Hello, I'm glad to answer your question. Gantry crane is a kind of crane. To open the gantry crane, you must go through special safety technical training, pass the examination, and obtain the People's Republic of China (PRC) Special Operation Certificate before you can work at your post. At the same time, because the special operation certificate is valid for six years, it is reviewed every three years, and it needs to be re-examined and renewed after six years. Those who fail to participate in the evaluation on schedule will be fined, and prizes that have not been evaluated for a certain period of time may be invalid.