1079results about "Accumulator installations" patented technology

There is described a device for adjusting a seat position of a bicycle seat. The device allows a rider of a bicycle to adjust the tilt of their bicycle seat while the bicycle is in motion, without the rider having to first dismount. In some embodiments, the rider may also adjust the height of their bicycle seat at substantially the same time as the seat's tilt is adjusted, again without the rider having to first dismount. There are described a motorized embodiment in which one or more motors are used to drive a tilt actuator and a linear actuator, and a mechanized embodiment in which a source of pressurized air may be used to drive the linear actuator which in turn drives the tilt actuator.

A hydraulic circuit is disclosed which includes one or more i) linear; or ii) rotary hydraulic actuator, wherein total number of cylinder chambers is N, M pressure rails, a valve arrangement, including M hydraulic rail ports each coupled to a pressure rail, N hydraulic chamber ports each coupled to a chamber of one or more actuators, N proportional valves each corresponding to one of the N hydraulic chamber ports, X sets of on-off valves and check valves coupling two or more hydraulic rail ports to each of supply sides of each of the N proportional valves, and Y sets of on-off valves and check valves coupling two or more hydraulic rail ports to each of return sides of each of the N proportional valves, and a controller configured to in real-time operate the N proportional valves and the associated on-off valves to achieve one or more desired functional parameters.

The invention belongs to the related technical field of hydraulic drive, and discloses an unmanned tractor hydraulic drive system which comprises an engine, a transfer case, a load-sensitive pump 15, a load-sensitive proportional multi-way valve 16, a straight hydraulic motor set 17, a steering metering pump 13, a priority valve 12, a speed regulating valve set 8, a three-position four-way electromagnetic reversing valve set 9, a hydraulic control one-way valve set 10 and a steering hydraulic motor set 11. Hydraulic drive is adopted, power is transmitted through an oil way, a transmission system is simple, stepless speed change can be achieved, speed regulation is convenient, and the tractor can be driven by controlling the opening degree and direction of a valve of a hydraulic element through electric signals; through the arrangement of the load-sensitive proportional multi-way valve and the load-sensitive pump, the problem that the driving capacity is lost due to uneven loads when motors are connected in parallel can be effectively solved, wheels of the tractor can keep rotating synchronously under different load conditions, and the stability and the running performance of the tractor under complex ground conditions are ensured.

A method for filling a hydraulic circuit of an electro-hydrostatic system includes connecting first and third shut-off valves to a discharge valve, and connecting a second shut-off valve to a filling valve, while the second and third shut-off valves are closed, opening the filling valve, the discharge valve and the first shut-off valve and operating a vacuum generator, once a vacuum has been established in the hydraulic circuit, opening the second shut-off valve in order to fill the hydraulic circuit with pressurized hydraulic fluid while the vacuum generator is still in operation, once the hydraulic circuit has been filled with fluid, closing the first shut-off valve and then opening the third shut-off valve in order to bypass the vacuum generator and circulate the fluid through the electro-hydrostatic system until the fluid contained in the hydraulic circuit reaches a predetermined pressure, and closing the discharge valve and the filling valve.

The invention relates to a low-pressure unit (1) for raising a pressure level in a hydraulic drive (8). The low-pressure unit (1) comprises a tank pressure accumulator (2) for storing a hydraulic fluid at a desired pressure, a low-pressure accumulator (3) downstream of the tank pressure accumulator (2) for intermediate storage of the fluid, and a hydraulic pump (4) driven by a motor (5). According to the invention, the tank pressure accumulator (2), the low-pressure accumulator (3), and the pump (4) are hydraulically coupled to one another via a connecting block (6), and the connecting block (6) is designed such that the low-pressure unit (1) can be directly integrated into or connected to a main control block of the hydraulic drive (8) via the connecting block (6), or is already integrated into or connected to it.

There is provided a fluid circuit capable of continuously driving pressure-increasing devices with a simple configuration. A plurality of pressure-increasing devices are connected in parallel to a fluid supply device that delivers a working fluid. A stroke direction of the piston of each of the pressure-increasing device is switched by the working fluid. A phase of the piston of one pressure-increasing device is different from a phase of the piston of the other pressure-increasing device.

