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 is the whip line on a crane?
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 a headache ball on a crane?
A headache ball is a weighted sphere attached to a lifting hook; the assembly is fastened to a wire rope for crane lifting operations (Figure 1). … Figure 1. Headache balls, also known as overhaul hook balls, are used to keep tension on load lines — usually, single-part or “whip” lines.
Why do cranes have two hooks?
It is quicker and easier to use. The larger hook is then used for heavy lifting. Both hooks can be used in tandem for complicated lifts, including flipping something upside down etc.
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.
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 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.
What does dog everything mean in crane signals?
Dog Everything: Clasp hands in front of the body. Means PAUSE. This signal can be used on potentially risky occasions such as when it has started raining, when the load doesn’t fit the space for which it was planned, or when a bystander gets too close to the action.
What is an overhaul ball?
Heavy steel ball used to provide ballast on the hook end of a crane hoist rope. Overhaul balls supply the downhaul weight necessary to counter bearing friction and winch-to-boom-tip line weight. It can also be used in lieu of a winch.
What is a crane block?
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 difference between lifting and rigging?
A team of riggers design and install the lifting or rolling equipment needed to raise, roll, slide or lift objects such as with a crane or block and tackle. Rigging is the equipment such as wire rope, turnbuckles, clevis, jacks used with cranes and other lifting equipment in material handling and structure relocation.
What is the purpose of a fly jib on a crane?
A fly jib is a lifting device which assists a crane operator in picking and placing a load at a target area. A fly jib is particularly useful in that it allows the crane operator to place the load, such as construction materials, inside a multistory building.
What is the difference between hoisting and rigging?
is that rig is to fit out with a harness or other equipment while hoist is to raise; to lift; to elevate; especially, to raise or lift to a desired elevation, by means of tackle or pulley, as a sail, a flag, a heavy package or weight.
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.
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.
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.