Electric Motor Driven Single Girder Gantry Crane

An electric motor-driven single girder gantry crane is a versatile lifting solution for outdoor and indoor applications where overhead bridge cranes are impractical. It consists of a single main beam supported by legs with wheels, powered by electric motors for hoisting and travel. Below is a detailed breakdown of its features, components, and applications.

Place of Origin:Henan, China

Warranty:2 years

Weight (KG):60000 kg

Video outgoing-inspection:Provided

Machinery Test Report:Provided

Application:warehouses,factory and other place

Crane type:box type gantry crane

Travelling speed:20m/min

Lifting mechanism:Electric Hoist

Control method:Ground Control+ Remote Control (customized)

Working duty:A5

Working Temperature:-20~+40℃

Industrial voltage:380V50HZ3Phanse or other

Color:Customised

Customization:Accepted

1.Main beam

Design and Structure
1)Shape and Material: The main beam is typically an I-beam or box girder, designed to handle substantial loads while minimizing weight. It is made of high-strength steel to ensure durability, safety, and reliability in lifting operations.
2)Length: The length of the main beam varies based on the crane's span (the distance between the supporting columns or rail tracks). Standard spans usually range from 6m to 35m, but they can be customized based on operational requirements.
3)Single Girder Design: As a single girder crane, the structure uses one main beam, which supports the hoisting mechanism and trolley. This makes it more compact and cost-effective compared to a double girder crane.

2.Lifting System

The hoist is the heart of the lifting system, providing the force required to raise and lower the load. It is mounted on the trolley that moves along the main beam (girder).
1)Types of Hoists:
Electric Wire Rope Hoist: Uses a steel wire rope for lifting. Commonly used for heavier loads due to its durability and strength.
Electric Chain Hoist: Uses a chain instead of a rope. Suitable for lighter loads and applications where precision lifting is necessary.
2)Main Components of the Hoist:
Motor: The electric motor powers the hoisting mechanism. The motor is connected to the hoist drum or chain sprocket.
Drum/Chain Sprocket: The hoist drum (in rope hoists) or the chain sprocket (in chain hoists) is responsible for winding the rope or chain as the load is lifted.
Load Hook/Block: The hook is the part of the hoist that holds the load. It is attached to the lifting rope or chain.
Brake System: The brake prevents the load from accidentally dropping. The system ensures that the load is safely held when the crane is stopped or in idle mode.
Limit Switches: These are used to prevent the hoist from going beyond its maximum lifting height or lowest point, ensuring safety.

3.End carriage

Function and Purpose
1)Support for the Girder: The end carriage provides the structural support needed to hold the main girder (beam) of the crane, allowing it to move along the runway rails.
2)Movement Mechanism: The end carriage allows the horizontal movement of the crane along the rails (gantry travel), making it possible for the crane to move from one location to another along a predefined track.
3)Integral Part of Crane's Mobility: The end carriage system includes wheels, motors, brakes, and drives, all working together to ensure smooth and safe movement along the track.

4.Crane travelling mechanism

Function and Purpose
1)Horizontal Movement: The crane traveling mechanism allows the gantry crane to travel horizontally across the runway rails, enabling it to cover the required operational area.
2)Supports the Main Girder: The traveling mechanism is responsible for carrying the weight of the main girder, the hoist, and the load during its movement along the rails.
3)Ensures Precision: The traveling mechanism provides the necessary precision in movement to position the crane at specific locations along the rail track.

5.Trolley travelling mechanism

Function and Purpose
1)Horizontal Movement of Trolley: The main function of the trolley traveling mechanism is to move the trolley (which holds the hoist) along the main girder, allowing it to transport loads across the span of the crane.
2)Load Positioning: This movement enables precise positioning of the load over different points of the crane, ensuring the load can be transferred or placed accurately.
3)Smooth Operation: The system must work smoothly to prevent jerky movements that could harm the load or damage the crane's components.

6.Crane wheel

Function and Purpose
1)Support the Crane's Weight: The wheels support the entire weight of the crane, including the main girder, trolley, hoist, and any load being carried. They distribute the weight evenly across the rails.
2)Enable Horizontal Movement: The wheels allow the crane to move horizontally along the runway rails or track system (gantry travel) to transport materials within the work area.
3)Provide Stability: The wheels must provide stability to the crane to ensure smooth, safe, and controlled movement along the track.

