Double Girder Bridge

 

1.A Double Girder Bridge is a type of bridge that uses two parallel beams or girders to support the weight of the bridge deck and any traffic that passes over it. This design is commonly used for medium-span bridges, typically ranging from 50 to 150 meters in length, and is particularly effective for carrying heavy loads.The most 2.distinctive feature of a Double Girder Bridge is its use of two primary load-bearing beams, which run parallel to each other along the length of the bridge. These girders can be made of steel, concrete, or a combination of both materials.

Max. Lifting Height：7.5m, 10M, 15M

Warranty：1 Year

Weight (KG)：11800 kg

Rated Lifting Moment：Different

Max. Lifting Load：400 ton

Span：10.5-31.5m

Crane control mode: Floor control / Remote control / Cabin room

Whole set crane

A whole set crane of a Double Girder Bridge typically refers to a complete system or assembly that includes all the necessary components for lifting and moving heavy objects, such as beams or other structural elements, during the construction or maintenance of a Double Girder Bridge. This type of crane is specifically designed to handle the size, weight, and configuration of the dual girders used in the bridge's structure.

Key Components of a Whole Set Crane for Double Girder Bridges: Lifting Mechanism: This includes one or more hoists or winches that are capable of lifting the heavy loads involved in bridge construction. The lifting mechanism is crucial for safely raising and lowering the girders into place.

Running Gear: This component allows the crane to move along the bridge span or approach it from different angles. It may include wheels, tracks, or another type of mobility system depending on the terrain and job requirements.

Boom: The boom is the long arm of the crane that extends horizontally from the crane base. It provides the reach necessary to position girders accurately in their designated locations. And other components.

Main girder

The main beam of the Double Girder Bridge is the key structural component of the crane, which is mainly responsible for carrying and transferring the weight from the lifting object to the entire bridge.

The design and manufacturing quality of the main beam is directly related to the performance and safety of the whole crane. In terms of structure, the main beam of the double-beam bridge crane is usually a box structure, which can provide better bending and torsional performance . The interior of the box main beam is usually composed of upper and lower wing plates, web plates and reinforcing ribs, which are connected by welding to form a strong box structure.

3.In the choice of materials, the main beam uses high-strength steel to ensure that it can withstand a larger load. At the same time, in order to improve the local and overall stability of the main beam, transverse and longitudinal reinforcement plates are installed inside it. These strengthening measures help to disperse stress and reduce deformation and fatigue damage caused by heavy loads.

The production process of the main beam is also very critical, especially the welding process. High quality welding not only ensures the continuity and consistency of the structure, but also prevents stress concentration at the weld. For example, in the welding process, the degree of arch of the main beam is determined by the quartic function curve, which can effectively control the deformation after welding . In addition, the welding quality is further improved by using ceramic liner to realize single-side welding and double-side welding.

4.In summary, the main beam of the double-beam bridge crane needs to be considered in the design and manufacture of a variety of factors, from the structural form to the material selection, and then to the manufacturing process, each step must be strictly controlled to ensure that the final product has sufficient carrying capacity, safety and service life.

3. Lifting System

1.The lifting system of double-beam bridge crane is mainly composed of two parts: lifting mechanism and lifting mechanism transmission, which is responsible for the vertical lifting and falling of heavy objects

2.The following is a detailed introduction to this system:

Transmission principle of lifting mechanism:Power source and transmission: The power of the lifting system comes from the motor, and the power is transmitted to the high-speed shaft end of the reducer through the gear coupling, compensation shaft and brake wheel coupling. This process is the starting point of the lifting system and determines the efficiency and smoothness of the entire system operation.

The function of the reducer is to reduce the high speed of the motor to the speed required by the lifting system. In this process, the reducer not only needs to match the speed, but also needs to provide enough torque to drive the lifting mechanism to ensure that the heavy object can be lifted smoothly.

Drum and wire rope: The power after the reducer treatment, through the inner tooth ring on the drum to the drum group, and then through the wire rope and pulley block to achieve the lifting of the hook. This link is the execution part of the lifting action, which is directly related to the accuracy and safety of the lifting operation.

Lifting mechanism components

Motor and brake: motor as a power source, its performance directly affects the lifting capacity and work efficiency of the crane. At the same time, the brake acts as a safety protection device to ensure that it can quickly stop the lifting action in emergency situations and avoid accidents.

Reducer and coupling: the reducer is used to adjust the motor speed to the speed suitable for lifting, and the coupling is responsible for effectively transferring the power from the motor to the reducer, and then from the reducer to the executive parts, the good cooperation of the two is the key to the smooth operation of the lifting system.

