228 results about "Hydraulic transformer" patented technology

A control system for a work machine having a hydraulic energy source, a hydraulic accumulator, a digital hydraulic system having a digital hydraulic transformer, a hydraulic actuator and a movable element. The hydraulic accumulator being fluidically couplable with the hydraulic energy source. The digital hydraulic system including a digital hydraulic transformer fluidically couplable with the hydraulic accumulator. The hydraulic actuator being fluidically couplable with the digital hydraulic transformer. The movable element being movable by the hydraulic actuator. The control system including means to estimate at least one of potential energy and kinetic energy in the movable element; means to measure a fill level of hydraulic fluid in the hydraulic accumulator; and means to vary the amount of hydraulic energy added to the hydraulic accumulator by the hydraulic energy source responsive to the potential energy, the kinetic energy and/or the fill level of the hydraulic accumulator.

An energy-saving control system for hydraulic elevator features use of a hydraulic pressure changer composed of variable or quantitative pump and motor. Said pressure changer can get energy from constant-pressure network and provide it to load without pressure loss, or reverse the energy from load. Its avdantages are high dynamic response speed and pressure amplifying effect.

The invention discloses an energy-saving shield machine hydraulic pressure control system, adopting hydraulic transformer, which comprises a hydraulic transformer, a motor, a constant pressure variable displacement pump, a two-position three-way reversing valve, a proportional overflow valve, a safety valve, an accumulator, a hydraulic cylinder, a three-position four-way reversing valve, a hydraulic motor, a reducing valve and a two-position two-way reversing valve; wherein, the shield machine driving, the cutter head drive and the spiral transportation system are integrated in a loop; the constant pressure network comprising the constant pressure variable displacement pump and the accumulator provides the system with power energy; the propulsion system adopts group control and comprises a plurality of groups; the discharge capacity of variable displacement pump/motor inside the hydraulic transformer is adjusted in real-time to control the speed and the propulsive force of the propulsion hydraulic cylinder and the rotational speed and the output torque of the hydraulic motor. The energy-saving shield machine hydraulic pressure control system has the advantages of adopting hydraulic transformer and other energy-saving elements and control methods, lossless transfer of energy, guarding against energy loss in the throttling speed regulation system, and good performance of energy-saving.

A hydraulic transformer is disclosed. The hydraulic transformer may have a housing, and a first pumping mechanism disposed within the housing and rotated in a first direction by fluid pressure. The hydraulic transformer may also have a second pumping mechanism disposed within the housing and rotated by the first pumping mechanism in the first direction to increase the fluid pressure. The hydraulic transformer may further have a common shaft connecting the first and second reversible pumping mechanisms. One of the first and second pumping mechanisms may also be rotated in a second direction opposite the first by fluid pressure. The other of the first and second pumping mechanisms may also be rotated by the one of the first and second pumping mechanisms in the second direction to increase the fluid pressure.

The invention relates to a hydraulic system of a hybrid power full-hydraulic excavator based on a CPR network, which belongs to the hydraulic system of excavators and solves the problems of low energy recovery and poor energy saving effect of the traditional fuel-electricity hybrid power system. A constant pressure variable output pump and a fixed displacement pump are connected with an output shaft of an engine and form a constant pressure fuel source together with a high pressure accumulator and a safety valve, and a central controller controls the engine to intermittently work in the best fuel saving region. Three double-way variable hydraulic pumps/motors and a hydraulic transformer are connected to the constant pressure fuel source and directly drive a working mechanism, and the central controller respectively controls the steering direction and the output volume of each hydraulic pump/motor and the transformer ratio of the hydraulic transformer through control assemblies. The system is suitable for the excavator; and only by retrofitting and transforming the traditional excavator, the fuel saving property of vehicles can be obviously increased, the emission of tail gases is reduced, the power performance of the vehicles is enhanced, and the service life of the engine and a brake device is prolonged.

