Portable overhead crane is kind of small crane. It mainly refers to single girder crane. With compact structure, portable crane takes little effort to check, maintain and repair; with durable material, this crane has long service term; with light weight, the crane can move very fast and finish work quickly.
Lifting Capacity: 5~100t
Span Length: 10.5~31.5m
Lifting Height: 6~18m
Working Class: A3, A4
Ambient Temperature: -20~40℃
Portable cranes include various types, such as monorail overhead crane, garage overhead crane, explosion proof crane, metallurgy crane. These cranes can adapt to different working requirements and conditions well. For example, anti-explosion bridge crane is designed for explosive. High temperature, flammable environment. And this special crane is equipped with special electric hoist, explosion proof hoist.
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Lifting Capacity: 1~10t
Span Length: 3~22.5m
Lifting Height: 6~12m
Working Class: A3
Ambient Temperature: -20~40℃
Convenience of portable overhead crane
For light and frequent lifting work, heavy duty overhead crane is not necessary, portable overhead crane is enough. It can deal with lifting and transporting work well.
With light dead weight, this kind of lifting crane can be transported from one place to another place easily and quickly. And light weight also makes installation much easier.
Portable crane has wide application in many fields. It has various types to adapt to the working condition. For example, under-traveling crane is perfect choice for factory with restricted height. It can save much area.
Compact structure makes daily check work easier and faster. The worker doesn’t need to take much time or effort to do maintenance and repair.
And its operation is also easy. There are standard operation rules for operator. The operator gets professional training and uses the crane based on principles. This is the best way to ensure the safety of crane and operator.
Portable crane has small size. Most of factories and warehouse can adopt such crane. This makes it wide application and large market.
Such flexible traveling crane is affordable. Compared with heavy duty large crane, light duty small crane is much cheaper. The factory price also makes it popular in industrial field.
Compact structure of small bridge crane
Hook has a connecting function. The lifted load is supported using a hook. It connects to the lifting 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.
The trolley supports the hoist, and moves horizontally along the crane bridge, to position the hoist, prior to picking up or lowering a load.
Trolleys can be configured in an under running or top running design.
Under running system is that trolley wheel run on the bottom flange of the crane beam.
Top running system is that trolley wheels run on rails fitted to the top of the crane beam. This is most frequently seen in higher-capacity double girder designs.
Bridge is a load-bearing beam. It runs the width of building. This is the primary structural component. It 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 is typically part of the building structure, as beams, and there are two per overhead bridge crane system. The bridge crane travels on runway to move the crane up and down the bays.
Rail is supported by the runway on which the crane travels. Top running cranes typically run on 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 are 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 rails. Each end truck can have a configuration of 2, 4 or 8 wheels based on crane’s capacity.
Bumpers are designed to absorb the crane’s energy and reduces impact. Bumpers can bring the crane to rest in a controlled manner and minimize forces when the crane or trolley reaches the end of its travel. Bumpers can be attached to the bridge, trolley or runway stop.
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, can can control variable frequency drives to control hoist speed for precise load positioning.
Electrification-insulated conductor bars or festoon systems bring power to the crane from the building.