Reel and wire rope: the reel is the retracting device of the wire rope, its design ensures that the wire rope can be wound and unfolded in an orderly manner, while the wire rope is a key component that directly carries heavy loads, and its quality is directly related to the safety of lifting operations.And other components.

3.In addition, when operating a double-beam bridge crane for lifting operations, the operator needs to undergo professional training and master the correct operation methods and safety knowledge. Maintenance personnel need to periodically check and maintain the lifting system, including lubricating, cleaning, and replacing worn parts, to ensure the normal operation of the equipment. When designing the lifting system, it is necessary to consider the specific conditions of the operating environment, such as temperature, humidity, corrosive gases and other factors, and choose the appropriate materials and protective measures.

All in all, the lifting system of the double-beam bridge crane is a crucial part of the entire crane, and every detail of its design, manufacture and use is directly related to the efficiency and safety of the lifting operation. Therefore, whether in the design and selection stage of the equipment, or in the operation and maintenance stage, it is necessary to attach great importance to the quality and performance of the lifting system.

 

4.End Carriages

1.The end beam of the double-beam bridge crane is an important part of the crane, which is mainly responsible for supporting the bridge and achieving smooth operation on the track.

2.In short, the end beam of a double-beam bridge crane plays a crucial role in load carrying capacity and stability. It is designed to fully consider the needs of heavy duty operations, using advanced structural and material technologies to improve the reliability and safety of the equipment. Strict compliance with the relevant specifications during the design and operation can ensure the long-term stable operation of the end beam as well as the entire crane.

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5.Crane traveling mechanism

1.The crane running mechanism of the Double Girder Bridge crane is one of the main moving parts of the crane, which is responsible for the horizontal movement of the whole crane on the track. The design, installation and maintenance of the truck operating mechanism are very important for the stable operation of the crane.

2.In general, the crane operation mechanism of the double-beam bridge crane is a key component of achieving the horizontal movement of the crane. Its design, manufacture and use need to be carried out in strict accordance with the specifications to ensure the performance and safety of the equipment. Operators and maintenance personnel should have professional knowledge and skills to ensure the efficient operation and long-term stability of the equipment.

6.Trolley traversing mechanism

1.The trolley running mechanism of the Double Girder Bridge crane is one of the main moving parts of the crane, which is responsible for the horizontal movement of the whole crane on the track. The design, installation and maintenance of the truck operating mechanism are very important for the stable operation of the crane.

2.In general, the trolley operation mechanism of the double-beam bridge crane is a key component of achieving the horizontal movement of the crane. Its design, manufacture and use need to be carried out in strict accordance with the specifications to ensure the performance and safety of the equipment. Operators and maintenance personnel should have professional knowledge and skills to ensure the efficient operation and long-term stability of the equipment.

7.Crane wheel

1The wheels of the double-beam bridge crane are the key parts of the crane operating mechanism, which are mainly responsible for driving on the track and supporting the weight of the whole machine.

2In short, the wheels of the double-beam bridge crane not only require a high structural strength and durability, but also need to maintain a high degree of accuracy in installation and maintenance. Operators and maintenance personnel should be professionally trained to master the correct operation methods and maintenance skills to ensure the long-term stable operation of the equipment.

 

8.Crane hook

1.The hook of the double-beam bridge crane is an important part of the crane for grasping and lifting goods, and different types of hooks are usually selected according to the lifting weight and use needs.

2.When the motor drives the lifting mechanism, the hook is connected to the pulley block through a steel cable or chain, so as to achieve the function of lifting the goods. The carrying capacity of the hook ranges from a few tons to hundreds of tons, which can meet the needs of various industrial occasions. For example, the main hook weight of the QD100/20 ton double beam hook bridge crane is 100 tons, and the secondary hook weight is 20 tons.

3.When the motor drives the lifting mechanism, the hook is connected to the pulley block through a steel cable or chain, so as to achieve the function of lifting the goods. The carrying capacity of the hook ranges from a few tons to hundreds of tons, which can meet the needs of various industrial occasions. For example, the main hook weight of the QD100/20 ton double beam hook bridge crane is 100 tons, and the secondary hook weight is 20 tons.

 

 

 

9.Motor

1.The motor of the double-beam bridge crane is the power source of the crane, which is responsible for providing power to the various moving mechanisms of the crane. It drives the lifting mechanism, the truck operating mechanism and the car operating mechanism, etc., to ensure that the crane can normally carry out the lifting and horizontal movement of materials.

The electric motor provides the necessary power for the crane by converting electrical energy into mechanical energy. When the motor receives the instruction from the electronic control system, it immediately responds and drives the corresponding mechanical parts. The motor in modern crane often adopts frequency conversion speed regulation technology, and adjusts the speed of the motor by changing the frequency of the power supply to achieve accurate control of the lifting and running speed.

