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QTZ４０型塔式起重机的回转运动是将电动机正、反方向的转矩通过液力偶合器传至减速器输出轴的驱动齿轮，驱动齿轮与固定在塔身上的齿环啮合，由齿环上的反推扭矩推动减速器与塔尖一起绕齿环中心回转，如图１所示。原回转机构是用电液制动推杆或电磁钢片离合器进行制动，工作状
QTZ40 tower crane rotary motion is the motor positive and negative torque through the hydraulic coupling to the reducer output shaft drive gear, the drive gear and the fixed gear tower in the ring, the ring by the Anti-push torque to promote the reducer with the spire around the ring around the center of rotation, as shown in Figure 1. The original rotary mechanism is the use of electro-hydraulic brake lever or electromagnetic steel clutch for braking, work-like