L68B1 Mast Section Several limiters required for tower cranes
What kinds of limiting devices must tower cranes have?
(1) The lifting weight limiter, also known as the overload limiter, is a safety device that enables the crane to operate without overload. When the lifting weight exceeds the rated lifting weight, it can automatically cut off the power stop of the lifting mechanism or issue an alarm. There are two types of lifting limiters: mechanical and electronic.
(2) The torque limiter is only allowed to lift a certain amount of lifting weight for a variable amplitude crane. If it is overweight, there is a risk of tipping. The torque limiter is a kind of protective device based on this characteristic. At a certain range, if the hanging exceeds its corresponding weight, the circuit is cut off, making the lifting impossible and ensuring the stability of the crane. There are three types of torque limiters: mechanical, electronic and composite.
(3) The height limiter is also called the hook height limiter. It is generally mounted on the head of the lifting arm. When the hook slides to the limit position, it lifts the lever. Press down the limited-position switch, cut off the circuit parking, and when the switch is closed again, the hook can only drop.
(4) Trip Restrictor A safety device that prevents a crane from crashing or limiting the range of travel. It is generally installed on the inside of the active stage car, mainly equipped with a trip switch that can be dialed and pulled. In addition, a fixed limit position baffle is installed at the end of the track(in a limited position). When the tower crane runs to this position, the limit baffle touches the trigger of the stroke switch and cuts off the power source that controls the walk. When re-closing, the tower crane can only run in the opposite direction.
L68B1 Mast Section L68B1 mast section good at in this field
