50 ton Bridge Crane for Assembly and Maintenance

Yuantai offers 50 ton overhead cranes with a double girder design for smoother lifting and operation, which will still meet your needs even for large span applications. We offer a wide selection of 50 ton overhead cranes to meet your needs from general material handling to hazardous environment applications.

Design Specifications

All the structures and accessories of 50 tons overhead cranes offered by Yuantai are subjected to stringent quality tests to ensure their compliance with international standards. The design criteria for the components of this crane are as follows:

1. Structural Girder Assembly

The main girder is fabricated from Q355B high‑strength structural steel (equivalent to ISO S355, DIN ST52 or ASTM A572 Gr 50) to achieve an optimal balance of weight and stiffness. All longitudinal and transverse welds are executed per ISO 15614‑1 and AWS D1.1, ensuring consistent penetration and minimal distortion. To guarantee weld integrity, fillet welds undergo 100% magnetic‑particle or penetrant testing, and butt joints receive ultrasonic inspection. Under maximum rated load, the girder's mid‑span deflection does not exceed L/700, preserving both safety margins and crane geometry.

2. End Carriage and Drive System

Each end carriage employs a direct‑drive gearbox mounted to a hollow‑tube steel housing. This layout eliminates chains or belts, boosting transmission efficiency and reducing maintenance intervals. The wheels are machined from alloy steel and heat‑treated to achieve a fine microstructure, providing excellent wear resistance and fatigue life. Sealed taper‑roller bearings are grease‑lubricated for life and require inspection only at annual service intervals. The drive can be specified with either a two‑speed geared motor or a variable‑frequency drive for infinitely variable travel speed.

3. Hoist and Trolley Mechanism

The double‑girder hoist trolley rides on precision‑profile rails welded to the girder's lower flange. By splitting the hoist across two girders, we lower the headroom needed for the hook by approximately 200 mm compared to a conventional double‑girder crane. The hoisting motor, brake and gearbox are mounted in a compact assembly directly under the trolley beams for ideal load distribution. Load chain or wire rope passes over self‑aligning sheaves, offering reliable, snag‑free reeving and permitting hook positioning accuracy within ± 10 millimetres.

4. Gear Motor and Braking

Due to the different operating environments of different working conditions, we offer motors with IP55-IP67 protection class for different applications. Thermistor sensors embedded in the windings trigger an alarm and automatic shutdown if temperatures exceed safe limits. Braking is provided by a spring‑applied, electro‑magnetic unit. A manual release lever allows lowering of the load if power is lost, ensuring safe, controlled descent under any circumstance.

5. Electrical Control and Power Distribution

Due to the different operating environments of different working conditions, we offer motors with IP55-IP67 protection class for different applications.

6. Festoon Cable Management

The crane's power and control cables follow a double‑line festoon system suspended from a galvanized C‑track attached to the runway beam. One conductor group carries hoist power and control signals, while the second powers the trolley travel and pendant or radio‑control receiver. No‑weld “claw” brackets firmly clamp the track to the beam without penetrating the flange, simplifying retrofit installations and complying with most plant mottos against welding on existing structures.

7. Safety and Monitoring

A suite of interlocks protects both personnel and equipment. Load‑cell overload limit switches prevent lifting beyond rated capacity, cutting hoist power if a set threshold is exceeded. Mechanical end‑stops and limit switches halt hoisting at upper and lower extremes. Similar overspeed and overtravel switches guard the long‑ and cross‑travel motions. An optional crane monitoring system can log usage data, vibration levels and overload events, feeding them to a central dashboard or local LED load indicator in the cabin.

8. Anti‑Corrosion Coatings

Prior to painting, all steel surfaces are shot‑blasted to ISO 8501‑1 SA2.5, achieving a surface cleanliness of Level II per ISO 8502‑3 and a roughness profile of 50–70 μm (ISO 8503). The three‑layer coating system begins with a zinc‑rich epoxy primer, followed by an epoxy mid‑coat and finished with a polyurethane topcoat. All painters carrying out these tasks hold at least NACE Level II or FROSIO Level II certification, ensuring coating consistency and adhesion.

Yuantai 50 ton Overhead Crane Model Options

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Technical Specifications of Double Girder Overhead Crane

The following table provides the parameters of 50 tons double girder overhead travelling crane about universal type, if you have other parameter requirements, you can also contact us, we can customize 50 tons overhead travelling crane for you according to your needs.

50 Ton Overhead Crane Components

A 50 ton crane is built from interdependent subsystems—structural girders, hoist and trolley mechanisms, and control electronics—that together deliver safe, precise lifting.

Structural Components

• Double Girders
  Fabricated from high‑strength steel, girders span the runway and carry the trolley and hoist. They are reinforced to limit deflection under heavy load .

• End Trucks and Wheels
  Mounted at each end of the girders, end trucks house the wheel assemblies and drive motors, ensuring smooth bridge travel along the runway rails .

Mechanical Components

• Wire Rope Hoist
  Comprises the hoisting motor, gearbox, drum, and hook block. Designed for continuous duty, it manages the vertical lifting of up to 50 tons .

• Trolley Assembly
  Moves the hoist laterally across the bridge. Guided by precision rails and driven by VVVF‑controlled motors, it enables accurate load positioning .

Electrical Components

• Control System
  Includes pendants, wireless remotes, or cabin consoles. Interfaces with motor starters, variable frequency drives, and safety relays for coordinated motion control .

• Safety Devices
  Overload sensors, limit switches, and emergency‑stop buttons continuously monitor operation and can halt crane movement if unsafe conditions are detected .

50 Ton Overhead Crane Power Requirements

Delivering power to lift and traverse 50 ton loads requires robust electrical infrastructure and precise sizing of motors and feeders.

Main Power Supply

• Voltage and Frequency
  Standard supply is 380 V AC, 50 Hz, 3‑phase; 400 V or 460 V variants are also available .

Motor Specifications

• Hoist Motor
  Typically rated 100–200 kW to achieve required torque and speed for heavy loads. Starting currents can peak at 6–8× full‑load current .

• Bridge & Trolley Motors
  Rated 15–30 kW each, these motors handle horizontal motions. Power factor correction may be added to optimize efficiency .

Power Distribution and Feeder Systems

• Feeder Sizing
  Calculated by summing 100% of the largest motor’s FLA, 50% of the next largest, plus a 25% safety margin for inrush currents .

• Traveling Power Options
  Choice of festoon systems, conductor bars, or cable reels based on runway length and layout .

How to Request a Quote

Contact us for a detailed consultation and custom quote:

• Email:[email protected]
• Phone:+86 15003854290

How to get quotation?

Send us your RFQ including the parameters above, we will reply our quotation accordingly.