7783results about "Servomotor components" patented technology

The invention discloses a deep sea underwater electro-hydraulic actuator (EHA) and a control system thereof. The system provides power through the power source module, balance of system oil pressure and pressure of external seawater is controlled through the pressure compensation module, oil circulation and oil pressure control are conducted through the integrated valve set module, a control instruction of the control module is executed through the execution mechanism module, and the control module conducts cooperative control over the whole system. According to the control system, the unbalanced pressure between the system and the deep sea high-water-pressure environment is compensated through the pressure compensator so as to reduce the influence of the deep sea high-water-pressure environment, meanwhile, the pressure compensator serves as an oil tank to supply oil, miniaturization of the system is achieved, and the reliability of the system during underwater work is improved; according to the deep-sea underwater electro-hydraulic actuator, the mounting positions and internal flow channels of all elements of the integrated valve bank are optimized, the pressure loss of fluid in the flow channels is reduced, and the energy utilization efficiency of the deep-sea underwater electro-hydraulic actuator is improved; the asymmetric hydraulic cylinder can operate in four working conditions of deep sea, and underwater high-precision movement can be completed.

The invention discloses a hydraulic control system, which belongs to the field of hydraulic control, and comprises a power execution module, a control regulation module and a sensing feedback module, in the slurry manufacturing stage, data are collected through a sensor, the abnormal condition of the slurry temperature is detected to judge whether the slurry temperature is adjusted or not, and based on the real-time slurry viscosity, the rotating speed of a stirring shaft is adjusted in a self-adaptive mode by adjusting the hydraulic flow of a hydraulic motor of a stirring driver; acquiring driver data to monitor a control instruction implementation result, performing abnormality evaluation analysis on a driver through threshold judgment and abnormality score calculation, and generating an updated driver control signal after a driver instruction regeneration signal is received; monitoring abnormal conditions of data acquired by various deployed sensors, monitoring abnormal data of the sensors, and monitoring duration of the abnormal data so as to carry out abnormal early warning and generate abnormal early warning information; the problem that the slurry temperature of die-casting equipment under hydraulic control is difficult to adaptively adjust and disturb is solved.

The invention discloses a balance valve, a hydraulic control system and an operation machine. A valve cavity is formed in a valve body of the balance valve, and an oil inlet and an oil return opening are formed in the circumferential wall of the valve cavity; the valve element and the control piston are inserted into the valve cavity in a sliding mode from the two axial ends, the valve element comprises a first element body and a second element body which is inserted into the first element body in a sliding mode in the axial direction, and a first concave part and a second concave part which are arranged at intervals in the axial direction are formed in the peripheral wall of the first element body. A first cavity and a second cavity are respectively formed between the first concave part and the inner peripheral wall of the valve cavity and between the second concave part and the inner peripheral wall of the valve cavity, so that the overflowing area between the first core body and the valve cavity can be increased, and the oil inlet and the oil return port are respectively and correspondingly communicated with the first cavity and the second cavity; the driving end of the control piston penetrates through the first core body, the control piston and the second core body are coaxially and oppositely arranged in a spaced mode, and the control piston moves in the axial direction to drive the second core body to move in the axial direction and drive the first core body to move, so that oil in the first cavity and oil in the second cavity are communicated or blocked.

A method for detecting a safe state of a switchable valve of a hydraulic system of an actuator in a motor vehicle includes the at least one first switchable valve, which is actuated by being energized, a pump, and a controller which controls at least the first switchable valve and the pump. The pump delivers the fluid to a first load in a first rotational direction and to at least one second load in a second rotational direction.

Embodiments of a manifold of a hydraulic fracturing system include a junction having an inlet flow bore. The junction can include an integrated flow junction and valve check assembly having a body including a central portion and one or more side portions. The central portion can be positioned between a pair of manifold sections of the manifold and attached thereto. The one or more side portions extend radially from the central portion and include an inlet bore through which a pressurized fluid is received and supplied to the manifold. One or more check valves is positioned along the inlet bore so as to be integrated within the body of the junction.

