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Bender is the tunnel support steel arches manufacture of new equipment. It consists of a base, a mechanical transmission, roll forming system, hydraulic system, electrical control system and auxiliary system comprised of six parts. Work Shi, will by needed cold bent processing of steel by auxiliary system of door type Bay pushed put in two active wheel Zhijian, started hydraulic system makes hydraulic cylinder promoted yan tail slot and cold bent wheel cold pressure steel, stay reached design by needed radian Shi closed hydraulic system, started mechanical drive system, makes active wheel turned and relies on friction led steel smooth slow forward, thus achieved continuous cold bent job. Cold-formed at the end of closed mechanical drive system, also started the hydraulic systems, hydraulic cylinders back. The cold-formed steel is placed on the door bracket on the secondary system. Such cold bending operation to ensure the strength of the material, improves the quality of the supporting steel arch, which greatly improves the ergonomics, operation is simple and clear. Bending machine compared with the press, has a good performance.