Ld 10ton Electric Single Girder Bridge Crane

Core Components: Gearbox, Motor, Gear

Place of Origin: Henan, China

Warranty: 1 Year

Weight (KG): 10000 kg

Video outgoing-inspection: Provided

Machinery Test Report: Provided

Selling Units: Single item

Single package size: 600X300X300 cm

Single gross weight: 200.000 kg

I. Bridge Structure (The Main Traveling Frame)

This is the primary structure that spans the width of the bay.

Main Girder (Single Box/Girder): The primary load-bearing beam, typically a welded steel box section or rolled I-beam. It supports the trolley, hoist, and the entire lifted load.

End Trucks (End Carriages): Located at each end of the main girder. They house the wheels, motors, and drives for the bridge travel (long travel).

Bridge Wheels: Steel wheels that ride on the runway rails mounted on the building structure.

 

Bridge Drive Motor(s): Usually one motor per end truck (two total) for coordinated movement.

Bridge Drive Reduction Gearbox: Reduces motor speed to appropriate wheel speed.

Cross Shaft (Synchronizing Shaft): A long mechanical shaft connecting the two end trucks to ensure they turn at exactly the same rate, preventing crabbing (skewing) of the bridge.

II. Hoist Trolley Unit

The assembly that travels along the main girder and performs the actual lifting.

Electric Hoist: The integrated lifting device. For a 10-ton capacity, this is a robust unit containing:

Hoist Motor: Powers the lifting and lowering.

Hoist Gearbox: Reduces motor speed to create high lifting torque.

Drum or Sprocket: The steel drum for winding the wire rope or the sprocket for driving the load chain.

Brake: An automatic, spring-set, electrically-released brake to hold the load safely.

Wire Rope or Load Chain: The flexible medium that connects to the hook. Wire rope is more common for 10-ton capacity.

Hook Block: The assembly including the hook, sheaves (pulleys), and bearing.

Trolley Frame: The steel frame that carries the hoist and connects to the trolley drive.

Trolley Drive: The system that moves the hoist along the length of the main girder (cross travel).

Trolley Drive Motor

Trolley Reduction Gearbox

Trolley Wheels: Wheels that ride on the bottom flange of the main girder.

 

III. Electrical System

Main Power Supply: Sliding Cable System (Festoon) or Conductor Bar (Enclosed Rail) running parallel to the crane runway. Delivers 3-phase power to the crane.

Control System:

Cabin (Cab) or Pendant (Remote) Control:

Pendant Station: A hanging push-button station operated from the floor. Most common for single girder cranes.

Operator's Cab: A mounted cabin for the operator (less common on basic single girder cranes).

Control Panel/Electrical Cabinet: Houses contactors, relays, variable frequency drives (VFDs - for smooth starts/stops), overload protection, and PLC (if equipped).

Collectors (Current Collectors): Devices that pick up power from the main supply system (festoon or conductor bar).

Limit Switches: Critical safety devices that automatically cut off motion at the ends of travel.

Hoist Upper/Lower Limit Switch

Bridge End Limit Switches

Trolley End Limit Switches

IV. Safety Components

Overload Limiter: A mandatory safety device (often built into the hoist) that prevents lifting loads beyond 10-ton capacity (+ a small tolerance).

Bumpers/Rubber Buffers: Mounted on the end trucks to absorb impact if the crane over-travels.

Anti-Collision Devices: Sensors if multiple cranes operate on the same runway.

Warning Device: Horn or beacon to alert personnel.

Emergency Stop Button: Located on the pendant and/or in the cab.

V. Runway System (Often supplied by building contractor, but integral to crane function)

Runway Beams: Steel I-beams (often mounted to building columns) that support the crane rails.

Crane Rails: Steel rails (usually ASCE or flat-top rails) mounted on the runway beams for the bridge wheels to travel on.

Rail Clips/Clamps: Secure the rail to the runway beam.

6. RUNWAY SYSTEM (Not always supplied with crane)

6.1 Runway Beams

Steel I-beams (GB/T 706) mounted on building columns.

Must be precisely aligned and leveled.

6.2 Crane Rails

A45, A55, A65, A75, A100 steel rails (light crane rail series).

Rail Clips & Bolts: For securing rail to runway beam.

