Bucket Overhead Crane

bucket overhead crane

Types of Bucket Overhead Cranes
a. Double-Girder Grab Bucket Cranes
Capacity: Typically 5–50 tons, with spans up to 35 meters.

Features:
Heavy-duty design for high-intensity operations (e.g., garbage handling, mining).
Equipped with automated grab systems for precise material control.
Example: The QD series double-girder crane supports capacities up to 800 tons and is used in hazardous environments.

b. Single-Girder Grab Cranes
Capacity: 1–35.5 tons, suitable for lighter bulk materials.
Advantages:
Cost-effective and compact, ideal for smaller facilities.
Can be paired with electric hoists (e.g., CD/MD models) for grab operations.

c. Monorail Grab Hoists
Capacity: 80 kg–3.2 tons, used for localized material handling.
Applications: Often integrated into production lines for granular or powdered materials.

• Capacity: 5-800/50ton
• Span length: 4-35m
• Lifting height: 3-50m
• Work duty: A4, A5, A6,A7
• Raged voltage: 220V~690V, 50-60Hz, 3ph AC
• Work environment temperature: -25℃～+50℃, relative humidity ≤85%
• Crane control mode: Floor control / Remote control / Cabin room

A bucket overhead crane (or grab bucket crane) consists of several key components that work together to efficiently handle bulk materials like coal, grain, sand, or waste. Below is a breakdown of its major components:

1. Main Structural Components
a. Bridge/Girder
Single Girder: Light-duty, cost-effective (used for capacities up to ~20 tons).
Double Girder: Heavy-duty, offers higher stability (for capacities up to 50+ tons).
Material: Typically steel (box-type or truss design) for durability.

b. End Trucks (End Carriages)
Equipped with wheels to move the crane along the runway rails.
Include drive motors (for movement) and braking systems.
c. Runway Beams & Rails
Support the crane's movement along the length of the workspace.
Made of high-strength steel to handle dynamic loads.

2. Lifting & Grab Mechanism
a. Hoist Unit
Electric Hoist: Common in light-duty cranes (e.g., CD/MD hoists).
Hydraulic Hoist: Used for heavy-duty applications (e.g., mining, ports).
Includes wire rope/drum or chain for lifting.

3. Power & Control Systems
a. Power Supply
Conductor Bars (Festoon Systems): Deliver electricity to the crane.
Cable Reels: Used for mobile or outdoor cranes.
b. Control System
Pendant Control: Handheld remote for manual operation.
Radio Remote Control: Wireless operation for safety and flexibility.
Cabin Control: Operator cabin for heavy-duty cranes.
c. Limit Switches & Sensors
Prevent overloading, overwinding, or collisions.

4. Safety & Auxiliary Components
a. Braking System
Mechanical brakes (for hoist/trolley) and emergency brakes.
b. Buffers & Bumpers
Absorb shock at the end of the runway.

c. Lighting & Alarms
Warning lights and sirens for hazardous zones.
d. Lubrication System
Automated or manual greasing for wheels, gears, and bearings.

5. Optional Add-Ons
Weighing System: Measures load weight in real-time.
Anti-Sway Technology: Stabilizes the grab bucket during movement.
Dustproof/Explosion-Proof Design: For hazardous environments (e.g., coal handling).

SKETCH

Bucket overhead cranes (also called grab bucket cranes) are specialized lifting systems designed for handling bulk materials. They offer unique benefits and are used across various industries.

