| 摘要 |
A control system for a tailgate on a round bale wagon is disclosed wherein the tailgate is maintained in an upright position to keep bales on the load bed of the vehicle until the forward end of the load bed has been raised sufficiently to impart enough energy to the bales to enable them to be more easily unloaded off the rearward end of the load bed. The control system includes an actuation mechanism that is engageable with the main frame upon the rotation of the load bed relative to the main frame to shift the spool of a control valve to permit hydraulic fluid to escape from the hydraulic cylinder operatively powering the movement of the tailgate to the upright position. The weight of the bales on the tailgate presents sufficient force to cause the tailgate to move to an extended position and, thereby, extend the ram from the hydraulic cylinder, forcing fluid from the cylinder. Movement of the load bed back to the home position, generally parallel to the main frame, causes the spring loaded actuation mechanism to operatively disengage from the main frame and effect a shifting of the control valve spool to permit fluid to flow back to the hydraulic cylinder and effect a retraction of the ram and movement of the tailgate back to the upright position.
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