Keep overhead crane moving smoothly and avoid the abrupt and jerky movements during lifting. When lifting materials, avoiding everyone close to the hoist hook, sounds a bell and then start to hoist slowly. Strictly follow the signals to operate the crane except the emergency stopping situation.
How do overhead cranes work?
What is an Overhead Crane? Overhead cranes cover a rectangular area, moving a load side to side and backward and forward. The lifting device, called a hoist is mounted on a trolley for horizontal movement across a bridge beam connected to one or more horizontal girders which are supported at either end by end trucks.
What must be done before operating a crane?
Make sure the crane is suitable to lift and travel the load. … Visually inspect the crane before use. Make sure all loose materials, parts, blocking and packing have been removed from the load before lifting. Remove any slack from the sling and hoisting ropes before lifting the load.
How do you control a crane swing?
You should familiarize yourself with how to stop it. In some cases, you can do it by gradually pulling your throttle in the opposite direction of the way your crane is swinging. In others, moving your boom up and down repeatedly will steady the crane. The key is to counteract the motion of your crane to get it to stop.
What are the major advantages of overhead Travelling Crane?
What are the Benefits of Overhead Cranes?
- Increased Safety. Forklifts carry the risk of imprecise stacking, dropping goods as well as accidents (due to crashing). …
- Improved Load Control. …
- Avoid Floor Obstructions. …
- Improved Ergonomics. …
- Easy Lifting of Loads. …
29 июл. 2016 г.
What are the three functions of a crane?
The main purpose of a crane is to lift extremely heavy amounts of weight. A typical crane is equipped with a hoist rope, wire ropes or chains and sheaves.
Modern day cranes are used for:
- Construction Materials.
- Railroad Tracks.
- Shipping Materials/Equipment.
- Scrap Metal.
- Mobile Homes.
5 нояб. 2015 г.
Who can operate a crane?
Operators of most cranes above 2,000 lb. capacity when used in construction will need to be either certified by an accredited crane operator testing organization, such as the National Commission for the Certification of Crane Operators (NCCCO), or qualified through an audited employer program [§ 1926.1427(a)].
What are the most common types of crane accidents?
OSHA’s analysis of crane accidents identified the major causes of crane accidents as:
- boom or crane contact with energized power lines (nearly 45% of the cases)
- under the hook lifting device.
- overturned cranes.
- dropped loads.
- boom collapse.
- crushing by the counter weight.
- outrigger use, falls and rigging failures.
What types of power does a Category 1 or 4 Crane generally use and what is its source?
Category 1 and 4 Crane Power Types Category 1 and 4 cranes generally use electric or hydraulic power that is supplied by a diesel engine. A collector ring system conveys electrical current from the revolving portion of the crane to the lower crane structure.
How much can a gantry crane lift?
They have spans of 140 metres (460 ft) and can lift loads of up to 840 tonnes (830 long tons; 930 short tons) to a height of 70 metres (230 ft).
What is an overhead gantry crane?
A gantry crane is a type of overhead crane with a single or double girder configuration supported by freestanding legs that move on wheels or along a track or rail system. … These are typically used for an outdoor application or below an existing overhead bridge crane system.
What is meant by EOT crane?
Electric overhead traveling crane or EOT crane is one of the most common types of overhead crane, also called bridge cranes, which consist of parallel runways with a traveling bridge spanning the gap.
How is crane deflection calculated?
To measure your deflection, use the deflection limit defined for that type of crane and divide that number by the length (or span) of your specific system. If your bridge length is 34 feet, you will divide the deflection limit defined by your manufacturer (L/450 for workstation bridge cranes).
How do you reduce boom deflection?
To minimize any crane boom deflection after a heavy load is landed, the crane operator should lower the boom to release the weight of the load.