Blade control device for work machinery
a control device and work machinery technology, applied in mechanical machines/dredgers, soil shifting machines/dredgers, construction, etc., can solve the problems of excessive blade load, inability to control the grading control appropriate for an actual digging condition, and selection of control, etc., to achieve control the raising and lowering operation of the blade.
Pending Publication Date: 2021-10-21
KOBE STEEL LTD +1
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AI Technical Summary
Benefits of technology
The technical effect of this patent is to provide a blade control device for a work machine that can choose the right control for the actual digging conditions.
Problems solved by technology
The blade control system of Patent Literature 1, however, has a problem that control selected from the digging control and the grading control cannot be control appropriate for an actual digging condition.
In a case, for example, where the distance between the design surface and the blade edge goes below the second distance, even if a blade load is large, the grading control, i.e., the control for maintaining the distance between the blade edge and the design surface at a target distance, is conducted without fail, so that the blade load might be excessively large depending on a state (e.g. hardness of sediments, a kind of sediments, etc.) of the ground to be dug.
This might cause a work machine to be stuck.
Method used
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[0016]A preferred embodiment of the present invention will be described with reference to the drawings.
Overall Structure of Work Machine
[0017]FIG. 1 is a side view showing a hydraulic excavator 1 as an example of a work machine in which a blade control device according to an embodiment of the present invention is provided. The hydraulic excavator 1 includes a travelling device 2 (lower travelling body) capable of travelling on the ground G, a vehicle body 3 (upper slewing body) mounted on the travelling device 2, a work device mounted on the vehicle body 3, and a blade 4 (dozer) mounted on the travelling device 2 or the vehicle body 3. The travelling device 2 and the vehicle body 3 constitute a machine body of the work machine. The vehicle body 3 has a slewing frame, an engine, a driver's room, and the like.
[0018]The work device mounted on the vehicle body 3 includes a boom 5, an arm6, and a bucket 7. The boom 5 has a base end portion supported at a front end of the slewing frame so...
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A blade operation control part of a blade control device controls operation of a blade such that when a blade load is equal to or less than a first load threshold value and a position deviation is equal to or greater than a position threshold value, the blade is lowered to make the position deviation approach zero. The blade operation control part controls operation of the blade such that the blade is raised regardless of the position deviation when the blade load is equal to or greater than a second load threshold value.
Description
TECHNICAL FIELD[0001]The present invention relates to a blade control device provided in a work machine including a blade.BACKGROUND ART[0002]Conventionally, a work machine including a blade for use in digging of the ground, grading, transport of sediments, and the like has been used widely. In such a work machine, while conducting travelling manipulation, an operator conducts manipulation of raising and lowering a blade to adjust a blade position (a height of a blade edge) and to conduct digging of the ground, grading, or the like.[0003]Patent Literature 1 discloses a blade control system which automatically controls the blade position. The blade control system recited in Patent Literature 1 executes digging control in a case where a distance determination part determines that a distance between a design surface and a blade edge exceeds a first distance, executes grading control in a case where the distance determination part determines that the distance between the design surface ...
Claims
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IPC IPC(8): E02F3/84E02F9/26
CPCE02F3/844E02F3/964E02F9/262E02F3/7618E02F9/265E02F3/7609
Inventor SUGANO, NAOKIMAEKAWA, SATOSHIUEMURA, SHOHEINODA, DAISUKEKAMIMURA, YUSUKE
Owner KOBE STEEL LTD