7.Crane Hook

Material and Construction:
1)High-Strength Steel: Hooks are typically made from high-strength steel or alloy steel that is forged for enhanced strength and durability.
2)Forged Design: The hook is often forged, meaning it is shaped by applying heat and pressure to steel to ensure it has the necessary strength to handle heavy loads without failure.
3)Heat Treatment: The hook is subjected to heat treatment processes (such as tempering or quenching) to increase its strength and hardness, ensuring it can handle high loads without deformation.

8.Motor

Types of Motors Used in Gantry Cranes
1)AC Motors (Alternating Current Motors):
AC motors are the most common type of motor used in cranes because they are efficient, reliable, and capable of handling the continuous demands of crane operation.
These motors are used to power both the hoist and the travel mechanisms (main beam travel and trolley travel).
2)DC Motors (Direct Current Motors):
In some older crane models, or in specific applications where precise speed control is necessary, DC motors may be used. DC motors offer smooth speed control and are sometimes preferred for lower-speed operations or specific load-handling tasks.
3)Synchronous Motors:
Synchronous motors are used in applications where exact synchronization between the motor speed and the crane's load movement is required.
These motors are typically used in high-precision lifting and transport applications.

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9.Sound and light alarm system & limit switch

1)Sound and Light Alarm System of Electric Motor Driven Single Girder Gantry Crane
Purpose and Function
Safety Alert: The sound and light alarm system serves to warn operators and other personnel in the vicinity of potential hazards. It provides audible and visual signals to indicate various operational conditions.
Warning for Movements: When the crane is in motion, especially during lifting, traveling, or positioning loads, the alarm system helps warn nearby personnel to stay clear of the moving crane.
Overload or Fault Warning: The system can also be used to alert operators if the crane is experiencing an overload condition, a mechanical fault, or other malfunctions.
2)Limit Switch of Electric Motor Driven Single Girder Gantry Crane
Purpose and Function
Prevent Overtravel: The limit switch is a safety device designed to prevent the crane from overtravelling beyond its safe operating limits. It ensures that the crane components (such as the hook, trolley, and hoist) do not exceed their designed travel range.
End of Travel Detection: The limit switch detects when the crane has reached its maximum or minimum position (end of travel), cutting off further movement to prevent damage to the crane or surrounding infrastructure.
Safety for Personnel: It also prevents dangerous conditions where the crane might move into an unsafe area, reducing the risk of accidents involving workers or equipment.

10.Safety Devices

1)Overload Protection Device
Purpose: Protects the crane and its components from damage caused by lifting loads that exceed the crane's rated capacity.
2) Emergency Stop System
Purpose: To quickly stop the crane in the event of an emergency, preventing further damage or accidents.
3)Limit Switches
Purpose: Prevents the crane from exceeding its safe operational limits by stopping movement once a set limit is reached.
4)Anti-Collision System
Purpose: To prevent accidents caused by collisions between the crane and other equipment or structures.
5)Brake System
Purpose: To stop the crane safely and securely, especially in the event of a sudden power failure or emergency.
6)Crane Sway Prevention System
Purpose: To reduce the swaying of the load during lifting and moving.

11.Control Mode

The control system allows operators to move the hoist up and down smoothly and safely. The control system includes the following components:
1)Control Panel: Allows the crane operator to control the hoist and lifting speeds, often integrated with other crane movement controls (travel, trolley).
2)Pendant Control: A wired device that allows the operator to control the crane from the ground or from a safe distance.
3)Wireless Remote Control: A remote control that allows the operator to control the crane from a distance without the need for physical connection.
4)Cab Control (for larger cranes): If the crane is large enough, a cabin with integrated controls will be mounted on the crane.

Sketch

Main technical

1. Energy Efficiency
Electric Motor: The crane uses electric motors for its operations, which are generally more energy-efficient than other power sources like diesel engines or hydraulic systems. This results in lower operational costs over time and is more environmentally friendly.

Variable Speed Control: Many electric motor-driven cranes come with advanced control systems that allow for precise speed regulation, reducing energy waste during non-peak operations.

2. High Lifting Capacity
The single girder design allows for substantial lifting capacities while maintaining a relatively lightweight structure. Despite having a single girder, these cranes can lift heavy loads within their capacity range, often making them suitable for a wide array of lifting tasks in industries like shipping, construction, and manufacturing.

3. Compact Design and Space Saving
The single girder design is more compact compared to double girder systems, which helps save space in facilities with limited overhead clearance. This design makes the crane ideal for operations in smaller spaces or areas with restricted headroom.

The compactness of the crane also contributes to its lighter weight, making it easier to install, maintain, and operate without requiring significant infrastructure changes.

4. Smooth and Precise Operation
The electric motor offers smooth and precise control over the crane's movements, resulting in accurate load handling. This is essential for operations that require high precision and minimal load sway, such as in assembly lines or when working with delicate materials.