According to the impact-cutting composite rock breaking hydraulic system and method for the mining heading machine, hydraulic damping and impact hammer collaborative operation are integrated, and the problems that a traditional heading machine is low in rock breaking efficiency, poor in stability and insufficient in adaptability are solved. The system comprises a cutting arm hydraulic damping system and an impact hammer hydraulic impact system, and multi-parameter closed-loop regulation and control are achieved through a controller. The device is characterized in that a double overflow protection mechanism is adopted, a proportional overflow valve and an external control overflow valve cooperate with each other, a hydraulic control one-way valve is combined for compensating an oil path, and the pressure difference of a hydraulic cylinder is dynamically kept stable; the impact hammer system adjusts the pressure of an energy accumulator through a proportional pressure reducing valve and is matched with a hydraulic control switch valve to realize variable impact energy control; based on feedback of a vibration sensor and a pressure sensor, damping and impact parameters of the cutting arm are adjusted in a self-adaptive mode through a nonlinear algorithm, and intelligent rock breaking operation under different rock stratum hardness is achieved. According to the system, the impact resistance stability, the rock breaking efficiency and the operation intelligence level of the heading machine are remarkably improved.

A patient handling apparatus includes a patient support surface, a base, and a hydraulic circuit. The hydraulic circuit includes a pump, a fluid reservoir, and a hydraulic cylinder operable to selectively raise or lower the patient support surface or the base. The hydraulic circuit controls flow of fluid between the cylinder and the fluid reservoir to thereby control the movement of the base or patient support surface. In addition, the hydraulic circuit may include a manual bypass circuit configured to bypass the pump in response to a manual input, which allows manual extension or retraction of the cylinder, for example, when the pump is not operational. The hydraulic circuit may also include a pump bypass circuit configured to bypass the pump to allow fluid to discharge from the cap end to the fluid reservoir for faster evacuation of fluid from the cylinder, thereby increasing retraction speed of the rod.

The invention discloses an integrated electro-hydraulic driving unit of a marine anchor and mooring machine. The integrated electro-hydraulic driving unit comprises an oil supplementing system, a main driving system, a control system, a safety system and a hydraulic motor, an oil supplementing pump in the oil supplementing system is connected with an oil drainage tank and communicated with a pressure oil tank in the main driving system, the pressure oil tank is communicated with a main pump in the main driving system through two third one-way valves, a port A and a port B of the main pump are communicated with a port A and a port B of a hydraulic motor respectively, and one ends of two safety valves in the safety system are connected with the port A and the port B of the main pump respectively. The other ends of the two safety valves are connected in parallel to a pipeline between the oil outlet of the pressure oil tank and the inlets of the two third one-way valves; a controller of the control system is in electric signal connection with the main motor; and an output shaft of the hydraulic motor is connected with an input shaft of the anchor windlass. Therefore, according to the design, the hydraulic pump station, the control valve and the hydraulic motor can be integrated, and the integration degree is high.

An accumulator includes: an exterior body including a bottom, a shell and a port; and a bellows provided inside the exterior body and having an S-shape being capable of expansion and contraction. In a case where the bellows has expanded maximally in the accumulator, the bellows has expanded from a free state where no load other than gravitational force is being applied to the bellows.

The utility model discloses an energy storage cylinder and system of a disc spring hydraulic mechanism, and the energy storage cylinder comprises a cylinder body which is internally provided with a cavity, a piston, a sealing ring and a high-pressure oil channel; the piston is movably arranged in the cavity; the cavity comprises a working cavity and a low-pressure cavity; one end of the working cavity is connected with the high-pressure oil channel, the other end of the working cavity is connected with the low-pressure cavity, and the diameter of the low-pressure cavity is larger than that of the working cavity. The sealing ring is arranged on the periphery of the piston and used for preventing high-pressure oil entering from the high-pressure oil channel from flowing into the low-pressure cavity when the sealing ring is located in the working cavity. The high-pressure oil channel is used for inputting high-pressure oil to push the piston to move towards the low-pressure cavity or outputting the high-pressure oil to enable the piston to move towards the direction away from the low-pressure cavity. And the low-pressure cavity is used for collecting high-pressure oil flowing out of the sealing ring when the sealing ring is separated from the working cavity. The low-pressure oil cavity with the diameter larger than that of the working cavity is formed in the energy storage cylinder, high-pressure oil leakage occurs at the position of the sealing ring, and energy storage of the energy storage cylinder is stopped.

