Trends in the development of control systems for adaptive mounted hydraulic conveyor belt drive

Abstract

Belt conveyors used in construction, food and mining industries, mechanical engineering, logistics, agriculture, in particular in agricultural mobile machinery, operate under conditions of non-constant and variable loads. The working load on the work-ing link is characterized by high unevenness and can exceed more than twice the nominal. Such load modes, perceived by the drive, cause the operation of safety valves in hydraulic drives and emergency stop of the conveyor, and in electric drives that are not equipped with a limit torque clutch, breakage of its structural elements. The paper presents trends in the development of control systems for an adaptive built-in hydraulic drive of a belt conveyor, which is designed according to a scheme with torque redundancy, in the context of solving technical problems that arise during the operation of these vehicles. The structural diagrams of control systems for adaptive hydraulic drives based on direct and indirect valves are presented, which automatical-ly turn on an additional hydraulic motor when the pressure exceeds the set value, and turn it off when it drops to the sensor setting value. The main results of theoretical studies of such mechanical systems are presented, which show the effectiveness of their application in the corresponding operating modes of vehicles, in particular on such mobile machines as a paver. A new hydrokinematic drive diagram has been developed for the control system for stabilizing the speed of the conveyor belt, the shut-off and distribution device of which is equipped with a special reed switch type sensor, which provides control of the sup-ply of working fluid from the additional pump to the injection hydraulic line of the hydraulic system when the load increases to the value for which the control device sensor is set. Thus, in overload conditions, continuous operation of the conveyor is en-sured and a stable speed of the belt is maintained by regulating the flow rate of the working fluid, which contributes to increas-ing its performance.