The invention provides an underground coal mine air and water pumping switching electro-hydraulic control system and method, the electro-hydraulic control system comprises an air supply control module, a water supply control module, a negative pressure control module and an oil supply module, and the method adopts a remote control system to control the underground coal mine air and water pumping switching electro-hydraulic control system. According to the underground coal mine air and water pumping switching electro-hydraulic control system, air and water pumping electric control rapid opening and closing and rapid switching of different functions are achieved, the automation degree of air and water pumping switching is improved, and the air and water pumping switching time is shortened; and meanwhile, when dangerous working conditions that gas accumulation exceeds the limit due to hole blocking behind the drill hole or carbon monoxide gas appears in the drill hole and the like, rapid and automatic response processing can be achieved. The air and water pumping conversion efficiency is improved, the labor intensity of workers is relieved, and key technical support is provided for coal mine underground automatic drilling whole-process operation.

The invention relates to a high-precision hydraulic charging regulation and control method and system based on a PID and MPC combined algorithm, and the method comprises the steps: collecting a pulse pressure waveform borne by a pressure-bearing part under a target working condition, and collecting a corresponding relation between a control instruction of the opening degree of a regulating valve and the pulse pressure waveform, constructing a pulse pressure waveform library to update a target waveform of the target working condition; creating a state space model to update dynamic characteristics of the hydraulic charging system, dynamically optimizing pre-regulated first-step control input through an MPC algorithm according to the dynamic characteristics, and updating a real waveform tracking target waveform of prediction output in a rolling manner until prediction similarity meets a set threshold value of the target waveform; and in response to the condition that the predicted similarity meets a set threshold value, selecting a PID algorithm to perform feedback adjustment and dynamic compensation on the control input of the real waveform, and outputting target control input simulating the target waveform under the target working condition. The precision, efficiency and flexibility of regulation and control of the hydraulic filling system can be improved.

The invention discloses a deep sea underwater integrated electro-hydraulic actuator system adopting pump and valve combination. The deep sea underwater integrated electro-hydraulic actuator system comprises a hydraulic cylinder, a pump control assembly and a valve control assembly. The pump control assembly comprises a metering pump, a first switch valve and a second switch valve; the valve control assembly comprises a large-flow proportional valve, a small-flow proportional valve, a deep sea compensation energy accumulator and a third switch valve. The metering pump, the first switch valve and a rod cavity of the hydraulic cylinder are sequentially connected through a pipeline, the metering pump, the second switch valve and a rodless cavity of the hydraulic cylinder are sequentially connected through a pipeline, the metering pump, the third switch valve and the deep sea compensation energy accumulator are sequentially connected through a pipeline, and the rodless cavity of the hydraulic cylinder is connected with the large-flow proportional valve and the small-flow proportional valve through pipelines. Two control modes of the actuator can be completed, large-flow control is achieved through the pump control assembly, high efficiency and energy conservation are achieved, flow needed by maintenance is supplied to a rodless cavity of the actuator through the valve control assembly via the large-flow proportional valve and the small-flow proportional valve, and posture keeping and emergency action are achieved.

The invention discloses a multi-mode drilling process multi-dimensional parameter real-time while-drilling monitoring system, belongs to the technical field of while-drilling monitoring, and solves the problems that a monitoring system matched with an existing engineering driller is insufficient in transient feature capture, deficient in data timeliness and diversity, limited in application scene and low in data reliability under a strong vibration working condition. The system comprises a rock drilling subsystem, a hydraulic pump station auxiliary subsystem, a control subsystem and a data collecting and monitoring subsystem. According to the invention, millisecond-level real-time monitoring, data visualization and storage can be carried out on multi-dimensional parameters such as drilling stroke, pressure, flow, frequency, displacement, acceleration and the like in the while-drilling process. The system is high in integration level, quick in response, complete in data and high in adaptability, and reliability, effectiveness, comprehensiveness and timeliness of while-drilling data are remarkably improved.

