Bridge Crane Girder

Double-beam bridge crane is a common large-scale lifting equipment, widely used in factories, warehouses, cargo yards and other places that require large-scale handling and lifting. Its basic structure includes bridge, running mechanism, lifting mechanism and electrical control system.

Its double-beam design enables the crane to carry a large weight, and the common lifting weight range is from 5 tons to 500 tons. The bridge structure enables it to cover a large working range, and the running track of the bridge crane is usually installed on the upper part of the building, saving ground space. This type of crane can achieve high-precision control of the lifting and handling process through an electric control system and precise mechanical design. In addition, it is equipped with a variety of safety protection measures, such as limit switches, anti-collision devices, overload protection systems, etc., to ensure the safety of operators and equipment.

3. Due to the stability and load-bearing capacity of the double-beam structure, it can achieve efficient handling and loading and unloading in heavy operations. This type of crane has a stable structure and durable materials, which is suitable for long-term and frequent use. It can be customized according to different working environments and needs. In general, double-beam bridge cranes have become an indispensable and important equipment in industrial production due to their excellent load-bearing capacity and wide range of applications.

Warranty of core components：1 Year

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

Warranty：1 Year

Weight (KG)：30000 kg

Feature：Bridge Crane

Condition：New

Max. Lifting Load：5-30 t

Span：10.5 - 31.5 m

Type：Double Beam Electric Bridge Crane

 

 

1.Main beam

1) The main beam is usually made of high-strength carbon steel or low-alloy steel, with good mechanical properties and strong durability. This steel can maintain structural stability when bearing heavy objects and is not easy to deform or damage during use.

2) Box beams are common in heavy cranes. The box structure is a closed box structure welded by two upper and lower plates and two left and right plates, with higher bending and torsional strength. This design is suitable for large spans and large loads and has strong stability. I-beams are commonly used in light and medium-sized cranes. The I-shaped structure is light in weight and has a low manufacturing cost. It is suitable for medium spans and lighter loads.

3) The main function of the main beam is to carry the lifting mechanism (such as an electric hoist or winch) and the materials it lifts. It must have sufficient strength and rigidity to ensure that it does not bend or deform under load. The top of the main beam is usually equipped with a driving track for the trolley to move laterally on it. The flatness and accuracy of the track directly affect the smoothness and work efficiency of the trolley. The main beam is connected to the end beam of the crane by welding or bolts to form an integral frame structure, ensuring the longitudinal and lateral stability of the crane.

Lifting System

1) Characteristics of the lifting system

High efficiency: Through the optimized transmission system and efficient motors, the lifting system can achieve efficient material handling with low energy consumption.

Precise control: Modern lifting systems usually use control devices such as frequency converters, which can accurately adjust the lifting speed and position to achieve smooth lifting and avoid cargo shaking.

Safety: The configuration of multiple safety devices, such as limit switches, brake systems and overload protection devices, ensures the safe operation of the system under any working conditions.

Durability: The components in the lifting system, such as drums, wire ropes, hooks and motors, are durable and made of high-strength materials, and can work stably under long-term high loads.

2) Maintenance of the lifting system

In order to ensure the long-term stable operation of the lifting system, regular maintenance and care are very important. Maintenance includes:

Wire rope inspection: Regularly check the wear and fatigue of the wire rope, and replace the severely worn wire rope in time.

Lubrication and maintenance: The transmission parts such as drums, bearings, gears, etc. need to be regularly filled with lubricating oil to reduce friction loss.

Braking system test: Regularly test the performance of the braking system to ensure that it can work reliably in emergency situations.

Electrical system inspection: Check the connection status of the electrical control system to ensure accurate transmission of control signals.

 

End carriage

The structure of the end beam is relatively simple, but its load-bearing function is very critical. It usually consists of the following parts:

Main beam connecting plate:

The end beam is fixedly connected to the main beams on both sides, usually by welding or bolting to ensure its firmness and stability.

Wheel set:

One or both sides of the end beam are equipped with wheels, which are usually made of steel and installed on the track to ensure that the crane can run smoothly along the track. The wheels are fixed to the end beam through bearings and driven by an electric motor.

Drive device:

The drive device on the end beam usually includes an electric motor and a reducer, which is responsible for driving the wheels on the end beam to move the crane's trolley longitudinally along the track.

Buffer device:

Buffer devices are usually installed at both ends of the end beam, mainly used to buffer and reduce shock when the crane approaches the end of the track or an accidental collision occurs, reducing structural damage.

