689 results about "Hydraulic drive system" patented technology

The invention belongs to the technical field of hydraulic transmission and control, and discloses a high-precision positioning control method and system of a servo electro-hydraulic actuator. Real-time operation parameters of a servo electro-hydraulic actuator under different working frequencies are obtained, a servo valve dynamic return difference characteristic curve is constructed, a return difference characteristic change mode is extracted, and a dynamic influence model of return difference characteristic change on positioning precision is established. Based on the model, a frequency self-adaptive compensation strategy is designed in combination with a pressure fluctuation value of a hydraulic system, and real-time correction of a servo valve control signal is achieved. According to the method, a differentiation strategy combining low-frequency feed-forward compensation and high-frequency feedback compensation is innovatively adopted, a smooth transition mechanism is designed, and the problem that the positioning precision fluctuates under the frequency change working condition in a traditional control method is solved. According to the invention, high-precision positioning control of the servo electro-hydraulic actuator in a full frequency band range is realized, and the positioning precision and stability of the system under a dynamic working condition are improved.

The invention relates to an intelligent oil containment boom mechanical arm device and a control method thereof. The intelligent oil containment boom mechanical arm device comprises a mechanical arm, a hydraulic driving system, a sensing system and a control unit. The mechanical arm comprises a transmission base, a steering stand column, a large arm, a small arm, an overturning head and a tail end grabbing hook assembly. The hydraulic driving system comprises a hydraulic pump station, a proportional reversing electromagnetic valve group and a plurality of execution oil cylinders; the sensing system comprises a gyroscope array and a camera array to form a distributed attitude sensing network and a distributed visual sensing network; the control unit identifies and positions an oil containment boom target based on a sea surface image acquired by the distributed visual perception network, performs motion planning on the mechanical arm, and controls the mechanical arm to move and grab the target; in the target positioning process, posture changes of all parts of the mechanical arm are sensed in real time based on the distributed posture sensing network, and dynamic compensation is conducted on the posture error of the mechanical arm. According to the device, the oil containment boom can be quickly, accurately, reliably and intelligently grabbed, and the laying efficiency and safety of the oil containment boom are improved.

In a hydraulic drive system used for an electrically driven hydraulic work machine that drives a hydraulic pump by an electric motor and supplies a hydraulic fluid to plural actuators to carry out work, the power consumption of the hydraulic pump is kept from exceeding a value decided in advance. For this purpose, a controller calculates target power to be consumed by the hydraulic pump on the basis of the capacity of the hydraulic pump, the delivery pressure of the hydraulic pump sensed by a pressure sensor, and a target revolution speed of the electric motor, and limits the target revolution speed of the electric motor in such a manner that the target power falls within a range of the maximum allowable power.

The invention discloses a motor temperature control method and system based on hydraulic transmission and fuzzy control. The method comprises the steps that current temperature data are collected in real time through temperature sensors arranged in a plurality of key temperature areas in a driving motor and preprocessed; predicting the temperature change trend of the key temperature zone by adopting a self-learning fuzzy control algorithm, and generating a hydraulic coarse tuning signal and an electromagnetic fine tuning signal; controlling a hydraulic actuating mechanism to adjust the flow of a cooling medium to realize preliminary cooling, and controlling an electromagnetic fine adjustment mechanism to adjust the flow of the cooling medium corresponding to a local area in the key temperature area to perform temperature compensation; and uploading the regulated current temperature data to a cloud platform in real time, updating control parameters, and feeding back the control parameters to a self-learning fuzzy control algorithm to form closed-loop control. According to the invention, real-time dynamic balance regulation and control of the temperature of each key temperature zone in the driving motor can be effectively realized, and local thermal load changes are quickly responded, so that the overall temperature of the driving motor stably reaches a preset standard.

The invention relates to a digital twin modeling method and consistency optimization method of hydraulic forming equipment, and the method comprises the steps: building a digital twin model of the hydraulic forming equipment which comprises terminal forming equipment, a hydraulic driving system and a controller, the digital twin model comprises a multi-body dynamics simulation unit, a hydraulic system simulation unit and a control system simulation unit; operating data of the hydraulic driving system and the terminal forming equipment are acquired through the data acquisition system, and the operating data are input into the hydraulic system simulation unit and the control system simulation unit; the control system simulation unit generates a simulation control signal by adopting feedback control logic based on the operation data and sends the simulation control signal to the controller and the hydraulic system simulation unit; the hydraulic system simulation unit generates a simulation driving signal according to the operation data and the simulation control signal and sends the simulation driving signal to the multi-body dynamics simulation unit, and the multi-body dynamics simulation unit displays the motion condition of the terminal forming equipment based on the simulation driving signal.

