Experimental Determination of the Load of Mounted Working Bodies, Aggregated with Tractors

Abstract

AbstractThe characteristics of a tractor unit are determined by the drag indicators of the towed agricultural machine, which require experimental determination. Experimental determination of the working bodies loading requires the use of a system of sensors of forces acting on the working bodies in different planes. Common disadvantages of known devices that provide measurements during volumetric dynamometry of working bodies of tillage machines are the complexity of the design and high measurement error. Force sensors are manufactured mainly using strain gauges that are glued directly to the loaded parts. To determine the forces in the traction of the hydraulic suspension system of tractors, strain gauge fingers are used. Calibration of force sensors is usually carried out individually on special stands. The best calibration results will be achieved when all strain gauges are installed in their proper positions and all sensors are calibrated simultaneously. The design and technological scheme of the device is proposed, the kinematic scheme of which allows using a single measuring device. This technical solution simplifies the technology of measuring the force on the working body and increases its accuracy. Analytical expressions for calculating the main design parameters are given. The results of experimental calibration of the proposed device when changing the thickness of the adjustment washers are presented. The proposed device reduces the error when measuring the total horizontal force on the tractor, acting from the side of the mounted tool or trailer.