Tower crane body standard section connection bolt screw upward or downward, why?.
A few days ago, a special training course of mechanical equipment, a safety supervision station old experts say the screw from the upward wear, stress is the same, but if the nut screw will fall off, in order to find problems. If you can't get it off the top and bottom nut, you won't find it
Usually it is worn from top to bottom, so that the nut is loose and the bolt will not fall directly
Up or down, there is no change in the firm torque of the connecting bolt. Simply choose to go up or down for convenience. Generally no special requirements, it is recommended that the thread upward, so that it is not easy to rust.