The invention discloses an oil supply control system of a hydraulic pump station, and relates to the technical field of hydraulic systems. The oil supply control system of the hydraulic pump station comprises an oil tank; the oil inlet end of the oil supply pump communicates with the oil tank, and the oil outlet end of the oil supply pump is connected to the oil suction end of the variable plunger pump through an oil supply path; a heat exchanger and a filter are sequentially arranged in the oil supply path and used for conducting temperature adjustment and particle filtration on oil. The oil supply path is connected with a bypass pipeline in parallel, the bypass pipeline is communicated with the oil tank through a one-way valve, the opening pressure of the one-way valve is smaller than 2 bar, and the one-way valve is used for guaranteeing the positive pressure of the oil suction end of the variable pump. The oil outlet end of the variable displacement piston pump is connected to an external hydraulic system and is provided with a high-pressure filter; the detection device is arranged in the oil supply path and used for collecting oil temperature and / or pressure signals; and the control module is connected with the detection device and the execution components and is configured to control the start and stop states of the oil supply pump, the variable displacement piston pump and the heat exchanger according to the comparison result of the detection result and a preset threshold value.

The invention relates to the technical field of stackers, in particular to a rigid anti-swing device of a stacker for an automatic stereoscopic warehouse, which comprises the stacker, a first-stage moving platform and a second-stage moving platform arranged on one side of the stacker, an objective table arranged above the second-stage moving platform, a scissor-fork type connecting rod mechanism, a buffer mechanism and a protection mechanism, the scissors fork type connecting rod mechanism is connected between the first-stage moving platform and the second-stage moving platform of the stacking machine. The shear fork type connecting rod mechanism is additionally arranged between the first-stage moving platform and the second-stage moving platform, the relative motion between the two platforms is forced to be single and determined linear motion, the connecting rigidity in the transverse direction and the vertical direction is greatly enhanced, and therefore basic shaking caused by sudden acceleration change and structural elastic deformation is restrained.

Disclosed is a hydraulic control system for safe rapid opening or closing of a valve. The hydraulic control system comprises a hydraulic cylinder (71), a pressure oil line (141), an oil return line (151), an oil drain line (161), a quick oil return line (171) and a valve manifold (181), wherein the inside of the valve manifold is provided with a three-position four-way directional control valve (51), a bidirectional hydraulic lock (31), a first two-position four-way directional control valve (61) and an energy accumulator (191); a first cartridge valve (101) is connected between the oil drain line and a rod cavity of the hydraulic cylinder, and a pilot port of the first cartridge valve is connected to a port A of the first two-position four-way valve; an oil inlet of the energy accumulator is connected to each of the pressure oil line and the oil return line, a first check valve (81) is connected between the oil inlet of the energy accumulator and the pressure oil line, and a second cartridge valve (102) is connected between the first check valve and the energy accumulator; and the second cartridge valve is connected to a rodless cavity of the hydraulic cylinder, and a pilot port of the second cartridge valve is connected to the port A of the first two-position four-way directional control valve. The hydraulic control system for safe rapid opening or closing of a valve allows for safe rapid opening or closing of a valve.

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.

Disclosed herein are methods and systems for capturing a large collection of downhole fluid samples and, more particularly, disclosed are methods and systems for using at least two hydraulic pressure lines to alternatingly actuate hydraulic valves disposed in an interlinked series to obtain any large collection of hydraulically actuated components to be energized in sequence. A large collection of downhole fluid samples may be defined as any number of downhole fluid samples wherein the number of downhole fluid samples is larger than the number of actuators.

