Overhead Eot Crane

 

An Overhead Electric Overhead Traveling (EOT) Crane is a robust and efficient material-handling solution widely used in industries such as manufacturing, construction, steel plants, warehousing, and more. Designed to lift, transport, and position heavy loads with precision and ease, it is an indispensable tool for streamlining operations and enhancing productivity.

The Overhead EOT cranes are capable of handling loads from a few tons to hundreds of tons, meeting a wide range of application needs. Equipped with electric hoists and trolleys, they enable smooth and efficient lifting and moving. Made of high-strength materials, they ensure long service life and reliability in demanding industrial environments. Available in single-beam, double-beam or gantry configurations to meet specific operational needs and space constraints.

For industries seeking to enhance their operational capabilities, the Overhead EOT Crane is the ultimate solution to maximize efficiency and productivity.Our Overhead EOT Cranes are engineered to meet the highest standards of performance, reliability, and safety.

Core Components:Engine, Bearing, Gearbox

Place of Origin: China

Warranty:1 Year

Video outgoing-inspection: Provided

Machinery Test Report: Provided

Power supply: 220-690V, 50/60HZ, 3P

Control Voltage: 24/36/48V

Working duty: A3-A6

Color: Yellow

Application: indoor & outdoor

Crane travelling speed: 0-30m/min

Working temperature: -25°-45°

Control method: Remote Control or Push Button

 

 

1.Main beam

The main beam of an Overhead Electric Overhead Traveling (EOT) Crane is a critical structural component responsible for supporting the load and providing a path for the trolley or hoist to move.

The main beam of an overhead electric overhead traveling (EOT) crane is usually made of high-strength steel to carry the required loads. Two parallel beams are used. Commonly used for heavy loads and larger spans.

The main beam of an overhead electric overhead traveling (EOT) crane provides a strong and stable path for the trolley or crane to move. Supports the weight of the hoisted load, trolley, crane and its own weight. Ensures smooth operation under dynamic conditions such as acceleration, deceleration and braking.The length of the beam is determined by the crane's operational width.

The load capacity of the main beam of an overhead electric overhead travelling (EOT) crane must be designed to handle the maximum static and dynamic loads within safe limits.

 

Lifting System

Motor:The motor of a lifting system in an Overhead Electric Overhead Traveling (EOT) Crane is a critical component designed to lift and lower heavy loads with precision and safety.

The reducer of the lifting system in an Overhead EOT (Electric Overhead Traveling) crane plays a critical role in the mechanical power transmission system. It is responsible for reducing the speed of the motor to a suitable level while increasing the torque, ensuring smooth and controlled lifting and lowering of loads.

3) Drum:The drum of a lifting system in an overhead EOT (Electric Overhead Traveling) crane is a critical component responsible for winding and unwinding the wire rope, which facilitates the lifting and lowering of loads.

4) Wire rope: Wire rope is a critical component in the lifting system of an Overhead EOT (Electric Overhead Traveling) crane. It is responsible for carrying the load and is typically subjected to a variety of forces, including tension, bending, and wear. The design and selection of wire rope for EOT cranes depend on several factors such as the crane's capacity, the type of load being lifted, the environment, and the frequency of usage.

5) Pulley block: A pulley block in the lifting system of an overhead EOT (Electric Overhead Traveling) crane is a critical component that facilitates the movement and lifting of heavy loads.

6) Lifting device: The lifting device of an overhead EOT (Electric Overhead Traveling) crane plays a critical role in the crane's ability to lift, lower, and move loads.

 

 

3.End carriage

1) The end carriage of an Overhead EOT (Electric Overhead Traveling) Crane is a critical component that supports and allows the crane to move along the runway beams. It connects to the main bridge girder(s) and ensures smooth and controlled horizontal movement across the length of the crane's operating area.

2)Functionality

Horizontal Movement:The end carriage allows the crane to travel along the runway beams, providing coverage over the entire work area.

Load Distribution:Properly distributes the load weight across the wheels and runway beams.

Structural Stability:Maintains stability and ensures the alignment of the crane bridge with the runway system.

Design Considerations

Capacity and Duty Class:Designed based on the crane's rated load capacity and usage frequency (light, medium, heavy-duty).

Runway Rail Alignment:Precision alignment is crucial to prevent uneven wear or derailment.

Durability:Built to withstand wear, environmental conditions, and high operational cycles.

4.Crane travelling mechanism

1) Working principle

Electric Motor Drives the Wheels: The crane traveling mechanism is powered by electric motors. These motors are typically either AC or DC motors, which are mounted on the crane structure and are connected to the drive wheels through a gear system.

2) Functions of the crane operating mechanism

The crane traveling mechanism of an Overhead EOT (Electric Overhead Traveling) crane is responsible for the horizontal movement of the crane along the length of the runway, typically in a factory or industrial setting. It allows the crane to move from one end of the building or structure to another to transport loads to various work areas.

