| 摘要 |
Device for control of movement of a hydraulic actuating shaft, controlled by numerical control (CNC) in machine tools, which is incorporated via a four-way servovalve 1 with four positions (control, rest, forward and reverse), causing the cylinder of the shaft 2 to actuate to a position combined with a linear (or rotary) position sensor which measures the actual position of the displaced shaft and sends the information to the CNC 4, which supplies the servovalve, making it operate in order to produce, on the shaft 2, the practical movement corresponding to the fulfilling of the theoretical programme. <IMAGE>
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