6.3 Rail End Stops/Bumpers

Mechanical stops at both ends of runway to prevent over-travel.

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7. OPERATOR INTERFACE OPTIONS

7.1 Standard Control

Pendant Push-button Station: Most common (90%+ of LD cranes).

7.2 Alternative Controls

Radio Remote Control: Infrared or 2.4GHz digital radio.

Cab Control: Enclosed operator's cab mounted on bridge (less common for LD).

SPECIAL NOTES ON LD STANDARD COMPONENTS

Standardization: All major components (hoist, end trucks) follow dimensional and performance standards for interchangeability.

Material Specifications: Steel is typically Q235B or Q345B per Chinese standards.

Duty Rating: Components selected for FEM 1M/2M (A3/A4) duty cycle - 150-300 starts per hour.

Environmental Rating: Standard IP44 for outdoor components, IP54 for hoist motor.

Wiring: Color-coded per Chinese electrical standards (Phase A-Yellow, B-Green, C-Red, Neutral-Blue, Ground-Yellow/Green).

Sketch

 

Main technical

 

Here are its key advantages, broken down into categories:

1. Cost-Effectiveness (The Biggest Advantage)

Lower Initial Investment: Compared to a double girder crane, the single girder design uses less steel and a simpler hoist mechanism, resulting in a significantly lower purchase price.

Reduced Infrastructure Cost: It is lighter, placing less stress on the building's runway system (rails and supporting columns). This can lead to savings in building construction or modification.

Lower Maintenance Costs: Simpler structure with fewer components means easier maintenance, fewer spare parts, and reduced downtime.

2. Structural & Design Efficiency

Compact and Lightweight Design: The single girder spans the runway, with the hoist and trolley running underneath it. This creates a lower headroom requirement, maximizing usable vertical space in your facility-a critical advantage in buildings with height limitations.

Ideal for Lower Capacity Applications: For a 10-ton capacity (which is at the higher end for single girder cranes), it provides a perfect, efficient solution without the over-engineering of a double girder crane.

Simplified Installation: The components are easier to handle and assemble on-site, reducing installation time and labor costs.

3. Operational Advantages

Ease of Operation: Typically operated via a pendant push-button station (or radio remote control), it is simple for operators to learn and use for precise load positioning.

Reliability and Duty Cycle: Modern LD cranes are designed for Class 2 (Light) to Class 3 (Moderate) duty cycles. They are perfectly suited for standard workshops, warehouses, assembly lines, and maintenance bays where constant, heavy cycling isn't required.

Flexibility: Can be easily fitted with various hook groups, grabs, or other attachments to handle different types of loads (e.g., coils, drums).

4. Standardization & Safety

Compliance with Standards: Reputable manufacturers build LD cranes to international standards (like FEM, ISO, or CMAA), ensuring a baseline of safety and performance.

Built-in Safety Features: Standard models include essential features like overload limit switches, end limit switches for travel motions, and emergency stop functions.

 

1. Core Components & Working Principle

Single Girder: One main beam (usually an I-beam or box girder) that spans the width of the bay.

End Trucks: Located at each end of the girder, equipped with wheels that run on elevated rails fixed to building columns or runway beams.

Hoist Trolley: The electric hoist (lifting unit) moves along the bottom flange of the single girder.

Control: Operated via pendant push-button station (floor-operated) or from an operator's cab. Can be integrated with radio remote control for flexibility and safety.

Working Principle: The bridge moves longitudinally along the runway rails (X-axis). The trolley with the hoist moves transversely along the girder (Y-axis). The hoist lifts/lowers the load (Z-axis). This provides 3D movement within the work area.

2. Typical Application Industries

Manufacturing & Assembly Plants: Handling raw materials (steel coils, metal sheets), moving components between workstations, loading/unloading machines.

Warehouses & Logistics Centers: Stacking and retrieving heavy pallets, loading/unloading trucks (with appropriate runway extension).

Metalworking & Fabrication Shops: Transporting metal plates, structural steel, and finished products.

Paper Mills: Handling large paper rolls.

Power Stations & Pump Houses: Lifting motors, turbines, transformers, and other heavy equipment for maintenance.

Automotive Industry: Moving engines, chassis, and large assemblies.

Aerospace: Handling smaller components and tooling.

Construction Material Supply: Handling bags of cement, bricks, or other bulk materials.