The invention discloses an energy recovery device in a shield duct piece assembling driving system, comprising an electric motor, a pump, a one-way valve, a hydraulic motor/pump, a relief valve, an energy accumulator, a three position four-way directional control valve, a hydraulic pressure transformer and a hydraulic cylinder. The system adopts the motor/pump, the energy accumulator and the hydraulic pressure transformer as energy conversion and recovery elements, converts part of the mechanical energy in the circumferential rotation and vertical lifting movement shield duct piece assembling machine into hydraulic energy, and stores the hydraulic energy to be used for assembly. The actuator element motor/pump of the hydraulic system drives the assembling machine to rotate when working at the state of motor, and feeds the load energy back to the energy accumulator when working at the state of pump. By switching the working states of the hydraulic transformer, the lifting of a lifting hydraulic cylinder and the recovery of gravity loading energy are realized. As no throttling element is arranged in the system, the energy transmission efficiency is high, energy loss in a throttle governing system is avoided, and the system has obvious energy conservation effect.

The invention relates to a hydraulic transformer, in particular to an electrically controlled clino-axis piston hydraulic transformer. The hydraulic transformer of the invention aims at solving the problems that the current hydraulic transformer is mainly controlled by hands and is inconvenient for operation and difficult for ensuring precision. The front end of a transitional plate (4) of the invention is arranged in the lower part of a shell body (9) and connected with a port plate (2); the rear end of the transitional plate (4) is connected with a main shaft (6) of the port plate; a rear end cover (5) is arranged on the main shaft (6) of the port plate and fixedly connected with the shell body (9); the front end surface of the rear end cover (5) mutually contacts the rear end surface of the transitional plate (4); a driven gear (11) on the transitional plate (4) is meshed with a driving gear (12) on a gear shaft (3); the gear shaft (3) is connected with the outputting end of an servo motor (7) by a coupler (8). The servo motor is adopted in the invention to control the rotating angle of the driven gear by the gear shaft; servo control is introduced, thus not only having convenient operation, but also being capable of realizing precise control and improving the controlling performance of a system.

An auxiliary pump system for a hybrid powertrain includes a hydraulic accumulator, a hydraulic transformer, a plurality of control devices, a sump, and a plurality of fluid flow paths. The accumulator is charged by a high flow, high pressure hydraulic fluid by opening a first of the control devices and closing a second of the control devices. The accumulator is discharged by closing the first of the control devices and opening the second of the control devices. A high pressure, low flow hydraulic fluid is communicated from the accumulator to the hydraulic transformer. The hydraulic transformer converts the high pressure, low flow hydraulic fluid into a high flow, low pressure hydraulic fluid that is employed by systems within the hybrid powertrain.

The invention discloses a hydraulic hybrid power excavator hydraulic system with a switching control function, and relates to an excavator hydraulic system, aiming at realizing the excavator hydraulic system and reducing the manufacturing cost. An A port of a second hydraulic transformer is communicated with a rodless cavity oil port of a bucket hydraulic cylinder; a rod cavity oil port of the bucket hydraulic cylinder is communicated with a B port of the second hydraulic transformer; the two oil ports of the bucket hydraulic cylinder are connected in parallel with a first travel constant displacement motor; a loop formed between the bucket hydraulic cylinder and the first travel constant displacement motor is provided with a first switching valve bank; an A port of a third hydraulic transformer is communicated with the rodless cavity oil port of the bucket hydraulic cylinder; the rod cavity oil port of the bucket hydraulic cylinder is communicated with a B port of the third hydraulic transformer; the two oil ports of the bucket hydraulic cylinder are connected in parallel with a second travel constant displacement motor; and a loop formed between the bucket hydraulic cylinder and the second travel constant displacement motor is provided with a second switching valve bank. The switching control over the travel constant displacement motors is realized by using the hydraulic transformers for controlling the bucket and a bucket rod through two valve banks, so that the reconstruction difficulty and cost are reduced.

