L48A1 Mast Section How does the Tower Crane Pulley multiplier work?
tower crane pulley ratio device aims to double the lifting capacity of the lifting mechanism and reduce the lifting speed by one time, so that, the lifting mechanism can meet the construction needs more flexibly. By changing the position of the movable pulley, the ratio of the Hook pulley group can be changed to 2 or 4, and that of the trolley and the Hook pulley is 4. The transformation method is as follows:
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(1)4 times to 2 times, the hook will fall to the ground, erected on the ground, at this time should avoid wire rope and other parts of friction. The wire rope is a little slack, pull out the ratio pin shaft. Start the lifting mechanism in low gear and slowly lift the small pulley splint until it can resist the floor of the amplitude-changing car. Continue to start the lifting mechanism, that is, the formation of a double-rate Hook working group. (2)2 times the rate to 4 times the rate, the hook will fall to the ground, standing on the ground. Continue to lower the wire rope, the small pulley splint will fall to the double pulley splint under the weight. Load the ratio pin shaft, start the lifting mechanism to lift the hook, that is to form a four-ratio Hook working group.
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