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If being the structure of upper and lower trolley, the upper trolley is furnished with two main hooks, which re place the external sides of the beam and can shift laterally 0-2m individually or simultaneously; the lower trolley is equipped with the main and auxiliary hooks, which are placed under the beam center; both the upper and the lower trolleys can cross each other to work;
Generally, the main hoisting and trolley running adopts variable frequency speed control, while the cart running adopts variable frequency speed control or series-resistance speed control;
At the side of the rigid leg, the beam has a maintenance crane on the top so as to complete trolley’s maintenance operation;
To prevent storm attach ,there sets up safe and reliable devices against wind, including rail clamp, ground anchor and anchor chain.