What is the function of the hook of the gantry crane? The important reason for the instability of the lifting object of the gantry crane is that when the crane or trolley operating mechanism starts, because this process suddenly changes from static to moving state, the crane will swing laterally when starting, and the trolley will swing longitudinally. If it swings together, it will swing obliquely. When the hook and the steel wire rope are pulled into a vertical position, the hook or the hanging object will be subjected to the action of two balance forces, and will be rebalanced to keep the speed the same as that of the hanging object, and then move forward together to maintain relative stability.   The main purpose of gantry crane is to disperse or eliminate the component force in the horizontal direction, so as to keep the hook in a relatively stable state and ensure the safety and stability of the crane in the operation process.