Electric Single Beam Overhead Crane

 

An electric single beam overhead crane consists of several critical components that work together to ensure safe and efficient material handling. Below is a detailed breakdown of each part and its function.

 

1. Main Load-Bearing Components

A. Single Girder (Main Bridge Beam)

The primary horizontal beam that spans the working area.

Typically made of welded steel box sections or rolled I-beams for strength.

Designed to resist bending and deflection under load.

B. End Trucks (End Carriages)

Wheeled structures at both ends of the bridge that allow movement along the runway.

Components:

Wheels (usually 4 per end truck, some with double-flanged design).

Drive motors (for powered travel).

Buffers/bumpers (shock absorption at travel limits).

2. Hoisting Mechanism

A. Electric Hoist

The powered lifting device (wire rope or chain type).

Key Parts:

Motor (geared for lifting).

Drum or chain sprocket (for rope/chain winding).

Brake system (holds load when stopped).

Hook block (with safety latch).

B. Trolley Assembly

Moves the hoist horizontally along the bridge girder.

Types:

Motorized trolley (electric drive for smooth movement).

Geared trolley (manual or motor-assisted).

 

3. Runway System

A. Runway Beams

Support the crane's movement, usually made of steel I-beams or box sections.

Can be top-running (crane rides on top) or underhung (suspended from ceiling).

B. Rails

Steel tracks (typically P-rail, A-55, or square bars) for smooth travel.

Must be aligned properly to prevent wheel wear.

4. Electrical & Control System

A. Power Supply

3-phase AC (380V/415V, 50Hz/60Hz) for motors.

Festoon system or cable reel for flexible power transmission.

B. Control Methods

Pendant control (wired handheld unit).

Radio remote control (wireless, up to 100m range).

Cabin control (for large or high-duty cranes).

C. Electrical Panel & Safety Devices

Overload limiter (prevents lifting beyond capacity).

Limit switches (stops crane at travel limits).

Emergency stop button (instant shutdown).

Undervoltage protection (prevents sudden restarts).

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5. Safety & Auxiliary Components

A. Safety Features

✔ Anti-collision system (for multiple cranes).
✔ Hook height limiter (prevents overwinding).
✔ Warning alarms & lights (audible/visual signals).

B. Optional Accessories

Magnetic lifter (for steel plates).

Crane scale (weighs loads while lifting).

Automatic positioning (for precision placement).

Explosion-proof components (for hazardous areas).

6. Structural Supports & Fasteners

Brackets & bolts (secure runway beams to building columns).

Rail clamps & fishplates (ensure smooth rail alignment).

Ladder & platform (for maintenance access).

 

Sketch

 

Main technical

 

Cost-Effective Solution

Lower initial investment compared to double girder cranes

Reduced installation and maintenance costs

Energy-efficient operation with electric power

Space-Saving Design

Compact structure maximizes usable floor space

Ideal for facilities with height restrictions

Minimal interference with other equipment

High Efficiency & Productivity

Faster load handling than manual alternatives

Smooth and precise load positioning

Reduces labor requirements and fatigue

Versatile Load Handling

Capacity range typically 1-20 tons (customizable higher)

Compatible with various attachments (hooks, magnets, grabs)

Adaptable to different work environments

Easy Operation & Maintenance

Simple control options (pendant/remote/cabin)

Minimal maintenance requirements

Modular design for easy component replacement

Reliable & Durable Performance

Robust steel construction for long service life

Suitable for medium-duty industrial applications

Stable operation with minimal vibration

Enhanced Safety Features

Built-in overload protection

Emergency stop functions

Limit switches for travel range control

Customization Flexibility

Adjustable span, lifting height and speeds

Options for special environments (explosion-proof, corrosion-resistant)

Can be automated for integration with production lines

 