A constant-flow control valve group, an auxiliary arm control module, a complete hydraulic system, and a crane. The constant-flow control valve group comprises: a cartridge valve; a cartridge reversing valve, comprising a working oil port on one side and a main oil return port and a reversing valve oil inlet selectively connected to the working oil port on the other side, the working oil port being connected to a control oil port of the cartridge valve, and the reversing valve oil inlet being connected to a main oil inlet of the cartridge valve; and a feedback on-off valve, disposed in a working feedback oil path connected between the main oil inlet of the cartridge valve and a main feedback oil port of the constant-flow control valve group. The auxiliary arm control module comprises the constant-flow control valve group and a main reversing valve. The complete hydraulic system comprises the auxiliary arm control module and an auxiliary arm luffing cylinder, and may further comprise a load-sensitive oil pump and a main valve. The present application can achieve the effect of directly connecting an auxiliary arm hydraulic system to an existing complete hydraulic system as a sub-module without altering the original system.

The invention relates to the technical field of engineering machinery, and particularly discloses an electrically-driven metering pump load-sensitive system, a control method and engineering machinery, the electrically-driven metering pump load-sensitive system comprises a control unit, a driving motor assembly, a metering pump, a pilot hydraulic control unit, a pilot handle assembly, a load-sensitive valve assembly, an actuator assembly, a sensor assembly and a pressure difference control module; the driving motor drives the metering pump to supply oil to the load-sensitive valve assembly so as to drive the actuator assembly to operate; the control unit receives the maximum outlet pressure and the maximum load pressure of the pump collected by the pressure sensor, receives a system target pressure difference signal of the pressure difference control module at the same time, and synchronously controls the rotating speed of the motor and the valve target pressure difference output by the proportional pressure reducing valve. The system aims to solve the problems that a traditional upstream compensation load sensitive system lacks a flow saturation resisting function, and a downstream compensation load sensitive system has extra reversing energy consumption and fixed system pressure difference setting.

The utility model discloses a hydraulic walking control system and a high-altitude operation vehicle. The system comprises a walking pump, a first flow distributing and collecting valve, a second flow distributing and collecting valve and walking motors. A port A of the walking pump is connected with a third port of the first flow distributing and collecting valve and a third port of the second flow distributing and collecting valve, and a port B of the walking pump is connected with a port B of the left front walking motor, a port B of the left rear walking motor, a port A of the right front walking motor and a port A of the right rear walking motor. A fourth port of the first flow distributing and collecting valve is connected with a port A of a left front walking motor, and a second port of the first flow distributing and collecting valve is connected with a port A of a left rear walking motor; a fourth port of the second flow distributing and collecting valve is connected with a port B of the right front walking motor, and a second port of the second flow distributing and collecting valve is connected with a port B of the right rear walking motor. According to the utility model, the problem that the walking effect is influenced due to the change of flow and pressure caused by slipping during walking is avoided.

The invention discloses a double-acting integrated hydraulic nut and a hydraulic nut system. The double-acting integrated hydraulic nut comprises a cylinder body, a piston, a cylinder cover, a locking nut, an outer hexagon head bolt and a locking sleeve. A mounting plane attached to a workpiece is arranged at the bottom of the cylinder body, and the piston is arranged in an inner cavity of the cylinder body in an axial sliding mode. The outer hexagonal head bolt sequentially penetrates through the axial through hole of the piston and the bottom of the cylinder body, and the threaded end of the outer hexagonal head bolt is meshed with a workpiece in a threaded mode. The cylinder cover is arranged at the top of the cylinder body; the locking nut is in threaded connection with the piston rod and is in contact with the top surface of the cylinder cover; a pressurizing oil port connected with a hydraulic pump station is formed in the side wall of the cylinder body. The hexagonal head of the outer hexagonal head bolt is sleeved with the locking sleeve which is in driving connection with the electric wrench. Due to the fact that the bearing seat bolts are compact in layout and large in bolt pre-tightening force requirement, the experiment platform can be rapidly mounted and dismounted, and working time and cost are greatly reduced.

