Crane Bridge Girder

 

 

Crane Bridge Girder are composed of main beams, end beams, lifting mechanisms (usually electric hoists), electrical control systems, operating mechanisms, etc. The overall structure is compact and can run smoothly on the tracks on both sides of the factory or warehouse, covering the entire operating area. This equipment is suitable for production workshops and storage environments that need to frequently carry light materials.

Crane Bridge Girder have a simple structure, simple manufacturing process, and convenient maintenance. Its lightweight design can reduce the load-bearing requirements of the factory and is suitable for use in small and medium-sized factories. It can be controlled by ground handles, wireless remote controls or cabs, and the operation is convenient and flexible to adapt to different operating needs. Cranes usually use variable frequency speed regulation technology, which can start and stop smoothly, reduce impact on equipment, reduce energy consumption, and improve work efficiency. Due to the single-beam design, its structure is compact and occupies less vertical and horizontal space, which is suitable for use in low factories or environments with limited space. Equipped with multiple safety protection devices, such as limit switches, overload protection, and sound and light alarm systems to ensure the safety of the operation process.

3) Single-girder bridge cranes can be customized according to the specific needs of customers, including different lifting weights, spans, lifting heights, and special functions (such as explosion-proof design, outdoor windproof design, etc.). The manufacturer will design and manufacture according to the customer's site conditions, usage requirements and process flow to provide the most suitable solution.

 

Warranty：1 Year

Weight (KG)：4895 kg

Feature：Bridge Crane

Condition：New

Rated Lifting Moment：customizable

Max. Lifting Load：32 tons, Any weight! lifting weight is customizable

Span：7.5-31.5m,customizable

Voltage：220V/380V/415V or according to your demand

Application：Widely manufacture plant

Lifting mechanism：Wire Rope Electric Hoist

Lifting Capacity：Customized

Control Method：Ground+Remote Control

Lifting Height：Customized

 

 

 

1.Main beam

1) The main beam usually adopts a box-shaped structure, which has high bending strength and torsional rigidity and can withstand large loads. The box-shaped main beam is welded from steel plates into a closed rectangular or square section, with high strength, suitable for heavy loads and large spans. The main beam of some light Crane Bridge Girder adopts I-beam or H-beam structure, which is suitable for small and medium-sized lifting weights and spans. This structure is simple and light, suitable for cost-controlled projects.

2) The main beam usually adopts high-quality carbon steel or low-alloy steel, with high strength, good weldability and durability, and can withstand heavy loads and frequent use. For specific applications, such as outdoor or corrosive environments, the main beam material can be treated with special anti-corrosion treatment or coating to enhance its durability and fatigue resistance.

3) The design of the main beam should be optimized according to the parameters of the crane's lifting weight, span, operating frequency, etc. to ensure sufficient load-bearing capacity under the rated load. In order to ensure that the crane remains stable during operation, the design of the main beam needs to consider the bending and torsional properties to avoid excessive deformation affecting the operation of the trolley. The main beam usually adopts high-quality welding technology to ensure the strength and stability of each weld. Common welding methods include gas shielded welding, arc welding, etc.

4) During the installation of the crane, the main beam is connected to the end beam by bolts or welding to form an integral frame. The quality and accuracy of the connection are crucial to the smooth operation of the whole machine. The upper or lower part of the main beam is usually equipped with a running track for the trolley, on which the trolley moves horizontally to achieve accurate material handling.

 

 

Lifting System

1. Working principle of the lifting system

The lifting system drives the drum or sprocket through the motor, driving the winding and loosening of the wire rope or chain, and then controlling the lifting and lowering of the hook. When the operator issues a command through the handle or wireless remote control, the motor starts, transmits power through the reducer, and the drum rotates to tighten or loosen the wire rope, thereby realizing the vertical lifting or lowering of the object.

2. Maintenance and care

The daily maintenance and care of the lifting system is crucial to extend the service life of the equipment and ensure the safety of the operation.

Inspection and replacement of wire ropes or chains: Regularly check the wear, broken strands and deformation of wire ropes or chains, and replace them when necessary.

