perfect bulk truck crane slewing bearing

1.Introduction to the basic knowledge of crane slewing bearing

What is the definition of crane slewing bearing?

Slewing bearing, also known as slewing bearing, is a mechanical force transmission basic element that needs to rotate relative to each other between two parts of various machines and simultaneously bear axial force, radial force and overturning moment.

The basic function of the crane slewing bearing is to transmit force and drive, and realize the relative rotation between the two parts of the mechanical equipment. The crane is usually an upper and lower structure in which the working device (turntable) and the chassis can rotate relative to each other, and its connection mechanism is naturally inseparable from the slewing bearing.

What are the types and main performance characteristics of slewing bearings?

1. Cross-roller slewing bearing: the main type of small and medium-sized slewing bearings in the 1980s and 1990s, due to the inherent defects of the structure type, the actual bearing capacity is far from the theoretical value, and has been completely replaced by single-row ball slewing bearings.

2) Single-row ball slewing bearing: with a row of steel balls as rolling elements, the steel balls are in contact with the raceway at four points, and can bear axial force, radial force and overturning moment at the same time, it is a small and medium-sized slewing bearing with a diameter of less than 2000mm Preferred product.

3) Double row reducing ball crane slewing bearing: the contact angle of the upper volleyball is 90 degrees, the three-piece structure, and the cross-sectional size is much larger than that of the single volleyball. , Universal double-row ball slewing bearing.

4) Three-row column slewing bearing: suitable for larger loads, it is the most cost-effective among crane slewing bearings with a diameter greater than 2000mm

5) Double-row 8-point contact ball slewing bearing: equivalent to the combination of two single-row balls, it is the first choice for the host requiring heavy load and limited radial structure size.

6) Ball-Roller combined crane slewing bearing: suitable for working occasions with large axial load and small overturning moment and radial load.

2.What should be paid attention to when installing the crane slewing bearing？

(1) The tempering belt of the ring gear (at the outer mark “S”) and the place where the steel ball loading and unloading holes are blocked should be placed in the non-load area or light load area.

(2) The installation platform must be clean and flat, without iron filings, burrs or other debris, and its flatness should meet the regulations

(3) The mounting bracket must have sufficient rigidity to prevent the crane slewing bearing from being deformed due to insufficient rigidity of the bracket, resulting in the slewing bearing not working properly. Under the action of rated load, the support plane should meet the requirements of relevant standards.

(4) Note on gear installation: ensure that the central axes of the large and small gears are parallel. The pinion must be assembled from the mark of the highest point of the tooth jump of the large gear of the slewing bearing (the green mark), and the backlash between the gear and the pinion at this point should not be less than the specified value.

(5) Comply with the selection and installation requirements of bolts for crane slewing bearings.