3.In short, the motor of the double-beam bridge crane not only needs to have high performance and high reliability, but also needs to be carefully managed in operation and maintenance. Operators and maintenance personnel should be professionally trained to master the correct operation methods and maintenance skills to ensure the long-term stable operation of the equipment.

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Sound and light alarm system & limit switch

The audible and visual alarm system and limit switch of double-beam bridge crane are the important parts of the crane safety system, which play the role of warning and limiting the moving range to ensure the safety of operation.

Sound and light alarm system

An audible and visual alarm system usually includes an alarm light and an electric bell or buzzer. These devices emit strong sound and light signals during crane operation to alert the surrounding personnel and operators. The audible and visual alarm system is managed by a control unit, which receives signals from the various safety devices of the crane and controls the start and stop of the alarm device.

3.limit switch

The limit switch is usually mechanical and is triggered when a part of the crane moves to a preset limit position. When the limit switch is triggered, it will immediately cut off the power supply to the corresponding moving mechanism, thereby stopping its movement and avoiding exceeding the safe range.

4.In short, in order to ensure the safe operation of the double-beam bridge crane, the correct installation and maintenance of the audible and visual alarm system and the limit switch are crucial. Operators and maintenance personnel should be professionally trained to master the working principles and operation methods of these safety devices to ensure the efficient operation and long-term stability of the equipment.

Safety Devices

Double Girder Bridge Safety Devices:

Safety equipment of Double Girder Bridge crane is an important part to ensure operation safety and prevent accidents. These safety devices have their own unique functions, and together constitute the comprehensive safety protection system of the crane.

The lifting weight limiter is mainly used to prevent the overload operation of the crane and avoid structural damage or overturning caused by overload. When the lifting load exceeds the rated limit, the limiter will automatically cut off the power of the lifting mechanism and stop further lifting. This limiter is particularly important in situations where strict load control is required, such as large material handling or precision equipment hoisting.

The buffer is used to absorb the kinetic energy of the lifting trolley during operation, slow down the impact, and protect the track and body structure. The installation of a buffer at the end of the crane's track or at an important structure can provide a first layer of protection in the event of an unexpected impact, mitigating the consequences of an accident.

In modern high-efficiency warehouses and factories, multiple cranes often move quickly on the same track, which requires anti-collision devices to prevent them from hitting each other. Anti-collision devices usually include sensors and emergency braking systems. When an obstacle or other crane is detected ahead, the system automatically slows down or stops, ensuring a safe distance.

In short, the safety equipment of the double-beam bridge crane covers many aspects such as mechanical, electronic and software control, forming a comprehensive safety protection network. In daily use, operators and maintenance personnel must be professionally trained to master the working principles and maintenance methods of these equipment to ensure the long-term stable operation of the crane.

Control Mode

1The control mode of double-beam bridge crane is mainly divided into two types: cab operation and ground remote control operation, and the suitable operation mode is selected according to different working environment and needs.

2.bridge operation:In the cab, the operator controls the various movements of the crane through joysticks, buttons or touch screens, such as cart walking, car running and hook lifting. This method facilitates direct observation and control of mechanical actions.

Ground remote control:The ground remote control operation usually uses a remote control or control table, and the operator can control the various actions of the crane through wireless signals on the ground. This reduces the risk of operators working at altitude.

4.In short, the control mode of double-beam bridge crane varies due to different application scenarios and operational requirements. Each method has its own unique advantages and applicable conditions, the operator must be professionally trained to master the correct operation methods and safety procedures to ensure the efficient operation and long-term stability of the crane.

 

Sketch

 

 

 

 

 

1.simple instruction

The Double Girder Bridge crane is usually composed of bridge frame, truck operating mechanism, car, electrical equipment and so on. Its structure design is reasonable, easy to manufacture and maintenance. The simple structure not only reduces the production cost of the equipment, but also makes it easy to check and repair in case of failure.

2.Superior performance

The double-beam bridge crane with honeycomb beam design has the characteristics of light weight and large load, and can bear heavy work loads.

Strong wind resistance: Due to its robust design and structure, the double-beam bridge crane has strong wind resistance and is suitable for outdoor work.

3.Widely used

Diverse application environment: double beam bridge crane can be widely used in indoor and outdoor industrial and mining enterprises, iron and steel chemical industry, railway traffic, port terminals and logistics turnover and other places.

Classification of work levels: according to the different frequency of use, it is divided into A5, A6, A7 three work levels, which can adapt to different intensity of the work environment.

4.Energy saving and environmental protection

Energy-saving design: Double beam bridge crane in the operation process of low energy consumption, the use of advanced power system and transmission system, effectively reduce energy consumption.

