(5) must comply with the command signal, the signal is unknown or not to leave the danger zone commanders (commanding officers standing on hanging objects or with ground equipment in a confined area between hanging objects) are not allowed to drive a car before; (6) the driver only obey the command to specify beforehand drive signal emitted. Any person issued a stop signal, must immediately stop. (7) Although the command staff issued a command signal, but he did not look when hanging objects, you should not drive; (8) the crane controller should gradually shift plus (minus) speed, prohibited direct control handle from the forward position to Reverse position as a parking purposes (only in case of accident prevention are allowed). (9) Crane or trolley should slowly close to the end, to avoid collision fences. (10) only in the understanding of the surrounding conditions are allowed to use a crane to load slowly pushing another crane. Four truss structure a combination of four pieces of plane truss structure into a closed space, generally in a horizontal truss paved walkway surface plate, light weight, stiffness, but compared with other structures, size large, complex manufacturing, fatigue lower intensity, Jinzhou double girder crane, has been less production. Partial fasting truss structure similar rail box girder, a closed structure consists of four steel plates composed of, in addition to the primary web is solid web-shaped beam, but the remaining three steel plates in accordance with the design requirements into many windows form a non-inclined pole fasting trusses, the upper and lower surfaces of the horizontal truss plate lined with walkways, crane operation mechanism and electrical equipment installed in the bridge inside, lighter weight, the overall stiffness, which is a type widely used in China. Common bridge crane mainly electric drive, usually operated in the cab, there are remote control. From the weight of up to 500 tons, span up to 60 meters. Easy-beam bridge crane, also known as crane beam, its structure and composition is similar to ordinary bridge crane, from the weight, span and work rate are small. Bridge the main beam is a simple cross-section beam by a beam or other beam and plate steel composition, hand pull hoist or trolley hoist coupled simple as lifting the car, Henan double girder crane, trolley usually in the wing-beams edge running. Can bridge the orbiting overhead, but also suspended in underpasses along the orbit, which is called the crane girder suspension cranes. Metallurgy bridge crane in the steel production process can participate in a particular process operation, its basic structure and general overhead crane similar, but lifting a small car is also equipped with special work mechanism or device. Working features of this crane is the use of frequent, harsh conditions, high operating levels. Jinzhou double girder cranes, generous heavy double girder crane power provided by the generous Heavy Machinery Co., Ltd., Henan Province. Jinzhou double girder cranes, generous heavy, double beam crane power is generous Heavy Machinery Co., Ltd., Henan Province (www.hnqizhongshebei.com) (www.hnqizhongshebei.com) this year introduced a new upgrade, the above picture is for reference only, please dial this page or on the telephone picture to obtain the latest information, contact: Liu.