 

5.Trolley travelling mechanism

1) Structural composition

Trolley frame: The trolley frame is the primary structural component of the trolley. It is typically made from steel or welded sections of steel and supports the other components of the trolley.

Wheel set: The trolley wheels are mounted to the trolley frame and run along the rail system of the crane.

Drive device: The trolley drive mechanism includes an electric motor and a gearbox, which are usually mounted on the trolley frame. The motor provides the power to move the trolley along the bridge, while the gearbox adjusts the speed and torque.

2) Function of the trolley operating mechanism

Horizontal Movement: The trolley mechanism allows the hoist (the lifting device) to move horizontally along the bridge of the crane, enabling precise positioning of the load over the work area.

Load Handling: Facilitates the transfer of the load to different sections of the workspace, aiding in efficient material handling.

Flexibility and Reach: Provides the crane with the ability to cover the entire span of the crane's runway, making it versatile for various lifting operations.

6.Crane wheel

1) Function of wheels

Mobility: The wheels allow the crane's bridge or trolley to travel back and forth along the runway or rail system.

Load Distribution: They help distribute the weight evenly across the tracks and crane structure.

Precision: The quality of the wheels and their alignment ensures precise positioning of the crane for lifting operations.

2) Design requirements

Design: The wheels are usually flanged or grooved to fit into the rail or track, ensuring that they stay aligned during operation. They often have a convex profile to minimize wear and tear and ensure smooth operation.

7.Crane Hook

1) The crane hook of an overhead EOT (Electric Overhead Traveling) crane is a crucial component used to lift and move heavy loads. It's designed to be strong and durable, capable of supporting significant weights.

2) The hook is used to attach the load to the crane for lifting and transporting it across the designated path.It is usually connected to the hoist mechanism, which is part of the crane's lifting system.Typically made from high-strength steel to withstand heavy loads and prevent bending or failure.Often shaped like a "C" or a simple hook with a safety latch to prevent the load from slipping off.Equipped with latches or locking mechanisms to ensure the load stays secure during movement.

Motor

1) An Overhead EOT (Electric Overhead Traveling) Crane is a type of crane used for lifting and moving heavy loads across a horizontal plane, often in industrial environments such as factories, warehouses, and shipyards. The motor is a critical component of an EOT crane, playing a key role in driving the movements of the hoist, trolley, and bridge.

2) Most EOT cranes use electric motors to power their movements. The type of motor depends on the crane's design and application requirements.Motors in an EOT crane are usually powered by a three-phase AC supply, although some specialized cranes might use DC supply.

3) Modern EOT cranes use variable frequency drives (VFDs) for better control over speed, torque, and energy efficiency. Control systems can be manual (with a pendant control) or automated (with remote control or programmable logic controllers).Modern motors often come with built-in sensors that monitor temperature, vibrations, and other conditions to ensure safe and efficient operation.

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Sound and light alarm system & limit switch

1) Sound and light alarm system

An overhead EOT (Electric Overhead Traveling) crane's sound and light alarm system is an essential safety feature designed to ensure the safe operation of the crane and to alert nearby personnel of its movements or operational status.

Sound Alarms:Horn or Siren: Often used to alert workers when the crane is moving or when an emergency occurs. The sound is typically loud and attention-grabbing.Buzzer: Used for less urgent notifications, such as signaling the crane's movement or when a load is nearing a predetermined position.Multiple Tones: Some systems can emit different tones for different types of alerts (e.g., continuous sound for emergencies, intermittent for general warnings).

Light Alarms:Flashing Beacons: These are mounted on the crane's body or nearby structures. They flash at a set frequency to alert workers of the crane's movement or operation.Strobe Lights: Used for high-visibility warnings, especially in low-light or dark environments.Colored Lights: Different colors can indicate different statuses (e.g., red for danger, yellow for caution, green for safe operation).

2) Limit switch

A limit switch on an overhead EOT (Electric Overhead Traveling) crane is a safety device designed to control and limit the movement of the crane's hoist, trolley, or bridge. It ensures that the crane does not move beyond a set position, protecting the crane structure and surrounding equipment from damage or accidents.

Key Functions:

Position Control: The limit switch acts as a boundary that stops the crane's movement when it reaches a specific position, preventing it from moving too far in any direction.

Safety Mechanism: It provides an automatic stop to prevent collisions with structures, equipment, or other cranes.

Overload Protection: Some limit switches are combined with other safety features to protect the crane and its load from operating beyond safe limits.

Types of Limit Switches:

Mechanical Limit Switches: These are the most common types and use a physical actuator (like a cam or roller) that triggers an electrical switch when the crane reaches its set limit.

