The main beam processing of double beam crane refers to the process of processing and manufacturing the main beam of the crane. The processing requires the following steps: 1. Material preparation 2. Design and drawing: According to the requirements and specifications of the crane, the design and drawing of the main beam. The design includes the shape, size and connection mode of the main beam, and the drawing transforms the design scheme into a specific drawing. 3. Material cutting 4. Processing and molding: the cut material is processed and formed. Machining includes drilling, milling, turning and other processes to achieve the shape and size required by the design. 5. Welding: Welding the finished parts. Welding is the process of connecting multiple parts together to form an overall structure. When welding, it is necessary to control the welding temperature, welding speed and welding quality to ensure the strength and stability of the welded joint. 6. Surface treatment: surface treatment of the welded main beam. The common surface treatment methods are spray painting, galvanized, sandblasting, etc., to improve the corrosion resistance and beauty of the main beam. 7. Inspection and debugging Through the above steps, the processing and manufacturing of the main beam of the double beam cranes （overhead crane, gantry crane, port crane etc. ） can be completed, so as to ensure the safety and reliability of the crane.