What are the safety devices on gantry cranes?
For a crane that changes the inclination of the boom, the hoisting movement must be stopped immediately when the top of the hook device rises above 8OO mm from the lower end of the boom.
When the lifting torque exceeds its rating and reaches 108% of the rated value, the lifting direction and the outward direction
When the lifting torque reaches 90% of its rated value, the lifting torque limiter should be able to emit sound or red light to indicate the alarm.
For trolley cranes, when the top of the hook device rises to 500mm from the bottom of the small frame.