Low noise: The noise generated during construction and operation is low, which meets the requirements of green construction and has less impact on the surrounding environment.

5.Easy maintenance

Easy maintenance: The number of parts of the equipment is small, spare parts are easy to obtain, and only need to check and replace vulnerable parts regularly.

Long-term durability: high-strength steel is used as the main material, with strong wear resistance and corrosion resistance, and the service life can reach more than 20 years.

6.Operation safety

Multiple protection measures: Equipped with overload limiter, large screen display and various protection devices, further increase the safety during use.

Safety inspection specifications: In order to ensure safe operation, double-beam bridge cranes need to pass strict lifting height limiters, travel limit switches and other safety routine inspections.

 

 

1.Industrial production

Production line handling: The double-beam bridge crane is often used for cargo handling and material replenishment on the production line, which can move raw materials, semi-finished products and finished products from one workstation to another, improving production efficiency and process coherence.

Equipment installation: In the manufacturing industry, it is necessary to install a variety of heavy machinery equipment, such as machine tools, injection molding machines, presses, etc. A double-beam bridge crane can be used to remove these devices from the transport vehicle and place them exactly where they need to be.

2.Logistics warehousing

Cargo stacking and management: Warehouse areas usually require a large amount of cargo stacking and management. The double-girder bridge crane can either unload cargo from the transport equipment and stack it to a designated storage location, or take cargo from the storage area and load it onto the transport equipment.

Container handling: In ports and freight stations, double-beam bridge cranes are used for container handling and stacking, improving the efficiency and safety of cargo handling.

3.Equipment maintenance and overhaul

Auxiliary assembly: The double-beam bridge crane provides the necessary suspension and positioning support during the product assembly process to ensure the accuracy and stability of the product during the assembly process.

Equipment maintenance: In the regular maintenance of plants and equipment, double-beam bridge cranes are used to lift heavy parts and components for easy maintenance and replacement by maintenance personnel.

Special environment application

High temperature and hazardous environment: Double-beam bridge cranes can be used in high temperature or hazardous environments, such as in the iron making shop of a steel plant or the treatment area of a chemical plant. These cranes are designed to resist high temperatures, corrosion and harmful gases.

Outdoor work: Due to its strong wind resistance and rugged design, the double-beam bridge crane is also suitable for outdoor work, such as shipyards, construction sites and mines.

4.Safety and efficiency

Multiple safety measures: equipped with overload limiter, large screen display and various protection devices to increase the safety during use. The operator can operate by remote control or console, reducing the risk of direct contact.

5.High efficiency: The design of the double-beam bridge crane focuses on efficient material handling, which can complete a large number of lifting and handling work in a short time, thereby improving the overall production efficiency.

 

 

1.Design and material selection

Design stage: According to user needs and working environment, design a crane structure that meets the functional requirements and the use environment. This includes selecting the appropriate main and end beam structures and determining the performance parameters of important components such as motors, retarders and brakes.Material selection: High-strength steel is selected as the main structural material to ensure that the crane has sufficient strength and durability. For special environments (such as high temperature or corrosive environments), it is also necessary to choose the corresponding corrosion resistant material.

2.Processing and manufacturing

Machining: The use of advanced mechanical equipment for processing, such as large floor milling and boring machines, gear hobbing machines and vertical lathes, which can accurately process various parts to ensure dimensional accuracy and surface quality.Assembly: The processed parts are assembled according to the design drawings, including the assembly of the bridge, the assembly of the vehicle operating mechanism, the car operating mechanism and the assembly of the lifting mechanism. Each component must be connected and installed in strict accordance with process standards.

3.Surface treatment and corrosion protection

Surface treatment: The steel surface is treated, such as sandblasting, cleaning and phosphating, to remove oxidation, rust and oil in preparation for the subsequent painting process.

Anti-corrosion coating: primer and top paint are sprayed on the surface of the crane to form a protective film to prevent the steel from being directly exposed to the environment, thereby extending the service life of the equipment.

4.Testing and debugging

Load test: After the completion of all assembly, no-load and load tests are carried out to check whether the performance indicators of the crane meet the design requirements. This includes lifting capacity, operating speed, braking performance, etc.

Safety testing: A comprehensive safety inspection of the crane, including overload limiter, travel limit switch, the operation of each transmission mechanism, etc., to ensure that the equipment is safe and reliable in operation.

5.Packaging and transportation

Disassembly and packaging: Due to the large size of the crane, it is usually necessary to disassemble into several parts for separate packaging, focusing on protecting the mechanical surface and precision components.Transport arrangements: According to the customer's location and traffic conditions, choose the appropriate mode of transport (such as land transport, sea transport or rail transport), and take the necessary protective measures to ensure that the crane is not damaged during transport.

 

 

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.

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