3. Specific Use Cases

Machine Loading/Unloading: Positioned over CNC machines, presses, or furnaces to feed raw billets or remove finished parts.

Maintenance Bays: Ideal for repair shops to lift heavy machinery parts, vehicles, or industrial equipment for servicing.

Production Line Feeding: Moving materials from a storage point to the start of a production line.

Finished Product Handling: Transporting completed items to painting, packaging, or shipping areas.

Storage and Retrieval: In steel yards or storage facilities, organizing and retrieving heavy items.

4. Key Advantages for These Applications

Cost-Effectiveness: Lower initial investment and installation costs compared to a double girder crane of similar capacity.

Space Efficiency: Requires less headroom due to the compact design where the hoist is underhung. This maximizes usable vertical space.

Ease of Installation & Maintenance: Simpler structure makes for quicker installation and easier maintenance.

Flexibility: Can be customized with various lifting heights, spans, and control methods (pendant, remote) to suit specific needs.

Reliability & Ease of Operation: Simple electrical and mechanical systems ensure reliable operation with standard training.

5. Important Considerations & Limitations

Duty Cycle: Best suited for light to moderate duty cycles (Classes FEM/ISO M3-M4). Not typically designed for continuous, heavy-duty, process-critical applications like steel mills.

Span Limitations: Generally recommended for spans up to ~25 meters. For longer spans, a double girder design is often required for greater rigidity and reduced deflection.

Load and Environment: Suitable for standard loads in typical industrial environments (warehouses, workshops). For very heavy, long, or high-precision lifts, or in harsh environments (foundries, outdoors), a double girder or more rugged crane may be needed.

Building Structure: The building's columns and foundation must be designed to support the crane runway load (crane weight + lifted load + dynamic forces). A structural analysis is mandatory before installation.

6. Configuration Options

Power Supply: Festoon system (common) or conductor bars for cleaner power delivery.

Control: Pendant control (standard), radio remote control (for better visibility and safety), or cabin control (for very frequent use over long spans).

Specialized Hoists: Can be fitted with explosion-proof, low-headroom, or dual-speed hoists.

Safety Devices: Includes overload limiters, end limiters for bridge and trolley travel, emergency stop, and warning lights/bells.

Conclusion

The 10-ton electric single girder bridge crane is an excellent general-purpose workhorse for a vast range of industries. Its primary value lies in providing reliable, efficient, and affordable heavy lifting capability over a rectangular area for applications that do not require extreme duty cycles, very long spans, or specialized lifting conditions. It bridges the gap between occasional jib crane or chain hoist use and the need for a full-capacity, high-duty cycle double girder system.

Always consult with a qualified crane manufacturer or engineer to ensure the crane specification matches your exact application, duty cycle, facility layout, and building structure.

 

Project: 10-Ton Electric Single Girder Bridge Crane Production Procedure

1. Design & Engineering

Customer Requirements Analysis: Confirm span (S), lifting height (H), duty class (FEM/ISO), voltage, and control mode.

Structural Design: CAD/CAE software is used to design the main girder, end carriages, and hoist trolley. Finite Element Analysis (FEA) ensures strength and deflection comply with standards (ISO, FEM, DIN, GB).

Mechanical & Electrical Design: Selection and integration of hoist unit, electric wire rope hoist (10-ton capacity), end carriage drive motors, wheels, and electrical control system.

Bill of Materials (BOM) Creation: Detailed list of all structural steel, mechanical, and electrical components.

Drawing Approval: All manufacturing and assembly drawings are finalized and approved.

2. Material Procurement & Inspection

Structural Steel: Purchase of certified steel plates (typically Q235B or equivalent), I-beams, and square tubes for the girder and end carriages.

Mechanical Parts: Sourcing of wheels, axles, bearings, gearboxes, couplings, and bolts. The electric wire rope hoist (10-ton) is often purchased as a certified, complete unit from a specialized supplier.

Electrical Components: Procurement of crane-duty motors, variable frequency drives (VFDs), limit switches, push button pendants/radio controls, festoon or conductor bar systems, and cable assemblies.

Inspection: All incoming materials are inspected for quality, dimensions, and material certificates.

3. Main Girder Fabrication

Cutting: Steel plates are cut to size using CNC plasma or flame cutting machines for precision.

