The application, of the torque limited hydraulic coupler in slewing mechanism of tower crane

　　Tower crane jib is long, radius of gyration is big, running slightly evil, with changes in wind direction, wind speed and weight changes, turning resistance moment changed greatly, as there is no overload protection, motor, reducer is often damaged. So, the QT20~QT100 tower crane almost entirely with hydraulic cam and groove coupling transmission. Effect of hydraulic cam and groove coupling in the slewing mechanism of tower crane has two.

　　Play light load start, overload protection function of the rotary mechanism of tower crane in the starting and overload does not damage the motor and reducer, reduce the impact and vibration in high winds start, overload protection, motor, reducer is not damaged.

　　Play a balancing machine load function: QT60 type tower crane slewing mechanism above sometimes uses double driving. Two motors with two cam and groove coupling through two reducer driven rotary tower crane, application of hydraulic cam and groove coupling can coordinate the two motor synchronous operation, equilibrium output.

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