A Load Block is the assembly of hook, swivel, bearing, sheaves, pins and frame and is suspended by hoisting ropes or load chains. It is used to lift and move objects up to a specific lifting capacity.
What is a crane hook block?
“A hook block is an assembly to which the hook of a hoist or crane is attached; it typically consists of a steel enclosure housing a number of sheaves or pulleys that carry the ropes or chains that facilitate the lifting of a load.
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 is a whip line on a crane used for?
Basically, without this piece of equipment, you would not be able to attach a load to the crane. Even though the headache ball is the simplest form of a crane hook and in most situations is used to keep the wire rope tight. The “whip line” as it is referred to in the crane community, is attached to the headache ball.
What are the parts of a crane called?
- Mast: the main supporting tower of the crane. …
- Slewing unit: the slewing unit sits at the top of the mast. …
- Operating cabin: on most tower cranes the operating cabin sits just above the slewing unit. …
- Jib: the jib, or operating arm, extends horizontally from the crane.
What is anti two block in a crane?
An anti-two-blocking system is a technologically advanced electrical device with a built-in sensor that helps the crane operator prevent two-blocking incidents. Two of the most popular variations of this safety device are wireless ATB systems and hardwired ATB systems.
How much can a 40 ton crane lift?
It’s easy to tell how much a particular hydraulic truck crane can lift just by the name of it: A 40-ton crane can lift 40 short tons (80,000 pounds or 36,287 kilograms).
How much can a 50 ton crane lift?
Produced by Terex, the American HC 50 is a hydraulic crawler crane that’s nimble, yet, very capable of performing tough tasks. It has a 50 ton (45.4 t) max lift capacity, 160 ft. (48.8m) max lift crane boom length, and a 130+40 ft. (39.6+12.2 m) max lift crane boom & Jib length.
How far can a 30 ton crane reach?
Hydraulic Truck Cranes
Hydraulic trucks range from 30 to 600 ton capacity and feature a hydraulic boom that can reach lengths up to 200 feet.
What is the most common cause of death to crane operators?
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.
What part of the crane is used to lift and lower the load?
Hoist – A mechanical unit that is used for lifting and lowering a load via a hook or lifting attachment.
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)].
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.
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.
What is the end of a crane called?
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.