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2476 results about "Electro hydraulic" patented technology

2D hydraulic-power-assisted electro-hydraulic proportional reversing valve

The invention provides a 2D (2-dimensional) hydraulic-power-assisted electro-hydraulic proportional reversing valve, which comprises a valve body, a valve core, a valve sleeve, a linear electro-mechanical converter and a compressive-torsional coupling, wherein the valve core, the compressive-torsional coupling and the linear electro-mechanical converter are coaxially connected; an output shaft of the linear electro-mechanical converter is fixedly connected with an input end of the compressive-torsional coupling; an output end of the compressive-torsional coupling is fixedly connected with the right end of the valve core; a sensitive cavity is formed by the left end of the valve core, the valve sleeve and a left cover plate; a pair of axisymmetric high pressure holes and a pair of axisymmetric low pressure holes are respectively formed on the surfaces of shoulders of the valve core in the sensitive cavity; a pair of axisymmetric sensing channels are arranged on the inner surface of the valve sleeve outside the sensitive cavity; and one end of each receptive channel is communicated with the sensitive cavity, and the other ends of the receptive channels cover areas between adjacent high pressure holes and low pressure holes. The 2D hydraulic-power-assisted electro-hydraulic proportional reversing valve not only has the characteristics of high flow rate, high working pressure, and the like of an ordinary pilot-control type electro-hydraulic proportional valve, but also fulfils a proportional control function like a direct-actuated proportional valve under the circumstance of zero pressure (pressure loss).
Owner:ZHEJIANG UNIV OF TECH

Microcomputer-controlled electro-hydraulic servo rock tri-axial dynamic shear-seepage coupling multifunctional test method

A microcomputer-controlled electro-hydraulic servo rock tri-axial dynamic shear-seepage coupling multifunctional test method belongs to the technical fields of rock mechanics and engineering technology and is characterized in that a test apparatus is composed of a loading system, a sealing system, a multiphase fluid injection system, an acoustic emission monitoring system, a deformation monitoringsystem and a data collection system. The test method not only solves technical problems that a tri-axial pressure chamber cannot be used for performing large displacement shear-seepage coupling of rocks under high confining pressure and high seepage pressure, and also can achieve various extended functions on the basis of the technology. The apparatus can achieve servo control loading of force, displacement and strain rate in shear direction and injection seepage of a multiphase fluid during dynamic shear. In addition, the apparatus is equipped with a temperature control system for performingconstant temperature control to the tri-axial pressure chamber at 0-200 DEG C; therefore, a series of extended experiments of dynamic shear-seepage coupling features of rocks under effect of temperature can be carried out.
Owner:TAIYUAN UNIV OF TECH

Airplane anti-skid brake control system and method

InactiveCN102556340AAnti-skid brake control method is simple and easyEasy to controlBrake regulatorsApplication and release valvesWheel speed sensorControl system
The invention relates to an airplane anti-skid brake control system and an airplane anti-skid brake control method. In the airplane anti-skid brake control system, two airplane wheel speed sensors are respectively applied to a left airplane wheel and a right airplane wheel of the airplane and connected with the input end of an electronic anti-skid control box; an electro-hydraulic servo valve is connected with a brake valve, a brake device, the electro-hydraulic servo valve and the electronic anti-skid control box respectively; the input port of the electronic anti-skid control box is connected with the airplane wheel speed sensors; and the output port of the electronic anti-skid control box is connected with the electro-hydraulic servo valve. In the invention, the electronic anti-skid control box judges true and false of the received airplane speed signal by comparing the airplane speed signal to be judged with the speed of the airplane wheels at different time or comparing the speed signals of the two airplane wheels so as to perform anti-skid control according to the speed signals of the airplane wheels which are judged to be true; and the airplane wheel brake pressure is adjusted according to the received instruction through the electro-hydraulic servo valve, so safe and reliable brake of the airplane wheels is realized.
Owner:XIAN AVIATION BRAKE TECH

Crane device with multi-degree-of-freedom active wave compensation function and compensation method

The invention discloses a crane device and a compensation method with a multi-degree-of-freedom active wave compensation function in the field of marine ships. The lower part is a circular static platform fixed on the deck; The moving platform is fixedly connected to the crane. Six servo cylinders are connected between the circular static platform and the circular moving platform. Each of the six servo cylinders is connected to a corresponding electro-hydraulic servo valve. The electro-hydraulic servo valves are serially connected in series Connect the power amplifier and D/A module to the motion controller, and the attitude sensor is installed in the center of the circular static platform; the attitude sensor transmits the measured roll, pitch and heave values ​​of the ship caused by wind and waves to the motion control The motion controller first obtains the motion values ​​of the six servo cylinders, and then obtains the wave compensation value opposite to the motion value. The six electro-hydraulic servo valves output the corresponding flow and pressure according to the wave compensation value to control the corresponding six Servo cylinders telescopic and sway to compensate for roll, pitch and heave.
Owner:JIANGSU UNIV OF SCI & TECH