The present invention provides a hydraulic system and a hydraulic control method for a self-propelled mowing and rolling machine. The hydraulic system of the self-propelled mowing and rolling machine includes: an integrated hydraulic valve block, a cutter bar lifting oil cylinder, a cutter bar tilting oil cylinder, a plurality of roller gap adjustment oil cylinders, and a pair of floating oil cylinders. The cutter bar lifting oil cylinder, the cutter bar tilting oil cylinder, the plurality of roller gap adjustment oil cylinders, and the pair of floating oil cylinders are all connected to the integrated hydraulic valve block through pipelines. Multiple groups of hydraulic control valves are integrated in the integrated hydraulic valve block, and the integrated hydraulic valve block is used to control the cutter bar lifting oil cylinder, the cutter bar tilting oil cylinder, the plurality of roller gap adjustment oil cylinders, and the pair of floating oil cylinders to perform corresponding operations, which facilitates the operation of the hydraulic system, simplifies the pipeline structure, reduces the hydraulic pipelines, improves the integration degree, and is convenient for the installation and maintenance of the hydraulic valve block.

A hydraulic arrangement (14, 214) for a work machine (1) comprising: a body (2) and a hydraulically actuated work implement (6); said hydraulic arrangement (14) comprises: pumping means (17) to suck hydraulic fluid from a tank (18) and to provide at outlet a pressurized flow of hydraulic fluid; one actuator (7) to operate the hydraulically actuated work implement (6); a hydraulic circuit (20) to put the source of hydraulic fluid (17) in communication with the hydraulic actuator (7); and a control valve arrangement (22) to selectively put the hydraulic circuit (20) in fluid communication with the hydraulic actuator (7); the hydraulic circuit (20) comprises: a first hydraulic line (21a) connecting the pumping means (17) with the actuator (7); a second hydraulic line (21c) connecting the tank (18) with the actuator (7); one hydraulic accumulator (26, 28) fluidly connected to the first hydraulic line (21a); the hydraulic accumulator (26, 28) comprises a first chamber (31a) connected to the first hydraulic line (21a) and a second preload chamber (31b), opposite to the first chamber (31a), connected to pumping means (17).

A controller of a wheeled hydraulic excavator executes control of a vibration suppression function to control the flow of a hydraulic fluid from a hydraulic cylinder that drives a work implement, thereby suppressing vibration of the hydraulic cylinder when the rotation speed of wheels reaches a predetermined speed or higher. Furthermore, the controller disables the control of the vibration suppression function when the vehicle body is jacked up by the work implement, even when a vibration suppression instructing device has given an instruction for enabling the control of the vibration suppression function.

A dynamic testing system includes a test station and at least one controller. The test station includes a hydraulic actuator configured to drive an actuation of a test subject using a hydraulic fluid flow, and a control valve that includes a housing, a valve body contained within the housing having a position that controls a flow rate and direction of the hydraulic fluid flow, a valve body driver configured to adjust the position of the valve body based on a reference signal, and a valve position sensor configured to output a position signal that is indicative of the position of the valve body. The at least one controller is configured to obtain a current position of the valve body using the position signal, obtain a diagnostic reference, detect a diagnostic condition based on a difference between the current position and the diagnostic reference, and generate a diagnostic signal.

The invention relates to the technical field of aerospace, in particular to a metallic diaphragm type low-temperature pressure accumulator for a carrier rocket, which comprises a pressure accumulator shell, the pressure accumulator shell comprises a multi-way and a plurality of sealing shells, the multi-way is provided with a plurality of interfaces, and the sealing shells are arranged in the multi-way. Any two opposite connectors in the multiple connectors are an inlet and an outlet used for being connected with a carrier rocket low-temperature propellant conveying pipeline, the sealing shells are arranged at the other connectors in the multiple connectors correspondingly, and a pressure adjusting cavity is formed in the inner space of each sealing shell. The metal film box assembly is arranged in the pressure regulating cavity; and the pressure regulating assembly is communicated with the metal film box assembly and is used for regulating the internal pressure of the metal film box assembly. The low-temperature pressure accumulator has the effects that the stability and reliability of the low-temperature pressure accumulator are improved, and vibration suppression requirements under different conditions are met.

A portable fluid tank system can include wireless control capabilities. The portable fluid tank system can include a fluid tank with an internal volume for fluid storage and a fluid actuation system for controlled fluid movement and pressurization. An electronics housing within the portable fluid tank system can accommodate a removable energy storage device, providing power to the actuation system. The portable fluid tank system can include a multi-state control interface, facilitating direct user interaction or remote operation via a wireless communication module. The module can receive and execute commands from a remote transmitting device, enabling remote activation and control of the fluid actuation system.