 

 

4.Crane travelling mechanism

1) Working principle of the crane running mechanism

When the crane running mechanism starts, the motor drives the reducer, and the reducer drives the wheel to rotate through the transmission shaft. The wheel rolls on the track, thereby realizing the longitudinal movement of the crane. The operation of the motor is regulated by the control system, and the operator can adjust the travel speed, start and stop and direction of the crane through the control panel or remote control.

2) Characteristics of the trolley running mechanism

Strong carrying capacity: The crane running mechanism usually has a strong carrying capacity and can support the weight of the entire crane and the materials being transported. This requires the wheels and tracks to have extremely high strength and wear resistance.

High stability: Thanks to the frequency conversion control technology and high-precision reducer, the crane can start and stop smoothly and reduce load shaking.

High efficiency: The operating mechanism is reasonably designed and can carry out material handling with high efficiency, reducing operation time and improving work efficiency.

Safety: The crane running mechanism is equipped with a variety of safety protection devices, such as limit switches, buffer devices, braking systems, etc., to ensure the safety of the equipment during operation.

5.Trolley travelling mechanism

The trolley running mechanism consists of several key components that work together to ensure the smooth operation of the trolley on the main beam. Its main components include:

1) Drive device: The trolley's drive device usually consists of an electric motor, a reducer and a drive shaft. The electric motor provides power for the operation of the trolley, and the reducer converts the high-speed output of the electric motor into a low-speed, high-torque output suitable for the smooth movement of the trolley.

2) Wheel set: The trolley moves on the main beam track through the wheel set. The wheels are usually divided into active wheels and driven wheels. The active wheels are driven by the motor, while the driven wheels rotate freely to reduce friction and load. The wheels are mostly made of steel or wear-resistant materials to ensure long-term high-load operation.

3) Track system: The trolley runs on the track on the crane main beam. The track is usually a steel rail or guide rail installed on the main beam. It has sufficient strength and rigidity to support the weight of the trolley and the materials it carries.

4) Lifting mechanism: The trolley is also equipped with a lifting mechanism, which includes devices such as electric hoists or winches, responsible for the vertical lifting of materials. The lifting mechanism and the trolley running mechanism work closely together to achieve accurate material handling.

5) Limiting device: In order to prevent the trolley from exceeding the safety range, a limit switch or mechanical limiting device is usually installed on the trolley running mechanism to prevent the trolley from overrunning or colliding.

6) Buffering device: In order to prevent the trolley from colliding at the end point, a buffering device is usually installed at the end of the trolley or at both ends of the main beam to absorb the impact force.

6.Crane wheel

Design requirements for wheels

1) Strength and wear resistance: The wheels must be strong enough to carry the weight of the crane and its load. The contact surface of the wheel should have high wear resistance to reduce wear in long-term use and extend its service life.

2) Impact resistance: The wheels will be subjected to various impact loads during the operation of the crane, especially during starting and braking, so they need to have good impact resistance.

3) Dimensional accuracy: The diameter, width and flange height of the wheel must be precisely matched to the track to ensure close contact between the wheel and the track and maintain smooth operation. Too large or too small flanges can cause the wheel to derail or increase friction.

4) Bearing design: The bearings of the wheel need to have good load-bearing capacity and low friction characteristics to ensure smooth operation of the wheel on the track.

7.Crane Hook

According to different usage requirements, hooks can be divided into many types:

Single hook:

The single hook has a simple structure and flexible operation, which is suitable for small and medium-sized lifting operations. The single hook has a relatively low load capacity and is suitable for applications with a small lifting capacity.

Double hook:

The double hook has a large load capacity and is often used for lifting heavy materials. The double hook structure can evenly distribute the load and is suitable for large-tonnage lifting equipment.

Rotating hook:

The rotating hook can rotate 360 degrees, which is convenient for flexibly adjusting the direction of the object during the lifting process, especially suitable for lifting operations that require frequent steering.

Motor

In order to ensure the normal operation of the motor and extend its service life, the maintenance of the motor is very important. Common maintenance measures include:

1) Regularly check the insulation performance of the motor: Poor insulation may cause the motor to short-circuit or leak, affecting safe operation.

2) Clean the surface of the motor: After the motor is used for a long time, dust easily accumulates on the surface, affecting the heat dissipation effect. It should be cleaned regularly to maintain good heat dissipation of the motor.

3) Check the bearings: The motor bearings are high-wear parts and need to be checked and lubricated regularly to reduce friction and prevent excessive wear of the bearings.

4) Check the electrical connection: The electrical wiring of the motor needs to maintain good contact. Check the wiring regularly to see if it is loose or aging to prevent electrical failures.

