| 摘要 |
The invention relates to a hydraulic drive, especially for two-cylinder thick matter pumps. Said hydraulic drive comprises at least one main pump ( 10 ) embodied as a hydraulic variable displacement pump, and two hydraulically actuatable drive cylinders ( 20, 22 ) that are each connected to a connection line ( 16, 18 ) of the main pump ( 10 ) by means of pump connections mounted on one end thereof, forming a closed hydraulic circuit, and communicate with each other at the ends thereof opposing the pump connections ( 24, 26 ) by means of a swinging oil line ( 28 ). The hydraulic drive also comprises a feed pump ( 42 ), by which means pressurized oil is fed from an oil tank to the current low-pressure side into the hydraulic circuit, and a flushing branch ( 52 ), by which means a flushing oil flow is branched off from the current low-pressure side under a limited pressure into the oil tank ( 44 ). In order to avoid low-pressure influxes during the reversal process of the main pump ( 10 ), the flushing oil flow is blocked and then released in a time-delayed manner during each reversal process of the main pump ( 10 ), independently of the differential pressure in the connection lines.
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