The European Double Girder Bridge Crane Trolley is a key component in the crane system and is usually used for heavy lifting operations. It is carried by the main beam and secondary beam of the double girder crane, combined with the electric trolley and the crane's electric hoist to achieve lifting, translation and moving of goods.

CATET Co.,Ltd is a technology-based manufacturing enterprise integrating equipment research and development and intelligent manufacturing, affiliated to Dongqi Group. The group's brands include: Dongqi Crane, BTARO Crane, SZW, CATET. The company currently has more than 560 employees, including more than 80 management and technical personnel. It has more than 500 sets of various production and testing equipment, including 30 CNC machining centers, 1 Italian COORD3 three-coordinate measurement center, and 10 laser and cutting centers. The annual comprehensive production capacity is more than 10,000 sets. The products are mainly exported to 96 countries and regions including Southeast Asia, Europe, and the Middle East. The company has GJB9001C, IS09001, IS045001, ISO14001, ISO50001, ISO10012, GBT29490, GBIT23001, GBIT23006 and other standard certifications, and has obtained multiple certifications such as EU CE certification. The company's main products include: bridge cranes, gantry cranes, electric hoists, chain hoists, hooks, wheel sets, motor reducers, cabs and other crane accessories, rail transport vehicles, trackless transport vehicles, etc. The company cooperates with well-known domestic and foreign companies such as Schneider, SEW, ABM, ABB, Danfoss, SKF, etc. All parts and structural parts are produced in strict accordance with technical standards. The products are widely used in steel and electricity, petrochemicals, machinery manufacturing, military industry, warehousing and logistics, papermaking, steel manufacturing, automobile manufacturing and other fields.