Variable Frequency Drives (VFDs) allow for soft starting and stopping, reducing mechanical stress and improving the longevity of the crane.

5. Cost-Effectiveness
Lower Maintenance Costs: The electric motor system requires less maintenance compared to hydraulic or diesel-powered systems, as it has fewer moving parts prone to wear and tear. The long lifespan of electric motors further contributes to cost savings.

Reduced Operating Costs: Electric motors are more cost-effective to operate due to lower energy consumption compared to other types of power sources.

Affordable Installation: The design and installation of a single girder gantry crane are typically less expensive than more complex systems like double girder cranes, making it a cost-effective solution for many businesses.

6. Flexibility in Use
Multiple Applications: These cranes can be used in a wide variety of environments, from warehouses and factories to shipyards and construction sites. They are especially useful in areas where space is limited but the need for high lifting capacity is still required.

Portability: Gantry cranes are often designed to be mobile, allowing them to be used in outdoor applications or to easily move between different locations within a facility or site.

7. Safety Features
Safety Devices: Electric motor-driven single girder gantry cranes are equipped with safety features such as overload protection, limit switches, and emergency stop buttons to protect operators, equipment, and the load.

Stable Lifting: With the precise control offered by electric motors, the crane ensures that loads are lifted and moved smoothly and securely, reducing the risk of accidents such as load swings or tipping.
 

1. Manufacturing and Assembly
Assembly Lines: These cranes are commonly used in automobile manufacturing, electronics assembly, and general manufacturing to lift and move components along assembly lines. The precise control provided by the electric motor ensures accurate placement of parts.

Heavy Component Handling: In industries where large, heavy components need to be moved, such as for machinery assembly, aircraft parts, or industrial equipment, these cranes provide a stable and efficient solution for lifting and positioning.

2. Warehouses and Distribution Centers
Load Handling: These cranes are ideal for moving materials, goods, and supplies within warehouses, distribution centers, and storage facilities. They can handle palletized goods, containers, or large packages, helping to optimize storage and retrieval operations.

Order Picking: In automated systems, gantry cranes can be integrated into order picking systems, where they can retrieve specific products from high shelves or move items to shipping areas.

3. Construction Sites
Material Handling: Electric motor-driven single girder gantry cranes are used on construction sites to move building materials, steel beams, concrete blocks, and other heavy materials from one area to another.

Concrete Lifting: They are used for handling and positioning precast concrete panels and other construction components that require lifting and precise placement.

Temporary Crane Systems: These cranes are often used in temporary setups or smaller construction sites where space is tight but there is still a need for material handling.

4. Shipyards and Ports
Shipbuilding and Repair: In shipyards, these cranes are used to lift and position ship parts and heavy components during the construction or repair of ships. Their ability to handle large loads with precision is crucial in shipbuilding.

Container Handling: In ports, these cranes are often used for lifting and transferring containers and cargo from ships to trucks or rail cars. Their compact design allows them to fit in tight spaces between storage racks or vessels.

5. Rail and Logistics Industry
Cargo Handling in Rail Yards: These cranes are used in rail yards for loading and unloading freight from rail cars. They help in efficiently moving goods and materials from the tracks to storage or processing areas.

Container Storage: In logistics and intermodal transport, gantry cranes are ideal for managing and stacking shipping containers in container yards or freight terminals.

6. Mining and Mineral Processing
Ore and Material Handling: In mining facilities, these cranes are employed to lift and move heavy loads such as ores, minerals, and equipment used in mining operations. They are particularly useful in areas where space constraints limit the use of larger cranes.

Processing and Refining: In mineral processing plants, electric motor-driven gantry cranes are used to handle raw materials and processed goods as they move through different stages of refining.

7. Steel and Metal Industry
Steel Production: These cranes are used in steel mills for lifting steel beams, ingots, and coils. They play a key role in moving hot metal and heavy equipment around the mill.

Metal Fabrication: In metalworking, these cranes are ideal for moving heavy metal parts, machinery, and raw materials, as they can handle high temperatures and heavy loads.

