Substantiation of a perspective scheme of a crank hydraulic motor for a hydraulic drive of a turntable of a logging truck manipulator

Abstract

The task of increasing the efficiency of hydraulic manipulators with traditional column turning mechanisms installed on logging road trains can be solved by installing column turning mechanisms with crank hydraulic motors from hydraulic cylinders. Variants of the arrangement of hydraulic cylinders in a crank hydraulic motor were studied graph analytically by determining tangential and radial forces acting on the rotary column of the hydraulic manipulator. At first, calculations were performed based on static methods to evaluate the effect of forces on the rods of hydraulic cylinders in the working positions of the column rotation mechanism. After that, using the COMPASS computer-aided design system, circular diagrams of tangential and radial forces of the considered options for the arrangement of hydraulic cylinders in a crank hydraulic motor were constructed. Further, in the Microsoft Excel program, graphs of changes in tangential forces acting on the rotary column of the hydraulic manipulator were plotted. Schemes with five and six hydraulic cylinders have the best option of influencing the bearings in which the column is rotated. The ranges of radial forces for them ranged, respectively, from 3.32 to 22.07 kN and from 11.175 to 11.297 kN, and tangential forces – from 257.893 to 285.274 kN, and from 300.471 to 354.059 kN, which can be used in the design of new drive designs for turning columns of hydraulic manipulators. For the practical implementation of the proposed design of the crank hydraulic motor, it is planned to make a rational choice of the location of the hydraulic cylinders of the crank hydraulic motor on the frame of the logging road train on the basis of simulation modeling.