Lubrication of motors and reducers: The gears inside motors and reducers need to be lubricated regularly to ensure smooth operation and reduce wear.

Brake maintenance: Check the sensitivity and wear of the brakes to ensure that they can work effectively in emergency situations.

 

3.End carriage

The end beam is generally made of steel, with a strong and durable structure. It is usually connected to the main beam by bolts or welding, and connected to the wheels of the crane running mechanism to ensure the smooth movement of the crane. The main components include:

1) Steel structure beam: The end beam body usually adopts a box-shaped or I-shaped steel structure with sufficient bending and torsion resistance to support the weight of the main beam and its load.

2) Running wheels: Wheels are installed at both ends of the end beam, and the wheels run along the track to drive the crane's trolley to run. Common wheels are cast steel or forged steel wheels, which have high strength and wear resistance.

3) Drive device: Sometimes the end beam is also equipped with a drive motor and a reducer to directly drive the wheels to move the crane on the track.

 

4.Crane travelling mechanism

Design features of crane running mechanism

1) High-strength wheels:

The wheels of the crane running mechanism are usually made of high-strength cast steel or forged steel, which are quenched and tempered to have high wear resistance. The wheel shape is usually round or double-rim structure to ensure good contact with the track and prevent the crane from derailing or deviating on the track.

2) Precision reducer:

The reducer converts the high-speed rotation of the motor into a low-speed and smooth output suitable for the operation of the crane through a precision gear set, ensuring the smoothness and controllability of the trolley operation. Common types of reducers are worm gear reducers and planetary gear reducers.

3) Variable frequency speed control:

The crane running mechanism of some modern Crane Bridge Girder is equipped with a variable frequency speed control system. By adjusting the speed of the motor through the frequency converter, the operator can flexibly control the operating speed of the crane, which is particularly important in heavy load or precise positioning operations.

 

5.Trolley travelling mechanism

The trolley running mechanism enables the trolley to move in the lateral direction along the main beam track through the coordinated work of the drive motor, reducer and wheel group to achieve accurate positioning and handling of the goods.

1) Motor start:

When the operator starts the trolley running mechanism, the motor starts to work, reducing the speed and increasing the torque through the reducer.

2) Transmission system operation:

The motor transmits power to the driving wheel through the reducer and the transmission shaft, and the wheel runs along the track on the main beam.

3) Trolley movement:

Driven by the motor, the trolley frame moves along the track of the main beam together with the lifting mechanism to move the hoist or cargo from one position to another.

4) Limit control:

When the trolley runs to both ends of the main beam, the limit switch is activated to automatically stop the movement of the trolley to prevent the trolley from derailing or colliding.

 

6.Crane wheel

1The wheels of the crane run on the track through the motor drive or driven principle. Its operating principle is as follows:

1) Motor drive:

In the trolley running mechanism or the trolley running mechanism, the motor drives the driving wheel to rotate, generating driving force to make the crane run along the track. The driving wheel transmits the power of the motor to the wheel through the transmission system (such as the reducer) to ensure smooth movement.

2) Wheel rolling:

The wheel rolls along the track, evenly distributing the gravity of the crane on multiple wheels, thereby reducing the bearing pressure of each wheel and ensuring good contact between the wheel and the track.

3) Limit and brake:

When the wheel reaches the limit position of the track, the limit switch is triggered and the wheel stops rolling to prevent the crane or trolley from exceeding the track range. The braking system will start quickly after the operation stops to ensure that the wheel remains in the predetermined position without inertial sliding.

7.Crane Hook

Hooks are usually made of forged high-strength steel, which has sufficient strength and toughness to withstand extremely large loads. According to different shapes and functions, hooks are mainly divided into the following categories:

Single hook: This is the most common type of hook, with a simple structure, suitable for light to medium load operations of small and medium-sized lifting equipment. Single hooks are easy to use and suitable for most general handling scenarios.

Double hook: The double hook design has better load distribution capabilities and is suitable for heavy loads. It can distribute the load more evenly, reduce single-point stress, and improve safety and stability.

