32results about How to "Increase control flexibility" patented technology

This disclosure relates to a device grouping method, apparatus, electronic device, and storage medium. The method includes obtaining at least one first received signal strength corresponding to at least one device; performing clustering processing on at least one device based on the at least one first received signal strength corresponding to at least one device to obtain a first clustering result; dividing at least one device into at least one spatial group based on the first clustering result; and grouping the devices in each spatial group according to device type to obtain at least one device type group corresponding to each spatial group. This method allows for grouping devices based on the space in which they are located, enabling unified control of devices within the same space, greatly improving device control efficiency and flexibility, and thus enhancing the device control experience.

The invention provides a fan temperature-sensing frequency conversion control method and system for flexible production of an aluminum-silicon alloy electrolytic cell. The fan temperature-sensing frequency conversion control method comprises the steps that preset control parameters related to flexible production of the aluminum-silicon alloy electrolytic cell are obtained; temperature parameters during flexible production of the aluminum-silicon alloy electrolytic cell are collected; according to the collected temperature parameters, reference temperature parameters in the control parameters, reference frequency parameters in the control parameters and a preset control strategy, the target frequency of the draught fan is calculated; and on the basis of the target frequency, a frequency converter connected with a fan motor is controlled to operate, accurate and dynamic matching of the air volume of the fan and the production working condition is achieved, the energy consumption of the fan is reduced, and the control flexibility is improved.

The invention relates to the technical field of electric energy routers, in particular to a power distribution area flexible mutual aid system based on an electric energy router, and the system is characterized in that a DC bus in a flexible mutual aid device is connected with an external power distribution area through a plurality of bidirectional DC / AC ports, and is used for completing electrical coupling and power intercommunication; the plurality of bidirectional DC / AC ports are connected with the direct current bus in parallel, the direct current bus is connected with an energy storage port and a photovoltaic port, the energy storage port is communicated with an external energy storage device, the photovoltaic port is communicated with an external photovoltaic device, and the flexible mutual aid device is communicated with an external power grid dispatching through a controller. According to the invention, normalized flexible interconnection between feeder lines is realized through the flexible mutual aid device, potential safety hazards caused by frequent displacement of a conventional switch based on an interconnection switch are avoided, the control flexibility and rapidity of the power distribution network are improved, and the power distribution network has the advantages of open-loop operation and closed-loop operation at the same time.

The application discloses a paper-based and pulp molded product strong water-based structure resin composition for constructing a fiber matrix, a kit and a preparation and application method thereof, and belongs to the technical field of papermaking wet end chemistry and pulp molding materials. In response to the global trend of replacing plastic with paper and fluorine-free control of food contact materials, the application aims at the pain point of failure of traditional chemicals in a high recycling pulp proportion and a closed water circulation high conductivity system, and constructs an acrylic polycarboxylic acid polymer and inorganic-organic dual charge buffer synergistic system. The scheme realizes the multiplication effect of physical strength such as breaking and ring pressure and the water resistance and oil resistance barrier performance by a unique crosslinking mechanism at a very low dosage, which is better than conventional enhancement technology on the market. The composition is a full water-based system and does not contain perfluorinated compounds, which ensures complete pulp recycling while giving the product excellent wet stiffness and film-forming density, and provides a green solution with high efficiency, low cost advantage and compliance for the papermaking and pulp molding industry.

The utility model relates to electric heating furnace technical field discloses a kind of discharging mechanism for electric heating furnace, including support frame, drive mechanism, conveyer belt and infrared thermometer, support frame is made of high-temperature-resistant alloy steel, the shock-absorbing foot pad is installed in support frame bottom;Drive mechanism includes servo motor, the reducer connected with the output end of servo motor, several rotating rollers driven by reducer, several rotating rollers surface are coated with high friction coefficient rubber layer;Conveyer belt is driven to run by rotating roller, support frame is made of high-temperature-resistant alloy steel, and the shock-absorbing foot pad of high-temperature-resistant silicon rubber material is installed in bottom, it is equipped with disc spring array inside, can adapt to high-temperature environment and absorb vibration, prolong equipment service life.Multiple layers of heat insulation board are embedded with electric heating wire, and electric heating wire is embedded between aerogel thermal insulation layer and silicon carbide ceramic plate in serpentine arrangement mode, which helps to improve heating efficiency and ensure the uniformity of heating.

