8839results about "Fluid-pressure actuator components" patented technology

The invention relates to a compressed air supply system (100) for a sensor cleaning device (301) with a compressed air connection (1), a compressed air supply connection (2), a pneumatic main line (12) from the compressed air connection (1) to the compressed air supply connection (2) and an air dryer (5, 5.1) arranged in the pneumatic main line (12) for drying the compressed air (120). The invention proposes a water separator (6) arranged in the main line (12) between the compressed air connection (1) and the air dryer (5, 5.1) and a branch line (14, 14.1, 14.2) extending from the pneumatic main line (12) between the water separator (6) and the air dryer (5, 5.1) and reconnecting between the air dryer (5, 5.1, 5.2) and the compressed air supply connection (2), which has a pneumatic branch line switching valve (24, 24.1, 24.2) which in a first operating mode (B1) controls the branch line (14, 14.1, 14.2).2) opens pneumatically in the direction of the compressed air supply connection (2), and the compressed air supply system (100) is configured in the first operating mode (B1) to allow compressed air (141) to return from the branch line (14, 14.1, 14.2). The invention further relates to a compressed air supply system (1200), a vehicle (1000) and a method (2000) for operating a compressed air supply system (1200).

The invention discloses a seeding monomer seeding depth and suppression control method and a control device thereof.The method comprises the steps that control parameter data are obtained, and the control parameter data comprise a seeding mode and / or suppression / pressing parameters; determining an operation mode based on the control parameter data; when the operation mode is a downward pressing mode and a pressing mode, a pressing hydraulic cylinder and a downward pressing hydraulic cylinder are adjusted to stretch and retract in real time based on data collected by a pressing force sensor and data collected by a downward pressing force sensor, so that target pressing force and target downward pressing force are kept; and when the operation mode is a pressing / pressing cooperation mode, data collected by the pressing force sensor and the pressing force sensor are obtained at the same time, and the pressing hydraulic cylinder and the pressing hydraulic cylinder stretch out and draw back at the same time, so that the target pressing force and the target pressing force are kept. According to the scheme, on-demand switching of the pressing mode, the pressing mode and the pressing / pressing cooperation mode can be achieved, and compared with a fixed mode in the prior art, higher adaptability and flexibility are achieved.

The invention relates to a control method (2000, 4000, 5000) for a compressed air supply system (1200) to which a control device (1300) is assigned, comprising the steps: - Receipt (2100) of a supply requirement (Bv) by the control unit (1300), - Controlling (2200) a compressed air transmitter (200) by the control unit (1300) to supply compressed air (110) at a compressed air connection (1) when the control unit (1300) receives a supply requirement (Bv), - Determine (2300) a freezing risk (R I ) by the control unit (1300) depending on environmental information (I U ) and / or an operating status information (I B ) of the compressed air transmitter (200), - Actuation (2400) of a main line switching valve (25) by the control unit (1300) to block the pneumatic main line (12) in a first operating mode (B1), in the event that the risk of freezing (R I ) below a predefined limit (W), - Guiding (2500) compressed air (141) through the branch line (14, 14.1, 14.2) to the compressed air supply connection (2) in the filling direction (B) in the first operating mode (B1) to supply the compressed air consumer (300). The invention further relates to a control device for carrying out the method and a vehicle with such a control device.

The invention relates to a control method (2000, 3000, 4000) for a compressed air supply system (1200) to which a control device (1300) is assigned, comprising the steps: - Receipt (2100) of a supply requirement (Bv) by the control unit (1300), - Controlling (2200) a compressed air transmitter (200) by the control unit (1300) to supply compressed air (110) at a compressed air connection (1) when the control unit (1300) receives a supply requirement (Bv), - Identify (2300) a regeneration execution time (B R ) by the control unit (1300) depending on the supply requirement (B V ) and / or a saturation level (G) of an air dryer (5, 5.1), - Actuation (2400) of a switching valve (24, 24.1, 24.2) by the control unit (1300) to open a branch line (14, 14.1, 14.2) when the control unit (1300) has a regeneration execution time (B R) identified, - Return (2500) compressed air (141) from the branch line (14, 14.1, 14.2) against a filling direction (B) through a pneumatic main line (12) for regenerating the air dryer (5, 5.1). The invention further relates to a control device for carrying out the method and a vehicle with such a control device.

