| 摘要 |
<p>The trucks running on the mine railway are cleared of sticky fragments by coupling a vibrator to them. Usually the vibrator has been connected at a special point of the truck, where one half of a coupling has been fitted for it. In the new arrangement, the coupling is by an electromagnet (2) connected to the vibrator (3). Not only does this render the special fittings on the trucks unnecessary, but it allows the vibrator to be applied at whatever point of the truck current experience suggests is best. The vibrator and magnet are mounted on a wheeled trolley (6) and are operated by mains electricity.</p> |
