The crane is rated by the weight of the lift and the weight of the rise, or only the rise of the Lord
Rated lifting weight refers to crane allowed to lift heavy objects or materials, together with the spreader (or with) can be divided into the sum of quality (for floating crane, including fixed on the crane hook). Known crane rated lifting weight, by definition, is that kind of situation, depends on whether the crane design allows the main lifting and work at the same time, if allowed, and can lift the two (not the whole machine) and rated lifting weight, is rated lifting weight of the machine is the two together, if not allowed, the crane is the main lifting rated lifting weight. Of course, it's usually the latter. Downstairs said is right, but sometimes, double car bridge crane, for example, if a car rated lifting weight is less than another, you can think is one of the vice hook, such as a 20 t, the other is a 10 t, its representation is 20 + 10, the somebody else, the inspection, as 30 t to consider. I'm thinking about that.
The main hook is the rated weight of the main hook, the vice hook is the nominal weight of the hook, non-interference,
The rating of the crane is never added by the master! This is wrong, and there is no such thing. It's not just about the main hook, it's about the main pair. (in general speaking, the main hook, especially the ground crane, but this is restricted to the spoken language! The standard way of saying this is wrong.) If a crane is the main hook structure, the standard is usually the main hook/hook T. For example, the main hook, 25T, and the hook 5T, then the weight of the crane is 25/5t. And so on.
The main hook is the rated weight of the main hook, which is the nominal weight of the hook and does not interfere with each other. The lifting weight of the main pair is 300 tons, 50 tons respectively, the crane is usually equipped with two hooks, because the main lifting speed is slower than the lifting and heavy lifting, and it has the vice lift. Scope: crane boom and horizontal plane Angle, generally between 0 ° and 78 °. Lift weight: the weight that crane can lift, different amplitude, can lift the biggest weight is different. Multiplier: the crane is pulled by a pulley using a pulley, which is not efficient, so the multiplier is 1. With a pulley, half of the force, the multiplier is 2, and the multiplier is 4.
