The grab double girder bridge overhead crane is mainly composed of a box bridge, a grab trolley, a cart operating mechanism, a driver’s cab and an electrical control system. The fetching device is a grab bucket.
A lifting mechanism and an opening and closing mechanism are arranged on the grab trolley, and the grab is respectively wound on the lifting and opening and closing reels with four steel wire ropes. The opening and closing mechanism drives the grab bucket to close and grabs the material. When the bucket mouth is closed, the lifting mechanism is activated immediately, so that the four steel wire ropes are evenly loaded for lifting work. When unloading, only the opening and closing mechanism is activated, and the hopper opens immediately, tilting the material.
Except for the different lifting mechanism, the rest of the structure of the crane is basically the same as that of the hook bridge crane.
1) Overload limiter
2) Lifting limit switch, traveling limit switch
3) Audible alarm device for warning during crane working time
4) Anti collision device(limit switch,infrared ray limit switch,laser limit switch) to avoid crane collision
5) Over currency protection,zero position protection,Emergency stop button
6) Motor thermal protection, motor with heater.