340 results about "Pressure feedback" patented technology

The invention relates to the technical field of spinning machines, in particular to a spinning machine precision control method suitable for a high-temperature working condition, and the method comprises the following steps: collecting multi-source information; establishing a mapping relation between the thermal error and the temperature field to obtain a thermal error prediction model, training and correcting the thermal error prediction model, and outputting a real-time thermal error prediction value; generating a comprehensive position compensation instruction and performing position compensation; the pressure feedback value collected in real time is compared with a corresponding preset threshold value, if the pressure feedback value collected in real time is larger than or equal to the corresponding preset threshold value, the comprehensive position compensation instruction is converted into a force control instruction, and if the actual axial pressure feedback value or the actual radial pressure feedback value is smaller than the corresponding preset threshold value in the force control process, the comprehensive position compensation instruction is converted into the force control instruction. If yes, returning to the position compensation mode. According to the method provided by the invention, comprehensive compensation and active inhibition of thermally induced errors can be realized, and the forming precision of high-temperature spinning and the surface smoothness of a workpiece are remarkably improved.

The invention relates to a compensation method of a spring compression type grinding sleeve wear compensation device based on an Archard model. The spring compression type grinding sleeve wear compensation device based on the Archard model comprises a grinding shaft, a grinding sleeve, a spring compression assembly, a parameter acquisition module, a compensation execution mechanism and a control module. According to the solution integrating abrasion prediction, real-time monitoring and dynamic compensation, accurate compensation of abrasion of the grinding sleeve is achieved by constructing the abrasion prediction model fusing the compression characteristics of the spring and combining a pressure feedback adjusting mechanism, and the stability and consistency of the machining process are guaranteed.

The invention discloses a carbon sequestration CO2 multi-layer injection and production collaborative balance system and method.The carbon sequestration CO2 multi-layer injection and production collaborative balance system comprises a multi-layer injection mechanism, a collaborative extraction mechanism and a regulation and control mechanism, the multi-layer injection mechanism comprises an injection well, an injection allocation device and a two-way packer, the injection well vertically penetrates through 2-4 target reservoirs, and the injection allocation device vertically penetrates through the two-way packer; each target reservoir in the injection well is correspondingly provided with an injection allocation device and a two-way packer, each injection allocation device comprises a pressure sensor, a flow controller and a communication module, the collaborative extraction mechanism comprises a plurality of water production wells, the water production wells are arranged on the periphery of the injection well, and the two-way packers are arranged on the periphery of the injection well. Each water production well corresponds to one target reservoir, an adjustable water pumping screen pipe, a pressure feedback valve and a flow metering device are correspondingly arranged in each water production well, the regulation and control mechanism comprises a controller and an optical fiber monitoring device, and the controller is electrically connected with the optical fiber monitoring device, the pressure sensor, the flow metering device and the pressure feedback valve. The carbon sequestration CO2 multi-layer injection-production collaborative balance system provided by the invention has the advantages of high safety and high efficiency.

The invention discloses a self-adaptive apple maturity lossless picking flexible claw and a picking method. The device comprises a base assembly, and a visual recognition module, a flexible clamping jaw assembly, a distributed pressure sensing module, a transmission execution module and a control unit are integrated on the base assembly. And the visual module adopts a depth camera and a YOLO11n model, judges the maturity grade in real time based on the apple red area proportion and is matched with the corresponding grabbing threshold force. The pressure sensing module is a thin film pressure sensor, and multi-point pressure feedback is achieved through a plurality of pressure detection points. The transmission module adopts a single motor to drive a lead screw nut lifting table, opening and closing of clamping jaws are synchronously controlled, the structure is light and simple, and cost is low. The picking method follows the process of recognition, matching, force control and picking, a cutter is not needed, lossless and high-success-rate self-adaptive picking is achieved, the problem of damage or failure caused by traditional fixed force control is effectively solved, the method is suitable for dense orchards, and the intelligent and lossless levels of apple picking are improved. The control unit is low in response delay and small in overshoot, and it is ensured that the grabbing force is accurately matched with the fruit state.

