QTBJ Type Crane Variable amplitude MechanismDetailed product description：

The QTBJ crane slewing mechanism consists of a YLEW torque motor, an embedded high-precision, hard toothed planetary gear reducer, a drum frame assembly, and a limiter. It has the characteristics of compact structure, smooth operation, high transmission efficiency, low noise, reliable braking, accurate positioning, easy installation, and long service life. It is an ideal replacement product for the variable amplitude mechanism of large, medium and small tower cranes.

QTBP Variable Amplitude Mechanism Parameter Table

model	Motor stalling torque Nm	Equipped with torque motor model	rated traction N	Rated amplitude speed m/min	capacity of rope m	Applicable tower crane models Tm
QTBP-95	ninety-five	YLEW112-4-95	five thousand and four hundred	fifty-six	sixty-three	80，125，160 F0/23B
QTBP-120	one hundred and twenty	YLEW112-4-120	seven thousand and nine hundred	forty-seven point five	seventy-four	200，250，300 H3/36B，7030

Installation dimensions of QTBP variable amplitude mechanism

model	φD	L	L1	L3	A	B	H	H1	φd	h
QTBP-95	three hundred and seventy	five hundred and ten	six hundred and twelve	one thousand three hundred and eighty-seven	three hundred	four hundred and ninety-seven	two hundred and five	four hundred and ninety-one	twenty-six	thirty
QTBP-120	five hundred and twenty-one	five hundred and fifty-four	six hundred and seventy-six	one thousand four hundred and twenty-three	four hundred and ninety-eight	five hundred and eighty-two	three hundred and twenty	seven hundred and twenty-five	twenty-two	forty