Workshop Single Girder Overhead Bridge Crane
Products Description
Why Choose a Single Girder Crane for Your Workshop?
✔ Affordable – Lower upfront and operational costs.
✔ Compact – Works well in space-constrained areas.
✔ Flexible – Handles most light-to-medium lifting tasks.
✔ Easy to Maintain – Simple design reduces downtime.
Advantages of Single Girder Overhead Cranes:
✔ Cost-Effective – Cheaper than double girder cranes due to simpler design.
✔ Space-Saving – Requires less headroom, ideal for low-clearance workshops.
✔ Easy Installation – Lighter structure reduces support requirements.
✔ Suitable for Light to Medium Duty – Typically handles loads from 1 to 20 tons (can go higher with reinforced design).
✔ Low Maintenance – Fewer components reduce long-term upkeep costs.
Comparison: Single Girder vs. Double Girder
| Feature | Single Girder Crane | Double Girder Crane |
|---|---|---|
| Cost | Lower | Higher |
| Lifting Capacity | Up to 20T | Up to 100T+ |
| Span Length | Up to 30m | Up to 50m+ |
| Headroom | Requires Less | Needs More |
| Durability | Moderate | Heavy-Duty |
Lifting Capacity 1 – 20 tons (custom up to 50+ tons)
Span 5 – 30 meters
Lifting Height 3 – 30 meters
Lifting Speed 1 – 20 m/min (adjustable)
Trolley Speed 5 – 30 m/min
Crane Travel Speed 10 – 60 m/min
Power Supply 380V/415V, 50Hz (3-phase)
Duty Class FEM A3-A5 (Medium to Heavy Duty)
Pictures & Components
A single girder overhead bridge crane is a cost-effective and efficient lifting solution for workshops, warehouses, and light to medium industrial applications. Below is a detailed breakdown of its key components:
1. Main Components of a Single Girder Overhead Crane
(A) Bridge Girder (Single Box Girder)
The primary load-bearing beam (usually a welded steel box section).
Supports the trolley and hoist assembly.
Designed for spans typically up to 30 meters (longer spans may require a double girder).
(B) End Trucks (End Carriages)
Located at both ends of the girder.
Equipped with wheels for movement along the runway rails.
Can be motorized (electric travel) or manual (push-operated).
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(C) Hoist & Trolley Unit
Electric Chain Hoist (for light-duty, up to 10T) or Wire Rope Hoist (for heavier loads, up to 20T+).
The trolley moves side-to-side along the girder.
Common brands: CM, KONE, Demag, ABUS, or Chester.
(D) Runway System
Consists of runway beams (supported by building columns or freestanding structures).
Includes runway rails (usually PFC, I-beam, or square tracks) for smooth crane movement.
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(E) Drive Mechanism
Travel Motors (for bridge movement along the runway).
Trolley Motor (for transverse movement of the hoist).
Hoist Motor (for lifting/lowering).
(F) Control System
Pendant Control (wired or wireless) for operator use.
Radio Remote Control (optional for better mobility).
Variable Frequency Drive (VFD) for smooth acceleration/deceleration.
(G) Safety & Accessories
Limit Switches (to prevent over-travel).
Overload Protection (cuts power if load exceeds capacity).
Emergency Stop Button (for immediate shutdown).
Bumpers (to absorb impact at runway ends).
2. Optional Add-Ons
✔ Crane Cab (Operator Cabin) – For frequent heavy-duty use.
✔ Festoon System – Manages power/data cables along the crane.
✔ Anti-Sway System – Reduces load swing for precision lifting.
✔ Weighing System – Built-in load measurement.
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4. Common Workshop Applications
Machining Shops – Moving metal parts, engines.
Assembly Lines – Transporting components.
Warehouses – Loading/unloading pallets.
Maintenance Bays – Lifting heavy machinery.
5. Installation Considerations
Workshop Height – Single girder cranes need less headroom.
Runway Support – Must be strong enough (building columns or freestanding).
Power Supply – 3-phase electric is standard; manual cranes are an option.
Sketch
Main technical
Advantages
Single girder overhead cranes are widely preferred in workshops due to their cost-effectiveness, compact design, and efficiency. Here are the key advantages:
1. Lower Initial Cost
Simpler construction (single girder + under-slung hoist) reduces material and installation costs compared to double girder cranes.
Cheaper maintenance due to fewer components.
2. Space-Saving Design
Requires less headroom since the hoist runs below the girder (ideal for low-clearance workshops).
Lighter structure means less reinforcement needed for building columns.
3. Easy Installation & Relocation
Modular design allows quick assembly.
Freestanding runway options available if building support is insufficient.
4. Energy Efficient
Smaller motors consume less power than double girder cranes.
Smooth operation with Variable Frequency Drives (VFDs) for precise control.
5. Suitable for Light to Medium Duty
Typical capacity: 1 to 20 tons (can be customized for higher loads).
Ideal for frequent but not extreme heavy-duty lifting.
6. Low Maintenance
Fewer moving parts = less wear and tear.
Standardized hoist components (chain/wire rope) are easy to replace.
Application:
These cranes are versatile and used in various industries for material handling, assembly, and logistics. Common applications include:
1. Manufacturing & Machining Workshops
Moving metal sheets, engines, molds, and heavy tools.
Transporting machined parts between workstations.
2. Warehouses & Logistics
Loading/unloading pallets, containers, and packaged goods.
Stacking materials in storage facilities.
3. Automotive & Repair Shops
Lifting vehicle engines, transmissions, and chassis.
Assisting in assembly line operations.
4. Construction Material Handling
Moving steel beams, concrete blocks, and construction equipment.
5. Power Plants & Maintenance Facilities
Handling generators, turbines, and heavy maintenance parts.
6. Paper & Textile Industries
Transporting rolls of paper, fabric, or heavy coils.
Crane production procedure
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%.
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