Excavating – Ditcher – Condition responsive
Patent
1997-01-10
1998-07-28
Melius, Terry Lee
Excavating
Ditcher
Condition responsive
701 50, 91516, E02F 502
Patent
active
057848122
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for the positionally correct placement of an operating tool, in particular a scoop, tiltably disposed on a descending lift frame of a mobile machine, in particular a wheeled loader.
BACKGROUND OF THE INVENTION
Mobile machines, in particular wheeled loaders, have operating equipment, in particular scoops, which are seated on the frame of the machine by means of a lifting frame which can be raised and lowered. It is as a rule sensible in connection with the normal operating state of the machine, in particular the wheeled loader, that the operating equipment, in particular the scoop, has reached a position following the lowering of the lifting frame, which allows problem-free further operation without involved corrections by the driver. As a rule, this position is one which extends approximately parallel with the surface to be worked. In many cases mobile machines are provided with an automatic return for the operating equipment, in particular the scoop, which, following activation preferably by pushing a button, in the course of lowering of the lifting frame brings the operating equipment back into the predetermined operating position, in particular scooping. Because of the different conditions during the switching time of the valves, mainly because of the pump conveying stream which changes within wide margins because of the rpm of the Diesel engine, this return operates inaccurately, i.e. the angle at which the working equipment, in particular the scoop bottom, comes to rest on the ground fluctuates so strongly that for setting the most favorable cutting angle into the material, the driver has to make corrections from one instant to the next.
A scoop loader device on any arbitrary operating vehicle is known from DE-A 41 28 959, wherein at least one tilting cylinder is hinged at one end on the loader frame above the loading rocker, and at the other end on a tilting lever which is pivotable on the loading rocker, to form a parallel kinematic arrangement which maintains the loading scoop, which is indirectly connected with the tilting lever, in its pivot position, open towards the top, evenly over the entire lifting range of the loading rocker. The tilting cylinder has an extended piston rod section passed through the cylinder bottom, whose length corresponds at least to that of the piston stroke, and to which an appropriate receptacle, which is fastened to the cylinder and provided with a bearing eye and with lateral access for replacing the seals of the cylinder bottom, is assigned. The extended piston rod constitutes a path-measuring member for a connectable electro-hydraulic control, by means of which the cylinder adjustment movement or the tilting movement of the loading scoop is stopped at a defined position which, in particular, corresponds to its pick-up position, wherein the scoop bottom generally extends parallel with the driving plane. Analogous with the general prior art described at the outset, this return system for the lifting frame also operates inaccurately in view of the different switching times of the valves because of the continuously changing rpm of the Diesel engine and therefore within wide margins, so that here, too, the adjustment work must be performed by the operator.
SUMMARY OF THE INVENTION
It is therefore the object of the invention to maintain the predeterminable angle of the operating equipment, in particular the scoop angle, constant within the majority of all occurring operating conditions in the course of lowering the lifting frame.
This object is attained on the one hand in that in the course of continued extension of the piston rod of the tilting cylinder, several measurements of the traveled distance of the piston rod are performed at predeterminable places, wherein the first measured value triggers a signal to the effect that the logical switching device activates a further magnetic valve which moves the tilting piston into a position in which a predeterminable reduced oil stream flows to the tilting cylinder, and that in the cour
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Bronner Gunter
Kolb Walter
Leidinger Gustav
Batson Victor
Melius Terry Lee
O&K Orenstein & Koppel AG
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