Overhead Crane Suspension Type Overhead Crane

Key Features:

Suspended from Roof: The crane's runway is mounted on the ceiling or roof structure of the warehouse, allowing the crane to move freely without the need for floor-mounted runways or columns.

Underslung Design: The bridge of the crane is underslung, meaning it is suspended from the runways instead of riding on top of them. This allows the crane to travel the full length and width of the workspace while taking up minimal vertical space.

Light to Moderate Loads: Suspension cranes are typically used for handling lighter to moderate loads (generally up to 10 tons), making them ideal for smaller industrial applications or assembly lines where precision and mobility are essential.

Flexible Layout: Because the runways are suspended, these cranes are well-suited for irregularly shaped workspaces or buildings with columns or other floor obstructions. They can cover a large area without interfering with existing equipment or floor space.

Smooth Movement: Like other types of overhead cranes, suspension cranes use electric motors to move the trolley and hoist along the bridge, ensuring smooth and controlled movements.

 

• 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

 

 

1.Bridge

Function: The horizontal beam that spans the width of the workspace. It carries the trolley and hoist, allowing movement of loads from side to side.

Underslung Design: The bridge is suspended beneath the runways, which are mounted on the roof or ceiling structure.

 

2.Runway

Function: The rails or tracks on which the bridge travels. These runways are mounted on the roof or ceiling of the warehouse, as opposed to floor-mounted supports like in top-running cranes.

Suspension System: The runways are suspended from the roof, allowing for more floor space and better adaptability to the building's structure.

 

3.Trolley

Function: A movable unit that runs along the bridge, carrying the hoist. The trolley allows the hoist to move horizontally across the bridge, enabling precise positioning of the load.

Underslung Design: The trolley runs on the underside of the bridge in the suspension crane design.

 

Hoist

Function: The lifting mechanism responsible for raising and lowering the load. It is mounted on the trolley and moves with it across the bridge.

Types:

Electric Chain Hoist: Commonly used for lighter loads, suitable for precision handling.

Electric Wire Rope Hoist: For slightly heavier loads requiring more precision and control.

4. End Carriages

1) End carriages are the components of a steel mill overhead crane that support and guide the crane's trolley along the runway beams. They are located at the outermost points of the overhead crane, and they attach the trolley to the runway beams. The end carriages are responsible for providing longitudinal and lateral stability to the crane, ensuring that it moves smoothly along the rails.

2) End carriages usually consist of a steel frame that is mounted on wheels, and they may be powered or manual. Powered end carriages use a motor to drive the wheels, while manual end carriages are moved by hand. The wheels of end carriages are typically made of steel or polyurethane, and they roll along the runway beams to control the horizontal movement of the crane.

3) In addition to providing stability and guidance, end carriages also support the weight of the crane and the loads it carries. They are designed to be strong and durable, and they must withstand significant forces and stresses during operation. Overall, end carriages are critical components of steel mill overhead cranes, and their performance is essential to ensure safe and efficient operation of these heavy-duty machines.

 

5. Crane traveling mechanism

The crane traveling mechanism refers to the system of components that enable the crane to move horizontally along the steel mill. This system consists of a motor, gears, wheels, and brakes. The motor provides power for the movements of the crane, while the gears and wheels transmit this power to the wheels that are in contact with the steel mill. The brakes are used for controlling the speed and direction of the crane. The traveling mechanism allows the crane to move smoothly and efficiently along the length of the steel mill, ensuring that it can access all parts of the area it is designed to cover.

 

6. Trolley traversing mechanism

1) The trolley traversing mechanism of a steel mill overhead crane is the mechanism responsible for moving the trolley along the bridge of the crane. The trolley is the assembly that holds the hoist and moves along the bridge to position the hoist over the work site.

2) The trolley traversing mechanism consists of a motor, gearbox, and wheels that allow the trolley to move smoothly and precisely along the bridge. The motor provides the power to turn the gearbox which then turns the wheels that move the trolley.