The invention relates to a method (2000, 2000') for operating a pneumatic system (1200), comprising the steps: - Providing (2100) compressed air (120), - Routing (2200) the compressed air (120) via at least one first pneumatic line (10) to a compressed air supply connection (2), - Routing (2300) the compressed air (120) from the compressed air supply connection (2) via at least one second pneumatic line (316) of a connected pneumatic system (300), - Energizing (2420) at least one pneumatic solenoid valve (20) selectively with a heating control current (S I2 ) to heat at least one of the pneumatic solenoid valves (20), and - Energize (2430) at least one of the pneumatic solenoid valves (20) with a deflection control current (S I1 ), which is greater than the heating control current (S I2) is to be deflected from a basic position (G). The invention further relates to a corresponding pneumatic system (1200), a compressed air supply system (100) and a pneumatic system (300) for a pneumatic system (1200) and a vehicle with a pneumatic system (1200).

The invention relates to a compressed air supply system (100) with a pneumatic main line (12) from the compressed air connection (1) to the compressed air supply connection (2), and an air dryer (5, 5.1) arranged therein for drying the compressed air (120). The invention proposes a branch line (14, 14.1, 14.2) extending from the pneumatic main line (12) between the compressed air connection (1) and the air dryer (5, 5.1, 5.2) and reconnecting between the air dryer (5, 5.1, 5.2) and the compressed air supply connection (2), and a main line switching valve (25) arranged upstream of the branch line (14, 14.1, 14.2), between the compressed air connection (1) and the air dryer (5, 5.1), which in a first operating mode (B1) closes the pneumatic main line (12). The invention further relates to an operating method (2000), a vehicle (1000) and a compressed air supply system (1200) with a compressed air supply system (100).

The invention discloses a hydraulic system throttling control method based on a hydraulic control one-way valve, which relates to the technical field of throttling control, and comprises the following steps of: in an initialization stage of starting a hydraulic system, setting an optimal initial throttling opening for a throttling valve based on flow data of current oil; the method comprises the following steps: performing high-frequency real-time acquisition on flow state data of oil through a sensor deployed at the upstream of a throttling area, and establishing a set of flow state data system based on a time sequence; continuously collected flow state data are divided according to time windows, and an analysis set of oil flow data is constructed. According to the method, the dynamic flowing state of oil is monitored and deeply analyzed in real time, the load state is intelligently predicted in combination with a support vector machine model, and the opening degree of the throttling valve is adjusted in real time; the problems that in the prior art, response of a throttling control strategy to a high-load working condition is delayed, and oil temperature rise and viscosity abnormal reduction are caused by serious local pressure loss of a throttling area are effectively solved.

The invention relates to a split type electro-hydraulic direct-driven non-retractable fin stabilizer hydraulic system which comprises a hydraulic unit and an actuating mechanism which are independently arranged, and the actuating mechanism comprises fin rotating oil cylinders which are symmetrically arranged; a bidirectional hydraulic pump driven by a servo motor forms a closed fin rotating loop; the bidirectional hydraulic pump driven by the servo motor, the hydraulic unit and the actuating mechanism form an electro-hydraulic direct-drive fin stabilizer device; the control loop is composed of a gyroscope, a controller and an executing mechanism, and the gyroscope detects the rolling angular velocity of the ship and generates a fin rotating instruction signal; the controller compares the instruction signal with the fin angle feedback signal and outputs a servo motor rotating speed instruction; the servo driver controls the servo motor to rotate forwards and backwards, the bidirectional hydraulic pump is driven to adjust the displacement of the fin rotating oil cylinder, and therefore the fin is driven to rotate. A valve control or pump control type hydraulic system adopted by a traditional fin stabilizer is replaced, integrated optimization, light weight, high efficiency, high reliability and low noise of the fin stabilizer hydraulic system are achieved, and the occupied space of equipment is reduced.

