Girder Eot Crane

 

Girder Eot Crane is highly efficient lifting solutions designed to handle heavy loads in various industrial settings. Known for their reliability, precision, and adaptability, these cranes play a critical role in optimizing material handling processes.

Girder Eot Crane is made of a sturdy design with high-strength beams to ensure durability and safety during operation. They are also available in single or double beam configurations with high lifting capacities, capable of handling loads from a few tons to hundreds of tons. Equipped with advanced motor systems and control mechanisms for precise and smooth lifting and positioning. Tailored to specific requirements, including span length, lifting height and operating speed. Includes overload protection, emergency stop system and anti-collision device.

Girder Eot Crane is designed and manufactured by industry experts with many years of experience. Manufactured with quality components to ensure longevity and reliability. Comprehensive after-sales service and maintenance options. Adhering to international safety and quality standards.

Core Components: Engine, Bearing, PLC, Gearbox, Motor, Gear

Place of Origin: China

Warranty: 1 Year

Weight (KG): 1800 kg

Video outgoing-inspection: Provided

Machinery Test Report: Provided

Application: Lifting goods in the workshop

Product Name: girder eot crane

Crane type: bridge crane

Lifting mechanism: Eliectric Hoist

Color: Customized Color Acceptable

MOQ: 1 Set

Type : Hoist Single Girder Bridge Crane

Usage: Workshop Workstation Construction Application

Pictures & Components

1.Main beam

The main beam of a girder EOT (Electric Overhead Traveling) crane is a critical structural component designed to support and transfer loads.

The main beam (or girder) is the horizontal structure in an EOT crane that spans the width of the crane's working area. It supports the hoist, trolley, or other lifting mechanisms and transfers the weight of the load to the end trucks or bridge wheels.

The type of main beam depends on the crane's design and load requirements:

Single Girder

Structure: Consists of a single horizontal beam.

Applications: Lighter loads and shorter spans.

Advantages:Cost-effective.Lower weight reduces the load on supporting structures.Easier installation and maintenance.

Double Girder

Structure: Two parallel horizontal beams.

Applications: Heavier loads and longer spans.

Advantages:Greater load-carrying capacity.Can support larger hoists or trolleys.Suitable for higher lifting heights.

Lifting System

The lifting system of a girder EOT (Electric Overhead Traveling) crane is a crucial component that allows it to lift and move heavy loads. Below are the key elements and functions of the lifting system in such cranes:

Functional characteristics of the lifting system:

Hoist Motor: Powers the lifting process, often controlled by a Variable Frequency Drive (VFD) for precise speed control.

Drum: A cylindrical device around which the wire rope winds during lifting or lowering operations.

Wire Rope or Chain: Connects the load to the drum. Wire ropes are common in heavy-duty applications due to their strength and durability.

Hook Block: The part where the load is attached, usually equipped with a swivel hook for flexibility.

 

 

3.End carriage

In the structure of an electric single-girder overhead crane (EOT Crane), the end carriage is one of the key components. It is located at both ends of the main girder and is used to support the main girder and connect the crane to the running track.

Function

Support the main girder: The end carriage is connected to the main girder through a rigid or flexible connection to carry the lifting weight together.

Achieve horizontal movement: The end carriage is equipped with wheels or drive mechanisms and runs on the track, allowing the crane to move along the length of the plant.

Provide stability: A well-designed end carriage ensures smooth operation of the crane and reduces the risk of vibration and overturning.

Structural composition

Steel structure frame: It is usually a box-type or I-shaped structure assembled by welding or bolts, providing high strength and durability.

Wheel set: It includes a driving wheel and a driven wheel, which are installed at both ends of the end girder for the movement of the crane.

Drive device (optional): A drive motor and a reducer are installed on the active end girder to drive the wheels through a coupling.

Buffer and rail cleaning device: Reduce impact and clear obstacles on the track.

