Excavators, also known as excavators, are indispensable mechanical vehicles in engineering construction. The use of buckets to excavate earthwork and materials that need to be cleaned has greatly accelerated the construction progress and efficiency. When the hydraulic excavator is working, the slewing mechanism needs to be frequently the reciprocating action to make the bucket work.

It can be seen that the slewing mechanism is an important part of the hydraulic excavator. So, do you know the composition and working principle of the hydraulic excavator slewing mechanism?

The composition of the excavator slewing mechanism

Excavator slewing bearing

The excavator slewing mechanism is mainly composed of a slewing brake, a slewing reducer, a slewing bearing and a slewing hydraulic system.

1. Swing brake

The swing brake is set on the swing reducer and controlled by the swing hydraulic system. The structure of various excavator brakes is different, but the principle is basically the same. Taking a certain type of hydraulic excavator as an example, its rotary brake adopts normally closed, spring clamping, multi-disc, wet brake. When the excavator turntable stops rotating, the brake is applied to brake. When the turntable rotates, the hydraulic system pilot pressure oil pushes the brake. The moving piston compresses the spring to release the brake.

2. Rotary reducer

The slewing reducer is fixed on the turntable and is connected with the output shaft of the slewing motor. The output shaft of the slewing reducer is provided with a pinion, and the slewing bearing is provided with an inner gear ring. When the slewing motor drives the slewing reducer to rotate, the pinion mounted on the output shaft of the slewing reducer meshes with the ring gear of the slewing bearing. The revolving motion of the gear drives the turntable and the upper working device to rotate together.

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