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Sound and light alarm system & limit switch

1) Sound and light alarm system

Operation status reminder: When the crane is running, the sound and light alarm system will issue a continuous or intermittent sound alarm, accompanied by flashing lights, to remind people around to stay alert.

Abnormal status alarm: When the crane fails, is overloaded or in other abnormal situations, the sound and light alarm system will immediately sound an alarm to remind the operator to check the equipment status and take corresponding measures.

Danger warning: When the crane is starting, stopping or moving, the sound and light alarm system will warn the on-site personnel to prevent them from approaching the dangerous area.

2) Limit switch

Position limit: The limit switch is used to limit the maximum running distance of the crane trolley, car or hook to prevent it from crossing the track or working range.

Collision prevention: The limit switch prevents the trolley or trolley from colliding with the terminal buffer device or obstacles to protect the equipment and the surrounding environment.

Over-lift or over-drop protection: When the hook rises or falls beyond the preset height or low, the limit switch will automatically stop lifting or lowering to prevent the wire rope from over-winding or over-releasing, and avoid the hook from falling or being damaged.

10.Safety Devices

1) Overload protection device

The overload protection device is used to monitor the load of the crane and prevent overload operation. Its functions include: load sensor, real-time monitoring of the lifting weight, and automatic stop of the crane when overloaded. Alarm device, sound and light alarm in overload condition to remind the operator.

2) Emergency stop device

The emergency stop device can quickly stop the operation of the crane in an emergency to avoid accidents. The emergency stop button is set in the crane cab and key positions, and the operator can quickly press it to stop the operation of the crane. The emergency stop switch is set on the control panel of each moving mechanism of the crane, which is convenient for the operator to stop the equipment immediately in an emergency.

3) Electrical protection device

The electrical protection device ensures the safety of the crane's electrical system and prevents accidents caused by electrical failures.

4) Braking system

The braking system is an important device to ensure that the crane can stop safely during operation. The main brake is used to control the main movement of the crane to ensure that the equipment can stop safely. The auxiliary brake provides additional braking support to ensure safety when the main brake fails.

5) Anti-collision device

The anti-collision device is used to prevent the crane from colliding with other equipment or obstacles during operation. Photoelectric sensors detect the surroundings of the crane and automatically stop the movement of the equipment when an obstacle is detected. The contact anti-collision switch triggers the switch to stop the operation of the equipment when the crane contacts an obstacle.

6) Safety guardrails

Safety guardrails are used to protect the safety of operators and prevent accidental falls or entry into dangerous areas. Guardrails are set at the edges of the crane cab and operating platform to ensure the safety of operators. Safety nets are set in the working area of ​​the crane to prevent objects from falling or people from falling.

11.Control Mode

1) Manual control

Manual control is the most traditional control method. The operator directly controls the various actions of the crane through a joystick or button. It is simple to understand and easy to operate. The equipment has low cost and is easy to maintain.

2) Wireless remote control

The wireless remote control system realizes remote operation of the crane through wireless signal transmission. The operator uses a handheld remote control for control. The operation is flexible and can operate the equipment at a safe distance to avoid potential dangers. The operator can better observe the on-site situation and improve the safety of the operation.

3) Wired control

Wired control connects the control panel of the crane and the operator through a cable, enabling it to control the various actions of the crane. The control is stable and is less affected by external interference. It is not limited by battery or signal problems, ensuring long-term reliable use.

4) PLC automation control

PLC (Programmable Logic Controller) automation control system programs the control logic and uploads it to the PLC to automatically control various operations of the crane. The control accuracy is high and complex operation logic and automation processes can be realized. It reduces the labor intensity of the operator and improves work efficiency. It can realize functions such as timing control and counting control, and adapt to a variety of working environments.

5) Frequency conversion speed control

The frequency converter controls the motor speed and adjusts the crane's movement speed and acceleration and deceleration characteristics. This improves the crane's operating stability and reduces mechanical shock. The speed can be flexibly adjusted according to work requirements, which improves work efficiency. This reduces power consumption and extends the service life of the equipment.

12.Sketch

Main technical

 

 

1. Strong carrying capacity

The structural design of the double-girder bridge crane enables it to withstand greater loads and is usually suitable for occasions that require heavy handling. Due to the double-girder design, the overall rigidity of the crane is better and it can lift heavier objects.

2. High stability

The double-girder structure provides better stability and anti-overturning ability. Under high load conditions, the double-girder bridge crane can maintain a good balance and reduce the risk of overturning.

