| 摘要 |
<p>A backhoe operated bucket (10) is provided with an opening containing a screen frame opposite its scraper blade, with a loading opening for separating coarse material contained in the soil excavated from a pipeline ditch (16), and depositing fine padding soil (20) on a pipeline (18) in the ditch (16). A motor driven eccentric supported by the screen frame vibrates the screen frame in several directions to achieve a separation of fine and coarse material, the latter being deposited in the ditch (16) above the padding soil.</p> |