The application discloses a kind of heddle for textile machine, it is related to textile accessory technical field, including positioning column, cylindrical shaft, setting on the cylindrical shaft sheet pressing mechanism and hanging yarn mechanism and setting on the protection mechanism of positioning column, sheet pressing mechanism includes slide, press-in ring and card frame, press-in ring is circular table structure, and it is internally hollow, cylindrical shaft side wall is equipped with two slides, two slides are respectively movably connected with two slide ways, and the other end of two slides is connected with the inner side wall of press-in ring, four card frames are symmetrically arranged along the outer side wall of press-in ring, hanging yarn mechanism includes shaft, first branch, second branch and rotating column, two shafts are respectively arranged in two slide ways, and located at the side away from positioning column, in the application, steel ball bowl is rotatably and slidably connected with positioning column, which facilitates unwinding process, the internal snap ring can ensure that positioning column is in stable rotation and sliding process, and the shaft sleeve protects the screw connection part of helical rod and ratchet wheel.

The application provides a power distribution network peak regulation random optimization method considering three-phase imbalance, and belongs to the technical field of power distribution network control. The method comprises the following steps: establishing a new energy power prediction error probability distribution model, generating a power scene for obtaining possible error values of new energy power, and reducing the power scene; establishing a three-phase power distribution network peak regulation optimization model based on feeder load power control; and simplifying and solving the peak regulation optimization model. The application utilizes feeder load power control technology to coordinate various voltage regulation devices to complete feeder load power control, and comprehensively solves the system peak regulation and imbalance treatment problems. The application focuses on the scene of single-phase access of high-proportion new energy, establishes a multi-objective optimization model based on reactive power voltage control, utilizes feeder load power control technology to reduce the system peak-valley difference in peak-valley time periods, utilizes load regulation characteristics and split-phase voltage optimization to relieve system imbalance in non-peak-valley time periods, and reduces the system peak-valley difference and negative sequence voltage.

A load-adjustable multi-actuator electro-hydraulic control experiment table belongs to the technical field of fluid hydraulics. The experiment table comprises a hydraulic pump station, an aluminum profile frame, an extensible valve group, a plurality of hydraulic actuating elements and a load device. The extensible valve group is installed on the aluminum profile frame and comprises one basic valve block and N parallel extension valve blocks, each of which is integrated with five two-position two-way electro-hydraulic proportional valves, four of which constitute a liquid resistance full-bridge main control loop, and the fifth one is connected in parallel between the first and second working oil ports as a bypass valve. The plurality of hydraulic actuating elements are installed on the aluminum profile frame and are in fluid communication with the corresponding extension valve blocks through working pipelines. The load device comprises a counterweight assembly and a magnetic powder brake, the counterweight assembly provides a stepped load for linear or swing type actuating elements, and the magnetic powder brake provides a continuous load for rotary type actuating elements. The valve control architecture of the present application can be flexibly expanded, can simultaneously simulate stepped load and continuous load, is compatible with various actuators, and has strong versatility.

This invention relates to the technical field, specifically to a drilling fluid control system for fractured formations. The system includes a pressure difference extraction module, a flow velocity deviation extraction module, a fracture abrupt change identification module, a channel switching execution module, and a pump pressure adjustment execution module. In this invention, by analyzing the fluctuation amplitude of the pressure time series difference between different depths in the wellbore and comparing the flow velocity change trend, a joint identification mechanism for abnormal seepage path changes is established. This triggers control commands to drive adjustments to the delivery channel state, shortening the response cycle from identification to execution and improving the flexibility of path control. Furthermore, after the channel state switching is completed, pump pressure adjustment is performed based on the resistance characteristics of the current connection structure. By dynamically adapting the delivery frequency and pressure output, the matching and control of the fluid operating state are achieved, enhancing the drilling fluid's adaptability to fracture abrupt change environments, mitigating pressure disturbances caused by abnormal seepage, and maintaining a stable wellbore operating environment.

