| 摘要 |
A crop harvesting machine including a header mounted on a tractor is hydraulically driven by a pair of pumps on the tractor and a series of motors on the header. A first circuit control includes variable rate valves controlling the rate of supply of fluid from the unidirectional pumps to the motors to vary rate of the knife, conditioner, reel and converging systems in a forward harvesting direction. A second circuit controls reverse rotation of at least some of the elements for releasing a blockage by taking the fluid from one of the pumps and passing it through the separate second circuit to the required motors in series. The second circuit is provided in a separate block which can be omitted and thus constitutes an option. The drive of the motors in reverse direction in series ensures that they are driven at common speed without need from individual speed control. The use of unidirectional pumps and the separate circuits for forward and reverse allows the use of a single return and a filter at the return which is advantageous in a system which allows disconnection of couplings to allow the header to be replaced.
|
