(1) Lifting weight indicator (Angle plate, also known as weight limit)
The Angle indicator installed at the root of the arm close to the driving position will change with the elevation Angle of the arm, check the Angle of the arm to the ground, know the elevation Angle of the arm at different positions, according to the performance table and performance curve of the crane, you can know the amplitude value, lifting weight, lifting height and other reference values at a certain elevation Angle.
(2) Over-winding limiter (also known as ultra-high limiter)
A safety device installed on the block at the end of the boom to limit the lifting height of the hook to prevent over-hoisting accidents. It ensures that when the hook is lifted to the limit position, it can automatically send an alarm signal or cut off the power source to stop lifting to prevent over-winding.
(3) Torque limiter
The moment limiter is a safety device that automatically cuts off the lifting or amplitude changing power source when the load moment reaches the rated lifting moment, and sends a prohibited alarm signal, and is a limiter that prevents the instability of the crane caused by overload.
(4) anti-arm rod backtilt device and anti-back rod bracket
The anti-arm lever backtilt device and anti-back lever support are safety devices that no longer lift when the arm lever is lifted to the maximum rated elevation Angle, which prevents the arm lever from leaning backward when the elevation Angle is too large.