Motors: expansible chamber type – With motive fluid valve – Electrically operated
Patent
1998-04-02
2000-06-06
Nguyen, Hoang
Motors: expansible chamber type
With motive fluid valve
Electrically operated
91461, F15B 13044
Patent
active
060705167
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a control for the flap of a construction machine, in particular an excavator.
Until recently, only foot pedals were used to actuate the flap, which as a rule is operated with the aid of one or several hydraulic cylinders. One disadvantage that must be mentioned in this connection is that a sensible operation of the hydraulic cylinders and thus also the flap is not always ensured owing to the manual operation of the foot pedal, so that the flap many times comes to rest undamped in its end position. Thus, it lies within the range of experience of the construction machinery operator how long the pedal is activated to avoid undesirable impacts in the end positions of the flap.
SUMMARY OF THE INVENTION
It is the object of the subject-matter of the invention to conceive a control for the scoop, flap of a construction machine, in particular an excavator, through which a simple to operate control diagram is achieved on the one hand and, on the other hand, damages in the region of the hydraulic and/or the flap are avoided with certainty when moving it into the respective stop position.
For the control of the scoop, flap of a construction machine, in particular an excavator, this goal is reached with at least one distributing regulator that operates jointly with at least one hydraulic cylinder connected to the flap and which can be admitted with a hydraulic control pressure via at least one valve that can be electrically operated by at least one control device in that for the actuation of an operating element, the control device acting electrically therewith, the valve and via it the distributing regulator and the hydraulic cylinder are actuated by means of a predeterminably timed current ramp.
Advantageous modifications of the subject-matter of the invention follow from the dependent claims.
Thus, the function of the foot pedal is replaced by a semi-intelligent or intelligent control. At least one push-button switch is provided in the region of the driver's cab, preferably in the region of at least one hand lever provided there, which is electrically connected to a microprocessor (control device). Once the push-button switch is activated, the microprocessor releases a predeterminable, time-dependent current ramp, which electrically acts upon the magnet of at least one relief valve and which subsequently acts hydraulically upon the distributing regulator and thus also the flap cylinder. Since the flap is to be moved in two directions, it is possible to use either two relief valves or a relief valve together with a shuttle valve. This must be reconciled with the respective use. The foot switch can be retained to permit an in-between cleaning of the scoop through an abrupt opening and closing of the flap. This is done in particular when handling materials with a tendency to stick.
If necessary, a push button can be provided at each end position, so that the control detects the end position and a damped operating state can be initiated. All parameters such as time, distance, end position damping or the like can be programmed into the control to bring about a non-problematic actuation of the flap in this way and to avoid unnecessary damages, in particular when moving the scoop flap into the respective end region.
BRIEF DESCRIPTION OF THE DRAWING
The subject-matter of the invention is illustrated with an embodiment in the drawing and is described as follows. In which:
FIG. 1 to 3 illustrate various controls embodiments for actuating the flap of a construction machine according to the invention.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows as a basic diagram the control according to the invention for scoop flap 1 in a construction machine not shown in further detail. In a preferred embodiment the construction machine would be an excavator. The flap 1 can pivot flexibly around the articulated point 2 of flap 3, wherein the actuation occurs with the aid of a hydraulic cylinder 4 that is only indicated in the diagram and which is attached in the rear region
REFERENCES:
patent: 3487958 (1970-01-01), Shook et al.
patent: 3892079 (1975-07-01), Hirano et al.
patent: 5220862 (1993-06-01), Schexnayder
patent: 5287699 (1994-02-01), Takamura et al.
patent: 5490384 (1996-02-01), Lunzman
patent: 5784944 (1998-07-01), Tozawa et al.
Esch Uwe
Siegmund Reinhard
Nguyen Hoang
O & K Mining GmbH
Spencer George
Weierstall Eric J.
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