The invention discloses an oil storage tank body surface polishing treatment device, and relates to the technical field of tank body polishing, the oil storage tank surface polishing treatment device comprises a base and an oil storage tank, the base is provided with a plurality of rotating supports and auxiliary supports, the oil storage tank is placed between the rotating supports and the auxiliary supports, and the oil storage tank surface polishing treatment device further comprises a polishing assembly and a pressure monitoring mechanism; the polishing assembly and the pressure feedback mechanism are arranged on the two sides of the oil storage tank correspondingly. Pressure changes are monitored in real time through the pressure monitoring mechanism, the polishing condition of protrusions such as weld beading on the peripheral face of the oil storage tank can be accurately reflected, and therefore the polishing assembly is accurately shut down or the displacement mechanism continues to push the polishing assembly forwards, and the subsequent part of the oil storage tank is polished; and the problem of excessive polishing or insufficient polishing is avoided, accurate polishing treatment on the peripheral face of the oil storage tank is achieved, and the polishing effect is guaranteed.

The invention discloses an intracranial pressure intelligent monitoring system, which relates to the technical field of intracranial pressure monitoring, and comprises a continuous pressure conduction chain construction module for establishing a continuous pressure conduction chain of an intracranial pressure signal, carrying out time sequence segmentation analysis on the intracranial pressure signal acquired in real time, and obtaining a continuous pressure conduction chain of the intracranial pressure signal; identifying a section with lagging and smooth abnormity in the pressure feedback curve, and determining the section as a nonlinear response positioning range; and the elastic pressure buffer window adjusting module introduces an elastic pressure buffer window in the nonlinear response positioning range and adaptively adjusts the width of the elastic pressure buffer window according to the pressure change rate of the adjacent time slices. By constructing a continuous pressure conduction chain and introducing an elastic buffering and layering rearrangement mechanism, it is ensured that an intracranial pressure signal accurately reflects true pressure changes in the abnormal stage. Through dynamic weight band and rhythmicity balance regulation and control, self-adaptive stability of signal energy and a time structure is achieved, and continuity and early warning accuracy of intracranial pressure monitoring are improved.

The invention relates to the technical field of diaphragm pump automatic control, in particular to a diaphragm pump self-adaptive pressure relief and stabilization control method based on pressure feedback, which comprises the following steps: configuring reference parameters before starting and detecting faults of a pressure sensor, a pump driving unit and an electromagnetic pressure relief valve; obtaining an effective pressure value through moving average filtering; dynamically adjusting PID parameters according to the pressure deviation and the change trend; and pump rotating speed adjustment, graded pressure relief or emergency shutdown are executed according to the normal area, the early warning area and the overpressure area. The method effectively improves the pressure stabilization precision and the pressure relief response flexibility, comprehensively avoids the equipment fault risk, adapts to the working conditions of multiple fields, and remarkably enhances the reliability and practicability of system operation.

The invention relates to the technical field of automatic control, and discloses an automatic control method and system for bearing grease injection. The method comprises the steps that weight data in the grease injection process are collected, a weight change curve is obtained after filtering, and the flow pulsation amplitude is calculated; when flow pulsation is abnormal, pump cavity volume and pipeline impedance parameters are obtained, pump speed correction is calculated based on pressure feedback, the pump rotating speed is adjusted, and preliminary stable flow is obtained; the state of the servo system is monitored based on the initial stable flow, if the resonance peak value exceeds the limit, servo parameters are optimized, the pumping pressure is adjusted in combination with a temperature compensation mechanism, and a compensation pressure signal is obtained; the overshoot of the pressure signal is evaluated, if the overshoot exceeds the limit, the control parameters are adjusted, the pressure deviation is corrected, a final grease injection instruction is generated in combination with backpressure suppression, precise grease injection is executed, and the weight accumulation change is monitored to judge the completion state; and the deviation between the actual total grease injection amount and the target amount is calculated, the current parameter is recorded as the initial set value of next grease injection if the precision reaches the standard, and the control precision of the grease injection process is improved.