The invention discloses a pilot valve for hydraulic adjustment, and relates to the technical field of pilot valves, the pilot valve comprises a main valve sleeve assembly, an electromagnet assembly and a coil assembly which are assembled in sequence, the electromagnet assembly comprises a shell and a driving shaft, the driving shaft is assembled in the shell in a sliding mode, and the main valve sleeve assembly comprises an end cover, a main valve sleeve, a main valve element, a front valve element, a main spring seat and a pilot valve element. The main valve sleeve is fixedly installed in the shell, the end cover is in interference fit with the end, away from the shell, of the main valve sleeve, the main valve element is slidably assembled in the main valve sleeve, the front valve element is slidably assembled in the main valve element, the main spring seat is slidably assembled in the front valve element, and one end of the main spring seat movably penetrates through the front valve element to be in threaded connection with the end cover. A main elastic piece is assembled between the main spring seat and the front valve element, the pilot valve element is assembled between the main valve element and the driving shaft in a sliding mode and located on the moving path of the driving shaft, and a pilot elastic piece is assembled between the pilot valve element and the main valve element. Assembly is easy, machining difficulty is reduced, mass production is facilitated, and cost is reduced.

The present invention discloses a hydraulic brake valve and its exhaust process method. The valve body of the exhaust structure touches and presses the operating mechanism at the top of the valve body component of the valve body. A working spring is installed on the valve plug of the valve body. The valve core is installed in the central hole of the valve body and the central counterbore of the plug. The valve core is inserted into the center of the plug, and the counterbore presses the return spring. The return spring is installed on the spring seat, and the spring seat is installed in the counterbore of the plug. The roller of the operating mechanism touches and presses the plug in the valve body to form action and reaction forces, and promotes the operating mechanism and the valve core to touch and press and move to work. The valve core can slide along the inner wall of the valve body. An exhaust hole is provided on the side wall of the valve core. A plug for blocking the other end of the valve body is provided in the valve body, and a spring seat abutting against the plug is further provided in the plug. A return spring is installed between the spring seat and the valve core. The advantages are: avoiding abnormal noises and cavitation phenomena caused by gas accumulation to the hydraulic brake valve, ensuring the normal transmission and circulation of hydraulic oil in the pipeline, and eliminating potential hazards of the hydraulic braking system.

Low-pressure oil enters an inlet of a proportional overflow valve, the pressure of a low-pressure system is controlled by the proportional overflow valve, pressure oil on the low-pressure side acts on a plunger control cavity of the hydraulic control overflow valve through a pressure stabilizing damper and a one-way valve, and hydraulic pushing force generated by a plunger is transmitted to an overflow valve steel ball through a disc spring; when the force obtained by multiplying the ultrahigh pressure of the inlet of the hydraulic control overflow valve by the action area of the steel ball is equal to the pushing force of the plunger, the steel ball of the overflow valve is opened to start overflowing, and the overflow pressure of the ultrahigh pressure system can be controlled by adjusting the pressure of the proportional overflow valve of the low-pressure system. The external control type ultrahigh-pressure proportional pressure regulating valve can be used for pressure regulation of a hydraulic system with the pressure being 200 MPa or above and can be used as a proportional overflow valve of an ultrahigh-pressure hydraulic system. By arranging a hydraulic loop of two auxiliary oil ports of the external control type ultrahigh pressure proportional pressure regulating valve, the pressure rising one-way proportional regulating function, the pressure unloading function and the pressure rising / falling two-way proportional regulating function of an ultrahigh pressure system can be achieved.

An actuation assembly includes a control valve, a first actuator and a second actuator fluidly connected to the control valve via plumbing. The first actuator has a first extend port and the second actuator having a second extend port. A flow control device fluidly connected to the first actuator and the second actuator is operable to balance a flow rate of a fluid at the first actuator with the flow rate of the fluid at the second actuator. The flow control device is arranged within the plumbing, at a position between the control valve and the first extend port and the second extend port.

