| 摘要 |
Grinding stones of a mobile railroad rail grinder are arranged in pairs in grinding units that are themselves mounted in pairs in grinding modules pivotally mounted at both ends and on both sides of a central cab unit of the vehicle. The modules are pivotable between raised and operative positions in which the stones contact the upper rail head surfaces. The vehicle is self-propelled and an underspeed detector raises the modules part way, enough to move the stones out of contact with the rails, if the vehicle speed diminishes below a minimum. The grinding stones move up and down in pairs, the downward movement being restricted by dash pots to a very slow travel. These features enable the stones to span a trough in the rail head surface and to grind metal only from the higher points thus helping to eliminate rail depressions.
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