 

4.Crane travelling mechanism

1) Operation principle

The electric motor generates rotational motion when powered.This motion is transmitted through a gearbox to reduce speed and increase torque, ensuring controlled and smooth movement.The output from the gearbox is connected to a shaft that drives the crane's wheels.Driving wheels engage with the runway beams or rails, propelling the crane forward or backward.A variable frequency drive (VFD) or similar control system regulates the motor's speed and direction, providing precise control over the crane's motion.The operator can adjust speed and direction using a remote control, pendant station, or cabin control.Electromagnetic or hydraulic brakes are applied to stop the crane or hold it stationary when it is not in motion.Idle wheels ensure the crane remains stable and aligned on the rails during movement.Buffers or stoppers at the ends of the runway prevent the crane from overshooting the track.

2) Functional characteristics

1. Traveling Function

Facilitates the longitudinal movement of the crane along the runway rails.

Allows the crane to cover the entire operational area of the workshop or facility.

2. Smooth and Precise Operation

Equipped with high-quality wheels and bearings to ensure smooth motion.

Incorporates variable frequency drives (VFD) for precise speed control and positioning.

3. Load-Bearing Capability

Designed to bear the combined load of the girder, hoist, and lifted material.

Ensures stability and safety during operation under varying load conditions.

4. Durability and Strength

Constructed with robust materials to withstand heavy loads and harsh working environments.

Resistant to wear and tear due to constant movement and load stress.

5. Synchronization

Incorporates mechanisms to synchronize the movement of both ends of the crane to avoid skewing.

Ensures uniform and aligned travel along the runway beams.

6. Energy Efficiency

Uses energy-efficient motors and drives to minimize power consumption during operation.

Regenerative braking systems can be included to save energy.

7. Safety Features

Includes brakes for emergency stops and controlled deceleration.

Anti-collision devices and limit switches to prevent over-travel and accidents..

Trolley travelling mechanism

key components：

1. Trolley Frame：The trolley frame serves as the base structure on which all other components are mounted.It is designed to ensure stability and support during movement.

2. Traveling Wheels：The wheels run on rails installed along the girder.They are usually made of hardened steel for durability and smooth operation.The wheels may include flanges to prevent derailment.

3. Driving Mechanism：A motorized driving system propels the trolley along the girder.Key elements of the driving mechanism include:Electric Motor: Powers the motion. It can be a squirrel cage motor or slip ring motor depending on the application.Gearbox: Reduces motor speed to provide the appropriate torque for trolley movement.Couplings: Connects the motor to the gearbox and the gearbox to the drive wheels, ensuring efficient power transmission.

4. Braking System：The braking system ensures the trolley stops safely and precisely.This typically involves:Electromagnetic Brakes:Automatically engage when the motor is de-energized.Manual Override: Allows emergency braking if required.

5. Rail and Track System：Rails are mounted on the crane girder to guide the trolley.They are made of high-strength steel to withstand the load and minimize wear.

Function：

Horizontal Load Movement

The trolley traveling mechanism allows the hoist to move along the length of the girder, facilitating horizontal movement of the load. This ensures that the load can be positioned accurately over the desired area.

Load Distribution

The movement of the trolley helps distribute the weight of the load evenly along the girder, reducing stress on specific points of the structure.

Flexibility in Operations

By combining the trolley's horizontal movement with the crane's longitudinal movement (along the runway) and the hoist's vertical movement, the crane achieves three-dimensional load positioning capabilities.

Improved Work Efficiency

The trolley mechanism ensures quick and smooth positioning of the hoist and the load, reducing operation time and improving efficiency in material handling tasks.

Safety and Control

Modern trolley mechanisms often come equipped with braking systems and precise control systems, ensuring safe and controlled movement of heavy loads.

 

6.Crane wheel

1) Operation principle

Track rolling: When the crane moves, the motor drives the wheel to rotate, and the wheel rolls on the track, thereby realizing the lateral movement of the crane.

Load distribution: The design of the wheel group is usually a multi-wheel structure, which can effectively disperse the total load of the crane, reduce the pressure on the track, and extend the service life of the track and wheels.

Guidance function: The design of the wheel should also take into account the guidance function to ensure that the crane remains in the center of the track when moving to prevent derailment or tilting.

2) Maintenance and care

Regular inspection: The wear of the wheel needs to be checked regularly to ensure good contact between the wheel and the track to prevent accidents caused by excessive wear.

Lubrication: The bearings of the wheel need to be lubricated regularly to reduce friction, improve operating efficiency, and extend service life.

