| 摘要 |
A position drive that includes a block of programmed control (PC) with electric outputs, block of discrete distribution with electric control inputs (DDEC) that has channels for feeding, discharge and working channels, block for dosig working fluid (DWF) that includes supercharge, discharge and working channels, reversing block with electric control inputs (ECI) that has supercharge, discharge and working channels, and executive device with movable element and two working channels, at that to the feeding and discharge channels of the DDEC block the output and the input of the working medium feeding source are connected, respectively, working channels of the DDEC block are connected to the working channels of the DWF block, supercharge channel of the DWF block is connected to the supercharge channel of the ECI block, and the discharge channel of the DWF block is connected to the discharge channel of the ECI block, working channels of the ECI block are connected to the working channels of the executive device, and electric outputs of the PC block are connected to electric control inputs of the DDEC and ECI blocks. To provide higher accuracy of control and its independence from required position of the movable element of the executive device, for simplification of construction, increase of force at movable element and provision of independence of the force from the control signal, the DDEC block is arranged as a three-position four-channel distributor and the DWF block is arranged as a multiplier, function of the ECI block is carried out by three-position four-channel hydro-distributor, and to the discharge channel of the DWF block feeding tank is connected. |