The present invention relates to a vertical take-off and landing (VTOL) aircraft featuring a central fuselage and at least two power units. Each power unit is connected to at least two separate lifting rotors via transmission lines, ensuring that each power unit is linked to at least two rotors diametrically opposed relative to the centre of gravity of the aircraft. The lifting rotors might be driven by power transmission lines of hydrostatic type. The power units on either side might be housed in separate pods which might be incorporated into the main fuselage or arranged as separate pods. These separate pods might also function as floats / pontoons for the aircraft to land, take-off and manoeuvre on water.

The invention discloses an anti-overturning active control method and device for a single-column pier bridge and a medium. The method comprises the steps that a thundersight displacement monitoring system and a hydraulic driving system are deployed; leighting multi-mode fusion data are obtained, and the transverse overturning angle of a beam body is calculated; constructing a digital twinborn body for predicting the overturning state of the bridge structure, and predicting the overturning states of the bridge at multiple moments in the future; and constructing an intelligent agent, and controlling the hydraulic driving system to execute an anti-overturning action based on the predicted bridge overturning state. The device and the medium are both used for implementing the method. The beneficial effects of the invention are that the structure displacement monitoring method based on Reighting heterogeneous fusion is provided for a traditional mode of a single structure displacement detection means, interference factor identification and weighted fusion in different environments are realized, and the reliability of monitored structure displacement data is ensured.

The utility model relates to the technical field of hydraulic driving, and provides a hydraulic driving system. The hydraulic driving system comprises a hydraulic cylinder, a driving oil way and an electric driving structure. The hydraulic cylinder comprises a cylinder body with a cavity, a piston arranged in the cavity in a sliding mode and a piston rod connected to the piston. The piston and the piston rod jointly divide the cavity into a rodless cavity and a rod cavity. The driving oil path is communicated with the rodless cavity and the rod cavity; the electric driving structure is arranged in the rod cavity and comprises a permanent magnet and a winding, the permanent magnet and the winding are sleeved, one is arranged on the cylinder body, and the other is arranged on the piston rod or the piston. According to the hydraulic driving system provided by the invention, the response speed and the response range are improved and expanded through combination of two modes of hydraulic driving and electric driving, and the hydraulic driving system has higher safety redundancy.

The invention discloses a self-adaptive parameter control system and method for a halfpace field rice transplanter based on full-hydraulic transmission, particularly relates to the technical field of hydraulic parameter control, and aims to solve the technical problem of dynamic power competition between a walking system and a planting device when the full-hydraulic transmission rice transplanter works in a halfpace field. Working pressure signals of a walking motor and a planting device are monitored in real time, the divergence degree of envelope lines of the two pressure signals is calculated so as to recognize the power competition state of a system, and when power competition is detected, the required power of two execution mechanisms is dynamically calculated, and a hydraulic pump displacement distribution coefficient is generated; and then the interaction characteristics of the outlet pressure of the main pump and the output flow signal and the transmission characteristics of the pressure signal of the executing mechanism are fused, the dynamic balance degree of the system is generated, the displacement distribution coefficient is corrected, and finally the opening degree of the walking motor and the proportional valve of the planting device is synchronously adjusted based on the corrected coefficient. Accurate distribution and dynamic balance control of the power of the hydraulic system are achieved.

The invention belongs to the technical field of metal material cold machining strengthening, and particularly relates to an omni-directional powerful numerical control rolling machine tool for axle strengthening, which comprises a machine tool body, and a spindle box, a radial feeding mechanism and a tailstock which are sequentially arranged on the machine tool body, opposite rotary tables are arranged above the radial feeding mechanism, and rolling devices are arranged on the rotary tables; the rolling device is internally provided with two rolling heads arranged back to back, and the rolling heads are switched through a rotary table. The invention further discloses an axle strengthening machining method which comprises six steps that three-dimensional space accurate positioning is achieved through the axial and radial numerical control seven-axis linkage interpolation technology, and the rolling device is pushed through the hydraulic driving system to apply high-strength acting force; the rotary table is adopted to drive the rolling heads to quickly switch the rolling heads for different shaft sections, so that the efficiency is improved; the device has the advantages of high automation, large rolling force, high reliability and the like, the roughness of the workpiece surface is remarkably reduced, the surface hardness is improved, the axle surface layer is strengthened, the wear resistance is improved, and the service life is prolonged.

