Patents
Literature
Eureka-AI is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
Eureka AI

5344results about "Fluid-pressure actuator components" patented technology

Integrated hydraulic station

The invention belongs to the technical field of compressed natural gas filling, and particularly relates to an integrated hydraulic station which realizes high integration of an oil tank, plunger pumps, motors, a valve block, a cooler, an instrument and a sensor. The reversing function of hydraulic oil is provided through cooperation of an electro-hydraulic reversing valve and a proximity switch on a hydraulic cylinder, the functions of circulating heating of the low-temperature hydraulic oil, discharging of the high-pressure hydraulic oil and avoiding the hydraulic oil channeling back betweenthe double pumps are realized through cooperation of an unloading valve, a one-way valve and the electro-hydraulic reversing valve in the valve block, the high-pressure difference automatic stop function and the high-pressure gas discharging function are provided, combustible gas leakage and expansion deformation of the oil tank which cannot be recovered caused by high-pressure gas channeling back are avoided, the functions of low oil level monitoring alarm, temperature monitoring alarm and low oil temperature automatic circulating heating before starting of the hydraulic oil tank are provided, a three-way ball valve is adopted to replace an oil return valve block in the aspect of cooling oil return of the hydraulic oil, thus the oil return control function is realize, and the cost and space of the hydraulic station are also reduced.
Owner:JEREH OIL & GAS ENG

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

Differential energy recovery device and method for seawater desalination system

The invention discloses a differential energy recovery device and a method for a seawater desalination system. The differential energy recovery device comprises two hydraulic cylinders connected in parallel. A piston divides each hydraulic cylinder into two cavities. The piston is fixedly connected with a piston rod. A low-pressure raw water inlet is connected with two left cavities through liquid inlet valves. The left cavities are connected with a high-pressure raw water outlet through liquid drain valves. Two right cavities are connected with reversing valves. The reversing valves are connected with a high-pressure concentrated water inlet and are connected with a low-pressure concentrated drain outlet. The method is that high-pressure concentrated water coming from a reverse osmosis device is enabled to enter the right cavities of the two hydraulic cylinders through the reversing valves, and low-pressure raw water in the left cavities is pushed and pressurized to enter the reverse osmosis device. Since the direct pressurization principle of the hydraulic cylinders is used for the special design, one-time energy conversion is adopted and the pressure of high-pressure seawater after pressure exchange is larger than the pressure of concentrated saline water, the invention has the advantages that the pressurizing pumps are not required for pressurization once more, the energy conversion efficiency is high, the operating cost is saved and the energy consumption of the reverse osmosis system is further reduced.
Owner:TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI

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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products