The Safety Devices for Crawler Crane
(1) From the weight indicator (angle plate, also known as weight limiter)
Installed in the arm near the root of the driving position of the angle indication, which changes with the boom angle, reflecting the angle between the boom and the ground, to know the elevation angle of the boom position, according to the crane performance tables and performance curves We can see the amplitude value at an elevation angle, lifting weight, lifting height and other reference values.
(2) Over winch limiter (also known as high limiter)
Installed on the end of the boom group pulley block limit lifting height, to prevent the accident occurred winch safety device. It ensures that the lifting hook to the limit position, it can automatically send an alarm signal or cut off the power source to stop lifting to prevent over-reeling.
(3) Torque limiter
Torque limiter is a safety device that automatically cut off the power source of lifting or luffing and sends a forbidden alarm signal when the load moment reaches the rated lifting moment, and is a limiter to prevent the crane from being buckled due to overloading.
(4) Anti-arm back device and anti-back bar bracket
Anti-boom lever backstop and anti-back lever bracket, when the boom is raised to the maximum rated elevation, no longer enhance the safety device, which prevents the boom angle is too large when caused by backward.