A hydraulic system for a passenger restraint device includes a hydraulic pump and a hydraulic section. The hydraulic section includes a hydraulic accumulator, a valve arrangement and a hydraulic cylinder unit with a piston. The valve arrangement is connected to the hydraulic pump, the hydraulic accumulator and the hydraulic cylinder unit. The piston can be moved between an open position and a first closed position. The hydraulic pump can pressurize the hydraulic cylinder unit so that the piston moves from the first closed position to the open position. The hydraulic accumulator is configured so that the piston moves from the open position to the first closed position. The hydraulic cylinder unit can be pressurized in a first switching position of the valve arrangement with a first pressure stage and in a second switching position of the valve arrangement with a second pressure stage lower than the first pressure stage.

A hydraulic oil supply device for an industrial vehicle includes: a first hydraulic oil tank; a second hydraulic oil tank; an upper communication pipe; a lower communication pipe; a first hydraulic oil pipe configured to communicate the first hydraulic oil tank with a hydraulic oil supply target and to be provided with a suction port; a second hydraulic oil pipe configured to communicate the hydraulic oil supply target with the second hydraulic oil tank and to be provided with a discharge port; and a hydraulic oil pump. The second hydraulic oil tank is an airtight tank sealed hermetically against outside air. The upper communication pipe has a first open-end portion and a second open-end portion. The first open-end portion has an opening height higher than an opening height of the suction port. The second open-end portion has an opening height higher than an opening height of the discharge port.

The disclosure relates to an hydraulic accumulator, in particular a diaphragm accumulator, having an accumulator housing and a separating element disposed therein, which separates two media spaces from each other, wherein a weld seam is formed by a laser or electron beam welding process without any filler materials, in that at least a part of the wall parts delimiting the transition point are melted to form the weld seam, which closes off the transition point towards the surroundings, in a manner that is free of protrusions with respect to an outer circumferential surface of a connection element.

A method is provided for determining a gas charge pressure PcalcGC of a hydraulic accumulator within a hydraulic fluid system. The method includes receiving pressure decay data representing the pressure decay within a self-pressurizing hydraulic reservoir of the hydraulic fluid system as the self-pressurizing hydraulic reservoir depressurizes from an operating pressure of the self-pressurizing hydraulic reservoir towards atmospheric pressure. The method also includes calculating the gas charge pressure PcalcGC of the hydraulic accumulator using the received pressure decay data of the self-pressurizing hydraulic reservoir.

An aerial work platform and a floating control system thereof, the system comprising a driving mechanism, a hydraulic oil tank, a hydraulic pump, a floating control valve, a floating mechanism, a boom function valve, an actuator, and an accumulator: the floating control valve comprises a first one-way valve, a second one-way valve, a pressure reducing valve, and a logic valve; and an oil inlet of the first one-way valve serves as the oil inlet of the floating control valve, an oil outlet of the first one-way valve is connected to a pipeline connecting the accumulator, the pressure reducing valve and the logic valve, the logic valve is connected to the second one-way valve, an oil outlet of the second one-way valve serves as the feedback oil port of the floating control valve, when the hydraulic pump is a variable displacement pump, a feedback oil port of the floating control valve and a feedback oil port of the boom function valve are connected to a feedback oil port of the variable displacement pump; when the hydraulic pump is a fixed displacement pump, a feedback oil port of the floating control valve is connected to a feedback oil port of the boom function valve. The invention can reduce the power loss and improve the reliability of the system.

A method of assembling an accumulator for a suspension damper where the method includes the steps of forming an outer shell of an accumulator, assembling a bellows assembly by connecting distal and proximal plates to opposite ends of an annular bellows wall, and inserting the bellows assembly into the outer shell. The outer shell is formed such that it includes a distal end with an end wall and an open end opposite the distal end. The bellows assembly is inserted into the open end of the outer shell with the distal plate facing the end wall of the outer shell. The method proceeds with coupling the distal plate of the bellows assembly to a stem of a gas charging port on the end wall of the outer shell at a fixed axial position using a fixation component that engages the stem of the gas charging port.

