What types of slewing drive are there?

Slewing drive can be widely used in heavy flatbed transport vehicles, container cranes, truck cranes, aerial vehicles, solar power system patrol and other construction machinery and new energy fields. Slewing drive can be basically divided into single worm drive and double worm drive. This article focuses on what types of slewing drive are there.

The following knowledge points are listed below:

Types of slewing drive

Mechanism components of slewing drive 

Driver of slewing drive

1. Types of slewing drive

According to the variable speed drive of the slewing drive form, can be divided into type slewing drive and the slewing drive type worm gear and worm, inherit the characteristics of gear transmission and worm gear and worm drive each, are both the slewing drive can be adapted to high speed and low speed applications, in terms of bearing capacity, performance is superior to the tooth worm gear and worm type, and when envelope worm drive is used, its bearing capacity, deformation resistance and transmission have further improve rigidity,But the worm slewing drive is less efficient than the tooth slewing drive.

Slewing drive can be divided into open type and closed type according to the open division of slewing drive drive sub-mechanism.  Usually, the open type structure is mostly used in the application of harsh environment and short maintenance and maintenance cycle.  The open type structure is more convenient for inspection, maintenance and maintenance of machine parts, as well as for replacement. The closed structure can provide a longer maintenance life cycle when the environmental conditions are not changing much and the environmental pollution level is below the medium level.

2. Mechanism components of slewing drive 

Slewing mechanism usually consists of slewing support device and slewing drive device. The slewing support device is used to connect the slewing part of the crane with the non-slewing part, and to provide the constraints required by slewing movement to ensure that the slewing part has certain movement. At the same time, it provides a stable support for the slewing part to withstand the vertical load, horizontal load and overturning moment from the slewing part. Slewing drive is used to drive a slewing motion relative to a non-slewing motion.

3. Driver of slewing drive

In general, the slewing drive consists of the following three parts:

(1) Slewing drive's active machine, such as electric motor in electric drive, hydraulic motor in hydraulic drive (including hydraulic power source), internal combustion engine in internal combustion engine drive, etc.

(2) The transmission device of slewing drive mainly includes deceleration, reversing and braking devices.

(3) The slewing drive's slewing pinion meshes with the large ring of teeth on the slewing support device to realize the slewing movement of the slewing part.

In order to ensure the reliable operation of the rotating machinery and prevent overload, it is generally necessary to install a limit torque limiter in the transmission system. Most active machines use electric motors, but most mobile slewing cranes use internal combustion engines. Slewing drive components are mostly gear (or needle wheel), but some cranes are driven by roller or rope traction.

Depending on the crane's use and construction, the slewing drive can be arranged in two ways:

The driving part is mounted on the slewing part of the crane, and the last stage of the large gear ring (or needle wheel) is mounted on the rack of the non-slewing part.  In the slewing mechanism of the port crane, this form is mostly adopted.

The driving part is mounted on the non-rotating part of the crane, and the last stage of the large gear ring (or needle wheel) is mounted on the rotating part of the crane, which is sometimes used in some large fixed column cranes and tower cranes.

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