As such, the present invention relates to a hydraulic system (10) for a working machine (101). The hydraulic system (10) comprises a hydraulic actuator (12) and a first hydraulic machine (14) for supplying fluid to the hydraulic actuator (12). The hydraulic system (10) further comprises a hydraulic transformer (28) for supplying fluid to the hydraulic actuator (12) in parallel with the first hydraulic machine (14), and an accumulator (38) for fluid. The hydraulic transformer (28) comprises a first port (30) and a second port (32) and the transformer (38) is adapted to transform a first pressure and a first flow at the first port (30) to a second pressure and a second flow at the second port (32). The second port (32) of the hydraulic transformer (28) is in fluid communication with the hydraulic actuator (28) and the first port is in communication with the accumulator (38).

The invention relates to an apparatus for executing activities assisted by equipment driven by means of rotating or linear hydromotors. The hydromotors may be loaded and/or moved in two directions. The hydromotors are coupled via a connecting line and a hydraulic transformer with a high-pressure line. The hydraulic transformer is provided with adjusting means for controlling the hydromotor and control means are provided for restricting the fluid flow in the hydraulic transformer.

The invention discloses a movable arm energy-saving control system which comprises a first oil tank, a variable pump, a motor, an overflow valve, a one-way valve, a three-position three-way electromagnetic directional valve, a movable arm oil cylinder, a first pressure sensor, a first hydraulic one-way valve, a two-position three-way electromagnetic directional valve, a first two-position two-way electromagnetic directional valve, a second oil tank, a second two-position two-way electromagnetic directional valve, a second pressure sensor, a constant displacement motor, a variable displacement motor, an optical-electricity encoder, a second hydraulic control one-way valve, an energy storage device, a third oil tank, a third two-position two-way electromagnetic directional valve and a computer. The movable arm energy-saving control system adopts a hydraulic energy recovery mode that a hydraulic transformer composed of the constant displacement motor and the variable displacement motor is used as an energy converting component, and the hydraulic energy storage device is used as an energy storage component, has the advantages of being safe, low in cost, high in efficiency and the like, has great development potentiality in engineering machinery, and especially has important development potentiality in saving energy of hydraulic excavators.

The invention publicizes a kind of hydraulic transformer for extending voltage-regulating range. The main shaft and center shaft intersects into obliquid shaft structure. One end of the center shaft is connected with the main-shaft, the other end is fixed in the center hole of vessel. The shaft plug and the connecting rod are connected by ball-hinge, the other end of the connectnig rid connected with the main shaft by ball hinge, and the other end of shaft-plug is laid in the shaft-plug cavity of vessel, distributing flow disc is fixed between the vessel and the back-end lid by controlling the rotating angle of the distributing flow disc and controlling the flow quantity of three oil exits of the distributing flow disc, it controls the pressure proportion of input and output. Using the special distributnig flow disc, and back-end lid structure, it resolves the damage of oil liquid throttle, enlarges the proportion range of the pressure transforming, to a greast extent, it embodies the pressure-transforming function, recycling load function, energy-saving function. In order to measure the rotating angle of the distributing flow disc, there is a angle transmission shaft.

A control system for a hydraulic system including an accumulator and a hydraulic transformer coordinates flow sharing within the hydraulic system. The hydraulic transformer includes first and second variable displacement pump/motor units mounted on a rotatable shaft. The rotatable shaft has an end adapted for connection to a first external load. The first variable displacement pump/motor unit includes a first side that fluidly connects to a pump and a second side that fluidly connects to a tank. The second variable displacement pump/motor unit includes a first side that fluidly connects to the accumulator and a second side that fluidly connects with the tank. A second external load may be hydraulically connected to the hydraulic system. Energy may be transferred to/from the pump, the accumulator, the first external load, and/or the second external load, as directed by the control system.

