Browsing by Author "Dobrin, Dănică"

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    Mechatronic positioning system with the velocity control
    (Видавництво Національного університету "Львівська політехніка", 2002) Drumea, Petrin; Comes, Mircea; Mirea, Adrian; Dobrin, Dănică; Hydraulic and Pneumatic Research Institute, Bucharest, Romania
    This paper presents a mechatronic system for speed control in non-ferrous continuos foundry machine. This system uses a hydraulic cylinder with inductive displacement transducer, a proportional valve and an electronic module. The moving control uses a positioning closed loop. The electronic block assures position and velocity control and the stop time, too. The cylinder’s displacement is cyclical due an automatic programmer that commands the fastening cylinder, too. User can program both directions’ speed, stroke and pause time. A smooth starting move is assured by acceleration control. The electronic control module is placed in case of proportional element. The program unit contains 8 multi-turn potentiometers for setting motions program, start/stop switch and light Indicator of moving status.
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    Mechatronic system for pressure control
    (Видавництво Національного університету "Львівська політехніка", 2002) Drumea, Petrin; Comes, Mircea; Mirea, Adrian; Dobrin, Dănică; Hydraulic and Pneumatic Research Institute, Bucharest, Romania
    The mechatronic system, that has been presented in this article, is a force adjustment system through pressure control. As a practical application of this system is the adjustment of the pressing force on a technological line for manufacturing rubber carpets on a textile support. The main condition, required by the technologic process, is to maintain a constant value for the pressing force during the entire process, in order to maintain a constant thickness of the rubber carpet. The mechatronic system is formed from two sub-systems, a hydraulic actuating subsystem and an electronic driving system (servo-controller). The electric signals from the transducers are sent to the servo-controller, for processing. The servo-controller compares the signals with pre-programmed values and drives the electromagnets from the proportional directional valve. By driving the proportional directional valve, the hydraulic system is driving the hydraulic cylinder, resulting the real pressing force, required by the parameters of the technological process.