Cleaning: The part where the wheel contacts the track needs to be kept clean to prevent friction damage or wear caused by debris.

7.Crane Hook

The crane wheel in an EOT (Electric Overhead Traveling) Crane, particularly on the girder, plays a vital role in supporting and facilitating the horizontal movement of the crane along the runway rails.

Features of Crane Wheels

Material:Made of high-strength steel or alloy steel for durability.Heat-treated to enhance wear resistance and reduce the risk of deformation.

Types:Single Flanged: Guides the wheel along the rail.Double Flanged: Provides additional stability.Flat Tread: Used for applications where flanges are not necessary, relying on external guidance.

Design:Precision machining ensures smooth rolling and reduced wear.

Flanges ensure the wheel stays aligned on the track.

Functions of Crane Wheels

Load Support: They bear the weight of the crane, the girder, and the lifted load.

Motion: Enable the horizontal movement of the crane along the rails.

Stability: Flanges help prevent derailment, ensuring safe operation.

Maintenance of Crane Wheels

Regular Inspection: Check for wear, cracks, and deformation.

Lubrication: Ensures smooth motion and reduces friction.

Motor

The motor of a girder EOT (Electric Overhead Traveling) crane is a critical component responsible for driving the movement of the crane, including its hoisting, cross travel, and long travel motions.

Purpose of the Motor

Hoisting Motor: Lifts and lowers loads using the hook or other lifting mechanisms.

Cross Travel Motor: Moves the hoist or trolley across the girder.

Long Travel Motor: Moves the entire crane along the runway beams.

Types of Motors Used

Squirrel Cage Induction Motors: Commonly used for their robustness and efficiency.

Slip Ring Motors: Used when high torque is required, especially for heavy-duty operations.

Servo Motors: Provide precise control for advanced systems.

DC Motors: Found in older cranes or specific applications requiring variable speed and smooth start/stop.

Key Features of Crane Motors

High Starting Torque: Ensures the motor can handle heavy loads during start-up.

Brake Systems: Often integrated or paired with electromagnetic or mechanical brakes to ensure safety.

Duty Cycle: Motors are designed for intermittent duty cycles (S2, S3, etc.), considering the operating conditions of cranes.

IP Rating: High ingress protection (e.g., IP54, IP55) to protect against dust and moisture in industrial environments.

.

Sound and light alarm system & limit switch

Sound and light alarm system

A sound and light alarm system is a crucial safety feature in girder EOT (Electric Overhead Traveling) cranes. It enhances the safety of workers and the operational environment by providing visual and auditory warnings during crane operation.

Audible Alarm (Buzzer or Horn):Emits a loud sound to alert workers in the vicinity of the crane's movement or operation.Different tones or patterns may indicate different actions, such as lifting, lowering, or traveling.

Visual Alarm (Strobe Light or Beacon):A flashing or rotating light that serves as a visual indicator of crane movement.Often uses bright colors (red, yellow, or blue) for better visibility in industrial settings.

Functions:

Operational Warnings:Alerts workers when the crane is in motion or performing a specific task, such as lifting or lowering loads.Ensures safety by notifying personnel to maintain a safe distance from the crane's operation zone.

Emergency Situations:Provides critical alarms during malfunctions, overloads, or other unsafe conditions.Enables quick evacuation or immediate response to mitigate risks.

Visibility EnhancementImproves the visibility of the crane's operational status, especially in noisy environments or low-light conditions.

2) Limit switch

A limit switch for an Electric Overhead Traveling (EOT) Crane's girder is a crucial safety and operational device designed to control the crane's motion and prevent accidents or mechanical damage.

Purpose

Safety Control: Stops the crane when it reaches the end of its allowable travel to avoid collisions or derailments.

Position Limiting: Defines the maximum permissible movement of the crane or its components.

Automation and Efficiency: Helps in automating operations by stopping or reversing motion at predefined positions.

Types of Limit Switches Used in EOT Cranes

Rotary Limit Switch:Monitors and limits rotational movement (e.g., hoisting operations).Stops the motor when the hoist reaches its upper or lower limit.