1. Design and Engineering
Conceptual Design: The first step involves creating a conceptual design based on the customer's requirements, such as lifting capacity, span, height, and operating conditions.
Detailed Engineering: After the concept is approved, engineers prepare detailed technical drawings and specifications. This includes calculations for load capacity, structural integrity, and the selection of components such as the hoisting system, motor, wheels, and control systems.
Customization: If the crane needs to be customized for specific tasks (e.g., lifting large or heavy loads, working in extreme environments), additional engineering work is done to incorporate the necessary modifications.
2. Material Procurement
Raw Materials: After the design is finalized, raw materials like steel plates, profiles, and beams are sourced from suppliers. These materials must meet specific standards for strength, durability, and corrosion resistance.
Components: The individual components for the crane, including the electric motor, gears, limit switches, wheels, trolley, and hook, are sourced from trusted suppliers. The quality of these parts is crucial to ensuring the crane's reliability and safety.
3. Fabrication and Assembly of the Main Structure
Steel Cutting and Shaping: The raw steel is cut, shaped, and welded to form the main beam (girder), side plates, and frame of the crane. Advanced CNC (Computer Numerical Control) machines are used for precise cutting and bending to ensure accuracy in the assembly.
Welding: The steel components are welded together to form the structural frame of the crane. Welding inspection is conducted to ensure that all joints are properly bonded and meet the required strength standards.
Painting and Surface Treatment: The assembled structure is then treated with a protective coating to prevent rust and corrosion. This usually involves sandblasting the steel frame followed by painting with a high-quality industrial coating.
4. Fabrication of the Hoisting and Lifting System
Hoist Mechanism: The hoisting mechanism, which includes the electric motor, gears, drum, and wire rope, is assembled. The motor is mounted on the hoist unit, and the gears and drum are connected to the system to ensure proper load lifting.
Assembly of the Trolley: The trolley, which moves along the crane's girder, is assembled with the hoist mounted on it. This assembly must be aligned and tested to ensure smooth travel along the crane's beam.
Installation of Limit Switches: Limit switches are installed on the hoist and trolley to prevent over-travel during lifting and lowering operations.
5. Crane Traveling Mechanism and End Carriages
Travel Mechanism: The crane traveling system includes the wheels, drive motor, and track rails. The crane is designed to move along the runway tracks in a straight line. The drive system is tested for smooth operation and to ensure it meets speed and load specifications.
End Carriages: The end carriages, which house the crane's wheels and travel motor, are assembled and attached to the crane frame. These carriages allow the crane to move along the tracks and distribute the weight of the crane evenly.
6. Assembly of the Electrical and Control System
Control Panel: The crane's electrical control panel, which includes the wiring, switches, control buttons, and PLC (Programmable Logic Controller) system, is assembled. The control system is responsible for managing the crane's movements, including speed, direction, and lifting.
Power Supply: Electrical connections are made between the crane motor, the control panel, and the power supply. A power distribution system ensures that the crane operates efficiently and safely.
Safety Devices: Safety features, such as overload protection, limit switches, emergency stop buttons, and alarms, are integrated into the control system.
7. Testing and Inspection
Pre-Assembly Testing: Before final assembly, each component of the crane (such as the hoist, trolley, wheels, and motor) undergoes a series of individual tests to ensure proper functionality and quality.
Full System Testing: After the crane is fully assembled, it undergoes a comprehensive testing phase where it is powered up and tested under controlled conditions. The crane's lifting capacity, speed, stability, safety systems, and control responsiveness are tested.
Load Testing: The crane is subjected to a load test to ensure it can lift the rated load safely. During this test, the crane is loaded to its maximum capacity, and all safety systems are verified.
Safety Check: The operation of safety devices, such as emergency stops, limit switches, overload protection, and alarms, is thoroughly checked to ensure that they function correctly.
8. Quality Control and Certification
Final Inspection: Once the crane has passed all tests, it undergoes a final inspection to check for any defects or issues. All components are carefully checked to ensure that they meet the required standards.

Certification: The crane is certified according to relevant standards (e.g., ISO, CE, ASME) to ensure that it complies with safety, performance, and environmental regulations.

Documentation: The crane's documentation, including user manuals, maintenance guides, and warranty certificates, is prepared for the customer.

9. Delivery and Installation
Packaging and Shipping: Once the crane passes all quality checks, it is disassembled (if necessary) and packed for shipping. The components are carefully packed to avoid damage during transportation.

Delivery: The crane is then shipped to the customer's site.

Installation: Upon arrival, the crane is installed on-site, and final adjustments are made. The crane's runway system, control systems, and power supply are connected, and the crane is re-tested in its final installation environment.

Operator Training: The crane operator(s) are trained on how to use the crane safely and efficiently, including operating the control system and understanding the safety features.

10. Post-Installation Support
Commissioning: After installation, the crane undergoes final commissioning, where it is fully integrated into the operational environment. The system is checked again, and any necessary adjustments are made.

Maintenance: The customer is provided with a maintenance schedule and service contract to ensure the crane's continued operation and safety.

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%.