speed | 20 m/min(Quick Speed 30 m/min) |
| Bridge Travel Speed | 20 m/min(Quick Lead Time30 m/min) |
| Power Supply | Three-Phase AC 380V 50Hz(Customizable for ExportVoltage) |
| Operation Mode | Wired Pendant / Wireless remote control / Operator Cabin(Mix-and-Match) |
| Working EnvironmentTemperature | -20℃~+40℃ |
| Grab (grab bucket)Type | Clamshell / Multi-Jaw / WoodGrab (grab bucket)(Matched by Material) |
Product Drawings
The drawing above shows the reference dimensions for the MHZ Type Grab Gantry Crane. Final dimensions are determined based on the lifting capacity, span, and grab bucket volume required for your specific application.
Application Scenarios
- Coal Yards & Power Plants: Ideal for coal unloading, stacking, loading, and feeding. The grab bucket delivers far higher continuous throughput than manual handling and is built for round-the-clock operation.
- Port Terminals: Handles ship loading/unloading and yard transfer of bulk cargo (ore, aggregates, grain, fertilizer). Can be integrated with belt conveyors for a fully continuous operation line.
- Mines & Quarries: Designed for grabbing and transferring ore, mineral powder, and waste rock. Wear-resistant grab buckets are available for high-abrasion conditions.
- Distilleries & Breweries: Suitable for grabbing and moving light bulk materials such as spent grain and grain. Food-grade grab buckets available on request.
- Waste Treatment Facilities: Handles grabbing, transfer, and feeding of municipal and construction waste. Multi-shell grabs provide high gripping force with minimal spillage.
Crane Selection Guide
Light Bulk Material Applications: MHZ Type, 1–5t capacity, 9–17m span, 0.3–1m³ grab bucket volume. Suitable for small coal yards, distilleries, and grain warehouses. Reference price: ¥40,000–100,000.
Medium Bulk Material Applications: MHZ Type, 5–16t capacity, 17–25.5m span, 1–2m³ grab bucket volume. Suitable for port terminals, mines, and coal yards. Grab bucket type and material density must be confirmed. Reference price: ¥100,000–220,000.
Heavy Bulk Material Applications: MHZ Type, 16–32t capacity, 25.5–30m span, 2–3m³ grab bucket volume. Suitable for large ports, power plants, and steel mill raw material yards. Foundation load capacity and wind protection measures must be confirmed. Reference price: ¥220,000–500,000.
Selection Notes: Please provide the lifting capacity, span, material type (determines grab bucket design), and grab frequency (cycles/hour). The Kelude Heavy Industry technical team will provide a free crane selection proposal and foundation drawing.
Operating Instructions
Pre-Operation Checks: Verify the grab bucket open/close mechanism moves freely, wire ropes show no broken wires or strands, brake clearance is correct, limit switches are responsive and reliable, and the remote control/handle functions properly.
Grab Bucket Operation: The grab bucket must be in the open position during lowering. Close the shells upon contacting the material, confirm the bucket is full, then hoist. Move to the discharge point and open the shells slowly to dump. Never allow the grab bucket to strike hard objects or attempt overload grabs, as this can cause wire rope fracture.
Shutdown Procedure: After operations, lower the grab bucket to the ground (never leave it suspended). Park the crane bridge in the designated anchoring zone and disconnect the main power supply. When parked outdoors, engage the rail clamps to prevent movement in high winds.
Maintenance: Inspect grab bucket blade wear and wire rope condition monthly. Check brake friction linings and open/close mechanism synchronization quarterly. Inspect hinge pin wear on the grab bucket every six months. Conduct a full annual safety inspection, including load test, crane rail settlement measurement, and grounding resistance testing.
Why Choose Kelude Heavy Industry
Professional Grab System Matching: Integrated design with twin hoists mounted on a parallel steel frame plus the grab bucket open/close mechanism ensures reliable, coordinated hoisting and opening/closing action. Grab bucket volume is precisely calculated based on material density to prevent overload or under-filling.
Multi-Industry Application Experience: Proven track record across coal, aggregates, mineral powder, grain, spent grain, waste, and other bulk materials. We recommend the optimal grab bucket type and material based on your specific material characteristics.
Full-Process Custom Service: Free on-site survey → grab selection → foundation design → manufacturing → installation & commissioning → operator training → after-sales support. Phone response within hours, on-site within 48 hours.
Service & Support
Kelude Heavy Industry provides full life-cycle support for the MHZ Type Single-Girder Grab Gantry Crane: free site survey, grab bucket selection, steel structure manufacturing, installation & commissioning, operator training, and annual maintenance. For more models, technical parameters, and quotation, call 13903802779 or contact our online support team — we respond within 24 hours.
Need an MHZ Type Grab Gantry Crane selection proposal or quotation?
Contact the Kelude Heavy Industry sales & technical team anytime — free design proposal and technical consultation.
FAQ
Q: What is the difference between the MHZ Type Grab Gantry Crane and the MH Type standard Gantry Crane?
A: The MHZ is a bulk-material-specific variant of the MH type. It uses a specially designed steel frame to mount two electric hoists in parallel on the standard MH single-girder gantry structure, enabling grab bucket operation for bulk material handling. The MH type uses a single hoist with a hook for handling unit loads. The core advantage of the MHZ is its far higher continuous bulk handling efficiency compared to manual labor.
Q: Which national standards does the MHZ Type Grab Gantry Crane comply with?
A: The MHZ Type Grab Gantry Crane is designed to JB/T 5663-2008 "Electric Hoist Gantry Crane" standard. The grab mechanism references the JB/T 9004 "Grab Crane" standard. The hoisting mechanism complies with JB/T 9008.1 "Wire Rope Electric Hoist." Installation supervision and inspection follow TSG Q7014, and safety protection is configured per GB/T 6067 "Safety Regulations for Lifting Appliances."
Q: How do I select the right grab bucket type for the MHZ Type Grab Gantry Crane?
A: Grab selection mainly depends on the material: for loose granular materials like coal, sand, and gravel, use a shell-type grab (clamshell) for high grab ratio and efficiency; for scrap steel, rocks, and waste, use a multi-jaw grab for strong gripping force and minimal spillage; for logs and timber, use a dedicated wood grab. When selecting, you'll need to provide material density and particle size — the Kelude Heavy Industry technical team will match you with the optimal grab solution.
