25 Ton Overhead Crane

Introduction to 25 Ton Overhead Cranes

Dongqi Crane’s 25 ton overhead crane represents industrial-grade lifting power for heavy material handling applications. As a premier Chinese manufacturer with 30+ years of experience, we engineer robust bridge crane systems that deliver reliable performance in the most demanding work environments.

Advanced Technical Specifications of Dongqi 25 Ton Overhead Cranes

Dongqi Crane’s 25 ton overhead crane systems incorporate cutting-edge engineering innovations to meet the most demanding industrial lifting requirements. Below we expand on the technical specifications with deeper engineering insights:

1. Structural Engineering Excellence

• Girder Construction:
• Hybrid box girder design combining Q345B steel plates with internal reinforcement diaphragms
• Computer-optimized web stiffener patterns for maximum rigidity (FEA-verified)
• Cambered profile (1/1000 of span length) to compensate for deflection under full load
• End Truck System:
• Forged steel wheels with 55-60 HRC hardness
• Double-flange wheel design for enhanced runway tracking
• SKF/FAG premium tapered roller bearings (L10 rating > 50,000 hours)

2. Premium Hoisting Mechanism

• Wire Rope Assembly:
• 6×36 IWRC rotation-resistant ropes (DIN 3069 Grade 1960)
• Diamond-groove sheaves with hardened surfaces (HRC 45-50)
• Automatic lubrication system for extended rope life
• Drum Assembly:
• CNC-machined grooves for perfect rope alignment
• 3:1 safety factor on drum wall thickness
• Dual-encoder position monitoring system

3. Drive & Control Systems

• Travel Drive:
• AC frequency-controlled motors (IE3 efficiency class)
• Helical gear reducers (AGMA Class 12)
• Dynamic braking with regenerative power feedback
• Control Architecture:
• PLC-based smart controller with CANbus communication
• 16-bit resolution for smooth speed regulation
• 4-stage acceleration/deceleration profiles

4. Electrical Systems

• Power Distribution:
• IP55-rated enclosed conductor bar system
• Harmonic filters for clean power supply
• Surge protection devices (IEC 61643-11)
• Safety Circuits:
• Dual-channel safety relay (Category 4/PLe)
• Emergency stop with mechanical latching
• Ground fault monitoring system

5. Performance Metrics

• Speed Ranges:
• Hoisting: 0.5-8 m/min (VFD adjustable)
• Cross travel: 5-32 m/min
• Long travel: 10-63 m/min
• Positioning Accuracy:
• ±3mm with optional laser guidance
• 0.1m/min creep speed for final positioning

6. Environmental Adaptations

• Extreme Temperature Options:
• -40°C to +60°C operational range
• Heated/cooled gearbox systems
• Special grease formulations
• Corrosion Protection:
• ISO 12944 C5-M coating system
• Stainless steel fasteners (A4-80 grade)
• Cavity wax injection for internal spaces

7. Custom Engineering Capabilities

• Special Configurations:
• Multi-hoist tandem lifting systems
• Underhung bridge designs
• Monorail integration points
• Load Handling Attachments:
• Motorized rotating hooks
• C-hook assemblies
• Vacuum lifting systems

8. Compliance & Certification

• International Standards:
• FEM 1.001 Class 3m-4m
• CMAA Class D-E
• GOST 27584-88 (Russian certification available)
• Quality Documentation:
• Material traceability reports
• NDT inspection records (UT/MT/PT)
• Full load test videos

Dongqi’s 25 ton overhead cranes incorporate these advanced specifications while maintaining operational simplicity. Our engineering team can further customize any parameter to match your specific operational requirements and facility conditions.

Technical Support Available: Contact our engineers for:

• Structural load calculations
• Seismic analysis reports
• Energy consumption simulations
• Cycle time optimizations

This expanded technical specification demonstrates Dongqi Crane’s commitment to engineering excellence in heavy industrial lifting solutions. Each component is selected and designed to ensure maximum reliability, precision, and longevity in your operations.

Industrial Applications of Dongqi 25 Ton Overhead Cranes: Sector-Specific Solutions

1. Heavy Steel Manufacturing & Processing

Integrated Steel Mills

• Blast Furnace Operations: Handling refractory bricks during relining (precisely positioning 18-22 ton brick packages)
• Continuous Casting: Manipulating tundishes and mold assemblies with ±5mm positioning accuracy
• Hot Strip Mills: Coil handling with specially-designed C-hooks that prevent surface damage at 600°C+

Special Steel Production

• Alloy Handling: Lifting vacuum induction melting crucibles with 25-ton molten metal capacity
• Plate Processing: Flipping 20m-long steel plates for double-sided machining
• Forging Press Support: Positioning massive die blocks with integrated heating systems

2. Energy & Power Generation

Conventional Power Plants

• Turbine Hall Operations:
• Rotor extraction with dual-hoist synchronized lifting
• Casing halves alignment during maintenance
• Boiler Maintenance:
• Superheater bundle replacement
• Economizer tube bank handling

