FLUID CIRCUIT FOR BALE EJECTION WITH RESTRICTED FLOW

摘要

The present invention relates to a hydraulic circuit mechanically linked to a panel and agricultural harvesters comprising the same. The hydraulic circuit of the present invention can be used to facilitate the transition of hydraulic states from a quick speed to a slow speed, when opening and closing the panel. The hydraulic circuit comprises a fluid stop valve comprising a restrictive orifice which, when narrowed, reduces the rate of pressurized fluid flow into a hydraulic actuator during the actuator's extension. The reduced flow of pressurized fluid into the hydraulic cylinder substantially reduces the speed at which the panel opens or closes.

主权项

1. An agricultural harvester comprising:
a baling chamber comprising a bale outlet and a tailgate at a rear section of the baling chamber, the tailgate movable between a closed and one or more open positions and obstructing the bale outlet in its closed position; at least one actuator mechanically linked to the tailgate, the at least one actuator capable of moving the tailgate between the closed and one or more open positions and having at least a first fluid opening on one end of the actuator, wherein the first fluid opening feeds and/or returns pressurized fluid into a hydraulic circuit, the hydraulic circuit comprising:
a source of pressurized fluid in fluid communication with at least the first opening for supplying fluid to and returning fluid from the actuator in the hydraulic circuit;at least one fluid stop valve in fluid communication with the hydraulic circuit; andat least one fluid controller that controls the flow of pressurized fluid through the fluid stop valve from the source of pressurized fluid or from the at least one actuator; wherein the tailgate moves from a closed position to one or more open positions in a first and a second hydraulic state; whereby, in the first hydraulic state, the stop valve is open allowing pressurized fluid from the source of pressurized fluid to enter the first fluid opening; and, whereby, in the second hydraulic state, a restrictive orifice in the fluid stop valve is at least partially narrowed or closed thereby reducing the rate of flow of pressurized fluid from the source of the pressurized fluid through the at least one fluid stop valve and substantially reducing and/or stopping movement of the at least one actuator.