3) The trolley traversing mechanism may also have a brake system to hold the trolley in position when it is not in use. Additionally, the trolley may have a limit switch to prevent over travel and ensure the trolley stays within the operating range of the crane.

4) Overall, the trolley traversing mechanism is a critical component of the steel mill overhead crane, and it should be properly maintained and inspected regularly to ensure safe and reliable operation.

 

7.Crane Wheels

Function: The wheels located in the end trucks, which allow the crane's bridge to travel along the suspended runways. These wheels are typically steel and can be motorized to ensure smooth, powered movement.

Underslung Design: These wheels run on the underside of the runway tracks.

 

8.Load Hook

Function: The hook attached to the hoist that connects to the load or lifting device. The load hook is designed to swivel and allow safe, secure attachment to the material being lifted.

 

9.Electric Motor

Function: Powers the movement of the trolley, hoist, and sometimes the bridge. Electric motors provide the necessary force to control the lifting, lowering, and movement of the load.

Controlled Movement: Motors are essential for ensuring smooth and precise operation of the crane's movement.

 

10. Sound and light alarm system & limit switch

1) A steel mill overhead crane may come equipped with a sound and light alarm system, as well as limit switches for added safety measures.

2) The sound and light alarm system is designed to alert nearby workers or pedestrians of the crane's movements. This is especially important since steel mill overhead cranes are often used in busy industrial settings with heavy foot and vehicle traffic.

3) Limit switches, on the other hand, are safety devices that are designed to prevent the crane from moving beyond a certain point. These switches are typically located at both ends of the hoist or bridge, and when they are tripped, the crane will automatically shut down. This prevents the crane from crashing into other machinery or people, and it can also prevent the load from falling.

4) Overall, these safety features are essential for any steel mill overhead crane, as they help to ensure the safety of workers and prevent accidents from occurring.

 

11. Safety Devices

There are several safety devices that can be installed on a steel mill overhead crane to ensure safety of workers and equipment. Some of the common safety devices include:

 

1) Overload protection: This device is used to ensure that the crane does not lift more weight than its capacity. It is usually installed in the form of load cells, which measure the weight of the load being lifted and automatically cut off the power to the hoist when the weight limit is exceeded.

2) Limit switches: These devices are used to limit the movement of the crane in certain directions, such as preventing the crane from moving beyond the designated limits of the working area. These switches can be installed on the trolley, bridge or hoist.

3) Emergency stop buttons: These buttons are installed at strategic locations throughout the crane system and can be used to shut down the entire system in the event of an emergency.

4) Anti-collision sensors: These sensors help to prevent collisions between the crane and other objects or equipment in the work area. They are typically installed on the crane bridge and/or trolley.

5) Warning lights and alarms: These devices provide audible and visual warnings to alert workers of potential danger, such as when the crane is in motion or the load is about to be lifted or lowered.

6) Steel bumpers: These devices are used to protect the crane and other equipment from accidental collisions. They are usually installed at the ends of the crane bridge and trolley.

 

12. Control Mode

The control mode of a steel mill overhead crane can vary depending on the specific crane and its intended use. However, most modern steel mill overhead cranes utilize a range of control modes to ensure safe and efficient operation.

 

Some common control modes for steel mill overhead cranes include:

1) Pendant control: This type of control involves the use of a handheld pendant that allows the crane operator to control the movement of the crane from a safe distance.

2) Radio control: Similar to pendant control, radio control involves the use of a handheld device to remotely operate the crane. Radio control offers greater mobility and flexibility than pendant control, allowing the operator to move freely around the worksite.

3) Cabin control: Some steel mill overhead cranes come equipped with a cabin or control room where the operator can sit and control the crane. This allows for greater visibility and control over the crane movement.

4) Automated control: In some cases, steel mill overhead cranes are automated, meaning they are programmed to carry out specific tasks without the need for human intervention. Automated control can improve efficiency and safety, but requires careful programming and monitoring to ensure proper operation.

5) Regardless of the control mode used, all steel mill overhead cranes must adhere to strict safety standards and regulations to prevent accidents and injuries in the workplace.