Large movable lateral uplifting composite lading slope physical model test apparatus

A large movable lateral uplifting composite lading slope physical model test apparatus comprises a test framework, a bottom uplifting mechanism, a rear portion loading mechanism and a water level elevating simulation mechanism; the bottom of the front portion of the test frame is hinged to the test site ground surface, the test frame is formed by mutually splicing a front panel at the front portion, at least two vertically-arranged guard boards and a frame baseboard at the bottom portion, and the spacing between adjacent guard boards is adjustable; the bottom uplifting mechanism is arranged below the test frame and is used for driving the rotation of the test frame around the hinge pint at the front portion; and the rear portion loading mechanism comprises a loading steel board, an electro-hydraulic servo loading machine and a counterforce wall, the counterforce wall is arranged behind the test frame, the rear end of the electro-hydraulic servo loading machine is hinged to the counterforce wall, the front end of the electro-hydraulic servo loading machine is connected with the loading steel board, and the rear portion loading mechanism is used for applying action force to a slope physical model in the test frame from the rear end of the test frame. The apparatus is suitable for large-size slope physical models, and can realize the establishment of three-dimensional models better satisfying geometric similarity conditions than real slopes.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)

Energy-saving shield segment assembling and positioning electro-hydraulic control system adopting load-sensitive technology

InactiveCN103032396APrecise control of assembly positioningImprove construction qualityUnderground chambersServomotorsControl signalSystem pressure
The invention discloses an energy-saving shield segment assembling and positioning electro-hydraulic control system adopting a load-sensitive technology. The system comprises a motor, a variable pump, a two-position three-way proportional reversing valve, a variable cylinder, an overflow valve, a pressure reducing valve, a pressure compensating valve, a one-way valve, a multi-way valve, a balancing valve, a hydraulic lock, a hydraulic motor, a hydraulic cylinder, a moment rotation speed sensor, a displacement sensor and a pressure sensor. The multi-way valve with the pressure compensating valve in a segment assembling system is used for controlling the rotation speed of the hydraulic motor for driving the segment assembling machine to rotate and the moving speed of each hydraulic cylinder. The pressure sensor is used for detecting the pressure of a main oil passage of the system and the working pressure of each executer in real time; and a computer control unit is used for determining a variable pump control signal according to a system pressure signal, so that the displacement of the variable pump is changed with the load change so as to achieve load sensitive control. According to the invention, energy waste caused by continuous oil supply at the highest working pressure of the traditional system is avoided, the throttling loss and overflow loss are greatly reduced, and an obvious energy saving effect is obtained.
Owner:ZHEJIANG UNIV

An electrohydraulic power steering system controlled based on vehicle speed and load signals

The invention discloses an electro-hydraulic power steering system for an engineering mechanical vehicle based on vehicle speed and load signal control. A steering hydraulic pump of the electro-hydraulic power steering system is connected with a rotary valve and is connected between an oil storage device and a direct current motor; the rotary valve is connected with a power-assisted steering oil cylinder; the direct current is connected with a steering control unit through a driving circuit; the steering assisted cylinder is connected with a steering gear plumbing arm; the other end of the steering gear plumbing arm is connected to a steering knuckle arm through a steering straight pull rod; the steering knuckle arm is connected with wheels; a wheel rotary angle sensor, a vehicle speed sensor, a steering shaft load sensor, a steering wheel rotary angle sensor and a torque sensor are respectively connected with a steering control unit; both the vehicle speed and the load are consideredin the whole control system; the steering control unit is controlled by closed loop feedback; the defects that a steering force is insufficient or over great caused by incomplete signal acquisition is prevented; the precision of steering control is improved; and the aim of saving energy is achieved.
Owner:JIANGSU UNIV

Oil sludge cleaning and processing system for oil tank

The invention discloses an oil sludge cleaning and processing system for an oil tank. The oil sludge cleaning and processing system comprises a cleaning system, an oil sludge processing system and an integrated control system, wherein the cleaning system comprises a cleaning robot, an electric hydraulic pump, a water pump, an inert gas storage tank and a screw pump; the cleaning robot comprises a machine body, a traveling unit, a cleaning unit, a robot cleaning control unit, a sensing and communication unit and a robot power supply unit; the oil sludge processing system comprises an oil sludge processing device, an oil sludge processing control system and an oil sludge processing power supply device; the oil sludge processing device comprises a stirring machine, an ultrasonic emulsion breaking device, a centrifuge and an ultrafiltration system, as well as an oil sludge storage pool, a sludge pool, a centrifugal liquid storage tank, a concentration tank and a filtrate pool; a funnel is arranged on the stirring machine; and the integrated control system comprises an integrated control computer and a communication circuit module. The oil sludge cleaning and processing system disclosed by the invention has the advantages of reasonable design and high degree of intelligentization, and can realize comprehensive cleaning of the oil tank, good safety, fast oil sludge processing speed and resource utilization of oil sludge, and further reduce environmental pollution and waste of resources.
Owner:周利坤