Swivel hook: The swivel hook can rotate freely during lifting operations, which is convenient for adjusting the direction of the cargo and reducing the risk of twisting or swinging during lifting. This type of hook is usually equipped with a swivel with a bearing.

Motor

The motors of single-girder bridge cranes are mainly used in the following aspects:

Lifting motor: This is one of the most critical motors of the crane, responsible for lifting and lowering the hook and cargo through wire ropes or chains. The lifting motor needs to have a large torque and starting capacity to cope with the rapid lifting and precise positioning of the cargo. The lifting motor is usually equipped with a brake to ensure that the hook does not slip when it stops.

Trolley running motor: used to drive the crane to move longitudinally along the track. The power of the trolley running motor is transmitted to the trolley wheels through the reducer and transmission mechanism, so that the crane moves smoothly along the workshop or construction site track. The trolley running motor needs to have good braking and acceleration and deceleration capabilities to ensure safe operation.

Trolley running motor: used to drive the trolley to move horizontally on the main beam to help the hook reach the working area accurately. The trolley running motor usually uses a smaller power motor because the load capacity and moving distance of the trolley are relatively small.

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Sound and light alarm system & limit switch

1) Composition of the sound and light alarm system:

Sound alarm: emits a high-decibel sound signal, commonly a buzzer or bell, to alert personnel in the operating environment.

Light alarm: usually a warning light (such as red, yellow or green light), flashing to warn.

Control module: connected to the crane's operating system through a control circuit. When the crane is in a specific state (such as operation, limit or failure), the control module activates the alarm signal.

2) The role of the limit switch:

Prevent over-limit operation: prevent the crane's hook, trolley or car from exceeding the designed safe operating range, and avoid collision or derailment between the equipment and the structure.

Automatic protection equipment: After the limit switch is triggered, the equipment will automatically shut down without manual intervention by the operator, effectively avoiding the danger caused by misoperation.

Improve operating accuracy: The limit switch can help the operator accurately control the movement of the crane, especially in operations with delicate lifting or high safety requirements.

10.Safety Devices

1) Overload protection device

The overload protection device is one of the core safety devices of the crane. It senses the hoisting weight to ensure that the hoisted items do not exceed the maximum load capacity of the crane. The main function of the overload protection device is: when the lifting weight exceeds the set safety value, the device will automatically issue an alarm to prompt the operator to stop lifting; if the operator ignores the warning, the system can automatically stop the operation of the crane to prevent overload operation from causing equipment damage or falling accidents.

2) Anti-collision device

Anti-collision devices are usually used when multiple cranes are operating on the same track to prevent two cranes from colliding during operation. The device monitors the distance between the cranes through sensors. When the two cranes approach, the system will automatically slow down or stop to ensure a safe distance.

3) Buffer

The buffer is installed at the end of the operation of the trolley and the car. When the crane or trolley approaches the end of the track or other equipment, the buffer will absorb the impact force to prevent the equipment from being seriously damaged by collision. Buffers are usually divided into spring buffers and hydraulic buffers, which can effectively reduce the impact and wear of mechanical parts.

4) Brakes

Brakes are used to control the stopping and keeping stillness of the crane's moving parts (such as hooks, carts, and trolleys). Common types of brakes include electromagnetic brakes and hydraulic brakes. They can quickly stop the running parts in the event of a power outage or emergency to prevent the hook or cargo from falling freely. In addition, the brakes ensure that the equipment can maintain its position stably when it stops operating to avoid accidental movement of the cargo.

5) Emergency stop button

Crane Bridge Girder usually have an emergency stop button on the control panel. During operation, if the equipment is found to be abnormal or an emergency occurs, the operator can press the emergency stop button to immediately cut off the power supply and stop the operation of the crane to ensure the safety of the equipment and personnel.

11.Control Mode

1) PLC control system

PLC (Programmable Logic Controller) control system is an advanced automation control method that achieves precise control of each action of the crane through programming. The PLC system can automatically perform hoisting operations according to pre-set programs, and is usually used in situations that require high-precision control or complex processes.

2) Frequency conversion control

Frequency conversion control is a modern control method that mainly adjusts the motor speed of the crane through a frequency converter to achieve precise control of the trolley, trolley and lifting speed. Frequency conversion control can achieve smooth starting, deceleration and parking, effectively reduce mechanical shock and shaking, and improve the accuracy and safety of operation.

