Abstract

The main bearing of the rotating drum (MBRD) used in a concrete mixing truck is usually a double row spherical roller bearing. The forces of the bearing are affected by many factors when working, and it is difficult to calculate the roller load. In the past, the researches on the mechanical properties of this specially used bearing are few. In this paper, the main bearing of the rotating drum of a certain type of concrete mixing truck is studied. A method for calculating the concrete distribution pattern in the rotary drum is developed with considering the different rotating speeds, incline angles and concrete liquid levels. Then, the force balance equations are established to get the radial load and axial load acting on the main bearing. A mechanical model for MBRD has been derived with considering bearing’s radial load, axial load and inner ring tilting angle. The effects of mixing drum’s rotating speed and inner ring tilting angle on the radial displacement, axis center orbit and rollers loads of MBRD are studied when the mixing drum is empty. The effects of mixing drum’s rotating speed, concrete liquid level, rotating drum’s incline angle and bearing’s inner ring tilting angle on MBRD’s radial displacement, axis center orbit, rollers loads are also studied when the mixing drum is filled with concrete. A series of relationship curves are obtained and analyzed.

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