Single Girder Overhead Crane

A Single Girder Bridge Crane is a type of overhead crane. It feature end trucks that operate on fixed rails attached to the top flange of runway.The hoists are underhung and ride on the lower flange of the bridge beam. Single girder cranes provide a cost effective alternative to double girders by using single cross girders rather than two girders.These overhead cranes are motorized and typically feature radio controls.

Single Girder Electric Overhead Travelling Crane
The most widely used type of overhead crane, simple structure, easy to install and maintain.A yellow single girder overhead crane labeled DGCRANE with a capacity of 10 tons, installed within an industrial facility with skylights and structural steel beams

Low Headroom Single Girder Overhead Crane
Compared to the common type of single girder overhead travelling crane, the lifting height can be increased to a greater extent.A bright yellow low headroom single girder overhead crane, with 5 TON prominently displayed, hanging from a red steel structure in a warehouse with white insulated paneling

Underslung Single Girder Overhead Crane
For plants without load-bearing columns and where the roof is load-bearing.A FEM standard yellow overhead crane with DGCRANE branding, situated in a large industrial construction area with metal structures and heavy machinery below.

FEM/DIN Single Girder Overhead Crane
The compact design allows for maximum space utilization, stepless speed regulation, and quiet, maintenance-free operation.An offset single girder overhead crane with a yellow beam and a hoist, set in a large industrial warehouse.

Offset Trolley Single Girder Overhead Crane
The compact design allows for maximum space utilization, stepless speed regulation, and quiet, maintenance-free operation.

Main girder
The single-girder overhead crane utilizes the main girder in the form of I-beam, H-beam, or welded box girder to resist torsion. The main girder is typically made from materials like SS400, Q345B, or Q235. In the case of a box girder, it is internally equipped with partitions and stiffeners, securely welded using specialized equipment.

Block and tackle-Electric winch
The block and tackle play a crucial role in ensuring the lifting, lowering, and moving loads within the factories. This equipment is operated by electric motors, with a lifting capacity ranging from 1 to 500 tons. Therefore, it is widely used in industrial manufacturing factories for loading and unloading of goods.

Boundary beam
The boundary beam is an essential component enabling the main beam to move from the beginning to the end of the factories. The boundary beam consists of two beam bars, fabricated from plate steel, I-beams, or H-beams, which are then mounted on the wheel assembly. Each end carriage is equipped with a moving motor, where the wheel axle supports and motor flanges are processed on CNC machines to ensure the precise alignment of wheels and gears. The boundary beam is connected to the main beam with high-strength bolts at the corresponding torsional moments.

Wheels
The wheels will move along the rail, supported by lifting ball-bearings and lubricated with oil throughout the operation. The wheel body is fabricated from high-strength C45 steel using taper turning methods, then undergoing a surface hardening process to resist abrasion. In addition, the wheel bearings are designed for easy installation and do not require special maintenance.

Electrical Cabinet
The electrical cabinet is responsible for controlling the functions of both the block and tackle and the overhead crane. The crane's electrical control cabinet includes a frequency inverter, contactor, circuit breaker, relay, discharge resistor, phase loss protection and other components. These parts are connected and housed inside a protective casing.

Horizontal and vertical power lines
The power line system supplies power to the block and tackle and the overhead crane. In this system, the horizontal power line for the hoist commonly uses a deep groove electrical system, a C-rail electrical system, and a flat flexible cable electrical system. Meanwhile, the vertical power line for the single-girder overhead crane typically uses a 3P or 4P conductor bar.

Safety equipments (optional)
Safety equipment plays a crucial role in preventing and minimizing risks during the operation of the overhead crane. Safety equipment includes limit switches, overload switches, collision switches, emergency switches, alarms, warning lights, and various other devices.

Weight Capacity
The first thing you must think about is the amount of weight you will be lifting and moving. Regardless of whether you are lifting steel coils, equipment, concrete blocks, aerospace components or something else, you need a single-girder overhead crane that will handle the weight of your loads.The thing to remember about single-girder overhead cranes is that they are designed for light to medium duty. They have limits when it comes to lifting capacity. The majority of single-girder overhead cranes are rated to lift and move loads of between 10 and 15 tons. So, if your loads are heavier than that, you need to be looking at a double-girder overhead crane instead.

Span
You are likely looking to buy a single-girder overhead crane because it is one of the most cost-effective solutions. It uses less material and is lighter and more compact than a double-girder overhead crane. This makes is less expensive to build, ship and install.Just remember that single-girder overhead cranes have a limit to their span. Most models on the market are limited to spans of up to 60′, since most rolled sections are available in lengths of up to 60′. If your span is greater than 60′, you need a stronger crane, such as a double girder or monobox design.

Customization
One of the disadvantages of single-girder overhead cranes is that they are harder to customize with service walkways, platforms, heavy devices under the hook or heavy components. Customizing your crane may be difficult or expensive, or both. So, if you require unique components to be added to your crane, check with the manufacturer to make sure the manufacturer can add these components easily and affordably.

Top Running Versus Under Running
A top-running, single-girder overhead crane runs on top of each runway beam. An under-running, single-girder overhead crane (commonly known as an underhung crane), runs on the underside of each runway beam.The major advantage of one over the other is that top-running, single-girder cranes have a higher weight capacity than under-running single-girder cranes. Under running, single-girder cranes, on the other hand, maximize floorspace when mounted on ceiling trusses or roof structures (eliminating the need for runway support columns).

Assembling Components
Begin by unpacking the crane components and assembling them systematically. Check for any damage during transit and report it to the manufacturer if necessary. Ensure that all the necessary parts, including bolts, nuts, and electrical components, are present.

Install and Fix the Crane Rail
Install the crane rails on site accurately to ensure the level and straightness of the rails. Reserve the expansion joints of the rails and fix them with splints. and fixed with welded pressure plate/bolt pressure plate.

Installing the End Trucks
Start by installing the end trucks on both ends of the bridge beam. Follow the manufacturer's instructions for proper alignment and attachment. Ensure that the wheels are properly lubricated and aligned with the runway rail or runway beam.

Mounting the Beam
Once the end trucks are securely in place, mount the bridge beam on top of them. Use appropriate lifting equipment and follow safe lifting practices to avoid accidents or injuries. Align the beam correctly and secure it tightly to the end trucks using the provided fasteners.

Fixing Electric Hoist
With the bridge beam in position, proceed to attach the hoist to the designated location on the beam. Follow the manufacturer's instructions for proper alignment and connection. Ensure that all electrical connections are made securely and in accordance with safety guidelines.

Connecting the Trolley
Next, connect the trolley to the bridge beam and ensure smooth horizontal movement along the length of the beam. Double-check all connections and fasteners to avoid any potential issues during operation.

Electrical Connections
Once the mechanical components are in place, proceed with the electrical connections. Connect the power supply to the hoist and trolley motors, following the provided wiring diagrams. Ensure that all connections are properly insulated and secured.