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6712results about "Soil-shifting machines/dredgers" patented technology

Excavation teaching apparatus for construction machine

The invention is intended to provide an excavation teaching device for a construction machine which can realize easy confirmation of a proper target excavation surface and increase the working efficiency during excavation even in work of forming the face of slope in complicated three-dimensional landforms.
A display unit (46) displays, as an image in a first screen area (46a), a plurality of small plane surfaces G constituting a three-dimensional target landform and illustrations of a body S of the construction machine and a bucket B as an excavating tool at a fore end of an operating mechanism. Also, the display unit discriminatively displays in the first screen area, as a target excavation surface TG defined by a small plane surface along which excavation is feasible, one of the plurality of small plane surfaces constituting the three-dimensional target landform, which satisfies that the direction normal to the one small plane surface is parallel within a range of allowable error to a plane in which the operating mechanism operates. A panel computer (45) displays, on the display unit (46), a line resulting from projecting a line normal to the target excavation surface, selected from among the plurality of, small plane surfaces constituting the three-dimensional target landform, and the direction in which the operating mechanism of the construction machine operates with current orientation thereof, as well as relative positional relationships among the body of the construction machine, the position of the operating mechanism and the target landform.
Owner:NIHON KENKI CO LTD

Method and device for attenuating the motion of hydraulic cylinders of mobile work machinery

The present invention relates to a method for attenuating the motion of hydraulic cylinders of mobile work machinery, in particular of hydraulic excavators, in which prior to the hydraulic cylinder reaching one of the limits of travel, its motion speed is reduced, and the hydraulic cylinder is moved to the respective limit of travel at reduced speed; wherein for the purpose of reducing the speed, the inflow to, and/or the outflow from, the hydraulic cylinder are/is throttled by a flow control device. According to the invention, the method is characterized by, prior to the respective limit of travel being reached, the motion speed of the hydraulic cylinder is registered, and the point in time when throttling commences is changed depending on the registered motion speed. Furthermore, the present invention relates to a device for attenuating the motion of hydraulic cylinders of mobile work machinery, in particular of hydraulic excavators, a position registering device for registering a preliminary limit position of the hydraulic cylinder, a control device for throttling the inflow and/or outflow of the hydraulic cylinder, and a control device for controlling the flow control device when the preliminary limit position is reached. According the invention, the device has a speed registering device for registering the motion speed of the hydraulic cylinder when the preliminary limit position is reached, and the control device has a delay device for delaying driving the flow control device, depending on the recorded motion speed.
Owner:LIEBHERR FRANCE
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