Load ejection improvement for self-loading scrapers

Abstract

A control system for the hydraulically powered .Iadd.conveyor, such as an .Iaddend.auger.Iadd., .Iaddend.of a self-loading .[.auger.]. scraper that has an ejector operated by a hydraulic cylinder. One manual control valve starts and stops the auger in conjunction with loading. A second manual control valve powers the ejector cylinder and simultaneously operates a valve to start the auger independently of the first manual control valve.

What is claimed is: 
     
       1. In a self-loading auger scraper that includes a scraper bowl, a generally upright auger mounted in the forward portion of the bowl, a hydraulic motor for driving the auger, an ejector mechanism including a generally upright ejector member and a hydraulic cylinder for reciprocating the ejector member between the rear of the bowl and the front of the bowl, a fluid reservoir, first pump means for supplying fluid under pressure from the reservoir to the ejector cylinder, second pump means for supplying fluid under pressure from said reservoir to the auger motor, and a control system that includes a first manually actuated valve for directing the output of said second pump means selectively to the auger motor or to the reservoir and a second manually actuated valve which is movable between a first position in which fluid from the first pump is blocked from the ejector cylinder and a second position in which such fluid flows to said cylinder to move the ejector member, means for driving the auger when the ejector member is operated comprising, in combination: a drain line which is open to the reservoir when the auger motor is idle and which is closed to cause the output of the second pump means to be directed to the auger motor;   a first normally open valve in said drain line;   and means controlled by movement of the second manually actuated valve from its first position to its second position for closing said normally open valve.   
     
     
       2. The combination of claim 1 in which the normally open valve is solenoid operated, and the means controlled by movement of the second manually actuated valve comprises a normally open switch in an energizing circuit for said solenoid, and means for closing said switch in response to movement of said second manually actuated valve. 
     
     
       3. The combination of claim 2 in which the switch is a limit switch and the means for closing said switch is mounted on the manual actuator for the second valve. 
     
     
       4. The combination of claim 1 in which the control system for the auger motor includes a normally open, pilot operated auger control valve, an unloading valve which is normally open to connect the second pump means to the reservoir and which has a signal line that is open to said drain line through said pilot operated valve, in which the first manually actuated valve is a pilot selector valve which is movable from a first position to a second position to pressurize a pilot line for said auger control valve, and thereby close said valve to isolate said signal line from the drain line and thus close the unloading valve, the normally open valve in the drain line being in series with said normally open auger control valve. 
     
     
       5. The combination of claim 1 which includes a second normally open valve in the drain line in series with the first normally open valve in said line, and an operative connection between said first manually actuated valve and said second normally open valve to close the latter valve upon manual actuation of the former valve. .Iadd. 6. In a self-loading scraper that includes a scraper bowl, a generally upright loading assist mounted in the forward portion of the bowl, a hydraulic motor for driving the loading assist, an ejector mechanism including a generally upright ejector member and a hydraulic cylinder for reciprocating the ejector member between the rear of the bowl and the front of the bowl, a fluid reservoir, first pump means for supplying fluid under pressure from the reservoir to the ejector cylinder, second pump means for supplying fluid under pressure from said reservoir to the hydraulic motor, and a control system that includes a first manually actuated valve for directing the output of said second pump means selectively to the hydraulic motor or to the reservoir and a second manually actuated valve which is movable between a first position in which fluid from the first pump is blocked from the ejector cylinder and a second position in which such fluid flows to said cylinder to move the ejector member, means for driving the loading assist when the ejector member is operated comprising, in combination: a drain line which is open to the reservoir when the hydraulic motor is idle and which is closed to cause the output of the second pump means to be directed to the hydraulic motor;   a first normally open valve in said drain line;   and means controlled by movement of the second manually actuated valve from its first position to its second position for closing said normally open valve. .Iaddend.