PROBLEMS OF ENGINES SYNCHRONIZATION IN HYDRAULIC UNIT

Abstract

The efficiency of using modern technological equipment, which is a complex automated complex with a large number of executive bodies, largely depends on the ability to predict the characteristics of power drives as a part of this equipment. In the overwhelming majority of modern technological machines for the use of working bodies, hydraulic systems  which develop significant efforts at small dimensions and masses are used. For some technological processes it is necessary to ensure the synchronization of the movements of several working bodies.

Therefore, the study of the hydraulic drive, which provides synchronization of the transfer of working units of process equipment, is an actual scientific problem, which has practical application in the industry.

The synchronization of the movement of working bodies is an ensuring of  strictly coordinated in time of their movements, speeds, accelerations. Since the working bodies of the hydraulic drive are considered, this is about the synchronization of displacement of hydraulic motors.

The work of a multi-engine hydraulic unit, in which it is necessary to ensure the synchronous movement of two hydraulic motors moving on a joint load, is considered. The analysis of the schemes of hydraulic motors   synchronization is carried out. Factors which influence on the coordination of movement of the source segments of engines (hydrocylinder stocks, rotors of hydraulic motors) are considered. The schemes of synchronization of hydraulic motors with throttle and volume flow dividers are presented. An estimation of errors of engines synchronization in the established modes of operation of the hydraulic unit is carried out.

The considered schemes of hydraulic motors synchronization are characterized by a constant error of hydraulic motors speed in the steady state. It has been established that in the case of asymmetric load, the synchronization error at the position of the hydraulic motor starting point is proportional to the displacement (time of motion).

The tasks for improving the process of synchronization of hydraulic motors motion in a multi-engine hydraulic unit are set.