The invention relates to the technical field of ship mooring systems, and discloses a self-energy-storage device and method applied to mooring constant tension. A piston pull rod of the hydraulic cylinder is connected with one end of the cable; an energy storage module; the energy storage module comprises a first energy accumulator and a second energy accumulator, the volume of the second energy accumulator is larger than that of the first energy accumulator, and the maximum pressure intensity of the first energy accumulator is set to be larger than that of the second energy accumulator; the first energy accumulator and the second energy accumulator are connected with an oil cavity of the hydraulic cylinder through hydraulic pipelines respectively. The first energy accumulator and the second energy accumulator are connected through a hydraulic pipeline. The pressure in the hydraulic cylinder is adjusted by adjusting the hydraulic oil amount in the hydraulic cylinder through the first energy accumulator and the second energy accumulator, so that the tension in the mooring rope is constant within a preset value during working. By storing self-generated energy of ship movement, the problems that extra energy consumption is needed for providing constant tension for ship mooring, and cable tension and elongation are insufficient are solved.

The invention relates to the technical field of integrated hydraulic station systems, and discloses an integrated hydraulic station system based on intelligent control. The integrated hydraulic station system comprises an intelligent control core module, a power and transmission control module, a monitoring and feedback adjusting module, a safety and protection module, a fault diagnosis and early warning module, a network communication and remote monitoring module and a system integration and cooperation module. The intelligent control core module comprises a central controller and a data acquisition and processing unit; the power and transmission control module comprises a hydraulic pump set and a hydraulic motor; the monitoring and feedback adjusting module comprises a sensor network and a human-computer interaction interface; the safety and protection module comprises an energy accumulator, a safety valve, an overflow valve, a filter and a cooler; the network communication and remote monitoring module comprises a network communication unit and a remote monitoring platform; through the system, the working stability and reliability of the hydraulic system can be improved.

A load-controlled hydraulic supply for an attachment attached to an agricultural tractor includes a hydraulic high-pressure source providing a volume flow in a supply line, a return line leading to a hydraulic reservoir, and a load-indicating line connected to a device for pressure limiting. The volume flow is adjusted based on pressure feedback prevailing at the load-indicating line.

A fluid management system may include a fluid pump capable of generating a pulsatile flow of fluid, a fluid pathway for transporting the pulsatile flow of fluid from a fluid source through the fluid pump to a medical device, a dampening element in fluid communication with the fluid pathway and operably independent of the fluid pump, the dampening element comprising one or more barrels, each barrel including a movable seal member disposed within the barrel and a biasing member disposed within the barrel and engaged with the movable seal member, the dampening element being responsive to pressure fluctuations of the pulsatile fluid flow to actively dampen the pressure fluctuations, and a fluid flow sensor disposed along the fluid pathway between the dampening element and the medical device to measure a flow rate of the smoothened pulsatile fluid flow in both flow directions.

A hydraulic pump system includes a housing defining a tank for containing hydraulic fluid in use; one or more pump modules each comprising a hydraulic pump for supplying hydraulic fluid from the tank to a hydraulic system; and a mounting arrangement; wherein the or each pump module is mounted to the housing by the mounting arrangement.

The invention discloses a pump source, which relates to the technical field of hydraulic pressure and comprises an oil return pipe, a main energy accumulator type pump, an auxiliary energy accumulator and an output pipeline, a main piston, a heavy hammer and a driving mechanism are connected in the main energy accumulator type pump, a first working cavity is formed below the main piston, and an oil tank is formed above the main piston; the driving mechanism is connected with the main piston through a clutch; after the clutch is separated, the driving mechanism is separated from the main piston and the heavy hammer, the main piston and the heavy hammer pressurize oil in the first working cavity by means of gravity, and the oil is conveyed outwards through the output pipeline so as to achieve the state of supplying oil outwards. When the clutch is combined, the driving mechanism is used for driving the main piston and the heavy hammer to move upwards, lifting of the main piston and the heavy hammer is achieved, so that oil in an oil tank located above the main piston is pumped and supplemented into a first working cavity, the oil pumping state of the main energy accumulator type pump is achieved, and the auxiliary energy accumulator maintains the state of supplying oil to an output pipeline in a pressure maintaining mode; therefore, the pump source continuously supplies oil to the outside.

An additional hydraulic device for a pitch system of a wind turbine, the additional hydraulic device including a hydraulic motor, a hydraulic accumulator for storing hydraulic energy, a valve unit, a return line and a reservoir. The return line is connected to the reservoir. The valve unit is switchable to a drive switching position, and the hydraulic motor is connected to the hydraulic accumulator in the drive switching position. The energy stored in the hydraulic accumulator drives the hydraulic motor in the drive switching position so that the hydraulic motor delivers an additional force component.