Lever-Type or Cam-Operated Limit Switch:Activated by physical contact with a cam or lever mounted on the crane.Typically used for trolley travel or girder end stops.

Proximity Limit Switch:Uses non-contact sensing methods (inductive, capacitive, or optical).Commonly used for advanced EOT cranes with precise stopping requirements.

10.Safety Devices

1) Overload protection device: prevent the crane from overloading. When the actual load of the crane exceeds the rated lifting weight, the overload protection device will automatically cut off the power supply or sound an alarm to prevent damage to equipment and personnel.

2) Emergency stop device: used to manually stop the operation of the crane in an emergency. The operator can quickly cut off the power supply of the equipment by triggering the emergency stop button to prevent accidents.

3) Windproof device: prevent the crane from being blown by strong winds when working outdoors. The windproof device can be a mechanical locking device or an electric locking device. When the wind speed exceeds the safety standard, the crane will automatically lock to prevent the equipment from being dangerous due to wind.

4) Electrical protection device: prevent equipment damage or safety accidents caused by electrical faults. Electrical protection devices include short-circuit protection, undervoltage protection, phase failure protection, etc., which can automatically cut off the power supply when the electrical system is abnormal to prevent damage to the equipment or affect safety.

5) Anti-sway device: reduce or prevent the swing of the hook and load during lifting, ensure the stability of material handling, and prevent the material from falling off due to swinging.

6) Buffer device: A buffer is installed at the terminal position of the crane. When the equipment or vehicle approaches the end of the track, the buffer device can absorb part of the impact force to avoid damage to the equipment or personnel.

11.Control Mode

1. Pendant Control

Description: A handheld control device attached to the crane by a cable.

Features:

Allows the operator to control the crane while walking alongside it.

Includes buttons or joysticks to operate lifting, lowering, and traveling motions.

Advantages:

Simple and cost-effective.

Provides close-range control, making it ideal for precise positioning.

2. Remote Control

Description: Wireless control using radio frequency or infrared signals.

Features:

Enables the operator to control the crane from a safe distance.

Equipped with buttons or joysticks for multi-directional operation.

Advantages:

Enhances operator safety by allowing operation away from the load.

Offers flexibility and freedom of movement.

3. Cabin Control

Description: A control cabin attached to the crane, allowing the operator to oversee and control operations from above.

Features:

Includes joysticks, buttons, and a control panel for all crane movements.

Often used in heavy-duty or large-scale operations.

Advantages:

Provides an elevated view of operations, improving precision.

Comfortable for operators during long working hours.

4. Automated or Semi-Automated Control

Description: Control through a pre-programmed system or software.

Features:

The crane operates based on pre-set instructions or through minimal human intervention.

Often integrated with sensors, cameras, or IoT systems.

Advantages:

High efficiency and precision.

Reduces human errors and increases productivity.

5. Hybrid Control

Description: Combines two or more control methods, such as pendant and remote control.

Features:

Allows switching between control modes as needed.

Advantages:

Offers flexibility to adapt to different operational needs.

12.Sketch

Main technical

 

 

1. High Load Capacity

Girder EOT cranes, especially double-girder types, can handle heavy loads, often exceeding 100 tons, making them suitable for large-scale operations.

2. Versatility

Suitable for various industries, including manufacturing, construction, shipping, and warehousing.

Can accommodate diverse lifting requirements by attaching specialized hoists or grabs.

3. Efficient Material Handling

Facilitates the easy and quick movement of materials across large spaces, reducing the time and effort needed compared to manual handling.

4. Customizable Design

Available in single-girder and double-girder configurations to suit specific operational needs.

Can be designed with custom spans, lifting heights, and speeds to fit unique workspaces.

5. Space Optimization

Double-girder cranes allow higher lifting heights, making better use of vertical space.

Single-girder models require less headroom and are ideal for facilities with height restrictions.

6. Durability and Longevity

Built with robust materials and advanced engineering to withstand harsh industrial environments.

Regular maintenance ensures a long service life.

7. Safety Features

Equipped with advanced safety mechanisms such as overload protection, emergency stop systems, and anti-collision devices.

Ensures operator safety and minimizes risks during operation.

8. Cost Efficiency

Reduces the need for additional lifting equipment, saving costs in the long run.