The invention relates to the technical field of medical instruments, in particular to a rectum varus suturing instrument under a laparoscope. Comprising a needle holding forceps body, a sleeve rod and a handle which are connected with each other are arranged on the needle holding forceps body, a fixed forceps head and a movable forceps head which are matched with each other are connected to the end of the sleeve rod, a U-shaped groove which is sunken towards the holding direction of the handle is formed in the handle, and a sliding block is installed on the clamping face of the fixed forceps head in a sliding mode. The sliding direction of the sliding block is parallel to the length direction of the fixed forceps head, an adjusting part for pushing the sliding block to slide is arranged on the handle, and when the fixed forceps head and the movable forceps head clamp the suture needle, the sliding block can drive the suture needle to rotate around the axis of the suture needle; the sliding block capable of sliding is arranged on the fixed forceps head, so that the angle adjustment work of the suture needle is achieved, the operation process is remarkably simplified, the adjustment efficiency is improved, and the forceps are particularly suitable for operation scenes such as rectum inversion suture under a laparoscope and the like which have high requirements for instrument control precision.

This application relates to the technical field of power optimization and dispatching, and in particular to a flexible control method, system, and power router for a power router. The method includes: when the power router is in operation, real-time acquisition of operating status data; calculation based on the operating status data using a preset flexible dispatching algorithm to obtain a dispatching decision result; adjustment of the power allocation and exchange boundaries between the power router's energy ports based on the dispatching decision result to obtain a flexible operating range; determination of the current operating mode based on the flexible operating range; and control of the power router to execute energy management actions corresponding to the current operating mode based on the current operating mode and operating status data. By constructing a flexible operating range, the system's adaptability and operational stability under varying operating conditions are improved, achieving rapid response in the time dimension and multi-port coordination in the spatial dimension for energy dispatching, comprehensively enhancing the operating efficiency and control accuracy of the power router.

The utility model discloses a canvas processing hot stamping equipment relates to printing technical field, including the support platform of the concave type, and the rear end both sides of support platform are fixedly connected with the limiting table, and the opposite end of two limiting table front ends outside is horizontally provided with first rolling groove, and the rear end both sides of support platform are provided with second rolling groove, and the locating groove of the through support platform is provided in second rolling groove, and the rear end one side of support platform top is fixedly connected with the support frame of L shape, and the locating assembly and hot stamping assembly are installed on support platform upper end, the utility model discloses the cooperation between locating assembly and rotating roller, support platform and support frame, realizes the efficient flattening of canvas and cleaning pretreatment, not only can in canvas conveying stage, through the synergies of first rotating roller and second rotating roller, two -way flattening is carried out to canvas, avoids the influence of wrinkle and hot stamping precision, still can clean the fuzz ball and other impurities on canvas surface through flexible brush, reduces the hot stamping of impurity, and improves hot stamping finished product quality.

The utility model discloses a kind of MCU power supply control circuit of linear drive device, controller and electric furniture, for realizing the zero power consumption standby of MCU and load wake-up.The technical scheme is: in standby state, MCU is completely powered off, but a DC output port remains electrified.When external load is connected to the DC output port and generates current, a passive detection circuit consisting of sampling unit and detection unit generates trigger signal, the trigger signal turns on a first switching unit, thereby connecting the power supply of MCU, wakes up MCU to perform subsequent tasks.The utility model triggers MCU power-on by passive detection mode, completely solves the standby power consumption problem of equipment, simple structure, response sensitive.

This application relates to a control method for an intelligent steam oven and an intelligent steam oven itself. The control method includes: real-time acquisition of environmental parameters within the oven cavity; these environmental parameters include relative humidity and temperature; determining parameter thresholds corresponding to the real-time environmental parameters; wherein the relative humidity corresponds to a first parameter threshold; and the temperature corresponds to a second and a third parameter threshold; comparing the real-time environmental parameters with the corresponding parameter thresholds, and controlling the condenser plate to activate a corresponding target mode based on the comparison result; the target modes include a cooling dehumidification mode and an auxiliary heating mode. This application solves the problems of dehumidification affecting cooking results and the limited functionality of dehumidification devices, avoiding the impact of dehumidification on cooking performance, and achieving bidirectional adjustment of the cavity environment by a single component, thus improving equipment utilization and control flexibility.

This application provides an endoscope control method, device, equipment, storage medium, and program product, applied in the field of endoscope control technology. The method includes: acquiring real-time visually perceived first endoscopic field of view during endoscope application; determining whether to trigger endoscope retraction based on a trigger retraction condition and the first endoscopic field of view; controlling endoscope retraction in response to the trigger retraction; and acquiring real-time visually perceived second endoscopic field of view during the control of endoscope retraction, and controlling the endoscope to stop retraction based on the trigger retraction condition and the second endoscopic field of view. This application aims to improve field of view recovery efficiency, control flexibility, better adapt to the dynamic and complex changes in surgical scenarios, and thus improve surgical safety and efficiency.

