Control methods and precautions: 1. Single-girder gantry crane with cab, drivers take the initiative before taking the initiative to deal with hooks, ropes and safety devices and other components required by the inspection card to check and found that anomalies should be ruled out. 2. Ground-operated single-girder gantry crane, each class should be responsible for inspection by the requirements of the spot check card, found that anomalies should be ruled out. 3. The operator must close the main power supply only when it is confirmed that there is no one on the platform or on the track. When the power circuit breaker lock or billboards, should be removed by the original closed before the main power.4. Single-girder gantry crane is a rail-operated small and medium-sized cranes, which apply to the lifting capacity of 2 to 32 tons, the applicable span of 12 to 31.5 meters, the working environment of -20 degrees Celsius to +40 degrees Celsius. This product is a general-purpose crane, used for loading and unloading or grasping materials in open space and warehouse. This product has two types of ground control and indoor control.5. Single-girder gantry crane mainly consists of main beam, beam, trolley operating mechanism, trolley and trolley operating mechanism and CD1 or MD1 electric hoist fixed on the trolley. Hook configuration for mechanical processing, assembly plant, metal structure workshop, metallurgical and foundry workshops