3) Cab control

Cab control is suitable for large-span, high-frequency, and heavy-load working environments. The operator of the crane is located in the cab installed on the main beam and controls the movement of the crane through joysticks, buttons, etc. This method is usually used in heavy industry or large-scale production situations.

4) Ground control

Ground control is to control the operation of the crane on the ground through an operating panel or button station. This method usually completes the operation of the crane through buttons, handles or foot switches, and is suitable for simple hoisting operations.

5) Wireless remote control

Wireless remote control is a widely used control method. The operator remotely controls various operations of the crane through a wireless transmitter. Wireless remote control systems are usually used in situations where the operator needs to keep a certain distance from the crane, especially in high temperature, polluted, and dangerous environments.

Sketch

 

 

 

 

Simple structure and convenient maintenance: The single-beam bridge crane adopts a single main beam structure, with a simple structural design and relatively few parts, so installation, repair and maintenance are easier. The simple structure not only reduces the maintenance cost of the equipment, but also reduces the possibility of failure.

Light weight and reduced building pressure: The single-beam bridge crane has a relatively light weight, which can reduce the pressure on the factory or building structure. Especially for workshops or warehouses that require the load-bearing capacity of the building structure, the single-beam bridge crane is an ideal choice.

Strong economy: Due to its simple structure and less materials, the manufacturing cost of the single-beam bridge crane is relatively low, which is particularly suitable for small and medium-sized enterprises or light industries. In addition, the operation and maintenance costs are low, making it very cost-effective.

Convenient installation and small space occupation: The installation process of the single-beam bridge crane is relatively simple and quick, and the factory height and space occupied are small, which is very suitable for occasions with limited factory space. In addition, its main beam design is compact, and limited space can be used for effective lifting operations.

5) Efficiency and precision: Single-girder bridge cranes can achieve precise lifting operations through modern control systems (such as frequency conversion control, PLC control), and reduce the shaking of goods during lifting through smooth acceleration and deceleration functions, thereby improving work efficiency and lifting accuracy.

 

 

1) Manufacturing: Crane Bridge Girder play an important role in the manufacturing industry, especially in the production lines of various factories. They are used to transport and lift raw materials, semi-finished products and finished products, helping to automate and improve the efficiency of production processes.

2) Warehousing and logistics: In the field of warehousing and logistics, Crane Bridge Girder help to transport, load and unload and store various goods, improving the material turnover efficiency of warehouses.

3) Construction: Crane Bridge Girder are mainly used for lifting construction materials, equipment, etc. in construction. In some construction workshops or outdoor temporary operations, it is an ideal choice for small and medium-sized construction projects.

4) Metallurgical industry: In the metallurgical industry, Crane Bridge Girder are used to lift and flip heavy metal materials, plates, coils, etc., and are often used in the work process of processing workshops.

5) Power industry: In the production workshops or substations of the power industry,Crane Bridge Girder are used to install, repair and maintain power equipment to ensure the safe operation of the equipment.

6) Chemical Industry: In the chemical industry, single-girder bridge cranes are used to lift chemical raw materials, equipment and semi-finished products, especially in dangerous and complex environments. They are remotely controlled to ensure the safety of operations.

7) Papermaking Industry: In the papermaking industry, single-girder bridge cranes are used to transport paper rolls, paper and related production equipment, especially in large-scale production processes, which can help improve production efficiency.

 

 

1) Design and Planning:Communicate with customers to determine the lifting weight, span, lifting height, running speed and other parameters of the crane. Use professional software to design the main beam, end beam, operating mechanism, hook, motor and other components to ensure structural strength and stability.

2) Material Preparation:Prepare the materials required for the production of the crane according to the design drawings. Commonly used materials include steel, motors, reducers, wheels, rails, cables, etc.