A method of controlling an hydraulic activation unit includes the steps of using a characteristic diagram of a first hydraulic transformer as an input variable in the control unit; using a characteristic diagram of a second hydraulic transformer as an input variable in the control unit; and activating the hydraulic actuator responsive to the input variables. The hydraulic activation unit includes the hydraulic power unit, such as a hydraulic actuator or a hydraulic motor, for producing a force. The first hydraulic transformer is operably connected to a first side of the actuator for supplying a pressure. The second hydraulic transformer is operably connected to a second side of the actuator for supplying a pressure. The control unit for assessing the first and second hydraulic transformer operably activates the hydraulic actuator.

Natural water evaporation is a buffered process with huge energy absorption from solar & its derivative wind energy. When large surface shallow pool filled with aqueous solution is exposed under sky, the most portion of natural energy will be spent for pulling water out of water molecules cluster, yet there is still some energy for splitting water from solutes, then the concentration increases, in turn, despite the main former energy is sacrificed, but the stronger solution can redeem most the latter energy during a process of Pressure Retarded Osmosis (PRO), via membranes separating solution & available water in situ, then the redeemed energy serves as utilizable power output, with the assistance of key units or components: the osmotic to hydraulic pressure transformer, the hydraulic oil current rectification fluidic circuit & a hydraulic motor. With minor adaptation, same mechanism can also be embodied as: mobile osmosis engine, osmosis vehicle battery, yard synergy-osmosis power system, Grid electricity and miscellaneous renewable energy to osmosis energy storage, even desert to oasis remediation with seawater intake solar-via-osmosis powerplant & parasitic freshwater factory.

The invention relates to an electric hydraulic servo mechanism applied to a hydraulic pressure transformer, which is formed by connecting a three-position four-way solenoid valve with a double-action rack oscillation hydraulic cylinder through an oil path. The inlet of the solenoid valve is connected with a hydraulic oil source and an oil tank respectively by oil paths. In the electric hydraulic servo mechanism, the solenoid valve controls a rack in the hydraulic cylinder to do reciprocating motion, so as to control the rotation of a gear by meshing, and a gear shaft extended out of the double-action rack oscillation hydraulic cylinder is combined with a flow distribution plate or an inclined plate so as to realize the purpose of controlling the control rotating angles of the hydraulic pressure transformer. In the double-action rack oscillation hydraulic cylinder, the rotary inertia is low, the dynamic response is rapid, and the control performance is good. For the electric hydraulic servo mechanism, the function of flexible control and regulation can be realized, the structure is compact and the volume is small.

The invention provides a hydraulic excavator movable arm loop based on a hydraulic transformer and a control method thereof, and belongs to the technical field of hydraulic excavators. The hydraulic excavator movable arm loop based on the hydraulic transformer is characterized in that a port A of the hydraulic transformer (6) is connected with a high voltage network (4), a first pilot operated check valve (10) is connected between a port B of the hydraulic transformer (6) and a first movable arm hydraulic cylinder (11), another first pilot operated check valve (10) is connected between the port B of the hydraulic transformer (6) and a second movable arm hydraulic cylinder (12), a second pilot operated check valve (13) is connected between the port A of the hydraulic transformer (6) and the first movable arm hydraulic cylinder (11), a third magnetic exchange valve (15) is connected between the port A of the hydraulic transformer (6) and the second movable arm hydraulic cylinder (12), and a first safety valve (7) is connected between the port B of the hydraulic transformer (6) and the first pilot operated check valve (10). A hydraulic transformer control assembly (5) is controlled by a controller (19) according to an operating handle control signal (S), a hydraulic transformer thrust plate intersection angle signal and a hydraulic transformer rotating speed signal to enable the movable arm to stably operate at an expected speed. The hydraulic excavator movable arm loop based on the hydraulic transformer and the control method have the advantages of being easy to operate, high in control precision, work efficiency and energy recovery efficiency, low in cost and free of throttling loss.