The invention discloses a foam performance test device and method for a hydraulic transmission medium. The foam performance test device for the hydraulic transmission medium comprises a frame body, and a balancing weight, an injector and a container which are sequentially arranged from top to bottom, the injector is connected with the frame body and comprises a needle cylinder, a needle head and a push rod, the needle head is detachably connected with the needle cylinder, the needle cylinder is provided with an injection cavity used for containing liquid to be detected, the needle head is provided with a downward jet orifice, the jet orifice is communicated with the injection cavity, and the piston push rod is slidably arranged in the injection cavity. The container is provided with a containing cavity used for containing the liquid to be detected, the containing cavity is provided with an upward cavity opening, and the cavity opening is formed in the lower side of the injection opening. According to the foam performance testing device for the hydraulic transmission medium, the use working condition that the hydraulic transmission medium generates foam under impact can be simulated, and the accuracy of a test result is higher.

The application discloses a reverse thrust device locking mechanism and an aero-engine comprising the same, the reverse thrust device locking mechanism comprising a shell, a liquid supply part and a locking rod, the shell comprising an internal cavity, a liquid inlet and a liquid outlet which are in communication with each other, the first end of the locking rod being arranged in the internal cavity, the second end of the locking rod extending to the outside of the shell and being capable of engaging with a moving cover, the locking rod being arranged to switch between a locking position and an unlocking position according to the pressure on the side of the liquid inlet; in the locking position, the locking rod engages with the moving cover, and the reverse thrust device locking mechanism is in a locked state; in the unlocking position, the locking rod moves along the axial direction thereof to the side away from the moving cover, and the reverse thrust device locking mechanism is in an unlocked state. The application drives the movement of the locking rod through hydraulic pressure, and has the advantages of simple working principle, high stability, simple structure of hydraulic transmission, no need to arrange electrical control equipment such as electromagnetic valves, no need to design a complex circuit layout, and effective reduction of production and assembly costs.

The application discloses a kind of based on wind power energy's breeding-data fusion platform and its control method, belong to marine engineering equipment technical field.The platform includes SPAR type floating foundation, wind power generation unit, liftable rigid culture net cage, guide mechanism, data equipment cabin, energy storage and control system and mooring system.Guide mechanism includes the vertical guide rail fixed to the outside of main column, the guide unit group with the sliding cooperation of guide rail and replaceable composite gasket.Hydraulic drive system and locking device are arranged between main column and net cage, and hydraulic drive system drives net cage to switch between normal breeding station, maintenance station and anti-taiyin station.Data equipment cabin is used to collect water quality, fish behavior and equipment state data, and energy storage and control system receives wind power and supplies power and outputs control instruction.The application realizes closed-loop control of wind power energy supply and breeding monitoring, improves the guiding reliability of net cage lifting, anti-taiyin ability and maintenance accessibility.

The utility model relates to a kind of slot type solar concentrator hydraulic drive device, including concentrator push-pull oil cylinder and its hydraulic drive system, the oil tank of hydraulic drive system is connected with energy accumulator, concentrator push-pull oil cylinder by motor and pump group unit, high-pressure pipeline, valve control unit, the oil tank is aluminum alloy die-casting oil tank, the aluminum alloy die-casting oil tank upper along with the platform lower surface is sealed, waterproof, dust cover is installed on platform upper portion, platform one side fixed mounting adapter mounting vertical plate, the both sides of waterproof, dust cover are equipped with quick detach buckle, so the connection between dust cover and oil tank is fixed without bolt connection, just press buckle, dust cover can be locked, greatly reduce the work hour amount of disassembly and assembly, improve installation efficiency, save time cost.The utility model is resistant to-40°C low temperature, waterproof and dustproof performance is high, with good protective performance, easy to repair and maintain, can be stable under harsh environment, high precision and high service life.