3. Smooth operation

The double-girder bridge crane is designed with a sophisticated track and wheel system, which makes it more stable during operation, reduces vibration and noise, and helps improve work efficiency and safety.

4. Wide operating range

This type of crane can operate in a larger working space and is usually suitable for large factories, warehouses, docks and other places. It can cover a larger area and reduce the need for other equipment.

5. Strong flexibility

The double-girder bridge crane has flexible and diverse operating methods and can be equipped with various hoists and accessories to meet different lifting operation needs. In addition, some models can also achieve multiple control methods, such as manual, wireless remote control or automatic control.

6. Low maintenance cost

The design structure of the double-beam bridge crane is relatively simple, and maintenance and overhaul are relatively easy. Regular maintenance can effectively extend the service life of the equipment and reduce the long-term use cost.

7. High safety

Modern double-beam bridge cranes are equipped with a variety of safety devices, such as limit switches, overload protection, sound and light alarms, etc., which can effectively ensure the safety of equipment and operators and reduce the risk of accidents.

8. Strong adaptability

Double-beam bridge cranes can be customized according to actual needs and can adapt to different working conditions and environments, such as working under harsh conditions such as high temperature and high humidity.

 

 

1) Heavy machinery manufacturing: used for assembly, handling and testing of heavy machinery and equipment, such as large machine tools, generator sets, etc.

2) Cargo handling: In large warehouses and logistics centers, double-beam bridge cranes can be used to handle and stack various goods, especially heavy and large items.

3) Loading and unloading operations: In docks and container yards, double-beam bridge cranes are widely used for loading and unloading of containers to improve operating efficiency.

4) Steel mills: used to handle bulk raw materials such as iron ore, scrap steel and finished steel, with strong load-bearing capacity and adaptability to harsh working environments.

5) Site handling: At construction sites, double-beam bridge cranes can be used to handle precast concrete parts, steel bars and other heavy building materials.

6) High-rise buildings: In high-rise building construction, double-beam bridge cranes can provide efficient material handling solutions.

7) Spacecraft manufacturing: used to handle large spacecraft and related components, meeting the requirements of high precision and high safety.

8) Ore handling: In mining, double-beam bridge cranes are used to handle ore and other heavy equipment, adapting to harsh working environments.

9) Experimental equipment handling: In large laboratories and research institutions, it is used to carry heavy experimental equipment and materials to ensure the smooth progress of the experiment.

 

 

1. Demand analysis and design: Communicate with customers to understand their specific needs, including the specifications, loads, working environment, etc. of the crane. Carry out preliminary design according to customer needs to determine the structure, materials and main technical parameters of the crane. Complete detailed design drawings, including the design of various components such as the main beam, end beam, trolley, hook, motor, etc.

2. Material selection: Select appropriate materials according to design requirements. Commonly used materials include steel, aluminum alloy, etc. to ensure sufficient strength and durability. Carry out quality inspection on purchased materials to ensure compliance with relevant standards and requirements.

3. Processing and manufacturing: Cut large pieces of steel into the required length and shape. Bend and weld the cut materials to form the basic structure of the main beam and end beam. Process the various components of the trolley according to the design drawings to ensure coordination with the main beam and end beam. Manufacture hooks and motors to ensure that they meet design requirements and safety standards.

4. Welding and assembly: Weld the various components to form a complete structure of the main beam, end beam, trolley, etc. The welding process needs to ensure the quality and strength of the weld. Assemble the welded parts to form a complete double-beam bridge crane. Including connecting the main beam and the end beam, and installing the trolley and the main beam.

5. Electrical installation: Install electrical equipment such as motors, control systems, sound and light alarm systems, and limit switches. Carry out wiring of electrical lines to ensure that the electrical system is safe, reliable, and in compliance with relevant standards.

6. Debugging and testing: Perform preliminary debugging of the crane and check whether the installation and connection of each part are correct. Perform comprehensive functional tests, including inspections of various functions such as lifting, walking, braking, and limiting. Perform load tests under safe conditions to verify the working performance of the crane under maximum load.

7. Quality inspection: Perform strict quality inspections on each component and the entire crane to ensure that it meets the design standards and quality requirements. Record the inspection results and make relevant filings to ensure traceability.

8. Delivery and installation: Pack the qualified cranes and prepare them for transportation to the customer site. Install and debug the crane at the customer site to ensure its normal operation. Train the customer's operators to teach operation, maintenance, and safety precautions.

9. After-sales service: Provide necessary after-sales support, including regular maintenance, troubleshooting and spare parts supply, to ensure the long-term and stable operation of the crane.