The invention discloses an automatic air cylinder clamping system and method, and belongs to the technical field of air cylinder clamping, and the system comprises a map drawing module which is used for drawing a three-dimensional clamping force distribution map; the risk prediction module is used for synchronously predicting a deformation deviation risk value in the clamping process; the model calculation module is used for generating a dynamic attenuation coefficient; and the air cylinder adjusting module is used for dynamically adjusting the opening degree of a multi-stage cushion valve and the servo pressurization rate of the automatic air cylinder set through a self-adaptive control strategy till the clamping force error is stabilized within a preset threshold value. The technical problems that in the automatic air cylinder clamping process, due to environment interference and system errors, the clamping force is unstable, and the workpiece clamping precision is low are solved, and the technical effects that the clamping force stability is improved through dynamic compensation and self-adaptive adjustment, the deformation risk is reduced, and the clamping precision is improved are achieved.

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 utility model relates to the technical field of hydraulic stations, and discloses an automatic temperature control system for a hydraulic station, which comprises an air-cooled radiator for radiating hydraulic oil, an oil inlet pipe and an oil outlet pipe for connecting the air-cooled radiator with the hydraulic station, a controller, a temperature sensor A, a temperature sensor B and an alarm, the temperature sensor monitors the temperature of hydraulic oil entering and exiting the air-cooled radiator in real time, and the controller adjusts the heat dissipation effect of the air-cooled radiator according to monitored data so as to maintain the oil temperature within a suitable range. And if the oil temperature exceeds a set threshold value, the controller can activate the alarm to prompt an operator to intervene. The system can monitor the oil temperature in real time and quickly respond to temperature changes, and it is guaranteed that the performance of hydraulic oil is in the optimal state all the time.

The invention belongs to the field of aviation equipment, and discloses an electric pump control method and system based on a protection mechanism, and the control method comprises the steps: collecting an onboard state signal, a flight control system state signal and the hydraulic pressure of each sub hydraulic system in a hydraulic system in real time; according to the onboard state signal, an electric pump closing instruction and a hydraulic pressure logic judgment instruction are output through first electric pump control logic, and an electric pump connected to the sub hydraulic system is closed according to the electric pump closing instruction; a flight control system state signal and hydraulic pressure are obtained according to the hydraulic pressure logic judgment instruction, and an electric pump connected to each hydraulic sub-system is automatically controlled through second electric pump control logic and electric pump protection logic. By designing the automatic electric pump control logic and the electric pump protection logic, the electric pump damage caused by excessive transient current due to simultaneous starting of all the electric pumps can be avoided, and the flight safety is improved.

The invention belongs to the field of hydraulic transmission system design, and discloses a hydraulic transmission system protection method and system.The protection method comprises the steps that onboard state signals, flight control system state signals and first hydraulic pressure and second hydraulic pressure of each hydraulic pipeline in a hydraulic transmission system are collected in real time; according to the onboard state signal, an electric pump closing instruction and a hydraulic pressure logic judgment instruction are output through an onboard state threshold value and first electric pump control logic, and an electric pump connected to a hydraulic pipeline is closed according to the electric pump closing instruction; and acquiring a flight control system state signal, first hydraulic pressure and second hydraulic pressure according to the hydraulic pressure logic judgment instruction, and automatically controlling the electric pump by adopting a second electric pump control mechanism and a hydraulic pipeline protection mechanism through a low-pressure threshold value and a pressure safety threshold value. According to the invention, the starting of each electric pump can be automatically controlled, a hydraulic passage can be protected through a plurality of mechanisms, and the flight safety can be improved.

The invention belongs to the field of electromechanical control, and discloses a redundancy control method and system for an electric pump and a transmission system.The redundancy control method comprises the steps that onboard state signals, flight control system state signals and first hydraulic pressure and second hydraulic pressure of each hydraulic sub-system in a hydraulic system are collected in real time; an electric pump closing instruction and a hydraulic pressure logic judgment instruction are output through an on-board state threshold value and first electric pump control logic according to the on-board state signal, and the electric pump is closed according to the electric pump closing instruction; and a flight control system state signal, the first hydraulic pressure and the second hydraulic pressure are obtained, and each electric pump is automatically controlled through a low-pressure threshold value and a pressure safety threshold value by adopting second electric pump control logic, a hydraulic pipeline protection mechanism and an electric pump protection mechanism. According to the invention, the starting of each electric pump can be automatically controlled, a hydraulic passage can be protected, and the flight safety is ensured.