The invention relates to a test experiment system, and particularly relates to a test experiment system for the revolving speed and the pressure property of a hydraulic transformer, the system is used for solving the problem that the revolving speed and pressure property of the hydraulic transformer can not be measured yet by the test experiment system at present. The test experiment system is characterized in that the constant pressure output end of a hydraulic constant pressure network assembly is communicated with the high-pressure end A port of the hydraulic transformer; a control assembly is connected with the hydraulic transformer; the load output end of an artificial load assembly is communicated with the load end B port of the hydraulic transformer; a high-pressure end A port pressure monitoring assembly is connected with the high-pressure end A port of the hydraulic transformer; a load end B port pressure monitoring assembly is connected with the load end B port of the hydraulic transformer; an A port flow sensor is connected with the high-pressure end A port of the hydraulic transformer; and a B port flow sensor is connected with the load end B port of the hydraulic transformer. The test experiment system disclosed by the invention is used for the property test of the hydraulic transformer.

The invention discloses a digital type hydraulic transformer. A main body of the transformer comprises a flow shunting/collecting system comprising n gear pump/motor units and two control valve groups; each control valve group comprises n two-position three-way electromagnetic switch valves; the n gear pump/motor units are fixed side by side through manifold screws and fastening nuts, the displacements of the n gear pump/motor units are sequentially configured as per the law of indexes of 2, and n is an integer larger than 2; the state of the n two-position three-way electromagnetic switch valves of the inlet control valve group corresponds to an n-bit binary number Ni; the state of the n two-position three-way electromagnetic switch valves of the outlet control valve group corresponds to an n-bit binary number No; and pressure and flow conversion between an external load oil port and an external oil source port is realized through binary digital control on the working state of the inlet control valve group and the working state of the outlet control valve group. The transformer is compact in structure, the transformer ratio is convenient and labor-saving to adjust and is large in range, external leakage is avoided, and the energy loss is low.

The invention discloses a novel secondary regulation system based on electrical control. The novel secondary regulation system comprises a hydraulic energy accumulator, an electric quantity storage unit, a driving motor, a first motor/generator, a second motor/generator, a first motor controller, a second motor controller, an inverter, a first variable pump/motor, a second variable pump/motor, a reversing valve, a shuttle valve, a safety valve, a controller and the like. Conventional hydraulic transformers or proportional reversing valves are replaced by the variable pumps/motors and the motors/generators for matching the pressures and flows of a constant pressure source and a load in the secondary regulation system, the pressures of the hydraulic energy accumulator and the load are matched by regulating the displacement of the variable pumps/motors, and the speed of an actuator is controlled by regulating the rotation speed of the motors/generators; in addition, through the multi-quadrant operation of the motors/generators and the variable pumps/motors, the occasion where the pressure of the load is driven to be higher than that of the hydraulic energy accumulator is achieved, and the defects that a conventional secondary regulation system is difficult to adapt to the actuator which is linearly driven and the pressure of the load is difficult to drive to be higher than that of the hydraulic energy accumulator are overcome.

The invention relates to a hydraulic transformer with axial flow distribution, belonging to the hydraulic technology field and solving the problems that the existing hydraulic transformer has large volume and complex structure. The hydraulic transformer comprises a cylinder body, a flow distribution plate, a pump shell, a flow distribution shell, a main flow distribution shaft, a bearing, a pin, an end cover and a control mechanism, the flow distribution plate and the main flow distribution shaft are connected by a pin, an electric hydraulic servo mechanism is used for controlling the rotation of the main flow distribution shaft, so as to control the rotating angle of the flow distribution plate and realize change of transformer ratio; a fan-shaped notch is arranged on the flow distribution plate, an oil path of the notch is directly communicated inside the pump shell, and a low-pressure return opening of the same pump is realized to be communicated to an oil tank, so as to realize direct connection of the fan-shaped notch and the oil tank; a waist-shaped groove with the same shape as the flow distribution plate and at the same position as the flow distribution plate is designed on the main flow distribution shaft, so as to realize communication of the oil path. The hydraulic transformer with axial flow distribution is used as the hydraulic pressure transformer.