Single Girder Overhead Crane
What is Single Girder Overhead Crane?
Single girder overhead bridge cranes. On a single girder crane, the bridge consists of one girder beam supported on each side by an end truck. The trolley and hoist are most commonly underhung—meaning they run on the bottom flange of the bridge. The bridge itself can either be top running or under running in design.
Advantages of Single Girder Overhead Crane
Simple structure:Single-girder bridge cranes have a simple structure, consisting of one main beam and two support rails. They are simple and convenient to operate. Different from double-girder bridge cranes, they have fewer counterweights and components, which reduces construction and maintenance costs.
Large span:Single-girder bridge cranes are usually suitable for places with large spans and wide working ranges. They can flexibly adapt to the needs of various occasions, and the lifting height and lifting capacity can also meet most needs.
Light weight:Compared with double-girder bridge cranes, single-girder bridge cranes have a lighter weight and can use space more effectively with the same span. Moreover, its plate beams are made of high-strength steel, giving it better durability and stability.
Easy to install and maintain:Due to the simple structure of the single-girder bridge crane, the installation operation does not require too much professional knowledge and skills. It has the characteristics of detachable and modular design, which brings great convenience to maintenance and inspection. Moreover, single-girder bridge cranes do not require a traction mechanism, saving space and energy consumption.
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How to Choose Single Girder Overhead Crane
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.
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.
A top-running, single-girder overhead crane runs on top of each runway beam. An under-running, single-girder overhead 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.
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.
Single Girder Vs Double Girder Crane
Structural differences
Within the entire structure of a single-girder eot crane, there is only one girder. A double girder, on the other hand, has two girders. What exactly are girders? In layman's terms, girders are the metal beams that connect the side traveling mechanisms.
An electrical hoist travels on the lower flange of the sole and main girders in a single girder. There is no hoist on the double girder crane. Instead, it uses a crab-shaped mechanism that travels across both girders.
A single girder for part maintenance, eot cranes, do not require separate cross-travelling rails and platforms. The others, on the other hand, are required to meet these criteria.
In single-girder cranes, you won't be able to find continuous platforms. There are three platforms in total, two small ones around the motor and one for panel maintenance. Along with the crab-shaped structure, a double girder machine has a continuous platform and a different platform.
Factory technicians and repairers do not have set schedules. They are required to work at night on occasion. In these situations, double girder machines are preferable because they include under-bridge lights, which reduce the risk of accidents. Eot cranes with a single girder do not have this feature.
These cranes' engines and gearboxes also vary significantly. Flange-mounted engines and modular gearboxes are standard on single-girder cranes. Double girder cranes, on the other hand, often include foot-mounted engines and horizontal gearboxes.
Functional differences
To monitor a single girder crane, you can use the pendent and radio remote system. However, you won't be able to do so because you don't have access to the operating cabin. In the case of a double girder eot crane, all three options are available.
A single girder crane can only give you a dc disc brake to stop the function. However, in a double girder, you can get the dcdisk brake and eht brake combination with no brake-use restriction.
A single girder crane’s operators can control the hoist's up-and-down movement using a snap action limit switch. A wire rope guide activates the switch’s function. A geared rotary limit switch on a double girder crane allows you to control the crane. That system is capable of determining the hook's movement and limiting the up-and-down movement.
The functional area's maximum span and lifting capacity are also different. A single girder crane's maximum functional area is around 30 meters. It can lift a load of up to ten tonnes at a time. A double girder crane has a much larger functional area and lifting capacity than a single girder crane. You can lift and move weights of up to 500 tonnes with a double girder crane.
Single girder cranes are typically used for lighter loads and can handle common materials. On the other hand, a double girder crane can be used for any application and can take any type of material.
The wheel load of a single girder crane is much lower due to its lighter weight. The small gantry girder accommodates the crane’s size. The gantry girder size is undoubtedly larger due to the heavier weight of a double girder crane.
The cost of a double girder crane is slightly higher than that of a single girder crane. The price rises as the weight-bearing capacity and size increase. On the other hand, double-girder cranes are more manageable and less expensive to maintain than single-girder cranes.
Types of Single Girder Overhead Crane
Bridge cranes
As we’ve mentioned, bridge cranes are a very common type of overhead crane. These cranes are installed inside manufacturing facilities, warehouses, and other buildings as permanent structures. A system of runways is installed throughout the building to provide material handling coverage to various locations. Then, bridges and end trucks are connected to the runways. Finally, hoists and trolleys are installed, and the electrical system, if present, is wired up.
Monorail cranes
Much like a monorail train system, a monorail crane carries a load throughout a facility on a single suspended track. The monorail track is attached to the ceiling or a freestanding support structure. Depending on the length of the monorail crane setup, it may have multiple hoist and trolley systems, allowing operators to move multiple loads along the track.
