Introduction to the theory of bridge cranes

Bridge crane - This is a loading machine moving along a steel structure, called the bridge. He provides transportation of cargo in three directions and is a common type of production mechanization, as it does not occupy the area of \u200b\u200bthe workshop, moving along the bridge, and provides maintenance of any point. This type of lifting machine can work in a closed and open area, can be used on power plants, factories.
Bridge cranes are classified by design (support, suspended, gantry) and for carrying capacity. The drive is electric and manual. They are also separated by the type of bridges on single-ground and two-bit.
Bridge crane has a bridge from beams or lattice. The bridge at the ends is equipped with transverse beams on which the wheels are located. The trolley with the lifting mechanism is moving along the bridge. The cargo trolley is made of beam frame.
Also bridge cranes are hooks (cable tails are used as a trolley), magnetic (on the crane hook, a magnet is suspended), graoning (loading device - grab). The lifting mechanism is the Tal. To select a loading mechanism, it is necessary to analyze the key points of the cargo with which the crane will work.
The so-called crane beams consist of a beam fixed on the end beam with wheels. Repair crane beams is current and capital. Most often, electrical equipment and mechanical nodes (gears, shafts, movement mechanisms) are faced. In the modern market, there are many enterprises engaged in the repair of cranes that not only produce installation, but also manufactures metal structures, design work drawings, carry out calculations, set radio control. Current repairs include testing of keypone and bolted compounds, gears, movement mechanisms, lubrication of all driving surfaces. Maintenance must be carried out on time to avoid emergency situations.
The repair of electrical equipment of the cranes involves verification of effort, switches, controllers, electrical contacts, control relays, magnetic systems, measurement of resistance, electrical wiring.