PROCEDURE FOR POSITIONING HYDRO-TECHNICAL GATE Russian patent published in 2011 - IPC F16K3/32 F15B21/02 

FIELD: machine building.

SUBSTANCE: pressure gauge is preliminary set on pressure-drain main. An output of the pressure gauge is connected to a programmed controller. Pressure value is controlled in the pressure-drain main by means of the pressure gauge. A rod of the hydro-cylinder is equipped with a velocity sensor of hydro-technical gate displacement attached to it and with a position sensor of the hydro-technical gate, outputs of which are connected to inputs of the controller. Due to system feedback hydro-cylinder rod required positioning is performed by means of the above said sensors, programmed controller and frequency controller. At hydro-technical gate rise for displacement upward from a sensor programmed terminal, first there is commanded rise of the hydro-technical gate. For this purpose pressure is built to a specified value with a pump in the pressure-drain main. Pressure rise to a specified value is controlled with the pressure gauge. By means of commands of programmed controller there is maintained specified pressure in the pressure-drain main. Thus, rotation frequency of an electric engine shaft is changed under the piston of the power hydro-cylinder by means of a frequency converter on base of obtained information, and, consequently, there is changed output of the pump. Further rise is performed at constant values of pressure programmed with pressure controller in the pressure-drain main to overcome high loads of dry friction type. This mode of motion of the hydro-technical gate is carried out to a moment of controller receiving a signal from the position sensor of the hydro-technical gate on hydro-technical gate coming out from contact with packing, which corresponds to a position of complete hydro-technical gate opening. Further, rise of the hydro-technical gate is continued at required specified constant rate; by command of the programmed controller motion rate of the hydro-technical gate is successively changed to a mode of decreased rate to 0.1-0.2 Vc, where Vc is constant rate of displacement of the hydro-technical gate before its braking at position of the hydro-technical gate at height 0.95-0.97 H, where H is height of rise of the hydro-technical gate specified from the programmed terminal. When this height is reached, the programmed controller commands the frequency converter to turn on an electric brake and to stop the hydro-technical gate in a specified position. Motion of the hydro-technical gate downward is performed by drain of working substance from under the piston of the power hydro-cylinder through the pump-drain main and the pump operating under a motor mode at this moment. By stabilisation of flow rate of working substance in the pressure-drain main there is maintained specified rate of hydro-technical gate motion downward according to a command from the programmed terminal by means of the programmed controller governing the frequency converter. The sensor of velocity of hydro-technical gate displacement controls displacement of the hydro-technical gate. By readings of this sensor rate of displacement of the hydro-technical gate and its stop in a lowermost position are regulated with the programmed controller.

EFFECT: improved procedure.

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