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3941 results about "Excavator" patented technology

Excavators (hydraulic) are heavy construction equipment consisting of a boom, dipper (or stick), bucket and cab on a rotating platform known as the "house". The house sits atop an undercarriage with tracks or wheels. They are a natural progression from the steam shovels and often mistakenly called power shovels. All movement and functions of a hydraulic excavator are accomplished through the use of hydraulic fluid, with hydraulic cylinders and hydraulic motors. Due to the linear actuation of hydraulic cylinders, their mode of operation is fundamentally different from cable-operated excavators which use winches and steel ropes to accomplish the movements.

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

Multiple simultaneous laser-reference control system for construction equipment

A number of laser beam stations emit vertically separated parallel planes and/or ray-planes of laser light that can be discriminated by their respective plane elevations, modulation of the laser light, time synchronizing, etc. Identifying the laser plane would also imply an identification of the source laser beam station, and thus a precise indication of the elevation at the point of optical intercept. Alternatively, a single laser beam station is used that can emit several different monochromatic color planes and/or ray-planes of laser light. Monochromatic laser diodes, for example, are used for point-light sources and rotating or on-end conical mirrors are used to convert the diode laser light to the required monochromatic color planes and/or ray-planes of laser light. Receivers, generally held on masts attached to motor grader, bulldozer, loader, and excavator machines are used to sense the vertical reference position of the monochromatic color planes and/or ray-planes of laser light, relative to the earth cutting blade of the machine. Fixed-color filters, color filter wheels, and/or linear array photodetectors are used to discriminate amongst the colors and to exactly sense the plane of intersection with the machine. The results of the sensing are either displayed to an equipment operator for manual adjustment of the blade to an automatic servo control system connected to hydraulically control the blade.
Owner:TRIMBLE NAVIGATION LTD

Heavy-duty demolition apparatus with replaceable tip and rotatable cross blade

A heavy-duty demolition shear for attachment to the boom structure and hydraulic system of an excavator, has a rigid lower jaw and an upper jaw and pivot interconnecting the jaws together. The shear is attachable to the boom structure of the excavator. The upper jaw has upper shear blades, while the lower jaw has at least one lower shear blade. The lower jaw also has a rigid guide blade lying along the lower shear blade and in spaced relation therewith. The outer ends of the shear blade and guide blade are co-extensively opposed to each other so that a tie plate secures the outer ends of the lower shear blade and the guide blade together. There is an open slot between the lower shear blade and the adjacent guide blade to receive the upper shear blade and upper jaw therein. The upper jaw has a cylinder attached to the hydraulic system of the excavator for closing and opening the upper jaw relative to the lower jaw. The lower jaw and the upper jaw shear a workpiece when the upper jaw is closed upon the lower jaw. A rotatable, indexable cross blade is mounted to the tie plate substantially transverse to the lower shear blade and to the guide blade. The cross blade is seated and mounted inside the tie plate at an angle between one degree and thirty degrees, preferably about ten degrees. Thus, the cutting edge leans inwardly toward the throat of the shear, while the lower portion extends outwardly to provide upper jaw clearance within the open slot. The upper jaw includes a replaceable tip.
Owner:GENESIS ATTACHMENTS

Flow rate control device in a hydraulic excavator

A flow rate control device in a hydraulic excavator, comprising a hydraulic pump which is driven rotatively by an engine, a hydraulic actuator which is driven by a hydraulic oil discharged from the hydraulic pump, a control valve which controls the supply of the hydraulic oil to the hydraulic actuator, an operating means which operates the control valve so as to change over the valve from one position to another, a relief valve disposed in a discharge oil path extending from the hydraulic pump to limit the maximum pressure in the discharge oil path, an operational condition detecting means for detecting an operational condition of the hydraulic actuator, a pump pressure detecting means for detecting the discharge pressure of the hydraulic oil discharged from the hydraulic pump, a flow rate adjusting means for adjusting the discharge flow rate of the hydraulic oil discharged from the hydraulic pump, and a control means to which are inputted detection signals from both the operational condition detecting means and the pump pressure detecting means. When a specific operational condition of the hydraulic actuator is detected and when the said discharge pressure is held at a predetermined relief cut-off pressure or higher for a predetermined period of time, the control means makes control so that the discharge flow rate of the hydraulic oil discharged from the hydraulic pump is decreased to a relief cut-off pressure by the flow rate adjusting means. According to this construction, the relief cut-off control can be made only where required for each of various works of different conditions which the hydraulic excavator performs, such as excavating work, crushing work and land readjusting work. That is, even when the discharge pressure is held at a predetermined relief cut-off pressure or higher for a predetermined period of time, the relief cut-off control is made if the hydraulic actuator is in the specific operational condition.
Owner:KOBELCO CONSTR MASCH CO LTD

Three-dimensional attitude display and remote automatic control system of excavator

The invention discloses a three-dimensional attitude display and remote automatic control system of an excavator. A pull line type displacement sensor is adopted to acquire a displacement signal of amoveable arm hydraulic cylinder, a bucket rod hydraulic cylinder and a scraper bucket hydraulic cylinder, and the displacement signal is sent to a computer through a data acquisition card; a car bodyrotation angle signal is acquired through an electronic compass, and the car body rotation angle signal is sent to the computer through an RS232 serial port; the computer is used for storing and processing data, so that a three-dimensional animated simulation attitude of the excavator is displayed in real time; an expected track of a scraper bucket tail end is planned; according to a practical displacement and car body rotation signal of a working device, a control algorithm is run by performing kinematic conversion on the practical displacement and car body rotation signal and comparing the practical displacement and car body rotation signal subjected to kinematic conversion with expected track data so as to correct the track; a CAN communication mode is adopted for realizing data communication between the computer and a special DSP controller of the excavator; operation state information is monitored in real time; operation track of tooth tips of X, Y and Z-axis scraper bucket and athree-dimensional displacement curve of the tooth tips of the scraper bucket are displayed in real time; and remote automatic control is realized through WEB service of a virtual instrument.
Owner:NANJING UNIV OF TECH +1

Hydraulic excavator flow rate control method and control loop

The invention discloses a hydraulic excavator flow rate control loop which comprises a hydraulic and electric control loop. The hydraulic excavator flow rate control loop is characterized by comprising two electromagnetic proportional valves and two or-gate type three-way shuttle valve, wherein the electric control ends of the proportional valves are respectively connected with the controller, the input end is connected with a pilot pressure pump of an excavator, the output end is connected with a input opening P1of one three-way shuttle valve, input openings P2 of the two three-way shuttle valves are respectively connected with a front negative feedback valve core and a back negative feedback valve of the excavator, and output openings A of the three-way shuttle valves are respectively connected with a front negative feedback regulator and a back negative feedback regulator. A method comprises the following steps of: receiving sensor signals by a controller; sending electromagnetic proportional valve electric control signals; opening proportional valve and shuttle valve paths; controlling the corresponding negative feedback regulators through the pressure of the proportional valves; and finally controlling the delivery capacity of the pump. The method realizes the limitation on the system delivery capacity through controlling the delivery capacity of the pump by using the electromagnetic proportional valves, so the flow rate maintains the normal state when a rotating or walking device works singly, and the damage to a motor caused by high flow rate is avoided.
Owner:SANY HEAVY MACHINERY
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