The invention discloses a pneumatic conveying flow self-balancing control method based on multi-point pressure feedback, and belongs to the technical field of industrial process intelligent control. Comprising the steps of collecting system operation data in real time through a sensor network arranged at key nodes of a pneumatic conveying pipeline, preprocessing the collected system operation data, constructing a space-time sequence data set, inputting the space-time sequence data set into a pre-trained flow balance degree identification model, and identifying the flow balance degree of the pneumatic conveying pipeline. The method comprises the following steps: acquiring a system flow balance degree, a flow estimated value of each branch and a system abnormity score, inputting the system flow balance degree, the flow estimated value of each branch and the system abnormity score into a multi-objective optimization control algorithm, generating an optimal control instruction, issuing the control instruction to each execution mechanism for execution, and according to system response, controlling the execution mechanism to execute the optimal control instruction. And repeating the steps in the next control period to realize closed-loop control. Balanced control over the flow of all the branches of the pneumatic conveying system is achieved, energy consumption is reduced, the material blocking fault is effectively prevented, and the system stability and the production efficiency are improved.

The invention discloses an intelligent segmented water injection system and method for coal seam gas extraction drilling based on stress response. An underground PLC (Programmable Logic Controller) and a pressure regulating pump station comprise a PLC, a pressure regulating electric pump, an electronic pulsation regulating valve and a pressure feedback sensor, and are arranged in an underground control roadway or a position close to a drilling hole; the air bag type multi-section hole sealing mechanism is composed of a plurality of phi73 double-channel expansion type air bag units, and each hole sealing unit is independently controlled by a hydraulic system and installed in the axial direction of a drill hole. The matched double-channel water injection drill rod and pulse spray head assembly comprises a hollow double-channel steel water injection drill rod, a flexible water conveying inner pipe and directional pulse spray heads located in all hole sealing sections. The ground water supply and proportional mixing wetting agent system comprises a ground water supply system, a three-way proportional mixer and a dosing pump; the coal stress and fracture structure comprehensive monitoring module is used for collecting key response information in the water injection process; the ground remote control and data analysis platform comprises an underground control cabinet and a ground data platform; the gas extraction efficiency can be improved.

The invention discloses a terminal pressure feedback variable frequency pump set cooperative adjustment method. A terminal pressure sensing module, a central control module, a variable frequency driving module and a plurality of variable frequency pumps connected in parallel are included. The throttling loss of the valve is avoided through the precise feedback of the tail end pressure and the cooperative adjustment of the variable frequency pump set, so that the pump set always operates in a high-efficiency interval (the efficiency is improved to more than 85%), and the energy is saved by 30-50% compared with the traditional constant-speed pump system; and meanwhile, multi-pump cooperative adjustment avoids long-term operation of a single pump in a low-efficiency interval, and the energy utilization rate is further increased. And the tail end pressure stability is high, the tail end most unfavorable point pressure is monitored in real time, and the tail end pressure fluctuation range is controlled within + / -0.02 MPa in combination with quick response adjustment within 50 ms, so that the problem of insufficient or overpressure of a far-end user is effectively solved, and the user experience is improved.

The invention relates to the technical field of metal pipe machining, in particular to a seamless steel pipe cutting-off device which comprises a bottom plate, a feeding mechanism, a supporting mechanism and a cutting-off mechanism, and the cutting-off mechanism comprises an annular cutting assembly, an inner supporting mechanism and an ejection assembly. The feeding mechanism and the supporting mechanism are matched to achieve coaxial positioning and precise feeding of the seamless steel pipe, the inner supporting mechanism drives a first supporting roller to form circumferential dynamic supporting in the steel pipe through a hollow shaft, precise adjustment is achieved in cooperation with pressure feedback, and pipe deformation is avoided; the girdling assembly achieves accurate girdling through gear transmission and electric push rod driving and is suitable for steel pipes of different specifications; the ejection assembly completes end face polishing while automatically discharging, and the fan blades synchronously achieve cooling and chip removal.

The invention provides an intelligent medical bed and a control method.The medical bed comprises a bed body frame and a bed surface covering the bed body frame, and the bed surface is composed of liftable units arranged in an array shape; each lifting unit comprises a lifting driving assembly, a supporting piece and a flexible supporting block, and a pressure sensor is arranged on each flexible supporting block and can detect the surface pressure in real time; the intelligent medical bed further comprises a central control system, and the central control system is electrically connected with the lifting units and used for receiving feedback signals of the pressure sensors and independently controlling lifting of the lifting units. The central control system is further connected with a posture scanning module and used for obtaining three-dimensional shape data of the body surface of the patient and generating an individualized bed surface supporting scheme through a built-in posture adjusting algorithm in combination with feedback of the pressure sensor. Multi-point independent adjustment can be achieved, intelligent pressure feedback is achieved, personalized body positions are supported, and the comfort and safety of a patient are improved.

