L68B3 Mast Section how to maintain the balance of the tower crane is a problem
As you know from basic mechanics, a lever consists of three parts -- a power arm, a resistance arm, and a support point. The length of the power arm times the force applied to it equals the length of the resistance arm times the product of the resistance encountered, which equals the Torque at both ends to keep the lever balanced. Although the structure of the tower crane is very complex, but as a whole, it can be seen as a lever. The counterweight and the force exerted on the crane by the object being lifted are the two forces applied to the lever. And different from the General Lever, the common center of gravity of the crane, the weight and the counterweight of the tower crane will not go beyond the range of the base platform (or supported on the railway track by the wheels) when the counterweight weight of the tower crane is used for different lifting tasks Because the line of gravity must be in the support plane.
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Therefore, when tower cranes or other cranes mounted on platforms are used on construction sites, there is always a mechanism to adjust the distance of the counterweight weight from the support point so that the torque can be balanced so that a heavy object can be successfully lifted Without tipping over. It is worth mentioning that if this condition is not met, for example, the weight lifted is overweight or the counterweight is not heavy enough to allow the weight of the crane to move beyond the platform after the load, the crane will tip over, causing danger. Generally speaking, in the upper part of the tower crane there are two fixed pulley and a moving pulley (pulley block) with an electric winch to pull down the cable, one end to pull the weight, the other end is in accordance with the weight of the weight, adjust the distance of equilibrium, in this way, the two sides together, they put the building materials to the height.
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