The invention discloses a multi-cylinder hydraulic equipment data interaction system based on digital twin drive, and relates to the technical field of industrial automation control. The problems that in the prior art, data acquisition and processing lack flexibility and pertinence, model construction and optimization are not perfect enough, and simulation optimization and real-time feedback are lacked are solved. Accurate perception and fault early warning of the equipment state are realized by optimizing the sensor layout and adjusting the acquisition frequency, the physical structure and the working principle of the equipment are accurately described by adopting a digital twin model, and the current and future running states of the equipment are scientifically evaluated and effectively predicted in combination with an evaluation index system of a state analysis unit. A basis is provided for advanced maintenance, the equipment fault risk is reduced, a digital twin model is used for simulating the implementation effect of a control strategy, a control instruction is optimized according to simulation evaluation, the execution effect is monitored in real time for dynamic adjustment, accurate control over equipment is ensured, the stability and reliability of equipment operation are improved, and the production efficiency is improved.

The invention designs a linear heave compensation device based on a composite cylinder, belongs to the technical field of ocean engineering equipment, adopts a heave compensation scheme of a double-composite-cylinder structure comprising a heave compensation execution cylinder and an integrated control cylinder, and is provided with a plurality of functional cavities; the working gas cylinder group is communicated with a rod cavity of the heave compensation execution cylinder through the gas-liquid converter to provide passive compensation force for the heave compensation execution cylinder; oil is alternately supplied to inner cavities of the two composite cylinders in a control mode of direct driving of the two-way variable pump, and active compensation force is provided for the heave compensation execution cylinder; for an underwater high-pressure environment, deepwater pressure acts on a piston rod of the integrated control cylinder and a piston rod of the heave compensation execution cylinder at the same time, and the water depth compensation function is achieved through offset of internal pressure of the double cylinders. Multiple functions such as passive compensation, active compensation and water depth compensation are achieved, multiple working condition operations such as water, splash zone passing and landing can be continuously completed, the two-way variable pump is adopted to directly drive the compensation execution cylinder, the response speed and the control precision are improved, and the beneficial effects of being low in energy consumption, compact in structure, integrated in multiple functions and the like are achieved.

The invention relates to the technical field of hydraulic servo control systems, and discloses a high-precision hydraulic servo control system and a fault diagnosis method thereof.The hydraulic servo control system comprises a system control module, a hydraulic execution module, a data feedback module, an automatic compensation module and a feedback control module; the system control module is used for receiving and processing an input signal and outputting a control instruction; the hydraulic execution module is used for generating a corresponding hydraulic action according to the control instruction; the data feedback module is used for detecting the actual position and pressure of the hydraulic execution module and transmitting a feedback signal to the automatic compensation module; the automatic compensation module is used for eliminating system errors through a compensation algorithm; the feedback control module is used for comparing the difference between the system output and a set target, generating a deviation signal, and adjusting the input of the system by using the signal, so that the system output is closer to the set target; through the system, the control precision and stability of the hydraulic servo control system can be improved.

The invention discloses a control method of a flap unloading platform, which is applied to a hydraulic control system of the flap unloading platform, and comprises the following steps: acquiring a starting signal, and enabling a power driving branch based on the starting signal; the system pressure of a hydraulic control system of the turning plate unloading platform is controlled by the power driving branch to be gradually increased; in response to the fact that the system pressure is equal to the preset value, the power-on state of the main electromagnetic valve is changed, the first proportional throttle valve and the second proportional throttle valve are adjusted based on the second working state of the main electromagnetic valve, the first lifting oil cylinder and the second lifting oil cylinder are controlled to act, and the turning plate unloading platform is driven to rotate; and in response to rotation of the flap unloading platform to the preset angle, the power-on state of the main electromagnetic valve is changed, so that the flap unloading platform is controlled to stop rotating based on the first working state of the main electromagnetic valve. By controlling the first proportional throttle valve and the second proportional throttle valve which are independent, independent control over the first lifting oil cylinder and the second lifting oil cylinder is achieved so that synchronous action can be achieved.