The embodiment of the present disclosure provides a kind of mechanical arm remote control method and device, belong to robot technical field.The device includes: universal joint, for receiving operation action to drive mechanical arm end movement operating handle and for connecting mechanical arm mechanical arm connecting piece, the universal joint is connected with the controller and the mechanical arm connecting piece respectively;Universal joint is provided with detection unit, and the detection unit is used to collect mechanical signal when the operating handle and the mechanical arm connecting piece generate relative motion, and the mechanical signal is used to indicate the force and moment between the operating handle and the mechanical arm connecting piece.This device, support operating handle relative to mechanical arm carries out multi-degree-of-freedom motion, and the detection unit of setting on universal joint accurately detects the mechanical signal corresponding to multi-degree-of-freedom motion, improves the flexibility and accuracy of remote control process.

The utility model belongs to the wet flue gas desulfurization technical field, concretely relates to a kind of intelligent purging device of mist eliminator differential pressure measuring pipeline, mist eliminator differential pressure measurement transmitter is communicated with mist eliminator high pressure pressure guide pipe, mist eliminator low pressure pressure guide pipe respectively, positive pressure side pipeline shut-off solenoid valve is set on mist eliminator high pressure pressure guide pipe, negative pressure side pipeline shut-off solenoid valve is set on mist eliminator low pressure pressure guide pipe, mist eliminator high pressure pressure guide pipe is connected with flow low switch by positive pressure side pipeline purging solenoid valve, mist eliminator low pressure pressure guide pipe is connected with flow low switch by negative pressure side pipeline purging solenoid valve, flow low switch is connected with compressed air pipeline by compressed air manual ball valve.The intelligent purging device of mist eliminator differential pressure measuring pipeline provided by the utility model is innovatively designed by hardware structure and intelligent control logic, effectively solve the problems, such as low degree of automation, sweeping strategy extensive, insufficient fault diagnosis capability etc.

The application provides a tunable pulse train laser and a design method thereof, the laser comprising a pumping light fiber coupling focusing system, a cavity mirror, a laser crystal, a passive Q-switching crystal, an active Q-switching system and a laser output mirror arranged in sequence according to an optical path; the tunable pulse train laser is configured to: in a working state, through the equivalent length control of the passive Q-switching crystal and the modulation control of the active Q-switching system, the number of pulse trains is controlled under the same main frequency, or the same pulse train is output under different main frequencies. The application uses the active Q-switching system and the passive Q-switching crystal in cooperation, uses the active Q-switching and the passive Q-switching in combination to obtain the output of the main frequency plus the pulse train, is favorable for the multiple processing at the same point in the fine machining, and the single pulse energy is constant, thereby providing a pulse train laser scheme which is lower in cost, more ingenious and simple in structure, good in regulation flexibility, and higher in stability and reliability of the laser.

The invention discloses a double-circuit intelligent control integrated power supply control system, and relates to the field of power supply control, and the system comprises a power supply module which is a double-circuit power supply and is connected with a double-circuit LED lamp; the detection module comprises an input voltage and current detection unit, an output voltage and current detection unit, a temperature monitoring unit, an environment illumination intensity detection unit and a human body detection unit; the control module comprises a main control unit, a first power supply control unit and a second power supply control unit; the main control unit controls the brightness of the double-loop LED lamp through the first power supply control unit and the second power supply control unit by utilizing an illumination control algorithm according to signals acquired by the environment illumination intensity detection unit and the human body detection unit; when the input voltage and current detection unit, the output voltage and current detection unit and the temperature monitoring unit detect abnormal parameters, a protection mechanism is triggered, and fault information is generated. According to the invention, the control flexibility, the collaboration and the operation efficiency of the dual-path power supply are improved.

