L68A1 Mast Section The working principle and function of the tower crane lifting moment limiter key words: the Tower Crane Lifting Moment limiter
during the use of the tower crane, we need to know more about the various parts of the tower crane To ensure smooth operation. This paper introduces the working principle and function of the lifting moment limiter of the lower tower crane. A structure and working principle, lifting moment limiter is divided into mechanical and electronic, mechanical and there are a variety of slalom and pantograph. The bow-plate type lifting moment limiter is widely used at present because of its simple structure.
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The bow-plate moment limiter is mainly installed on the main chord of the tower cap. The working principle is as follows: when the tower crane is carrying heavy objects, the main chord of the tower cap is compressed due to the action of load, and the larger the load, the larger the deformation. The moment limiter is then deformed by the bow steel plate. The deformation of the chord is enlarged, and the distance between the adjusting bolt and the limit switch on the pantograph is gradually reduced with the increase of load. When the load reaches the rated load, the power supply of the lifting mechanism and the luffing mechanism can be cut off by adjusting the bolt to trigger the limit switch, so as to limit the lifting moment load of the tower crane. The lifting moment limiter is one of the important safety devices of Taidao. The structural calculation and stability checking of the tower crane are based on the maximum rated lifting moment The function of moment limiter is to control the maximum rated lifting moment of tower crane and prevent overload. The current National Standard `TowerrCraneeSafetyyCodee" stipulates:TowerrCranee should be installed lifting moment limiter. When the lifting moment is greater than the rated value and less than 110% of the rated value, the power supply in the rising and increasing direction should be cut off. The moment limiter only limits the lifting of the gravity moment in the vertical plane of the tower crane when overloading But the tipping moment in the horizontal plane caused by the hook side slanting load, the wind load in the horizontal plane, the inclination of the track and the collapse is not effective, so the operators must strictly abide by the safety operation rules You can't work against the rules.
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