3) Steel Cutting and Welding:According to the design drawings, use CNC cutting machines or other cutting equipment to cut steel plates and steel sections to prepare the materials required for the main beam and end beam. The cut steel plates are welded to form a box structure or I-beam. The welding quality requirements are high and the structural strength and stability must be guaranteed. 4) Assembly:Assemble the components such as the motor, reducer, drum and wire rope according to the design requirements. Install the hook, pulley block and wire rope to ensure their safety and load-bearing capacity. Install the cables, electrical components and control box on the crane according to the design requirements to ensure the electrical safety of the system. Install the motor and debug the electrical equipment such as the inverter, remote control and limit switch. Weld and assemble the frame of the trolley and the car, and install the motor, reducer and wheels. Install the drive device of the trolley and the car to ensure the smoothness and accuracy of horizontal movement.

5) Painting and anti-corrosion treatment：Derust all metal surfaces to ensure that the surface is clean and pollution-free. Spray the whole machine with anti-corrosion coating to protect the durability of the crane in harsh environments.

6) Testing and debugging

No-load test: Run the crane for no-load test to check whether all functions are normal, such as lifting, operation, limit devices, etc.

Load test: Perform rated load test and overload test to ensure the stability and safety of the crane in actual use.

7) Quality inspection and acceptance：Carry out a comprehensive quality inspection of the crane's structure, electrical system, safety devices, etc. to ensure that all technical indicators meet the requirements. After installation and commissioning at the customer's site, the customer will accept the equipment to ensure that the equipment meets their needs.

8) Packaging and delivery

Disassemble the main components of the crane, package them separately and take good transportation protection. Arrange transportation to deliver the equipment to the customer's site for on-site installation and commissioning.

 

 

 

 

 

 

Material Inspection

Quality Inspection: Strict quality inspection is carried out on the purchased raw materials to ensure that they meet the design requirements and national standards.

Material Storage: Qualified materials are stored according to classification to prevent corrosion or damage.

Cutting and Forming

Steel Cutting: Use plasma cutting, laser cutting or flame cutting and other technologies to cut the steel according to the size of the design drawing.

Forming Processing: Form the steel plate through bending, rolling, welding and other processes to manufacture the main beam, end beam and other structural parts.

Welding

Component Welding: The cut and formed steel parts are welded into the main structures such as the main beam, end beam and trolley. The welding process needs to be strictly controlled to ensure the structural strength and welding quality.

Weld Inspection: Use non-destructive testing technology (such as ultrasonic testing, radiographic testing) to inspect the welds to ensure that there are no cracks or other defects.

Machining

Precision Machining: Precision machining is performed on the key components of the crane, such as wheel sets, bearing seats, pulleys, etc., to ensure their dimensional accuracy and surface quality.

Assembly of the whole machine

General assembly: On the basis of pre-assembly, the overall assembly of the crane is carried out, including the final installation of the main beam, end beam, lifting mechanism, walking mechanism, etc.

Commissioning and testing

Under dynamic conditions, the operating performance of the crane is tested, including the testing of lifting, walking, steering and other functions. The overall size of the assembled bridge crane is checked to ensure that all dimensions meet the design requirements.

Spraying and anti-corrosion treatment

Surface treatment Rust removal: Rust removal on the surface of the crane, common methods include sandblasting, pickling, etc. Primer spraying: Spray anti-corrosion primer on the treated surface to prevent metal oxidation and corrosion. Topcoat spraying Color spraying: Spray topcoat according to customer requirements or industry standards to give the crane a protective and decorative effect. Marking: After spraying, mark the crane's identification information in accordance with the specifications, such as model, rated load, etc.

Factory and installation

Packaging and transportation

Packaging protection: Protectively package the key components of the crane to prevent damage during transportation. Transportation arrangement: According to the equipment size and transportation conditions, select a suitable transportation method to transport the crane to the customer's site.

Acceptance and delivery

Customer acceptance

On-site acceptance: The customer conducts on-site acceptance of the crane according to the contract requirements and technical specifications to check the performance and quality of the equipment.

Problem rectification: If any problems are found, the manufacturer needs to rectify them in time to ensure that the equipment fully meets the customer's requirements. Delivery and use Operation training: The manufacturer usually trains the customer's operators to ensure that they can operate the crane correctly and safely.

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