The application discloses a control method and device of a winding machine and a readable storage medium, and relates to the technical field of equipment control. The control method of the winding machine comprises the following steps: before the winding machine performs coil winding on an iron core, determining a first winding turn number corresponding to the iron core; according to the first winding turn number, determining a second winding turn number corresponding to the iron core, wherein the second winding turn number is smaller than the first winding turn number; in the process of controlling the winding motor to drive the iron core to rotate at a first rotating speed to perform coil winding on the iron core, detecting the number of coils wound on the iron core by controlling a counter and a photoelectric switch; under the condition that the number of coils wound on the iron core is greater than or equal to the second winding turn number, controlling the winding motor to drive the iron core to rotate at a second rotating speed, wherein the second rotating speed is smaller than the first rotating speed; and under the condition that the number of coils wound on the iron core is greater than or equal to the first winding turn number, controlling the winding motor to stop working. The application improves the production efficiency of the winding machine.

This utility model discloses a circulating water heat recovery system for a biomass gasifier jacket coupled with a steam boiler, relating to the field of biomass gasifier technology. The gasifier body has a water-cooled jacket, a circulating water outlet, and a circulating water inlet. The water inlet of the first heat exchange channel in the heat exchanger and the water inlet of the first heat exchange channel in the air preheater are both connected to the circulating water outlet; the water outlet of the first heat exchange channel and the water outlet of the first heat exchange channel are both connected to the circulating water inlet; the flue gas outlet of the biomass gas steam boiler is connected to the flue gas inlet of the energy-saving device; the water supply pump outlet is connected to the water inlet of the second heat exchange channel in the heat exchanger; the water outlet of the second heat exchange channel is connected to the water inlet of the water-cooled heat exchange pipeline in the energy-saving device; the blower outlet is connected to the second air inlet of the heat exchange channel in the air preheater, and the second air outlet of the heat exchange channel is connected to the air inlet of the biomass gas burner in the biomass gas steam boiler. This utility model realizes the coupling of the circulating water of the biomass gasifier with the water and air supply of the biomass gas boiler, reducing the boiler's gas consumption.

The invention discloses an integrated thermal management system, a thermal management method of a vehicle, a refrigerator car and a medium, and relates to the technical field of vehicles. The integrated thermal management system comprises a refrigerant circulation loop, a battery cooling circulation loop, a battery heat exchanger and a waste heat air duct; the refrigerant circulation loop is connected with the battery cooling circulation loop through the battery heat exchanger, and the refrigerant circulation loop is connected with the waste heat air duct through the battery cooling circulation loop; the refrigerant circulation loop is used for driving a refrigerant to circulate and cooling a refrigerating box, a passenger compartment and a power battery of the refrigerator car through the refrigerant; the battery cooling circulation loop is used for adjusting the battery temperature of the power battery; the waste heat air duct is used for receiving waste heat generated by the refrigerant circulation loop and preheating the passenger compartment through the waste heat. The control flexibility of the integrated heat management system can be remarkably improved, and the energy consumption and cost of the whole refrigerator car are reduced.

The application discloses a control method and device for the running state of a household device, and belongs to the technical field of smart home. When the identity recognition device collects the biological features of an object, the control device can establish the binding relationship between the identity of the object and the initial position, and then can accurately determine the real-time position of the object according to the binding relationship, and control the running state of the household device based on the real-time position. As can be seen, the method provided by the application can control the running state of the household device without manual operation of the user, thereby improving the control efficiency of the household device, simplifying the operation of the user, and improving the user experience. In addition, the method provided by the application can control the running state of the household device based on the identity of the object, that is, the household device can provide personalized services for objects with different identities, thereby improving the control flexibility of the household device and further improving the user experience.

The application provides a winch cable arranging device adaptive control method and system. The winch adaptive cable arranging control depends on a system containing a winch controller, double motors and multiple sensors. The controller receives instructions and inquires the cable arranging motor position, and switches the speed or position control mode accordingly. In the speed mode, the theoretical speed of the cable arranging motor is calculated in combination with the drum rotating speed, cable diameter and lead screw pitch, the rotating speed is adjusted according to the deviation sensor data, and the PI algorithm output value is superimposed when the deviation exceeds the threshold. The PI algorithm adopts a combination strategy of variable proportional coefficient, anti-integral saturation and variable integral coefficient to realize adaptive coefficient and anti-saturation. In the position mode, the target position is calculated through the drum turn number sensor data, eight working conditions based on the position threshold, layer number and cable winding and unwinding state are covered, and the cable arranging and reversing alignment are ensured.