Electronic Limit Switches: These use sensors or proximity devices to detect the position of the crane and send a signal to stop it when necessary.

Overload Limit Switches: These switches can be used to monitor the load on the crane and trigger an automatic stop if it exceeds the crane's rated capacity.

10.Safety Devices

1. Limit Switches

Purpose: Prevents the crane from moving beyond a certain limit in any direction, which protects against over-travel and potential collisions.

Types: End limit switches and anti-collision limit switches.

2. Overload Protection

Purpose: Prevents the crane from lifting loads heavier than its rated capacity, reducing the risk of damage to the crane and avoiding accidents.

Implementation: Often involves load cells or sensors that trigger an alarm or automatically cut off power to the hoist if an overload is detected.

3. Emergency Stop Button

Purpose: Allows operators to stop all crane operations immediately in case of an emergency, preventing accidents or damage.

Features: Usually placed in accessible areas on the control panel and other locations around the crane.

4. Hoist Limit Switch

Purpose: Automatically stops the hoist motor when the load reaches its maximum safe height, preventing damage to the hoist and load.

Function: Can be used to set upper and lower limits for the hoist operation.

5. Anti-collision Device

Purpose: Prevents two cranes on the same track from colliding with each other.

Methods: Use of radar or ultrasonic sensors to detect the distance between cranes and stop them if they approach each other.

6. Cross Travel Limit Switch

Purpose: Prevents the crane from moving past the end of its travel path along the bridge.

Function: Stops or reverses the crane when it reaches the designated limit.

7. Emergency Power Cut-off

Purpose: Quickly disconnects the crane from its power source in the event of an emergency, reducing the risk of further damage or accidents.

8. Braking Systems

Purpose: Ensures that the crane can stop safely and hold loads securely.

Types: Mechanical brakes (such as disc brakes), electrical braking systems, and hydraulic brakes.

9. Safety Rope/Chain (Anti-Two Block)

Purpose: Prevents the hoist hook or block from coming into contact with the load block or any other part of the crane.

Function: When the hook is raised to a certain height, it activates the system to cut off power or trigger an alert.

10. Crane Operator Cab Safety Features

Purpose: Ensures the safety and comfort of the crane operator.

Features: Includes safety glass, protective barriers, ergonomic seating, and visibility enhancements.

11. Radio Remote Control Safety

Purpose: Reduces risk by allowing the operator to control the crane from a safe distance.

Features: Often comes with emergency stop, automatic stop, and safety lock-out functions.

12. Temperature and Environmental Monitors

Purpose: Monitors the operating environment to ensure it is safe for crane operation.

Types: Systems that detect high temperatures, high humidity, or other conditions that could affect safety.

13. Ground Fault Circuit Interrupter (GFCI)

Purpose: Protects the crane from electrical hazards due to ground faults by cutting off power if a fault is detected.

14. Warning Lights and Alarms

Purpose: Warns operators and nearby personnel of a potential hazard or when the crane is in operation.

Types: Strobe lights, horns, or audible alarms.

15. Load Moment Indicator (LMI)

Purpose: Provides real-time monitoring of load and crane stability to avoid overloading.

Function: Alerts the operator if the load is approaching or exceeding the safe limits.

11.Control Mode

1) Pendant Control:Description: A wired control system where the operator uses a pendant with push buttons to operate the crane.

2) Radio Remote Control:Description: A wireless control system that uses radio frequency signals to operate the crane.

3) Cabin Control：Description: The crane is operated from a cabin mounted on the crane itself, where the operator uses levers or joysticks to control its movements.

4) Automatic/Programmed Control：Description: The crane operates automatically based on pre-set instructions or software programming.

5) Joystick Control：Description: Operated via a joystick for precise control over crane movements, typically found in cabin or remote control setups.

12.Sketch

 

Main technical

 

 

11. Enhanced Efficiency

Facilitates the movement of heavy loads across large workspaces with precision.Reduces manual handling time, leading to faster operations and increased productivity.

2. High Load Capacity

Capable of handling heavy and bulky loads, ranging from a few tons to hundreds of tons, depending on the crane's design.

3. Space Optimization

Operates overhead, leaving the floor space free for other activities or machinery.Ideal for crowded or restricted work environments.

4. Versatility

Suitable for various industries such as manufacturing, construction, automotive, shipbuilding, and warehouses.Can be customized with different attachments for specific tasks (e.g., magnets, hooks, or grabs).

5. Safety

Minimizes the risk of workplace accidents by eliminating the need for manual handling of heavy objects.Equipped with advanced safety features such as overload protection, emergency brakes, and anti-collision systems.

6. Cost-Effectiveness

Reduces labor costs by automating the lifting and moving of materials.Durable design ensures a long lifespan with minimal maintenance costs over time.