The invention provides a tunnel waterproof bonding layer spraying setting self-adaptive control method based on a Kolmogorov-Arnold network and PID (Proportion Integration Differentiation). The method comprises the following steps: dividing spraying areas according to spraying width, and collecting multi-point water content, temperature and humidity, vehicle speed and historical film-forming deviation; calculating a wet point proportion and a wet-dry difference according to the water content distribution, performing temperature and humidity correction to obtain a film forming water influence value, and determining a spraying amount jump limit and spraying amount upper and lower limits; inputting the film forming demand characteristic quantity into a Kolmogorov-Arnold network to obtain the target flow of each spraying area, and correcting the difference of adjacent areas under the constraint; the PID forms actual flow according to the flow and the opening degree of the pressure feedback regulating valve; calculating a film-forming continuity index according to the appearance after spraying to obtain a current deviation, and updating a historical deviation for a next construction section; according to the method, the consistency of spraying quantity setting and execution can be improved, and the film forming continuity is improved.

The invention discloses a low-temperature-impact-resistant high-strength bolt for a high-cold railway and a heat treatment method of the low-temperature-impact-resistant high-strength bolt. The bolt is of a special three-layer structure of a base body, a bionic nanometer laminated layer and a high-entropy alloy nitriding layer, wherein the grain size of the base body reaches the ASTM8 level or above; the bionic nano laminated layer is formed by alternately depositing TiN and VC, and the thickness of a single layer is less than 50nm; the high-entropy alloy nitriding layer is made of AlCoCrFeNiTi, the thickness is larger than 50 microns, the heat treatment method comprises the steps of grain refinement pretreatment, lamination preparation through magnetron sputtering, high-entropy alloy laser cladding, electromagnetic field assisted nitriding, oil quenching, cryogenic oscillation, tempering and the like, and intelligent quality control means such as a machine learning model, sound pressure feedback and image recognition are integrated. According to the scheme, the impact energy of the bolt at the temperature of minus 60 DEG C is higher than 55 J, the tensile strength is larger than 1200 MPa, the surface hardness is not lower than 1200 HV, the interface bonding critical load is higher than 80 N, and the problems of low-temperature brittle fracture, obdurability contradiction and quality consistency of the high and cold bolt are solved.

The utility model relates to the technical field of hydraulic systems, in particular to an oil return compensation multi-way output hydraulic system for a tractor and the tractor, the input end of a main pump is communicated with a hydraulic oil tank, the output end of the main pump is connected with a port P of a multi-way output valve through a pipeline, and a plurality of valve assemblies are arranged in the multi-way output valve; the valve assembly is connected with a pressure feedback channel of the multi-way output valve through a shuttle valve, an oil return opening of the valve assembly is connected with an oil inlet of the pressure compensation valve through a pipeline, an oil return opening of the pressure compensation valve is communicated with the hydraulic oil tank through an oil return pipe, and an oil outlet of the shuttle valve conveys screened load pressure to a non-spring side control cavity of the pressure compensation valve. A load sensitive oil port of the valve assembly is connected with a spring side control cavity of the pressure compensation valve through a load feedback oil way. According to the utility model, multiple loads can work at the same time, and the opening of the pressure compensation valve is reduced through the screening of the shuttle valve, so that the balance of each load is obtained, and the adaptability, comfort and safety of the tractor and an executive component are higher.

