JIB CRANE – A crane design whereby the bridge girder (commonly called the boom) is fixed at one end, allowing the opposite end to cantilever. The fixed end generally is hinged to allow rotation. LIFT – Maximum safe vertical distance through which the hook, magnet, or bucket can move.
What are the parts of a crane called?
The Various Functions of Mobile Crane Parts
- The Driving Components. In any mobile crane, one of the common components will be the driving system used to make it mobile. …
- The Operator’s Cabin. The operator’s cabin houses all of the crane’s controls. …
- The Boom. …
- Hoist and Hook. …
- Hydraulic Pump. …
- Outriggers and Counterweights.
6 февр. 2020 г.
What is a crane whip line?
Auxiliary (whip line or fast line): the secondary rope system capable of lifting a lower capacity than the main block. Boom: connected to the upper structure and supports the hoist tackle. Boom hoist: raises and lowers the boom.
What is the long part of a crane called?
The long horizontal jib is the part of the crane that carries the load. The counter-jib carries a counterweight, usually of concrete blocks, while the jib suspends the load to and from the center of the crane.
What is a crane boom stop?
Seatrax offshore cranes can come equipped with hydraulic boom stops that also function as a high angle limit system. Controlling the motion of the hydraulic boom stop allows the crane to work at higher than normal boom angles, using more deck area around the crane. …
What is a crane boom called?
Boom. The most recognizable part of a crane, the boom is the arm of the crane that holds the load and allows the crane to move the load closer to or away from the crane by lowering and raising the Boom.
How much does a crane cost?
Mobile Crane ($125,000 – $525,000+) – A common type of crane that is transportable, but may have limited range compared to the telescopic crane.
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 is a shiv on a crane?
A sheave (/ʃiːv/) or pulley wheel is a grooved wheel often used for holding a belt, wire rope, or rope and incorporated into a pulley. The sheave spins on an axle or bearing inside the frame of the pulley. … Sheaves can be used to redirect a cable or rope, lift loads, and transmit power.
How is crane load capacity calculated?
Measure geometric components
- The standard calculation for maximum crane capacity is (r)(hC)/100.
- R = Radius between the ground and load.
- hC = Lifting height multiplied by the capacity.
30 мар. 2020 г.
What stops the crane from falling over when it lifts something?
Why Don’t Tower Cranes Fall Over? This is mostly down to the concrete base, which is massive and needs to be poured weeks before the crane arrives. The triangulated cross-member structure of the mast gives it more stability and prevents bending. Plus, it’s anchored and bolted to the ground.
Is an excavator considered a crane?
Excluded from the new rule, however, are cranes that have been “converted or adapted for a non-hoisting/lifting use,” including power shovels, excavators or concrete pumps. … Service trucks equipped with a crane also are exempt, as long as the crane is used only to maintain or repair equipment.
Why does the crane need to rotate?
Why does the crane need to rotate? … It has an input force or effort from the diagonal cables right at the top of the crane pulling the jib up, and a load pulling the jib down.
What is the most dangerous factor among crane accidents?
The most common cause of fatalities is workers or bystanders who are struck by an object that falls from the cranes. Other causes include being run over by a crane, falling from a crane, and electrocution.
At what wind speed Do cranes shut down?
Generally speaking, cranes should proceed with extreme caution when winds are between 0-20 mph. Capacity deductions vary based on crane model and boom length between 20-39 mph. All crane operations must be shut down and the boom retracted and lowered to horizontal when wind speeds exceed 40 mph.
What affects the amount of weight a crane can lift?
For example, if the boom of the crane is extended to 250 feet and the radius (the distance from the center of the load to the center of the crane) is 180 feet, the max load weight drops considerably. The shorter the lift, the more weight can be handled. Transportation of the cranes also needs to be considered.