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Загружено: 2024-09-28
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Tower crane hoisting limit sitting full video..
Tower cranes are equipped with limit switches and other safety features to prevent accidents:
Hoist limit switch: Stops the hoist from moving when the hook block approaches the trolley.
Slew limit switch: Stops the jib from rotating more than 1.5 rotations in either direction.
Moment cutout: Stops hoisting if the load being lifted is heavier than the rated capacity.
Max safe working load cutout: Stops the crane from operating if it's overloaded.
Gravity limit switch: Stops the hoist motor when the suspended weight reaches a predetermined point.
Limit switches can also indicate when there are issues, such as a loose rope or two trolleys on the same bridge.
When setting hoist limits, it's important to consider that the number of rope falls between the hook block and the boom affects how quickly the hook block approaches the boom. For example, a hook block will approach the boom four times faster with a single fall than with four falls.
Equipment India
Safety Features in Tower Cranes
The hoist limit switch is a safety device that is provided to allow the setting of the hoist travel within a prescribed travel range. The upper limit of hoist t...
3: Erecting the Tower Sections. ... *
tower crane hosting limit setting new idea...
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