Luffing jibs are versatile tower cranes, suitable for any construction site and useful for smaller sites where oversailing needs to be managed or multiple cranes required.
How does a luffing jib crane work?
A luffing crane is able to raise or lower its jib, and that allows it to reduce the slewing radius. A luffing crane is also a good choice for work sites where two or more cranes are working at the same time. This is because the slewing radius is highly reduced in comparison to standard tower crane types.
What is luffing and slewing?
To luff means to move the jib of a crane vertically to lift a load. A luffing jib moves under power (hydraulic or cable) with a load or into a working angle to lift a load. Manually fixed offsets are set at ground level. The boom is lowered and the pins retaining the vertical movement of the offset are removed.
What does luffing mean?
In sailing, luffing refers to when a sailing vessel is steered far enough toward the direction of the wind (“windward”), or the sheet controlling a sail is eased so far past optimal trim, that airflow over the surfaces of the sail is disrupted and the sail begins to “flap” or “luff” (the luff of the sail is usually …
What is a Luffer?
Filters. (architecture) A louver.
What is a luffing cylinder?
Luffing cylinder Luffing cylinder To accurately move a bucket wheel excavator, a reclaimer or stacker, luffing cylinders are used. The luffing cylinder enables the stick-slip free movement and positioning of the arm. The luffing cylinders are used in continuous and sometimes dynamic operations.
What is a jib?
A jib is a sail at the front of a sailboat. … Jib is also a verb, meaning “move to the opposite side of the ship” or “refuse to follow instructions.” The old-fashioned compliment “I like the cut of your jib,” or “I like the way you look,” comes from nautical slang, in which jib meant “face.”
What is slewing angle?
Slewing is the rotation of an object around an axis, usually the z axis. An example is a radar scanning 360 degrees by slewing around the z axis. This is also common terminology in astronomy. … In crane terminology, slewing is the angular movement of a crane boom or crane jib in a horizontal plane.
What is the difference between jib and boom?
“The jib is the fixed steel arm on a crane from which the lifting ropes hang i.e the top T section on a tower crane or on the front of a crawler crane. The jib is fixed in length . A boom is the extendable arm on a mobile crane operated by hydraulics. Mobile cranes sometimes have a jib fixed on the end of the boom”.
What is a slewing unit?
Slewing units are used to rotate and position loads, such as containers, pallets, logs, packaged goods,crane and grabs. Nowadays, a slewing unit forms part of the basic equipment of almost every harbour mobile crane, but it is also used on stationary cargo cranes and deck cranes.
What does it mean to trim your sails?
Sails are controlled by ‘trimming’ them, or adjusting the tension on a line known as a ‘sheet’ that is attached to the sail. Pulling the sheet in, or ‘sheeting in’ rotates the sail towards the centerline of the boat (closer to you). … Trimming sails properly depends on whether or not you’re sailing upwind or downwind.
What is the leech of a sail?
Leech – The aft (back) edge of a fore-and-aft sail is called the leech (also spelled leach). The leech is either side edge of a symmetrical sail—triangular or square.
What is feathering in sailing?
Feathering means sailing by angle of heel instead of maintaining a constant angle to the wind as indicated to the headsail telltales. If steering upwind when a puff hits, let the boat head up slowly to balance the helm and maintain a constant angle of heel.
What is the purpose of a jib on a crane?
It is a crane with a horizontal member, commonly known as the jib or boom. A jib is an operating arm that extends horizontally from the crane. The role of the jib is to support a movable hoist fixed to either a wall or pillar mounted on the floor.
What are the type of cranes?
There are several different types of mobile cranes, including:
- Carry Deck Crane. …
- Crawler Crane. …
- Floating Crane. …
- Rough Terrain Crane. …
- Truck-mounted Crane. …
- Bulk-handling Crane. …
- Hammerhead Crane. …
- Stacker Crane.
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What is a hammerhead crane?
A hammerhead tower crane is one of the most common types of cranes used around the world. … A hammerhead crane also allows you to “rack” the crane. This is moving the trolley in and out along the job with its load suspended but not altering the level of the load.