The invention relates to the technical field of conveying and processing, in particular to a paperboard double-face film covering and overturning processing device and method, and the paperboard double-face film covering and overturning processing device comprises a feeding conveying assembly, a first film covering assembly, an overturning assembly, a second film covering assembly and a discharging conveying assembly. According to the overturning assembly, a feeding inclined conveying line, a pulse blowing structure and an auxiliary supporting structure are matched, when a paperboard extends by a preset length, a photoelectric trigger starts an air pump to generate pulse airflow to blow up the paperboard, and then a rotating roller set and a limiting plate provide supporting to complete automatic overturning. The first film covering assembly and the second film covering assembly each comprise a lifting structure with pressure feedback, a gluing roller set and a drying structure, and precise gluing and drying are achieved. By means of the overturning mode combining pneumatic blowing and mechanical supporting, the problems that traditional manual overturning is low in efficiency and prone to damaging paperboards and an existing automatic device is poor in adaptability are solved, and the automatic paperboard overturning device has the advantages of being compact in structure, reliable in overturning, high in yield and capable of being seamlessly connected with a production line and is suitable for continuous double-face film covering machining of various paperboards.

The utility model discloses a kind of sealing pressure reducing valve, it is related to pressure reducing valve technical field, including valve body, the water inlet end and water outlet end are respectively arranged in the both ends of valve body;Valve body inside is equipped with pressure reducing chamber, the bottom of pressure reducing chamber is communicated with water inlet end, the top of pressure reducing chamber is communicated with water outlet end, the top of valve body is fixedly connected with installation sleeve pipe, the bottom of valve body is equipped with overhaul hole.This kind of sealing pressure reducing valve, the utility model passes through the multistage linkage structure of pressure reducing chamber, drive cavity and pressure chamber, forms closed loop pressure feedback mechanism, when the pressure change in pressure reducing chamber, pressure reducing plug changes drive cavity pressure distribution by adjusting rod driven trigger plug, the pressure change is transmitted to pressure chamber after pipeline, can directly drive flow control plug to carry out displacement adjustment, realize the dynamic control to the communication area of flow control chamber and pressure chamber.Simultaneously, the buffering effect of adjusting spring further inhibits pressure fluctuation, ensure that water outlet end pressure output is stable.

The utility model discloses a direct-viewing pressure feedback type radial artery compressor, and belongs to the field of medical instruments. A direct-view pressure feedback type radial artery compressor comprises a fixing plate, a pressure feedback device and a pressure feedback device. The bandage is arranged at one end of the fixing plate and binds the fixing plate to the arm of the patient; the direct-viewing pressure feedback type radial artery compressor further comprises a pressure applying piece and a pressure feedback piece, wherein the pressure applying piece is movably arranged on the fixing plate; the driving group is arranged on the fixed plate and is used for driving the pressure applying piece to move; the air bag is arranged on the pressure applying piece, located at the lower end of the pressure applying piece and abutted against the arm of the patient; the pressure indicating piece is arranged on the pressure applying piece in an up-down sliding manner; an air hole communicated with the air bag is formed in the pressure applying piece; the pressure indicating piece is arranged in the air hole in an up-down sliding mode. The direct-view pressure feedback type radial artery compressor has the beneficial effect that the direct-view pressure feedback type radial artery compressor with the indication function is provided.

This application relates to a machine vision-based intelligent installation accuracy control method, system, and computer-readable storage medium for tunnel steel arch frames. The method includes: synchronously acquiring visual images, 3D point clouds, and motion state data of the steel arch frame and performing spatiotemporal alignment; compensating for vibration noise in the point cloud to generate a denoised 3D point cloud; identifying the coordinates of the arch apex and left and right arch foot points, constructing a topological skeleton, outputting a structured feature set, and registering and comparing it with a preset design model to calculate the deviation; selecting a control mode based on the deviation and generating a hydraulic adjustment command set; constructing a hysteresis compensation model to correct command transmission delay; controlling distributed hydraulic jacks to perform displacement actions according to the corrected commands, monitoring displacement and pressure feedback data in real time and triggering a new round of data acquisition, calculating the pose deviation, and performing iterative control until the deviation is less than or equal to a threshold, at which point a steel arch frame locking signal is output. This application improves the installation efficiency and accuracy stability of tunnel steel arch frames.