 

13. Sketch

 

 

 

 

A suspension type overhead crane (also known as an underslung crane) offers several advantages, particularly in environments where space optimization and flexibility are critical. Here are the key benefits of using a suspension type overhead crane:

1. Maximized Floor Space

Advantage: Since the crane is suspended from the roof or ceiling, there are no columns or floor-mounted supports, allowing for an unobstructed floor area. This frees up valuable workspace for other equipment, vehicles, or personnel movement.

Application: Ideal for small or crowded workspaces, where maximizing floor space is essential.

2. Optimized Use of Building Height

Advantage: Suspension cranes are suitable for facilities with low ceilings or height restrictions, as they are mounted below the roof structure. This allows for more headroom and flexibility in areas where conventional top-running cranes may not fit.

Application: Warehouses and workshops with low or irregular ceiling heights benefit from this design.

3. Cost-Effective Installation

Advantage: Suspension cranes can be easier and more cost-effective to install compared to top-running cranes, as they do not require additional support columns or reinforced foundations. The structure's existing roof or ceiling is used for support.

Application: Smaller facilities and workshops that do not need to invest in heavy infrastructure for crane installation.

4. Efficient Use of Irregular Layouts

Advantage: Suspension cranes can be installed in buildings with complex layouts or areas where obstacles (such as walls or machinery) prevent the use of floor-mounted systems. They can be customized to fit specific facility layouts, covering awkward or irregularly shaped spaces.

Application: Factories or storage facilities with non-uniform workspaces or areas with obstructions.

5. Easy Integration with Existing Structures

Advantage: Because suspension cranes use the roof structure for support, they can be retrofitted into existing buildings without major modifications. This makes them highly adaptable to a wide range of existing facilities.

Application: Facilities looking to upgrade material handling capabilities without extensive renovations.

6. Improved Safety

Advantage: The crane system is elevated, reducing the risk of accidents related to ground-based obstacles or the movement of forklifts and other equipment. Operators can control the crane safely from a distance, reducing the need for manual lifting and reducing the risk of injury.

Application: Warehouses, production lines, and workspaces with high activity and floor traffic.

7. Precision Handling

Advantage: Suspension cranes provide precise movement for lifting and positioning lighter loads, making them suitable for handling delicate or sensitive materials. The trolley and hoist offer controlled and smooth operation, ensuring accurate load placement.

Application: Industries where precision and careful load handling are critical, such as electronics manufacturing, assembly lines, or packaging facilities.

8. Flexible Layout Design

Advantage: The underslung design allows for flexibility in crane installation and coverage. Suspension cranes can travel over existing workstations, machinery, or storage areas, providing coverage where needed without obstructing ongoing operations.

Application: Custom manufacturing setups or assembly lines with specific workflow requirements.

9. Reduced Structural Requirements

Advantage: Suspension cranes require fewer structural modifications, as the crane relies on the roof structure for support. This reduces the need for additional construction or reinforcement of the building's foundation.

Application: Facilities where structural integrity needs to be maintained with minimal modifications.

10. Light to Moderate Load Handling

Advantage: While these cranes typically handle lighter loads (up to around 10 tons), they are highly efficient for repetitive light to medium-duty lifting operations. This makes them suitable for a wide variety of industries that do not require heavy lifting capacities.

Application: Warehousing, assembly lines, small manufacturing plants, and maintenance workshops.

11. Easy Maintenance and Operation

Advantage: Suspension cranes are generally simpler to maintain due to their lighter design and easy access to components. Operators can use pendant or remote controls for easy operation, and regular inspections ensure smooth performance over time.

Application: Smaller operations where ease of maintenance is a priority, such as small to medium-sized production lines.

12. Enhanced Mobility

Advantage: The crane's ability to move freely along the runways allows for efficient movement of materials across a broad area without floor-based obstacles. It can access areas that are difficult to reach with ground-based equipment.

Application: Production facilities or warehouses requiring frequent movement of materials over extended areas.