1. Manufacturing Facilities

Moving raw materials and finished products

Positioning heavy components in assembly lines

Machine installation and maintenance

2. Warehousing & Logistics

Loading/unloading trucks and containers

Stacking and retrieving palletized goods

Order picking operations

3. Metal & Steel Processing

Handling coils, sheets and structural steel

Foundry and forging operations

Scrap metal handling

4. Automotive Industry

Engine and transmission handling

Chassis and body assembly

Spare parts distribution

5. Construction Material Handling

Precast concrete component installation

Building material distribution

Equipment maintenance

6. Power Generation Plants

Turbine and generator maintenance

Transformer handling

Boiler servicing

7. Paper & Printing Industry

Paper roll handling

Printing press maintenance

Finished product handling

8. Maintenance Workshops

Heavy equipment repair

Machinery overhauls

Spare parts handling

1. Design & Engineering
Requirement Analysis: Confirm load capacity, span, lift height, automation level, control mode, and safety features based on customer needs.

Structural Design: Design the single girder main beam, end carriages, trolley, and hoist assembly using CAD software.

Electrical & Control Design: Develop control system schematics including PLC programming, motor selection, VFDs, sensors, alarms, and safety interlocks.

Simulation & Validation: Use FEA (Finite Element Analysis) for structural integrity and dynamic simulation for motion control.

2. Material Procurement
Source high-quality steel (Q345B or equivalent) for main beam and components.

Acquire motors, hoists, VFDs, PLCs, limit switches, and alarm systems from trusted suppliers.

Ensure all components meet relevant certifications and standards (ISO, CE, GB).

3. Main Beam Fabrication
Cutting: Steel plates cut to size using CNC flame/plasma cutting machines.

Forming: Roll or shape plates into the I-beam or box girder profile.

Welding: Perform welding of flanges, web, and stiffeners following welding procedure specifications (WPS).

Heat Treatment: Stress relief if necessary to reduce welding deformation.

Machining: Drill holes for end carriage and trolley mounting; machine crane rails if integrated.

Inspection: Check weld quality (X-ray or ultrasonic), dimensions, and surface finish.

4. End Carriage & Trolley Assembly
Frame Fabrication: Cut and weld end carriage frames and trolley frames.

Wheel Assembly: Mount wheels and fit bearings; assemble drive motor and gearbox.

Installation: Attach wheels to frames and mount brakes and limit switches.

Testing: Static and dynamic tests on wheels and brakes for smooth rotation and load bearing.

5. Hoist Assembly
Assemble wire rope or chain hoist on the trolley.

Install hook block, safety latch, load limiter, and load sensors.

Connect hoist motor, gearbox, brake, and encoders.

Conduct functional tests on hoisting speed, lifting capacity, and braking.

6. Electrical Wiring & Control System
Install motor cables, control cables, and communication lines.

Mount PLC, VFDs, contactors, and safety relays in the control cabinet.

Wire limit switches, alarms, emergency stop, and sensors.

Program PLC with automated control logic, safety interlocks, and diagnostics.

7. Surface Treatment
Cleaning: Remove rust, oil, and debris from all steel parts.

Primer Coating: Apply anti-corrosion primer.

Final Paint: Spray high-durability industrial paint to protect against wear and corrosion.

Curing: Allow proper drying time to ensure finish quality.

8. Pre-Installation Testing
No-Load Tests: Run crane, trolley, and hoist without load to verify movement, speed, and control.

Load Test: Perform rated load test per standards to ensure lifting capacity and structural integrity.

Safety Device Check: Verify operation of overload limiter, limit switches, emergency stop, and alarms.

Automation Validation: Test automated sequences, positioning accuracy, and sensor feedback.

9. Packing & Shipping
Disassemble parts if necessary for transport.

Protect components with rust-proofing, padding, and secure packing.

Prepare documentation including user manuals, maintenance guides, and test certificates.

10. Installation & Commissioning (On-Site)
Reassemble crane components at customer site.

Align crane rails and secure runway structure.

Connect power and control wiring.

Calibrate sensors and test automated control functions.

Train operators and maintenance personnel.

Hand over documentation and certification.
 

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%.