Renewable Energy

• Wind Turbine Manufacturing:
• Nacelle assembly with 360° rotating spreader beams
• Blade root handling during hub mounting
• Hydroelectric Plants:
• Generator rotor removal
• Guide vane mechanism servicing

3. Heavy Machinery & Equipment Manufacturing

Construction Equipment

• Excavator Assembly:
• Positioning 22-ton upper structures
• Boom and arm subassembly handling
• Crane Manufacturing:
• Counterweight installation
• Slewing ring mounting

Marine Engineering

• Ship Engine Installation:
• Main engine lowering into hull with laser guidance
• Stern tube bearing placement
• Propeller Handling:
• 25-ton bronze propellers positioning
• Blade angle adjustment during mounting

4. Mining & Mineral Processing

Mineral Extraction

• Crusher Maintenance:
• Mantle and concave liner replacement
• Eccentric assembly handling
• Mill Relining:
• 20-ton grinding mill shell sections
• Trommel screen installation

Material Handling

• Ship Loading/Unloading:
• Grab bucket operations for bulk minerals
• Direct transfer to processing lines
• Stockyard Management:
• Stacking copper cathodes
• Iron ore pellet handling

5. Transportation Infrastructure

Railway Manufacturing

• Locomotive Assembly:
• Power pack installation
• Bogie frame handling
• Freight Car Production:
• Tank car shell rotation
• Hopper car assembly

Bridge Construction

• Prefabrication Yards:
• Girder flipping operations
• Segment handling for box girder bridges
• Launching Operations:
• Balanced cantilever segment installation
• Stay cable anchorage positioning

6. Specialized Industrial Applications

Aerospace Components

• Rocket Manufacturing:
• Fuel tank section handling
• Engine nozzle positioning
• Aircraft Production:
• Wing spar handling
• Landing gear assembly

Nuclear Industry

• Containment Building:
• Steam generator mockup handling
• Reactor vessel internals transfer
• Waste Management:
• Cast iron cask positioning
• Shielded door installation

Application-Specific Features:

• Temperature Adaptations:
• Insulated operator cabs for steel mills
• Heat-resistant electrical components
• Hazardous Area Options:
• ATEX-rated components for explosive atmospheres
• Intrinsically safe controls
• Precision Add-ons:
• Laser alignment systems
• Load orientation indicators
• Anti-sway software packages

Dongqi’s engineering team conducts comprehensive application analysis including:

1. Cycle Time Studies – Optimizing hook paths for maximum productivity
2. Fatigue Analysis – Predicting component life under specific duty cycles
3. Process Integration – Synchronizing crane movements with production flow
4. Ergonomic Evaluation – Reducing operator fatigue in repetitive tasks

Each 25-ton crane solution includes:

• Application-specific load attachments
• Customized control interfaces
• Duty-cycle matched components
• Process-optimized speed profiles

Technical Consultation Available: Our application engineers can:

• Conduct on-site process audits
• Develop customized lifting procedures
• Simulate operations using 3D modeling
• Train operators on application-specific techniques

Technical Advantages

Structural Integrity

• Finite Element Analysis (FEA) optimized design
• Welded steel construction with X-ray inspection
• ISO 12488-1 compliance for runway tolerances

Performance Features

• Variable frequency drive (VFD) for smooth acceleration
• Anti-sway control system (±10mm positioning accuracy)
• Dual braking systems (mechanical + electromagnetic)

Safety Systems

• Overload cut-off protection
• Emergency stop circuit (Category 3, PLd)
• Redundant limit switches
• Load moment indicator (optional)

Dongqi Quality Assurance

• Manufacturing Standards:
• ISO 9001:2015 certified
• GB/T 14405-2011 compliance
• CE certification available
• Testing Protocol:
• 125% static load test
• 110% dynamic load test
• 10,000-cycle endurance testing
• Warranty: 18 months standard (extendable)

Project Support Services

Custom Engineering

• Facility load analysis
• Seismic reinforcement design
• Special environmental adaptations

Installation & Commissioning

• Certified installation teams
• Laser-aligned runway systems
• Complete operational testing

After-Sales Support

• Global spare parts network
• Preventive maintenance programs
• Operator training packages

Why Choose Dongqi for Your 25 Ton Overhead Crane?

✅ Proven Track Record: 500+ heavy crane installations worldwide
✅ Cost Efficiency: 20-30% savings versus European brands
✅ Technical Expertise: In-house R&D center with 45 engineers
✅ Complete Solutions: From design to after-sales service

Get Your 25 Ton Overhead Crane Solution

Contact Dongqi Crane today for:

• Free facility assessment
• Customized crane design
• Competitive quotation
• Project timeline planning

Dongqi Crane – Your Trusted Partner for Heavy Lifting Solutions

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