Pre-assembly & Welding:

The web and flanges are assembled into a box-girder or I-beam configuration using jigs and fixtures.

Main longitudinal seams are welded using submerged arc welding (SAW) for high quality and penetration.

Stiffeners (diaphragms) are welded inside the girder at calculated intervals to prevent buckling.

Heat Treatment (if required): Stress relief annealing may be performed for large spans or heavy-duty cranes to minimize internal welding stresses.

Machining: The rail running surface (top flange) may be machined or ground to ensure flatness for smooth trolley movement.

Blasting & Priming: The completed girder is shot-blasted to SA 2.5 standard to remove rust and mill scale, then immediately coated with an anti-rust primer.

4. End Carriage Fabrication

Fabrication: Steel sections are cut, drilled, and welded to form the rigid end carriage frames.

Wheel Assembly: Wheels, axles, bearings, and gearboxes are assembled onto the end carriage frames. Pre-load adjustment is critical.

Drive Unit Installation: The drive motor(s) and gearbox are mounted. Typically, one end is driven, the other is idle.

Surface Preparation: End carriages are shot-blasted and primed.

5. Hoist Trolley Frame Fabrication

Frame Construction: A simple frame is fabricated to connect the purchased 10-ton electric hoist to the trolley wheels that run on the main girder flange.

Wheel Assembly: Trolley wheels, axles, and bearings are assembled. The frame is designed for easy attachment of the hoist.

6. Assembly (Pre-commissioning)

Girder & End Carriage Connection: The main girder is bolted or welded to the two end carriages using high-strength bolts. Alignment is meticulously checked to ensure the girder is square and the wheels are parallel.

Trolley & Hoist Mounting: The hoist trolley frame is placed on the main girder rail. The 10-ton electric wire rope hoist is securely bolted onto the trolley frame.

Electrical System Installation:

The festoon system or conductor bars are installed along the crane bridge.

All motors, limit switches (end limits for bridge and hoist, upper/lower limit for hook), and safety devices are wired to the main control panel.

The cabin or pendant control station is connected and tested for basic functions.

7. Painting & Finishing

Intermediate & Top Coat: After assembly, the entire crane structure receives intermediate and topcoat paint in the specified color. Critical surfaces (e.g., wheel treads, rail surfaces, electrical contact areas) are masked off.

Marking: Safety labels, capacity plate, and warning signs are applied.

8. Factory Acceptance Testing (FAT)

All tests are performed per relevant standards (e.g., ISO 9927-1).

Visual Inspection: Check dimensions, assembly quality, and painting.

No-Load Test: Run the bridge, trolley, and hoist in all directions to check for smooth operation, unusual noise, and limit switch functionality.

Static Load Test: Lift a test load of 125% of SWL (12.5 tons) to a low height. Hold for 10+ minutes. Check for permanent deflection, weld integrity, and braking performance.

Dynamic Load Test: Lift a test load of 110% of SWL (11 tons) and perform all operational motions (hoisting, traveling, braking). Verify speed, control accuracy, and safety device operation.

Electrical Inspection: Insulation resistance, grounding, and protective device checks.

9. Dismantling, Packing & Shipping

Dismantling: The crane is carefully disassembled into logical, manageable shipments (main girder, end carriages, hoist/trolley unit, electrical panels, rail, accessories).

Packing: All components are packaged for sea/land transport. Electrical items are weather-proofed. Lifting points are clearly marked.

Documentation: Comprehensive manuals (operation, maintenance, parts list), test reports, certificates (material, load test), and drawings are prepared for the customer.

10. Site Installation & Commissioning (By Technician)

Erection: Components are assembled on the customer's runway beams.

Alignment: Critical alignment of runway rails and crane bridge is performed.

Final Wiring: Connection of main power supply and final system checks.

Site Acceptance Test (SAT): A repeat of key FAT tests (no-load, static, dynamic) on the customer's premises to ensure proper installation.

Workshop view:

The company has installed an intelligent equipment management platform, and has installed 310 sets (sets) of handling and welding robots. After the completion of the plan, there will be more than 500 sets (sets), and the equipment networking rate will reach 95%. 32 welding lines have been put into use, 50 are planned to be installed, and the automation rate of the entire product line has reached 85%.