An agricultural work vehicle equipped with a hydrostatic transmission (HST) is provided. The agricultural work vehicle may comprise: a hydraulic pump including a pump swash plate and supplying a working fluid according to the angle of the pump swash plate; a swash plate control motor for generating power for adjusting the angle of the pump swash plate; an actuator for operating the swash plate shaft of the pump swash plate by using the power generated by the swash plate control motor; a link unit for transmitting the power generated by the swash plate control motor to the actuator; and a control unit for controlling the rotation of the swash plate control motor on the basis of the manipulation state of an HST manipulation unit.

The utility model relates to the technical field of hydraulic transmission parts in ground spring door control system discloses three -segment type variable curvature cam ground spring hydraulic transmission assembly, including the shell, the inside fixed connection of shell has the bearing, the inside fixed connection of bearing has the connecting rod, the outer wall fixed connection of connecting rod has the disc, the inside of shell is provided with resistance assembly, the upper surface of shell is provided with the apron, the inside of apron is provided with screw nail, the lower surface rotation is connected in the inside of shell of disc, the outer wall screw thread connection in the inside of shell of screw nail. In the utility model, in the utility model, through pushing the door and driving the connecting rod rotation, the connecting rod drives disc 4 rotation, disc pushes the gyro wheel rotation, gyro wheel drives the pressure rod and makes second spring contract or release the elastic force, thereby reaches the effect that the curvature of disc 4 gradually changes according to the door body opening angle.

A medical radiology department diagnosis and observation device disclosed by the present invention comprises a base and a sightseeing lamp, the surface of the sightseeing lamp is provided with a display screen, a flat plate is fixedly connected above the sightseeing lamp, the flat plate is fixedly connected with a hydraulic pipe, the hydraulic pipe is slidably connected with a pushing pipe, and the bottom of the pushing pipe is fixedly connected with a fixed toothed plate. A springback spring is fixedly connected to one side of the fixed toothed plate, a thin gear is connected to the bottom of the fixed toothed plate in an engaged mode, a plane rack plate is connected to the bottom of the thin gear in an engaged mode, an extrusion frame is fixedly connected to the side face of the plane rack plate, and a compression spring rod is fixedly connected to the side, close to the sightseeing lamp, of the extrusion frame. The hydraulic transmission system is driven by treading the friction block, so that the extrusion frame push plate automatically fixes the film, the extrusion plate does not need to be manually twisted, the film clamping time is remarkably shortened, and in a batch diagnosis scene, repeated mechanical operation of a doctor can be effectively reduced, more energy is focused on image analysis, and the response speed during emergency consultation is remarkably increased.

The present application belongs to the field of hydraulic transmission and automatic control technology, and discloses a kind of hydraulic motor stepless speed regulation control system and method based on eccentricity inverse calculation.By collecting the angle signal of two swing cylinders, combining the preset geometric position relationship between the center of swing cylinder base and the center of output shaft, the eccentric center position and the actual eccentricity are inversely calculated; the target eccentricity is determined according to the target speed, and the error between the target eccentricity and the actual eccentricity is taken as the control input, the servo valve control quantity is obtained through the PID operation of the controller, the variable executing mechanism is driven to continuously adjust the eccentric mechanism position, so as to realize the continuous change of hydraulic motor displacement and the continuous stepless regulation of speed. The control process can also be combined with zero correction, direction consistency correction, differential filtering, anti-integral saturation, dead zone compensation and output amplitude limiting to improve the speed regulation stability and control accuracy. The present application solves the problems of difficult measurement of internal eccentric mechanism state of hydraulic motor and difficult continuous speed regulation in wide speed range.

A hydraulic drive system for adaptively controlling the speed of a cooling fan of a rail engineering vehicle is provided. The oil outlet of a hydraulic plunger variable pump is connected to one end of a pressure pipe connected to a hydraulic motor, and the other end of the pressure pipe is connected to the oil inlet of a temperature-controlled proportional valve group. One oil outlet of each temperature-controlled proportional valve group is connected to an oil return pipe via a hydraulic oil radiator, and the oil return pipe is connected to a hydraulic oil tank. Two branches of the oil return pipe are respectively connected to the other oil outlets of the two temperature-controlled proportional valve groups. A safety protection structure connected in parallel with the hydraulic motor is provided on the pressure pipe, and the hydraulic plunger variable pump is connected to a flow regulation structure. The present invention solves the drawbacks of large system pressure shocks and extremely high noise generated when traditional on-off valve groups control the cooling fan. The system power is dynamically matched in real time according to the heat dissipation requirements to ensure safe operation of the vehicle, reduce the impact of instantaneous starting and stopping of the cooling fan, reduce the noise generated, and increase the available traction power of the vehicle power system.