The invention discloses a multi-mode hydraulic system for synchronous pushing and splicing shield tunneling track deviation rectification. The multi-mode hydraulic system comprises a shield body, a pushing side hydraulic cylinder, a load side hydraulic cylinder, a counter-force plate and a follow-up supporting device. Six hydraulic cylinders are arranged on the propelling side and evenly distributed on the inner side of the shield body. The loading side is provided with four hydraulic cylinders which are uniformly distributed on the inner side of the shield body; the left sides of the ten hydraulic cylinders are connected with the shield body through hooke joints, and the right sides are connected with the counter-force plate through hooke joints; wherein a passive loading mode is adopted on the loading side; five propulsion system control loops are provided on the propulsion side, namely proportional pressure reducing valve control, proportional overflow valve and proportional speed regulating valve parallel control, proportional pressure reducing valve and proportional speed regulating valve load port independent control, proportional overflow valve and proportional speed regulating valve load port independent control and proportional speed regulating valve load port independent control. By the adoption of the technical scheme, various control requirements of pressure control and pressure flow compound control can be met.

The invention discloses an AGV portal motion speed control method and an AGV, and the method comprises the steps: receiving a portal motion speed instruction, and obtaining a needed portal motion speed in the portal motion speed instruction; based on the action speed of the portal frame, a speed-rotating speed formula is used for calculating the required rotating speed of the pump; if the required rotating speed is larger than or equal to the minimum rotating speed of the pump motor, the rotating speed of the pump motor is adjusted to the pump required rotating speed, the current corresponding to the opening degree of a multi-way valve port enabling the output flow allowed by the multi-way valve to be larger than the real-time output flow of the pump is calculated, and the opening degree of the multi-way valve port is controlled based on the current; otherwise, the rotating speed of the pump motor is adjusted to the minimum rotating speed, the current corresponding to the opening degree of the valve port of the multi-way valve enabling the output flow allowed by the multi-way valve to be smaller than the real-time output flow of the pump is calculated, and the opening degree of the valve port of the multi-way valve is controlled based on the current. According to the method, different flow control modes are selected based on the required rotating speed of the pump, the low-speed lifting micro-motion performance is optimized, the pressure loss generated by rapid lifting is reduced, and the energy consumption is reduced.

The utility model discloses an electrodialysis device with an automatic hydraulic station, and belongs to the field of electrodialysis devices. The hydraulic cylinder is connected with the electrodialysis assembly; an oil tank; one end of the pump body is communicated with the oil tank; the inlet end of the one-way valve is communicated with the other end of the pump body, and the outlet end of the one-way valve is communicated with the hydraulic cylinder; one end of the pressure sensor is communicated with the oil tank, and the other end of the pressure sensor is communicated between the outlet end of the one-way valve and the hydraulic cylinder; one end of the electromagnetic valve is communicated with the oil tank, and the other end of the electromagnetic valve is communicated between the outlet end of the one-way valve and the hydraulic cylinder; and the controller is electrically connected with the pressure sensor and the electromagnetic valve. The utility model has the technical effects that the pressure can be automatically controlled conveniently, and the pressure can be prevented from being too large or too small.

Disclosed in the present invention are a crane upper and lower structure interlocking system, and a crane. In the system, a third-stage pump of a hydraulic pump set is connected to an oil inlet P of an outrigger extension and retraction valve, and an extension and retraction switching valve in the outrigger extension and retraction valve is connected to the oil inlet P of the outrigger extension and retraction valve. A first working oil port and second working oil port of a locking valve are both connected to a fifth working oil port of the extension and retraction switching valve; a third working oil port of the locking valve is connected to a rod cavity of each of a horizontal oil cylinder, a vertical oil cylinder and a fifth outrigger oil cylinder; and a fourth working oil port of the locking valve is connected to a sixth working oil port of the extension and retraction switching valve. When a boom is in a non-stowed state, the locking valve is deenergized and operates in a right-hand position; at this moment, regardless of whether the extension and retraction switching valve is in an upper position or a lower position, an oil outlet thereof is directly connected to an oil return port through the locking valve to enable pressure unloading, and the horizontal oil cylinder, the vertical oil cylinder and the fifth outrigger oil cylinder remain motionless, thereby achieving locking. The present invention can achieve unloading of an oil inlet line when misoperation of an outrigger handle occurs during upper-structure operation, achieving the locking function against misoperation.

