Ohc Overhead Crane

Types of Overhead Cranes (OHC)

Single Girder Overhead Crane

Uses one main beam (I-beam or box girder).

Lower cost, suitable for light to medium loads (1–20 tons).

Ideal for workshops and warehouses.

Double Girder Overhead Crane

Uses two parallel girders for higher capacity (20–500+ tons).

Higher lifting height, better for heavy industries.

Gantry Crane

Similar to OHC but runs on ground-mounted rails (no building support needed).

Used in shipyards, outdoor storage, and construction.

Monorail Crane

Moves along a single fixed track (linear movement only).

Common in assembly lines and production units.

Jib Crane

Has a rotating arm for localized lifting.

Used in workshops for precise material handling.

 

Comparison: Where to Use OHC vs. Other Cranes?

Scenario	Overhead Crane (OHC)	Gantry Crane	Jib Crane
Best For	Indoor heavy lifting	Outdoor/mobile lifting	Localized, small-scale lifting
Load Capacity	1–500+ tons	5–1000+ tons	0.5–20 tons
Mobility	Fixed runway	Moves on ground rails	Fixed or rotating
Space Needed	Requires runway beams	Needs ground space	Minimal space
Cost	Moderate to high	High	Low

 

Core Components：Bearing, Gearbox, Motor, Pump

Place of Origin：Henan, China

Warranty：1 Year

Weight (KG)：2000 kg

Video outgoing-inspection：Provided

Machinery Test Report：Provided

Design：Double beam

Effectiveness：high efficiency

Operating speed：High speed operation

Stability：Anti-swing function

Color：Optional

Power Source：110V/220V/230V/380V/440V,customized

Span：7.5-31.5m

 

 

An Overhead Crane (OHC) consists of mechanical, electrical, and structural components working together for safe and efficient lifting. Below is a detailed breakdown of all major parts:

 

1. Structural Components

A. Bridge Girder (Main Load-Bearing Structure)

Single Girder – One main beam (I-beam or box-section) for lighter loads (1–20 tons).

Double Girder – Two parallel beams for heavy-duty lifting (20–500+ tons).

B. End Trucks (End Carriages)

Wheeled frames at each end of the girder.

Include wheels, bearings, motors (for powered cranes), and brakes.

Allow the crane to move along the runway rails.

C. Runway System

Runway Beams – Steel beams (top-running or underhung) supporting the crane.

Runway Rails – Steel tracks where the crane moves (usually ASCE, DIN, or I-beam rails).

Brackets & Supports – Fix rails to the building structure or freestanding columns.

2. Lifting & Movement Components

A. Hoist (Lifting Mechanism)

Electric Chain Hoist – For light to medium loads (1–10 tons).

Wire Rope Hoist – For heavy-duty lifting (5–100+ tons).

Includes:

Motor (for lifting/lowering).

Gearbox (speed reduction).

Drum or Sprocket (for rope/chain winding).

Brake (safety lock).

B. Trolley (Hoist Carrier)

Moves the hoist horizontally along the girder.

Can be:

Manual push trolley (for light loads).

Motorized trolley (electric drive for precision).

C. Drive Mechanism (For Crane Movement)

Bridge Drives – Motors & gearboxes for moving the entire crane along the runway.

Trolley Drives – Motors for moving the trolley along the girder.

Wheels & Axles – Steel wheels (often with flanges) for smooth travel.

3. Electrical & Control Components

A. Power Supply System

Festoon System – Cable management for power & signals (sliding or trolley-based).

Conductor Bars – Alternative to festoon for cleaner power transmission.

B. Control System

Pendant Control – Hanging push-button station (wired).

Radio Remote Control – Wireless operation (up to 100m range).

Cabin Control – Operator cab for large cranes.

C. Safety Devices

Limit Switches – Prevent over-travel (bridge, trolley, hoist).

Overload Protector – Blocks lifting beyond safe capacity.

Emergency Stop (E-Stop) – Instantly cuts power.

Anti-Collision Sensors – For multi-crane setups.

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4. Optional & Accessory Components

Crane Cabin – Enclosed operator station for heavy-duty cranes.

Weighing System – Load cell for weight measurement.

Variable Frequency Drive (VFD) – Smooth acceleration/deceleration.

Magnetic or Vacuum Lifters – For handling steel, glass, etc.

Explosion-Proof Components – For hazardous environments.

5. Maintenance & Inspection Checklist

✔ Daily Checks – Wire ropes, hooks, brakes, limit switches.
✔ Weekly/Monthly – Lubrication, wheel alignment, electrical connections.
✔ Annual Inspection – Structural integrity, load testing.

 

SKETCH

Main technical

 

 

Overhead cranes offer numerous benefits for industrial material handling, making them a preferred choice in many sectors:

1. High Load Capacity & Efficiency

Can lift from 1 ton to 500+ tons (double girder models).