The application relates to the technical field of boring machines, and discloses a double-sided counter-boring combined machine tool with a self-positioning function, which comprises a first track seat and a second track seat arranged at the middle part of the outer side of the first track seat, two groups of first feeding mechanisms are symmetrically arranged above the first track seat, a second feeding mechanism is arranged above the second track seat, and positioning assemblies are arranged on the two sides of the upper end of the second feeding mechanism; through linkage cooperation of the first feeding mechanism, a hydraulic transmission assembly and a spiral guide structure, multiple self-positioning of the axial direction, the radial direction and the forward and reverse rotating direction of a shaft piece can be automatically completed, thereby manual step-by-step adjustment positioning constraint is not needed, multi-dimensional limiting can be synchronously completed through single feeding action, the shaft piece clamping operation process is greatly simplified, the clamping auxiliary time length is shortened, and meanwhile, the synchronous constraint in multiple directions can comprehensively limit various types of movements in the shaft piece machining process, so that machining deviation caused by the fact that clamping positioning is not in place is avoided from the root.

Hydrostatic transmission for a drive system, comprising a drive shaft (4) of a primary unit (1) that can be coupled to an internal combustion engine of the drive system and a secondary unit (2) that can be coupled to an output of the drive system, wherein the two units (1, 2) are fluidically connected to each other via two working lines (10) of a closed circuit, and wherein the primary unit (1) has an adjustable swivel angle (angle_pump) and an adjustable displacement volume (Vg_pump) that can be controlled by an electrical control unit (8) when the hydrostatic transmission is braked, characterized by a controller (38;138), from which a correction value (Vg_pump_add_incr) for the swivel angle (angle_pump) or the displacement volume (Vg_pump) can be output, wherein the correction value (Vg_pump_add_incr) can be added to a swivel angle (angle_pump_brake) or displacement volume (Vg_pump-brake) pre-controlled by the control unit (8), wherein an input variable of the controller (38; 138) is a speed difference (Δn_eng) between an actual speed (n_eng_act) of the internal combustion engine or a quantity derived therefrom (n_pump_act) and a maximum speed (n_eng_max) of the internal combustion engine or a quantity derived therefrom (n_pump_max).;

The invention discloses a mesh layout hydraulic driving system based on a topology principle in the technical field of hydraulic driving, which comprises a first hydraulic cylinder, a second hydraulic cylinder, a third hydraulic cylinder and an oil tank, the hydraulic cylinders are connected in series through a bus to form a network for oil supply, and additional driving pumps are added among the hydraulic cylinders. The driving pump and the hydraulic cylinders form network-shaped multi-node-connected topological form distribution, the oil way flow direction and pressure distribution in the hydraulic system are dynamically adjusted by means of the flexibility of network topology according to the requirement of driving force, the energy transmission path can be optimized, pressure and flowing of hydraulic oil can be reasonably distributed, and the energy transmission efficiency is improved. The defects that a traditional pump control system is poor in dynamic performance and limited in energy efficiency improvement are overcome, under the condition that driving power is not increased, the maximum driving force of a single hydraulic cylinder can be improved, the driving force of each hydraulic cylinder can be finely controlled, and the hydraulic driving system is more flexible.

To provide a poppet valve device that can improve controllability related to a flow rate.SOLUTION: A poppet valve device comprises: a housing including a valve passage, a valve seat interposed in the valve passage, a valve hole comprising a back pressure chamber to which an upstream pressure of the valve passage is guided, and a discharge flow passage leading to the back pressure chamber; a poppet valve element housed in the valve hole so as to be capable of being seated on and separated from the valve seat, to be stroked in accordance with a back pressure of the back pressure chamber, and for opening the valve passage at an opening degree according to a stroke amount; and a spool for adjusting the back pressure by controlling the opening degree of the discharge flow passage. The discharge flow passage is connected to a tank.SELECTED DRAWING: Figure 1

