Looking for a versatile and efficient lifting solution for your workshop, warehouse, or storage yard? The gantry crane with electric hoist might be your perfect match. This widely used crane combines robust gantry structure with the flexibility of an electric hoist.
Engineered for superior performance in demanding environments, this double girder gantry crane features a robust U-shaped design with vertical legs. This configuration creates an unobstructed passage for oversized materials to move freely between the span and cantilever sections. It is ideally suited for specialized applications, including soil handling in subway construction projects, with customizable trolley designs available.
Operational efficiency is enhanced by multi-speed control, allowing smooth and precise adjustment across 2-3 speed grades for both lifting and travel motions. All manufacturing and design processes adhere to GB standards, and the equipment is certified under ISO and CE requirements.
Let's dive deep into its standards, covering scope, types, key parameters, and safety essentials.
This applies to general-purpose gantry cranes using an electric hoist as the lifting mechanism. Special-purpose cranes can also refer to this standard.
⚠️ Not Suitable For:
Explosive, flammable, or corrosive atmospheres.
Lifting molten metal, flammable, or explosive materials.
Gantry cranes with electric hoists come in various designs to fit different needs:
By Structure: Full Gantry Crane / Semi-Gantry Crane.
By Lifting Attachment: Hook / Grab / Electromagnet.
By Main Girder: Single Girder / Double Girder.
By Operation: Pendant Control (Follow/Non-Follow) / Radio Remote.
| Parameter Category | Specification Range |
|---|---|
| Operating Speed | |
| • Lifting Speed | 0.8 - 25 m/min (Standard series) |
| • Trolley Travelling Speed (Max.) - Floor-Controlled: ≤ 40 m/min - Pendant/Remote-Controlled: ≤ 45 - 50 m/min - Cab-Operated: ≤ 63 m/min |
Up to 40 - 63 m/min (Depends on control mode) |
| • Gantry Travelling Speed (Max.) | Up to 45, 50, or 63 m/min |
| Rated Capacity (Preferred Series) | 2 - 200 t (Covers two standard series) |
| Span (Preferred Series) | 7 - 50 m (Covers two standard series) |
| Lifting Height (Preferred Series) | |
| • With Hook | 4 - 32 m |
| • With Grab or Electromagnet | 8 - 20 m |
Duty Class: Ranges from A2 to A7.
Cantilever Length: Effective length typically ≤ Span/3 (i.e., L1 ≤ S/3).
Standard Series: Rated capacity, span, and lifting height follow preferred number series.
Power Supply: 3-Phase AC, 50/60Hz, 220V-660V. Allowable voltage fluctuation: ±10%.
Temperature: -25°C to +40°C.
Humidity: Can temporarily reach 100% at avg. +25°C; ≤50% at +40°C.
Wind Pressure:
Working: ≤150 Pa (Inland, ~Beaufort 5) / ≤250 Pa (Coastal, ~Beaufort 6).
Non-Working (Max): 800 Pa (~Beaufort 10).
Design must comply with GB/T 3811-2008 & JB/T 5663-2008.
The electric hoist must meet JB/T 9008.1 or JB/T 5317.
Main Girder Camber: ≥ 0.7S/1000.
Cantilever Upward Deflection: ≥ 0.7L/350.
Horizontal Stiffness (Single Girder): Mid-span deformation ≤ S/2000.
Grab Fill Rate: ≥ 90%.
Lifting Height: ≥ 97% of nominal value.
Safety is paramount. Key points include:
Load Limiter: Must be installed per GB/T 6067.1.
Buffers & End Stops: Required for all travel motions.
Limit Switches: Essential for long travel; required for trolley travel if speed ≥25m/min.
Emergency Stop, Electrical Protections: Short-circuit, under-voltage, phase sequence protection are mandatory.
Control Voltage: ≤50V for pendant control.
Interlocks: Doors to cab and bridge must have safety interlocks.
Grounding: Ground connection resistance ≤4Ω. Cab and all electrical enclosures must be properly grounded.
Cab Dimensions: Min. internal height 1.8m, safe distance from lifting attachment ≥0.4m.
Wind & Anti-Derailment Devices: Wind speed alarms (for H≥12m), anti-skew devices (for S≥40m), and reliable windproofing/anchor devices are required.
Rail Joints (Double Girder): Ideally welded. Otherwise, gaps and misalignment are strictly limited (d≤1mm, e≤2mm, f≤1mm).
Span Tolerance (ΔS):
S<10m: ΔS = ±6mm
10m≤S≤26m: ΔS = ±8mm
S>26m: ΔS = ±10mm
Key Mechanical Features:
Main Girder: Fabricated from double welded steel boxes, with beam deflection complying with GB, DIN, and FEM standards.
Construction Materials: Utilizes high-grade steel (Q235B, Q345B/Q345E) for exceptional structural integrity.
Trolley Rail: Manufactured from 16 Mn high-tensile, hot-rolled flat steel for extended service life.
Protective Coating: A 120μm thick triple-layer epoxy zinc-rich paint system provides outstanding corrosion resistance, durability, and a superior finish.
Robust Frame: The main girder and end beams are welded as a single, rigid unit to guarantee structural precision and strength.
Secure End Carriages: Fitted with anti-friction bearings, buffer blocks, derailment guards, and choice of flat or double rim wheels.
Safe Access: A dedicated maintenance walkway with patterned flooring and a 1050mm handrail is installed along one main girder.
Surface Preparation: All steel components undergo pre-treatment—including sandblasting, primer spraying, and drying—to remove internal stress, enhance paint adhesion, and ensure long-term anti-corrosion performance.
Design & Compliance:
This gantry crane is developed in strict accordance with Chinese national standards, including GB/T3811-2008 (design rules), GB/T 5905-2011 (testing), GB/T 14406-2011 (general purpose), and GB/T10183.1-2010 (tolerances).
The gantry crane with electric hoist is a powerhouse for material handling in standard environments. Understanding its standards—from A2-A7 duty class and environmental limits to critical safety interlocks and span tolerances—is key to selecting, operating, and maintaining it safely and efficiently.
Need a reliable lifting solution? Ensure your supplier's equipment meets all these specifications.
This professional-grade U-type double girder gantry crane is engineered to excel in environments demanding high-strength material handling and uninterrupted workflow. Its robust construction and versatile design provide reliable performance across multiple sectors.
Primary operational settings include:
Heavy-Duty Logistics Hubs: Streamlining the movement of bulky goods, machinery, and palletized cargo in large-scale open storage yards and distribution centers, ensuring efficient and rapid transfer.
Port and Intermodal Terminals: Facilitating the swift loading and unloading of shipping containers and heavy cargo from vessels and transport vehicles, minimizing vessel turnaround times.
Railway Freight and Cargo Yards: Handling diverse freight with precision in railway facilities, where its ability to manage heavy loads is critical for maintaining scheduling efficiency.
Construction Material Stockpiles: Ideal for managing bulk materials like steel, pipes, and pre-cast concrete components in outdoor storage areas, thanks to its resilience in various weather conditions.
Specialized Project Sites: Customized configurations make it perfect for demanding projects such as subway construction, where it effectively manages excavation materials and heavy structural elements.
The crane’s generous span, U-shaped leg clearance for oversized items, and steady multi-speed control make it the optimal solution for sites with extensive coverage needs and high-frequency lifting cycles.
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