7. Precision and Control

Provides precise movement with advanced controls, enabling accurate positioning of loads.Available with manual, semi-automatic, or fully automated control systems.

8. Scalability

Comes in a variety of sizes and configurations (single girder, double girder, gantry cranes) to meet specific application needs.Can be upgraded or adapted as operational requirements change.

9. Reduced Material Damage

Smooth and controlled movement minimizes the risk of damage to the materials being handled.

10. Improved Workflow

Streamlines operations by allowing for efficient material handling across multiple production stages.

 

 

1. Manufacturing and Production Facilities

Material Handling: Moving raw materials, semi-finished, or finished goods across production lines.

Assembly Lines: Assisting in assembling large components or machines.

Maintenance: Lifting and holding heavy parts for maintenance tasks.

2. Steel and Metal Industries

Steel Mills: Handling molten metal, slabs, and coils.

Metal Fabrication: Moving large sheets, beams, or other fabricated metal parts.

3. Warehousing and Storage

Inventory Management: Lifting and stacking heavy goods in warehouses.

Shipping and Receiving: Loading and unloading materials from trucks or railcars.

4. Construction Industry

Precast Concrete: Handling heavy precast elements like beams, girders, and slabs.

Bridge and Dam Construction: Transporting large materials used in these structures.

5. Automobile and Aerospace Industries

Vehicle Manufacturing: Lifting heavy automotive parts, engines, or body frames.

Aircraft Assembly: Handling large aircraft components like wings and fuselage sections.

6. Power Plants

Hydropower and Thermal Plants: Transporting turbines, generators, and other heavy equipment.

Nuclear Plants: Handling radioactive materials in shielded containers.

7. Ports and Shipping Yards

Cargo Handling: Unloading and loading containers or heavy equipment.

Shipbuilding: Assisting in assembling large ship parts.

8. Mining and Quarrying

Material Transport: Moving mined ore or heavy machinery parts.

9. Paper and Pulp Industry

Roll Handling: Lifting and transporting large rolls of paper.

10. Specialized Applications

Heavy Equipment Manufacturing: Moving oversized machinery or tools.

 

 

1. Requirement Analysis

Understand client needs: Load capacity, span, lifting height, working environment, and duty classification.Site inspection: Evaluate the site conditions, such as available space, structural capacity, and operational constraints.

2. Design and Engineering

Preliminary design: Create a concept based on client requirements.Load calculations:Calculate the maximum load capacity.

Determine forces on the crane structure and runway beams.Structural design:Design main girders (single or double) based on load and span.Define the end carriages, cross beams, and hoist trolley.Electrical system design:Develop the control system, including motors, VFDs, limit switches, and remote control.

Ensure compliance with standards like IEC, ISO, or local codes.Safety considerations:Include emergency stops, overload protection, and anti-collision systems.

3. Material Procurement

Steel: High-strength structural steel for girders and frames.Motors and components: Crane-specific motors, gearboxes, brakes, and control panels.Hoist: Electric hoist with appropriate load capacity and lift height.Wiring and accessories: Electrical cables, limit switches, and safety devices.

4. Fabrication

Girder fabrication:Cut steel plates and assemble girders using welding or bolting.Ensure straightness and alignment during assembly.Conduct non-destructive testing (NDT) to verify weld quality.End carriages:Fabricate the end carriages to house wheels and drive mechanisms.Assemble with precision to ensure proper alignment with rails.Machining:Machine critical components like wheel shafts, bearing housings, and trolley frames.Surface preparation:Sandblast and paint all steel components with anti-corrosive coatings suitable for the working environment.

5. Assembly

Mechanical assembly:Assemble the main girder with end carriages.Mount the hoist trolley and align with rails.Electrical assembly:Install motors, control panels, and wiring.

Connect safety devices, including limit switches and sensors.

6. Testing

Load testing:Perform no-load and full-load tests to verify structural integrity.Test with overload (usually 125% of rated capacity) as per standards.Functional testing:Check motor performance, braking, and control response.Verify the smooth operation of the hoist, trolley, and bridge movement.Safety checks:Test emergency stop functions and limit switches.Inspect anti-collision devices and other safety systems.

7. Quality Control

Compliance checks:Ensure compliance with applicable standards (e.g., ISO 9001, CE marking, or ASME standards).Inspection:Inspect welds, dimensions, alignment, and electrical connections.Verify paint quality and environmental resistance.

8. Installation and Commissioning

Site preparation:Install runway beams and rails with proper alignment.Ensure the foundation can support the crane's weight and load.Erection:Lift and position the crane on the runway beams.

Align wheels with the rail to ensure smooth travel.Final testing:

Perform on-site functional and load tests.Train operators on crane usage, maintenance, and safety protocols.

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%.