The invention discloses an inclined rail numerical control lathe for flange machining, and relates to the technical field of flange machining. The inclined rail numerical control lathe for flange machining comprises a shell, a speed reducer body, a three-jaw chuck, an inclined rail and a sliding saddle, a drill bit is arranged on the sliding saddle, a supporting mechanism used for supporting the end face of the flange is arranged on the side wall of the speed reducer body, the supporting mechanism comprises a supporting plate, and the supporting plate is connected with the side wall of the speed reducer body through a moving mechanism. A receding hole is formed in the side wall of the supporting plate. According to the inclined rail numerical control lathe for flange machining, through the synergistic effect of the supporting mechanism, the hydraulic transmission structure and the pushing mechanism, self-adaptive constant supporting and supporting force dynamic adjustment of the inner side end face during flange machining are achieved, deformation of the flange end face is effectively avoided, and the drilling precision and the machining quality are improved.

The application discloses a double-push-rod hydraulic deviation rectifying device, relates to the technical field of conveyor belt deviation rectifying, and comprises mounting plates and mounting racks rotatably connected to the mounting plates, two first mounting pipes are rotatably connected to the two sides in the mounting rack, an adjusting pipe is fixedly connected between the two first mounting pipes, and a deviation rectifying adjusting mechanism is arranged on the adjusting pipe and the mounting rack. The double-push-rod hydraulic deviation rectifying device is fixedly installed on the conveyor through the mounting plates. When the belt on the conveyor deviates, the hydraulic transmission control mechanism is driven to operate, then the hydraulic transmission control mechanism starts the electric hydraulic push rod to operate, the electric hydraulic push rod drives the mounting rack to rotate, thereby driving the belt to move, the belt is inclined to one side, the adjusting roller drives the belt to move, and the belt moves to the middle position of the mounting rack, so that the deviated belt is automatically rectified.

The embodiment of the application provides a kind of digital hydraulic closed pump control system and its control method, it can be applied to hydraulic transmission and control technical field, the system includes: closed hydraulic circuit, with high-pressure side oil circuit and low-pressure side oil circuit;Digital hydraulic valve group includes cartridge valve between high-pressure side oil circuit and low-pressure side oil circuit, cartridge valve has control cavity, the pressure in control cavity is used to control the conduction state of cartridge valve, multiple high-speed switch valve is connected with the control cavity of cartridge valve, for controlling the pressure of control cavity;Controller is configured to: when the pressure gradient of high-pressure side oil circuit exceeds limit value, multiple high-speed switch valve is output first control signal to drive multiple high-speed switch valve to adjust the pressure in control cavity, to make high-pressure side oil circuit and low-pressure side oil circuit at least partially conductive;When the pressure gradient does not exceed limit value, multiple high-speed switch valve is output second control signal to drive multiple high-speed switch valve to make cartridge valve keep closed state.

The invention relates to the technical field of orthodontic appliances, in particular to a self-adjusting arch expander based on hydraulic transmission, which comprises a jaw plate and a tooth sleeve, the tooth sleeve is arranged on the side wall of the jaw plate, a liquid storage bag is arranged in the tooth sleeve, and after the tooth sleeve is worn on a tooth, the liquid storage bag is positioned on a tooth occlusal surface; the jaw plate comprises a first part and a second part which can be far away from each other, a connecting pipe is arranged between the first part and the second part, and two ends of the connecting pipe are respectively arranged in the first part and the second part; a piston is arranged in the connecting pipe and provided with a push rod, the push rod is connected with the first part and the second part, so that when the piston pushes the push rod to move, the first part and the second part are pushed to be away from each other, a one-way valve is arranged in the connecting pipe, and the liquid storage bag is communicated with the one-way valve. According to the occlusal force of a patient, automatic arch expansion is achieved, the size of arch expansion force can be adjusted in a self-adaptive mode according to the size of the occlusal force of the patient, and the effect of improving the comfort and convenience of the patient after wearing is achieved.

A power machine can include a power machine frame, an electric power source supported by the power machine frame, an electric motor powered by the electric power source, and a hydrostatic transmission powered by the electric motor. The electric motor can power the hydrostatic transmission via a power transmission assembly that transfers power from the electric motor to the hydrostatic transmission at a reduced rotational speed.