The invention discloses a corrosion-resistant self-compensation sealing stop valve, and relates to the technical field of valves, the corrosion-resistant self-compensation sealing stop valve comprises a valve body, an elastic sealing seat, a valve core and a self-compensation sealing control assembly, and the control assembly comprises a parameter acquisition module, a signal preprocessing module, a main control decision module, an electric control execution module and a feedback verification module. In the working process, multi-dimensional signals such as sealing abrasion and medium characteristics are collected firstly, after anti-interference and standardization processing is conducted, the main control decision module calculates the sealing compensation amount through an algorithm, correction is conducted in combination with the corrosion working condition, then a driving instruction is generated through abnormal fault-tolerant processing, and the electric control execution module adjusts the sealing gap and pressure through the electric push rod and the micro air pump. And the feedback verification module performs real-time feedback to form a closed loop. The valve achieves sealing self-adaptive compensation, is high in corrosion resistance and interference resistance, accurate and stable in sealing, capable of prolonging the service life of core components, adaptive to complex working conditions and high in practicability.

The application belongs to the technical field of display glass processing, and particularly discloses a display glass corner high-precision grinding system and a method thereof. The device comprises a workbench, a grinding device, a grinding moving support, a pressure adjusting system, a pressure feedback system, a fixing tool, a positioning adjusting device, a positioning detection system, a power system and a central control system. The grinding pressure is controlled through equidistance grinding, and the process data is processed by the central control system. The grinding process is continuously iteratively optimized. The grinding head wear can be calculated and the influence of the grinding head wear on the precision can be eliminated. The edge quality consistency and high precision of the display glass are ensured. The device is especially suitable for batch processing of the same specification. Through the space-time coupling relationship between the pressure and the error, the position-related pressure compensation along the grinding path, the weighted learning of the historical grinding data, the stability guarantee of the system dynamic characteristics and the real-time pressure fluctuation compensation are realized.

According to the underwater emergency cable cutting device, a movable cutter is hydraulically driven to be matched with a fixed cutter to form a shearing pair, the shearing mechanical performance is optimized, the cutting efficiency of a composite cable is improved, a gradual closed shearing force field can be formed during shearing due to the design of an arc-shaped cutting edge of a crescent cutter head, and acting force is evenly distributed along the section of a cable; the cable is especially suitable for a composite cable structure in which an outer sheath and inner tensile fibers are mixed. The guide mechanism forcibly restrains the motion trail of the moving cutter head, it is ensured that the cutting edge is closed along a preset path all the time in the shearing process, precise shearing path control is achieved, and secondary damage is avoided; the self-adaptive cable diameter guide-hydraulic linkage control and guide chute integrated pressure feedback module adjusts the output pressure of the hydraulic system in real time. The limitation of a traditional disposable gunpowder or pull pin type device is broken through, and a modularized shearing unit and a quick reset oil cylinder are designed.

The invention relates to the technical field of hard tubular bus grounding tools, and particularly discloses an extra-high voltage hard tubular bus grounding device, which comprises a fixed base; the movable pressing head is hinged to the fixed base through a rotating shaft, a pressing face is formed on the inner side of the movable pressing head, an involute gear structure is formed on the outer side of the movable pressing head, and ratchets are arranged on an involute gear; the driving handle is connected to the pawl, and the pawl is meshed with the ratchets on the movable pressing head; the pressure sensing module is embedded into the pressing surface of the movable pressing head or the pressure-bearing surface of the fixed base and is used for directly detecting the clamping pressure on the cable and the tubular bus; and the feedback module is connected with the pressure sensing module and used for providing perceptible feedback of the real-time clamping pressure. Therefore, the defects of a conventional grounding wire are overcome, and the cable can be safely, conveniently and reliably mounted on the hard tubular bus, so that the blank in the prior art is filled by providing a temporary grounding point with a clear state, and a safety guarantee is provided for the maintenance work of core equipment of an extra-high voltage transformer substation.

The utility model discloses a casting molding compaction mechanism based on pressure feedback, which comprises a frame and a working plate in bolted connection with the bottom of the frame, the top of the working plate is provided with a molding compaction die, the frame is an L-shaped frame, and the side wall of the frame is in bolted connection with a compaction driving mechanism for driving the molding compaction die to move up and down to realize mold closing compaction. The pressure feedback device is arranged, the pressure sensor is used for detecting the compaction pressure in real time, data are transmitted to the data processing unit to be analyzed and processed, the driving motor can be accurately controlled, real-time adjustment of the compaction pressure is achieved, the problem that a traditional compaction mechanism is not accurate in pressure control is solved, and the compaction efficiency is improved. And the multiple pressure sensors evenly distributed in the compaction mold can comprehensively and accurately detect the pressure, the situation that the compaction effect is not uniform is effectively avoided, and the quality stability of casting forming is improved.