Faster and more efficient than forklifts for heavy loads.

2. Space Optimization

Operates above floor level, freeing up workspace.

No ground obstructions (unlike gantry or jib cranes).

3. Precise & Smooth Handling

Variable Frequency Drives (VFDs) enable controlled acceleration/deceleration.

Ideal for assembly lines, precision manufacturing, and tight spaces.

4. Durability & Long Service Life

Built with high-grade steel for heavy-duty operations.

Requires less maintenance compared to mobile cranes.

5. Safety & Reduced Labor Risks

Minimizes manual lifting injuries.

Equipped with overload protection, limit switches, and emergency stops.

6. Customizable for Various Needs

Can be fitted with magnets, grabs, or vacuum lifters.

Available in explosion-proof, high-temperature, and corrosion-resistant variants.

7. Cost-Effective in the Long Run

Lower operational costs than forklifts for heavy loads.

Energy-efficient electric models available.

 

Overhead cranes are used across industries for lifting, moving, and positioning heavy materials. Key sectors include:

1. Manufacturing & Automotive

Moving engine blocks, presses, and assembly line components.

Used in automotive plants, steel fabrication, and machinery production.

2. Warehousing & Logistics

Loading/unloading containers, pallets, and bulk goods.

Common in distribution centers, ports, and freight terminals.

3. Construction & Heavy Engineering

Handling steel beams, concrete panels, and pre-cast structures.

Used in bridge construction and large-scale infrastructure projects.

4. Power Plants & Energy Sector

Lifting turbines, generators, and transformers during maintenance.

Critical in nuclear, hydro, and thermal power plants.

5. Mining & Metal Processing

Transporting raw ores, molten metal, and heavy machinery.

Used in foundries, smelters, and mining operations.

6. Shipbuilding & Aerospace

Moving ship hulls, aircraft wings, and large structural parts.

Essential in dry docks and aerospace manufacturing.

7. Paper, Cement & Chemical Industries

Handling heavy rolls of paper, cement bags, and chemical containers.

Often customized with corrosion-resistant coatings.

 

 

1. Order Confirmation & Design
Review customer requirements (capacity, span, lifting height, environment).

Engineering team develops detailed design drawings and 3D models based on FEM/DIN standards.

Confirm technical specs, materials, and delivery schedule with the client.

Obtain client approval on final design.

2. Material Procurement
Source high-quality steel plates, profiles, motors, electrical components, and accessories.

Verify material certifications (e.g., steel grade, motor specs).

Inspect and store raw materials properly to prevent damage.

3. Steel Fabrication
Cut, shape, and machine steel plates and profiles for main girders, end carriages, and trolley frames using CNC machines.

Weld components following strict welding procedures (e.g., MIG/MAG welding) with certified welders.

Perform non-destructive testing (NDT) such as ultrasonic or magnetic particle inspection on welds to ensure quality.

4. Main Beam Assembly
Assemble double girders with cross beams and stiffeners.

Align and weld main beam sections precisely.

Conduct dimensional checks to meet design tolerances.

Apply surface treatment (sandblasting and primer coating).

5. Component Assembly
Assemble end carriages, trolley frame, hoisting mechanism (hook block, drum, wire rope), motors, brakes, and gearboxes.

Fit mechanical components and test moving parts for smooth operation.

6. Surface Treatment & Painting
Clean all steel surfaces (blast cleaning).

Apply high-quality industrial coatings or paint systems, typically anti-corrosion primer plus finish paint (usually RAL colors).

Allow proper drying and curing to ensure durability.

7. Electrical Wiring & Control System Installation
Install motors, control panels, and electrical wiring according to electrical schematics.

Mount control devices such as pendant controls, limit switches, alarms, and sensors.

Integrate PLC or VFD drives as required.

Conduct insulation resistance and continuity tests.

8. Initial Testing & Quality Inspection
Perform no-load test runs for lifting, trolley travel, and bridge travel.

Verify all safety devices (limit switches, overload protection, emergency stop).

Inspect welds, alignments, and surface finish.

Document test results and corrections.

9. Load Testing
Perform load test according to FEM/ISO standards with a test load (usually 125% of rated capacity).

Observe crane behavior under load: lifting, lowering, travel motions, brakes.

Record results and certify load test completion.

10. Final Inspection & Packing
Conduct a final comprehensive inspection.

Package crane components securely for transport (especially if shipped in parts).

Prepare all documentation: manuals, certifications, test reports.

11. Delivery & Installation
Transport crane to customer site.

Assist or supervise installation and commissioning.

Provide operator training and maintenance guidance.

12. After-Sales Support
Offer maintenance, spare parts supply, and technical support.

Follow up on customer satisfaction and crane performance.

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%.