This invention discloses a DC bias suppression method for renewable energy access-type TAB converters based on operating condition mode classification, belonging to the fields of DC converters and power electronics. This method suppresses transient DC bias generated when the operating condition of a single output port of an isolated three-port converter changes. In implementation, the suppression time of transient DC bias is greatly accelerated by operating all three ports simultaneously. Due to the coupling relationship between the first port and the other two ports, a port compensation scheme is designed when the first port is in operation. By modeling the transient DC bias under the full-cycle, full-phase-shift state, real-time suppression of transient DC bias in isolated three-port converters can be achieved under conditions such as arbitrary operating condition switching and operating condition changes at any time during the working cycle.

This utility model relates to the technical field of liquid air energy storage systems, and in particular to an air liquefaction system with flexibly adjustable cooling capacity. The system includes a liquefaction cold box, a throttling and pressure-reducing device, a cold storage device, a gas-liquid separator, a flow control valve, a liquid air storage tank, a refrigeration expansion device, and related pipelines. This air liquefaction system, by installing a flow control valve and pipelines between the liquid air storage tank and the liquefaction cold box, allows for flexible adjustment and control of the air liquefaction process based on the air liquefaction operation status and corresponding control strategies within the cold box. This, combined with the cold storage device, gas-liquid separator, and refrigeration expansion device, enables flexible adjustment and control of the cooling energy demand and process requirements during the air liquefaction process. This reduces potential risks such as instability and uncontrollability in the liquefaction process caused by uncontrollable factors such as engineering flaws, equipment performance deviations, or cooling capacity loss, thereby improving the controllability and flexibility of project operation.

The invention relates to the technical field of intelligent control, and discloses a limit protection and fault-tolerant processing method, which comprises the following steps of: respectively carrying out deviation verification on forward and reverse position data when two-way limit is triggered and a position value at a diagnosis moment to obtain position difference data; and performing symbol identification on the difference between the upper limit and the lower limit to generate a safety sign and a border crossing sign. And performing logic judgment on the state data and the motion direction data based on the two to obtain fault judgment data. And performing type identification on the fault code to generate mode switching data, and performing shielding processing on the bidirectional limiting identifier according to the failure identifier to obtain an effective state identifier. And taking the effective state identifier as auxiliary monitoring data, switching the control basis into real-time position data according to the takeover signal identifier, and establishing a fault-tolerant control mode. And finally, boundary detection is performed on the real-time position data, and a corresponding protection instruction is generated according to a limit state. According to the invention, the efficiency of limit protection and fault-tolerant processing can be improved.

The application relates to the technical field of tunnel construction intelligent control, and discloses a tunnel lining construction intelligent trolley and a control system thereof. The system comprises a state change time point determined through event listening, according to which multi-source sensor data are intercepted and features are extracted. A mode matching module generates a quality difference measure by comparing a standard with an abnormal mode. A causal analysis framework with an operation frequency as an adjusting variable is innovatively introduced, the influence weight of each sensor data stream on quality is dynamically evaluated, and key quality factors are accurately identified. An optimized feature set is partitioned and merged based on a construction waveform time sequence relationship, and a control instruction is generated by adopting an attention mechanism. The scheme realizes the transformation from static threshold judgment to dynamic causal inference, adaptive control is realized through time sequence context understanding, and the quality diagnosis accuracy and the adaptive capacity of the system to complex working conditions are improved.

This invention discloses a dynamic flow shut-off valve, a flow regeneration and utilization system, and a control method. The dynamic flow shut-off valve includes: a hydraulically controlled pilot valve, a spool valve, a first control port Pi1 and a second control port Pi2, an inlet port P1, and an outlet port P2. The control oil output through the first and second control ports Pi1 and Pi2 controls the hydraulic pressure difference between the spool valve in the left and right working positions, thus controlling the valve orifice area. Based on the valve orifice area, the flow rate of the spool valve oil from the inlet port P1 to the outlet port P2 is controlled. Advantages: During boom descent and other actuators performing combined actions, the dynamic flow shut-off valve allows more flow to be directed to other actuators, accelerating their operation and improving work efficiency. Furthermore, the first valve core of the boom independently controls the return oil and back pressure of the boom's large chamber, no longer controlling the inlet oil of the boom's small chamber, avoiding the defects of single-valve core inlet and return valve orifice linkage control, and increasing control flexibility.