Large bidirectional dynamic/static direct-shearing machine for coarse-grained soil contact interface tests

The invention discloses a large bidirectional dynamic/static direct-shearing machine for coarse-grained soil contact interface tests. The machine comprises a measuring and controlling unit (1), a hydraulic servo unit (2), a loading unit (3) and a soil sample preparing unit (4). The loading unit (3) comprises a Z-direction vertical loading frame, an X-direction horizontal loading frame and a Y-direction horizontal loading frame, the three frames are perpendicular to each other, and the three frames all have independent loading ability. The hydraulic servo unit (2) comprises an X-direction horizontal loading actuator (311), a Y-direction horizontal loading actuator (312) and a Z-direction vertical loading actuator (31). The measuring and controlling unit (1) is in separate communication connections with three electro-hydraulic servo loading cylinders of the hydraulic servo unit (2). The large bidirectional dynamic/static direct-shearing machine is used in coarse-grained soil shearing performance tests, coarse-grained soil shearing performance tests on reinforced contact interface and coarse-grained soil shearing performance tests on concrete interface under the dynamic/static loading effects of simulation traffic loading.
Owner:CENT SOUTH UNIV

Hydraulic-mechanical transmission engineering machinery automatic shifting speed variator and control method

ActiveCN101216101AImprove economyTaking into account the powerGearing controlControl signalInput control
The invention relates to a mechanical automatic shift speed-changing device in hydraulic mechanical transmission engineering and a control method thereof. The device comprises an electro-hydraulic shift speed-changing unit, an electro-hydraulic engine, a microcomputer controller, an electro-hydraulic motor controller, a transmission case output rotational speed sensor, a shifting handle switch, a shifting mode selection switch, a brake pressure switch and an automatic direction switch. The electro-hydraulic motor controller is communicated with the microcomputer controller. The transmission case output rotational speed sensor, a torque converter turbine speed sensor, a shifting handle, the shifting mode selection switch, the brake pressure switch and the automatic direction switch serve to input signals to the input port of the microcomputer controller. The microcomputer controller serves to input control signals to a transmission case control module by the output port thereof. Based on the combination of two shift methods, the inventive device has the advantages of good economical efficiency, power efficiency and practicability, low energy consumption, automatic shift with high work efficiency, less working time, reduced labor intensity of the driver, and suitability for various working conditions.
Owner:TIANJIN ENG MACHINERY INST

Electro-hydraulic composite braking system with electric braking assistant force and brake-by-wire function

The invention discloses an electro-hydraulic composite braking system with an electric braking assistant force and a brake-by-wire function. The electro-hydraulic composite braking system provided by the invention has various working modes In the case of an electric braking assistant force mode, a brake fluid is input into a master cylinder from a man-power cylinder by a brake pedal, and meanwhile, an electronic control unit controls the output torque of a motor to apply an assistant force, so as to output brake pressure to a wheel cylinder. In the case of a regenerative braking mode, the electronic control unit controls the on/off of an electromagnetic valve, the brake fluid is input into the simulation cavity of a pedal travel simulator from the man-power cylinder by the brake pedal so as to generate pressure and provide a brake pedal feeling; if automobile deceleration requirement can not be met by the regenerative braking, the electronic control unit controls the output torque of the motor so as to allow the master cylinder to output brake pressure into the wheel cylinder to assist friction brake. In case of an active braking mode, the electronic control unit controls the output torque of the motor so as to allow the master cylinder to output brake pressure to the wheel cylinder. The electro-hydraulic composite braking system provided by the invention has the advantages of integration of advantages of wire control and non-wire control working modes, small pressure fluctuation, and high pressure regulation precision.
Owner:南京经纬达汽车科技有限公司

Electro-hydraulic hybrid driving mine lifting device and control method thereof

The invention provides an electro-hydraulic hybrid driving mine lifting device and a control method thereof. A lifting motor is connected with a first hydraulic pump/motor through a clutch, the input end of the lifting motor is connected with a primary winding of a step-down transformer, the primary winding of the step-down transformer is connected with the output end of a cascade type high voltage frequency converter, a secondary winding of the step-down transformer is connected with the input end of a low voltage frequency converter, and an independent feeding unit is formed by connecting a boosting transformer and a high voltage alternating current power grid. The control method includes: part of energy is stored through an energy accumulator and fed to save energy during uplink, downlink and brake of a lifting machine and a winch. The electro-hydraulic hybrid driving mine lifting device and the control method of the electro-hydraulic hybrid driving mine lifting device improve braking and decelerating performance of the motor and shorten braking time of the motor. Compared with an electro-hydraulic hybrid driving mine lifting device adopting a super capacitor and a flywheel battery, the electro-hydraulic hybrid driving mine lifting device adopts the hydraulic energy accumulator to store energy and is mature in technology, reliable in operation and long in service life.
Owner:TAIYUAN UNIV OF TECH
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