Advantages of Bucket Overhead Cranes
✔ High Efficiency in Bulk Material Handling
Fast loading/unloading – The grab bucket can quickly scoop, lift, and dump materials, reducing manual labor.
Automated operation – Motorized grabs allow for remote or cabin-controlled operation, improving speed and precision.
✔ Versatility in Material Types
Can handle loose, granular, or powdered materials such as:
Coal, ore, gravel, sand
Grain, fertilizer, salt
Waste, scrap metal, wood chips
✔ Space-Saving & High Load Capacity
Operates overhead, freeing up floor space for other operations.
Heavy-duty models (double girder) can lift up to 50+ tons, making them ideal for mining and ports.
✔ Reduced Contamination & Spillage
Enclosed grab buckets minimize dust and material loss during transfer.
Useful in food processing (grain, sugar) and chemical industries where contamination must be avoided.
✔ Durability & Low Maintenance
Made with wear-resistant steel for abrasive materials (e.g., coal, slag).
Fewer moving parts compared to conveyor systems, reducing breakdowns.
✔ Safety & Control Features
Anti-sway technology prevents load swinging.
Overload protection and emergency brakes enhance safety.
Can be operated via remote control, reducing worker exposure to hazardous areas.

Common Applications of Bucket Overhead Cranes

🟢 Waste Management & Recycling

Garbage handling in waste-to-energy plants.

Scrap metal sorting in recycling facilities.

🟢 Mining & Construction

Coal, ore, and aggregate handling in mines and quarries.

Sand and gravel loading for construction sites.

🟢 Agriculture & Food Processing

Grain & fertilizer transport in silos and storage facilities.

Sugar, salt, and feed handling in food production plants.

🟢 Ports & Logistics

Loading/unloading ships with bulk cargo (e.g., coal, grain).

Stockyard management for raw material storage.

🟢 Steel & Foundry Industries

Slag handling in steel mills.

Scrap metal movement in foundries.

🟢 Power Plants

Coal handling for boilers.

Ash removal from furnaces.

1. Design & Engineering
Requirements Analysis: Determine load capacity, span, lifting height, and operating environment.

CAD Modeling: Create 3D designs and structural calculations (stress analysis, deflection, etc.).

Material Selection: Choose suitable casting materials (typically cast steel or ductile iron) for key components like girders, end carriages, and hooks.

Regulatory Compliance: Ensure designs meet standards (ISO, DIN, FEM, or ASME).

2. Pattern Making & Mold Preparation
Pattern Creation: Wood or metal patterns are made for casting molds.

Sand Mold Preparation:

Use resin-bonded sand or green sand for mold cavities.

Cores (for hollow sections) are prepared separately.

3. Casting Process
Melting & Pouring:

Metal (e.g., carbon steel, alloy steel) is melted in a furnace.

Molten metal is poured into molds under controlled conditions.

Cooling & Solidification: Allow the casting to cool slowly to avoid defects.

Shakeout & Cleaning: Remove sand molds, and clean castings (shot blasting, grinding).

4. Machining & Finishing
Rough Machining: Remove excess material (gates, risers).

Precision Machining: CNC machining for critical dimensions (bearing seats, bolt holes).

Surface Treatment: Painting, galvanizing, or anti-corrosion coatings.

5. Fabrication of Bridge Girder & End Carriages
Welding/Assembly:

Fabricate box girders or I-beams (if hybrid design).

Weld/bolt end carriages (with wheels for movement).

Stress Relief Heat Treatment (if needed) to reduce residual stresses.

6. Assembly of Crane Components
Hoist & Trolley Installation: Mount electric hoist or wire rope system.

Rail & Runway Setup: Install crane rails on supporting structure.

Electrical System Integration: Wire motors, controls, limit switches, and safety devices.

7. Testing & Quality Control
Dimensional Inspection: Verify tolerances per design specs.

Non-Destructive Testing (NDT):

Ultrasonic, magnetic particle, or dye penetrant testing for cracks.

Load Testing:

Static Load Test: 125% of rated capacity.

Dynamic Load Test: 110% of rated capacity with movements.

Functional Test: Check braking, lifting, and travel operations.

8. Painting & Corrosion Protection
Apply primer and corrosion-resistant paint.

Markings (capacity, serial number, warnings) as per standards.

9. Packaging & Delivery
Disassemble (if needed) for shipping.

Protect critical components during transit.

10. Installation & Commissioning (On-Site)
Reassemble on the customer's runway.

Final alignment and calibration.

Operator training and handover.

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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