Gantry cranes
An overhead gantry crane is essentially a fixed bridge attached to two columns with wheels. Rather than traveling along runways, a gantry crane operates directly on the ground. Some extreme-capacity gantries, such as those used for container handling at ports, may have a two-beam bridge on top of columns that travel on a track. As with overhead bridge cranes, a hoist and trolley system lifts, lowers, and moves the load.
Jib cranes
A jib crane resembles an upside-down “l.” the most essential jib crane part is the individual beam, known as the boom, that supports the hoist and trolley to lift and move loads. The boom also supports any electrical components, air hoses, or other attachments. The boom can rotate 180 degrees or 360 degrees, allowing the crane operator to move loads along a semicircular or full circular path as needed.
Components of Single Girder Overhead Crane
Hook
The lifted load is supported using a hook which connects to the hoist.
Hoist
The hoist is what makes the lift and holds, raises, or lowers the load using wire rope or chain. Hoists can be powered manually (by hand), with electricity, or with compressed air (pneumatic).
Trolley
The trolley supports the hoist and moves horizontally along the crane bridge, to position the hoist and hook, prior to picking up or lowering a load.
Top running
Trolley wheels run on rails fitted to the top of the crane beam. Most frequently seen in higher-capacity double girder designs.
Bridge
A load-bearing beam that runs the width of the building. This is the primary structural component that connects the runways and moves the hoist forward and backward using a trolley.
A bridge can be comprised of one or two beams
More often referred to as a single girder or double girder design. Girders can be made of rolled steel or can be fabricated by welding the beams into a steel box design.
Runway
What the bridge crane travels on to move the crane up and down the bays. These are typically part of the building structure, as beams, and there are two per overhead bridge crane system.
Runway rail or tracks
Rail supported by the runway on which the crane travels. Top-running cranes typically run on asce/railroad rails. Gantry cranes can also utilize a rail or track system installed in the floor to move the bridge back and forth.
End trucks
Located on either side of the bridge, the end trucks move the bridge up and down the runway utilizing a series of wheels that ride on the rail. Each end truck can have a configuration of 2, 4, or 8 wheels based on the crane’s capacity.
Bumpers
Bumpers are designed to absorb the crane’s energy and reduce impact—bringing the crane to rest in a controlled manner and minimizing forces when the crane or trolley reaches the end of its travel. Bumpers can be attached to the bridge, trolley, or runway stop.
Controls
Controls are typically mounted in a panel on the crane or hoist and the pendant or remote radio console allows the operator to run the crane. The controls operate the drive and hoist motors, and can control variable frequency drives (vfds) to control hoist speed for precise load positioning.
Electrification
Insulated conductor bars or festoon systems (flat cables) bring power to the crane from the building.
Precautions for Using Single Beam Overhead Crane
Before operation, carefully check whether the electrical parts and protective insurance of the industrial single beam overhead crane price are in good condition. Such as controllers, brakes, limiters, electric bells, and emergency switches.
When approaching the winch limiter or the terminal station, the speed should be slow. It is not allowed to reverse instead of braking, limit switches instead of parking switches, and emergency switches instead of ordinary switches.
Walk or get up and down on designated safe passages, specialized platforms or escalators. Do not walk except for major repairs to the crane.
When two devices are simultaneously lifting an object, it is necessary to obey the command to avoid damage to the heavy duty single beam overhead crane company and the lifted object due to inconsistent steps.
During operation, a certain interval should be maintained between devices.
The maintenance of mobile single beam overhead crane supplier should be placed in a safe position, the power should be cut off, and a "check gate" warning sign should be hung. Fences should be set up in the air and "stop traffic" signs should be hung.
Emergency measures need to be taken to land in an unmanned area when a sudden malfunction causes the lifting component to slip during operation.
During operation, attention should be paid to whether there are obstacles on the track. When lifting high objects that obstruct visibility, there should be someone on both sides to monitor and command.
FAQ
Q: What is a single girder overhead crane?
Q: What is the difference between single girder and double girder cranes?
Q: What is a girder on a crane?
Q: What is the capacity of a single girder crane?
Q: What is a single girder crane used for?
Q: What is the difference between a monorail and a single girder crane?
Q: What is single girder under running bridge crane?
Q: What is the difference between a gantry crane and an overhead crane?
Q: What is the difference between monorail crane and overhead crane?
Q: What are the advantages of overhead cranes?
Q: What is the maximum capacity of single girder crane?
Q: What is single girder gantry crane?
Q: What is the difference between a monorail and a single girder crane?
Q: Why are trusses used in cranes?
Q: What is the gap between crane rails?
Q: What is the main girder of a crane?
Q: What are the components of overhead crane?
Q: What are the components of a gantry girder?
Q: How does a overhead crane work?
Q: What is the difference between an overhead crane and an overhead hoist?