Summary of Advantages:

Maximized Floor Space: No need for floor-mounted supports.

Adaptability: Works well with low ceilings and irregular layouts.

Cost-Effective: Easier to install with fewer structural modifications.

Improved Safety: Reduced ground-level hazards.

Precision: Ideal for light to moderate load handling with accurate positioning.

In conclusion, suspension type overhead cranes offer significant advantages in terms of space optimization, flexibility, cost-effectiveness, and safety. They are particularly well-suited for environments that handle light to moderate loads and require efficient, precise material handling.

 

 

Suspension type overhead cranes (underslung cranes) are widely used across various industries due to their adaptability, space-saving design, and efficiency in handling light to moderate loads. Below are some of the key applications where suspension type overhead cranes are commonly employed:

1. Manufacturing and Assembly Lines

Application: Suspension cranes are used to move parts and materials along production lines. They provide flexibility in transporting components for assembly, machining, or inspection, making the manufacturing process more efficient.

Examples: Automotive manufacturing, electronics assembly, and precision part fabrication.

2. Warehouse and Storage Facilities

Application: In warehouses, suspension cranes handle the loading, unloading, and movement of materials to and from storage racks. They maximize vertical space without taking up valuable floor space, improving overall inventory management.

Examples: Warehouses for industrial goods, retail products, or raw materials storage.

3. Logistics and Distribution Centers

Application: Suspension cranes help manage large loads such as pallets, crates, and bulk materials in distribution centers. They streamline the material flow by efficiently moving items between storage areas and loading docks.

Examples: E-commerce fulfillment centers, logistics warehouses, and cargo distribution terminals.

4. Workshops and Maintenance Areas

Application: Workshops that repair or maintain machinery and equipment often use suspension cranes to lift and move parts or equipment. They provide precise control and help position heavy components during assembly or repair.

Examples: Equipment repair shops, automotive repair centers, and industrial maintenance facilities.

5. Aerospace and Aircraft Maintenance

Application: In the aerospace industry, suspension cranes are used to lift and position large, delicate components like fuselages, wings, and engines during aircraft assembly or maintenance. The crane provides precise movement and helps avoid damage to sensitive parts.

Examples: Aircraft assembly lines, aerospace component manufacturing, and aircraft maintenance hangars.

6. Small-Scale Manufacturing

Application: For light-duty manufacturing applications, suspension cranes are used to lift and move materials between different workstations. They provide cost-effective solutions for small factories that do not require heavy-duty lifting equipment.

Examples: Furniture manufacturing, textiles, and small metalworking plants.

7. Automotive Industry

Application: In the automotive industry, suspension cranes are used in vehicle assembly lines to lift car parts like engines, transmissions, and frames. They provide efficient movement and positioning, facilitating the assembly process.

Examples: Car assembly plants, bus or truck manufacturing, and component production facilities.

 

 

The steel mill overhead crane production procedure involves several steps, including:

1. Design and engineering: The first step in the production procedure involves the design and engineering of the crane. This includes determining its capacity, size, and other specifications based on the requirements of the customer.

2. Material procurement: Once the design is finalized, the materials required for the crane are procured. This includes steel plates, beams, cables, motors, and electrical components.

3. Cutting and shaping: The steel plates and beams are cut and shaped to the required size using CNC plasma cutting machines, shearing machines, and other equipment.

4. Welding: The different components of the crane are welded together using MIG and TIG welding processes. The welds are inspected for quality and strength.

5. Assembly: The different components of the crane are assembled together, including the hoist, trolley, bridge, and end trucks.

6. Painting and coating: The crane is painted and coated to protect it from corrosion and other environmental factors.

7. Electrical installation: The electrical components of the crane, such as the control system and motor, are installed and tested.

8. Load testing: Once the crane is fully assembled, it is loaded with weights to test its capacity and performance.

9. Final inspection and delivery: The crane undergoes a final inspection to ensure that it meets all safety and quality standards. It is then packed and delivered to the customer.

 

 

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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