The invention relates to the technical field of deep sea power equipment, and discloses a pressure energy reciprocating power device and an action control method thereof.The pressure energy reciprocating power device comprises a sealing piston cylinder, a pressure-resistant pipe and an underwater control part; the sealing piston cylinder comprises a cylinder body and a piston rod arranged in the cylinder body, the piston rod comprises a piston and a push rod, one end of the push rod is connected with the piston, the other end of the push rod penetrates through the cylinder body in a sealing and sliding mode, and the piston divides the cylinder body into a rod cavity and a rodless cavity. The pressure-resistant pipe comprises a main pipeline, a first branch pipeline and a second branch pipeline, one end of the main pipeline is communicated with the rodless cavity, the other end of the main pipeline is communicated with the first branch pipeline and the second branch pipeline, and the first branch pipeline and the second branch pipeline are communicated with the outside and the pressure-resistant storage cylinder respectively; the underwater control piece is arranged on the pressure-resistant pipe and used for controlling the two branch pipelines to be alternately connected and disconnected so as to drive the push rod to stretch out or retract back and forth. Stable power output is obtained through energy conversion, and the device is simple in structure, easy to implement, safe and reliable.

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 provides an intelligent assembly type high-speed rail pier top support maintenance construction hydraulic control method and system, and relates to the technical field of hydraulic control. The method comprises the steps that historical construction data of a plurality of historical time periods are obtained; acquiring historical environment data of a plurality of historical time periods; according to the historical environment data, the historical hydraulic pressure, the historical beam body lifting height, the historical beam body weight and the historical hydraulic pump parameters, a hydraulic pressure magnitude relation function is determined; acquiring weather forecast information, beam body data and hydraulic pump parameters of the current time period; and determining the hydraulic pressure of the current time period according to the hydraulic pressure relation function, the weather forecast information, the beam body data and the hydraulic pump parameters. According to the method, the influence of environmental factors on the maintenance construction effect can be effectively reduced, and the accuracy and objectivity of a hydraulic magnitude control result are improved.

The invention discloses a fault diagnosis method of a hydraulic system and an intelligent early warning device, and relates to the technical field of hydraulic systems.The fault diagnosis method comprises the steps that an operation model of the hydraulic system is established according to ideal environment parameters, and standard operation parameters are imported into the operation model to obtain ideal performance coefficients of the hydraulic system; calculating an equipment operation deviation coefficient according to the ideal environment parameters, presetting a system operation early warning threshold value according to the equipment operation deviation coefficient, establishing an environment prediction model, integrating multiple groups of predicted environment change data to obtain an environment deviation oscillogram, and further delimiting a normal monitoring time period, a peak monitoring time period and a key monitoring time period; a corresponding monitoring frequency band is set, early warning judgment is performed according to a deviation value of an actual performance coefficient and an ideal performance coefficient of equipment, and fault prediction is realized before the hydraulic system breaks down due to interference of environmental factors in combination with interference influence of the environmental factors on operation of the hydraulic system. Economic losses caused by the fact that problems can only be found after faults occur are avoided.

The invention relates to the technical field of hydraulic transmission, and provides a variable-speed variable-displacement electro-hydraulic power source control method and a hydraulic system.The method comprises the specific steps that the system pressure and the system flow at the current moment are obtained; the initial rotating speed of the servo motor at the current moment is detected, and the initial displacement of the two-way variable pump at the current moment is obtained; a genetic algorithm is used for obtaining the optimal displacement of the two-way variable pump and the optimal rotating speed of the servo motor; the servo motor is adjusted according to the optimal rotating speed of the servo motor, so that the two-way variable pump works at the combination point of the optimal displacement and the optimal rotating speed; and during the working period of the two-way variable pump, the steps are cyclically executed to realize real-time regulation and control of the electro-hydraulic power source. According to the method, the efficiency model and the dynamic response model of the electro-hydraulic power source are established, the intelligent optimization algorithm is used for conducting multi-target dynamic optimization on the efficiency and the response time of the electro-hydraulic power source, the rotating speed of the servo motor and the displacement of the two-way variable pump are controlled in a coordinated mode, and the electro-hydraulic power source works in a high-efficiency and high-response area.

The invention discloses a closed monitoring control system for a hydraulic motor. The closed monitoring control system comprises the hydraulic motor, a main pump, an oil tank, a control loop and a monitoring module, the main pump is suitable for pumping oil in the oil tank to the hydraulic motor so that the hydraulic motor can convert hydraulic energy into mechanical energy to be output. The monitoring module is suitable for detecting the working state of the hydraulic motor, and the control loop is suitable for controlling the displacement of the main pump according to the detection result of the monitoring module. The control method has the beneficial effects that the working state of the hydraulic motor is detected, and the working state of the main pump is controlled according to the detection result, so that when the hydraulic motor is abnormal, the output rotating speed of the hydraulic motor can be reduced in time or the hydraulic motor is directly shut down, and the operation safety of the hydraulic motor can be effectively guaranteed.

