Today's world can be said to be a "sea century", any country in the world if you want to better development, it must actively develop the international trade of the ocean, every day the busy container loading and transportation in the ports of various countries is the best proof. But the port with a large gantry crane is a highly complex and sophisticated electrified machinery and equipment, the world can manufacture large gantry crane enterprises are few and far between, this technology is only in the hands of individual countries, is basically a monopoly technology, and can design and manufacture reliable quality and affordable products of enterprises, it is rare. But there is a company in China, almost monopolizing 80% of the international market of large gantry cranes, almost to the extent that "where there is a container port in the world, there should be Zhenhua's port machine". Good, the company that makes Chinese people proud, is Zhenhua Heavy Industry (ZPMC).