The contents of the textbook include: an overview of the basic knowledge of crown block; Safety technology of main components of crown block; Safety protection and placement of crown block; Operation rules and maintenance methods of crown block safety technology; Operation of general bridge crane; Operation of metallurgical crane; Electrical equipment of crown block; Circuit and principle of crown block; Common faults of crown block and their elimination methods: Chapter * * * 10 on the technical level requirements of crane operators and practical operation assessment examples. The content of equipment maintenance and safe use has been added to the revised textbook, some old standards and terms have been replaced, and an examination database has been added.

The questions in the question bank include true or false questions, multiple-choice questions and short-answer questions. The answer is concise, accurate and focused. The test paper coverage in the evaluation sample is moderate, and the selection of test questions is standardized, which can be used for students' self-test and testing.

After the revision, this book is more concise and practical, which is convenient for workers to study and test themselves. It can be used as a teaching book for crane professionals in technical schools, a training material for junior and intermediate crane workers, and also as a reference for relevant professional and technical personnel.