The invention discloses a double-variable power source hydraulic system of a movable arm of an electric loader and a control method, and belongs to the technical field of energy conservation of electric engineering machinery. The hydraulic system is structurally characterized in that a permanent magnet synchronous servo motor and an electro-hydraulic proportional variable device form a double-variable power source direct drive arm hydraulic cylinder; the one-way valve achieves oil cylinder and motor oil supplementing and flow reappearing functions according to the working condition of a hydraulic cylinder, the direct-acting overflow valve achieves overflow protection of a hydraulic system, and the two-position two-way electromagnetic directional valve achieves the pressure maintaining function of the hydraulic cylinder. According to the control method of the hydraulic system configuration, an upper computer outputs a target instruction to a double-variable parameter optimization controller, then the double-variable parameter optimization controller outputs an optimization rotating speed or displacement signal to a motor pump set, and a pump outlet pressure sensor feeds back a pressure signal to achieve a pressure closed loop. The energy recovery function can be effectively achieved in the aspect of configuration, the energy efficiency characteristic of a power source can be greatly improved in the aspect of a control method, and the endurance time of the electric loader is effectively prolonged.

The invention belongs to the field of airborne electromechanics, and discloses a hydraulic mechanism heterogeneous control method and system.The method comprises the steps that hydraulic systems are divided into two groups, and on-board state signals, flight control system state signals and first hydraulic pressure and second hydraulic pressure of sub hydraulic systems are collected; giving an on-board state threshold value, a low-pressure threshold value, a hydraulic safety threshold value and a sub-hydraulic system relation table; starting and stopping automatic control is conducted on the electric pumps in the first group through the established first control logic architecture according to the data; and the electric pumps in the second group are automatically controlled to start and stop by adopting the constructed second control logic architecture through the data. The system comprises a grouping module, a control logic construction module and two control units, wherein each control unit comprises an acquisition module, a data scheduling module, a staggered starting module, an anti-overvoltage protection module and an anti-error working module. All the electric pumps are controlled through two heterogeneous logic architectures, and the control precision and safety are improved.

The invention discloses a control method and device of a hydraulic synchronous lifting device, a computer program and a storage medium, belongs to the technical field of ship manufacturing, and particularly relates to a control method of a hydraulic synchronous lifting device for ship assembly. In order to solve the problems of low synchronization precision, slow dynamic response, insufficient error compensation, poor environmental adaptability and the like of the existing control method of the hydraulic synchronous lifting device, the invention provides the control method of the hydraulic synchronous lifting device, which comprises the following steps of: acquiring a target height, a maximum inclination angle, a maximum deviation and a preset proportional valve opening; the actual heights of the four main jacking oil cylinders are obtained in real time, the average value and the inclination angle are calculated, whether the target height is reached or the maximum inclination angle is exceeded is judged, if not, the deviation of each oil cylinder is calculated, and the opening degree of the corresponding proportional valve is adjusted when the deviation is exceeded, and synchronous lifting is ensured. The device is suitable for the fields of ship building and maintenance, in-place and leveling of bridge precast beam bodies and extremely high requirements for lifting precision and safety.

The invention belongs to the field of aviation technology undercarriage design, and relates to an energy conversion valve used for an undercarriage folding and unfolding system. When the main system works normally, the pilot electromagnetic valve in the energy conversion valve is not electrified, the energy conversion valve is located at the working position of the main system, at the moment, the load subsystem communicates with the main system and isolates the standby system, and the landing gear cabin door / landing gear actuator cylinder is normally retracted and released; when the main system breaks down, the standby system supplies pressure, a pilot electromagnetic valve of the energy conversion valve is powered on, the load subsystem communicates with the standby system, the main system is isolated, and an undercarriage cabin door / undercarriage actuator cylinder is released emergently. The two positions of the valve element are reliably isolated, and a single function fault is not leaked to another system.

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.