Generally speaking, the most commonly used method to measure the height of traveling block is to install an angle counter on the winch drum shaft, and there has been a method to calculate the height by pulling a rope alone before. There seems to be an ultrasonic positioning method. But generally speaking, installing a counter on the drum is one of the most direct and reliable methods.

As we all know, under the condition of fixed parameters such as diameter and number of layers, the length of the rope paid out or wound on the winch drum is certain every turn, or every turn for a certain angle, so we know how many turns there are, and then we know how many ropes are paid out or recovered. Through calculation, it is easy to get the actual value of the hook height of the traveling block.