The invention belongs to the technical field of valves, and discloses a two-way proportional overflow valve which comprises a main valve sleeve, a pilot valve sleeve assembly, a main valve element, an elastic assembly, a pilot valve element and an electromagnetic assembly, a first oil port, a second oil port and an oil discharge port are formed in the main valve sleeve, and a first cavity is formed between the main valve element and the pilot valve sleeve assembly; the main valve element is provided with a first damping channel communicating with the first oil port and the first cavity and a second damping channel communicating with the second oil port and the first cavity, a first plugging piece is arranged in the first damping channel and used for enabling a medium to flow to the first cavity from the first oil port in a one-way mode, and a second plugging piece is arranged in the second damping channel and used for enabling the medium to flow to the second cavity from the second oil port in a one-way mode. And the second plugging piece is used for enabling the medium to unidirectionally flow to the first cavity from the second oil port. The two-way proportional overflow valve can replace the integrated state of two groups of overflow valves, space and cost are saved, reverse cut-off of the other damping channel can be achieved on the basis that overflow is completed through one damping channel, and normal work of the overflow valve is guaranteed.

A winch hydraulic control system includes a hydraulic oil tank, a hydraulic pump, and an electric motor. The hydraulic pump's oil inlet is connected to the hydraulic oil tank, the electric motor is connected to the hydraulic pump, and the hydraulic pump's oil outlet is connected to both port P of the main reversing valve assembly and port P of the control valve assembly. Ports A and B of the main reversing valve assembly are connected to port A of the first shuttle valve, port A of the balancing valve assembly, and port B of the control valve assembly, respectively. Port X is connected to port B of the second solenoid reversing valve. Ports B and C of the first shuttle valve are connected to port B of the balancing valve assembly and port B of the second shuttle valve, respectively. A third pressure reducing valve is connected in parallel with the second solenoid valve. Port P of the second solenoid reversing valve is connected to port X of the control valve assembly, port A of the second shuttle valve, and port SP of the balancing valve assembly. Port C of the second shuttle valve is connected to the rod chamber of the brake. The brake is connected to the hydraulic motor, and the oil outlet of the control valve assembly is connected to the oil inlet of the balancing valve assembly. This design can maintain constant wire rope tension and stable operation.

The present invention provides a hydraulic valve control method, system and device to flexibly, quickly and simply implement hydraulic valve control. The above-mentioned hydraulic control device includes a controller and a hydraulic valve. The method includes: the controller loads a modular program; wherein, the modular program at least includes: at least one general function module, the call sequence of each general function module, the input-output relationship between general function modules, and the connection relationship between the interface of the hydraulic valve and the general function module; each general function module encapsulates multiple functions; each general function module provides at least one pin externally; the pin internally encapsulates the definition of multiple variables and the function operation on the variables; the input-output relationship includes: the connection relationship of pins between modules; the controller executes each general function module in the modular program according to the call sequence, input-output relationship and connection relationship to perform data interaction with the corresponding interface of the hydraulic valve.

The invention provides a three-order hydraulic servo position control system active-disturbance-rejection control method based on friction compensation, and relates to the technical field of fluid transmission and control, and the method comprises the steps: S1, building a state space model of a three-order hydraulic servo position control system, building a linear expansion state observer, and obtaining a linear active-disturbance-rejection controller of the three-order hydraulic servo position control system; s2, nonlinear time-varying disturbance compensated by the third-order hydraulic servo position control system is converted into a tracking error compensation item controlled by a friction compensation algorithm; s3, verifying the stability of the closed-loop third-order hydraulic servo bit control system through error convergence before and after feed-forward compensation; and S4, the control voltage of the third-order hydraulic servo position control system is input, and nonlinear friction feedforward compensation control of the third-order hydraulic servo position control system is achieved. According to the method, a model-free control strategy is adopted, an innovative solution path is provided for friction suppression and self-adaptive friction compensation, and the control precision and robustness of the hydraulic servo system are improved.