Minimizes labor costs and increases productivity.

9. Automation and Control

Modern girder EOT cranes offer remote control and automation options, enhancing operational precision and efficiency.

Programmable controls allow for repetitive tasks to be handled with minimal supervision.

10. Energy Efficiency

Many models incorporate energy-efficient motors and systems to reduce power consumption and operational costs.

11. Wide Span Capabilities

Particularly in double-girder designs, these cranes can cover wide spans, making them ideal for large industrial facilities.

 

 

1. Manufacturing Industries

Assembly Lines: Used to lift and position heavy components during assembly.

Production Units: For transporting raw materials or finished goods.

Heavy Equipment Manufacturing: Ideal for handling large machinery parts.

2. Warehousing and Logistics

Material Handling: EOT cranes streamline the storage and retrieval of heavy items.

Loading and Unloading: Facilitates the movement of goods in and out of storage areas.

3. Steel Plants

Handling Steel Products: Used for lifting heavy steel coils, plates, and structural components.

Hot Metal Handling: Double girder EOT cranes are used in high-temperature environments to handle molten metal safely.

4. Power Plants

Turbine Maintenance: Assists in lifting and maintaining turbines and other heavy equipment.

Material Movement: Helps in transporting fuel or other materials used in the power generation process.

5. Construction Industry

Precast Components: Lifts precast concrete beams, girders, and other structural elements.

Site Material Handling: Facilitates the efficient transport of construction materials.

6. Ports and Shipyards

Cargo Handling: Used to move heavy containers and machinery.

Shipbuilding: Assists in lifting and positioning large ship components.

7. Mining Industry

Ore Handling: Moves extracted ores to processing areas.

Equipment Maintenance: Lifts and transports mining equipment for repair or replacement.

8. Automotive Industry

Vehicle Assembly: EOT cranes handle the lifting of engines, chassis, and other components.

Parts Manufacturing: Assists in transporting heavy dies and molds.

 

 

1. Design and Engineering

Requirement Analysis: Collect the specifications such as load capacity, span, height, and working environment.

Design: Use CAD (Computer-Aided Design) software to design the girder according to international standards (e.g., FEM, CMAA, or IS).

Material Selection: Choose high-quality structural steel suitable for the operating conditions (e.g., weather, load stress).

2. Raw Material Procurement

Steel Plates and Sections: Procure high-grade steel plates and structural components.

Quality Inspection: Inspect the raw materials for defects like cracks, rust, or other irregularities.

3. Cutting and Preparation

CNC Cutting: Use CNC plasma or laser cutting machines to cut the steel plates and sections to the required dimensions.

Edge Preparation: Ensure smooth edges for better welding quality.

4. Welding and Assembly

Preparation: Clean surfaces to remove oil, rust, or contaminants.

Welding:

Use advanced welding techniques such as submerged arc welding (SAW) or manual arc welding for precision.

Follow proper welding sequences to avoid deformation.

Stress Relief: Use heat treatment or controlled cooling to reduce residual stress in welded joints.

5. Inspection of Welds

Non-Destructive Testing (NDT):

Perform ultrasonic testing (UT), radiographic testing (RT), or dye-penetrant testing (DPT) to check for internal or surface defects.

Dimensional Check: Verify dimensions to match design specifications.

6. Surface Treatment

Shot Blasting: Clean the surface to remove rust and improve paint adhesion.

Painting:

Apply anti-corrosion primers and finish with weather-resistant coatings.

Ensure the paint thickness complies with standards.

7. Assembly of Components

Attachment: Install components such as rails, platforms, and brackets as per the design.

Trial Assembly: Pre-assemble the girder with the end carriages to check alignment.

8. Load Testing

Static Load Test: Apply a stationary load to test the girder's ability to withstand weight.

Dynamic Load Test: Simulate operating conditions by moving loads to assess performance.

9. Final Inspection

Quality Check: Conduct a final inspection to verify compliance with design and safety standards.

Certification: Issue a certificate of compliance.

10. Packaging and Delivery

Packaging: Protect the girder with appropriate coverings for transport.

Delivery: Transport the girder to the installation site using suitable logistics.

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%.