The application discloses a pressure reducing valve with positive fluctuation of output pressure with output flow, comprising a pressure reducing valve and a pilot valve, wherein a pressure regulating spring and a stiffness adjustable spring are arranged in the pilot valve, the action of the valve rod of the pressure reducing valve directly pushes the stiffness adjustable spring in the pilot valve, and the stiffness of the stiffness adjustable spring is smaller than that of the pressure regulating spring; the input port of the pressure reducing valve is connected with the control cavity and the inlet of the pilot valve through a connecting pipeline and an adjustable throttle valve, and the output port is connected with the output pressure feedback interface of the pilot valve through a connecting pipeline and a stop valve. The output pressure of the pressure reducing valve positively fluctuates with the output flow, the output pressure is large when the water flow is large, and the output pressure is small when the water flow is small, so that the pressure borne by the whole pipeline system in the water low period is reduced, the pipe leakage and pipe explosion rate are reduced, the reliability of the water supply system is improved, and the maintenance cost is reduced.

The utility model relates to the technical field of bale collecting equipment, in particular to a hydraulic system of a small square bale bundling and collecting machine. The main hydraulic system comprises a plunger variable pump, a high-pressure filter and an electric proportional multi-way valve; the plunger variable pump adopts a plunger variable pump with pressure cut-off and load sensitive functions, and the electric proportional multi-way valve is a load sensitive electric proportional multi-way valve; the plunger variable pump is powered by a power shaft of a tractor; an oil inlet of the electric proportional multi-way valve is connected with a pressure oil port of the plunger variable pump through the high-pressure filter, and the high-pressure filter filters rolling oil. A control oil return port of the electric proportional multi-way valve is connected with the oil tank, and a load pressure feedback signal output port is connected with a feedback oil port of the plunger variable pump; the electric proportional multi-way valve comprises a multi-union reversing valve which is connected with an actuator to form hydraulic loops with different functions. The hydraulic system has the advantages of being high in output efficiency, saving fuel oil, reducing oil consumption, reducing heating of the hydraulic system, prolonging the service life of hydraulic elements and reducing pollution.

The invention discloses a self-adjusting overpressure protection overflow valve, and relates to the technical field of valve control, the self-adjusting overpressure protection overflow valve comprises a valve body, the valve body comprises a main valve core and a valve cavity extending axially, the upper part of the main valve core is fixedly sleeved with a valve sleeve, and the side end of the valve sleeve is provided with a valve seat; the first annular damping groove, the second annular damping groove and the third annular damping groove with the through-flow sectional areas changing in a stepped mode are formed in the rear end of the main valve element and form dynamic matching related to displacement with the feedback hole, and the damping self-adjusting function of the overflow valve in different overpressure states is achieved. When the pressure is small, the feedback hole is communicated with the third annular damping groove with the minimum sectional area, strong damping is provided for restraining the valve element from jumping off, the opening process is soft and stable, and pressure impact is effectively eliminated; during moderate and overpressure, the feedback hole is switched to the second annular damping groove, damping is moderate, and dynamic pressure feedback is formed; when overpressure is large, the feedback hole is communicated with the first annular damping groove with the largest sectional area, feedback pressure is established rapidly, and rapid full-open overflow under the emergency working condition is ensured.

The application discloses a power cable stripping device and belongs to the technical field of power construction tools. The stripping device comprises a guide frame, a stripping frame, a driving motor, a screw rod and a pressure sensing and stripping mechanism. During operation, the driving motor synchronously drives the upper die and the lower die in the guide frame to move towards each other through a gear and toothed plate linkage mechanism, clamps and lifts the cable, and ensures that the cable is parallelly fed into the stripping station. In the stripping frame, the rotating screw rod drives the lifting seat to press down, and the cutting disc contacts the cable. The pressure sensing mechanism extrudes the elastic pad block with the pressure sensor inside through the pressing block, converts the mechanical pressure into an electrical signal in real time, and transmits the electrical signal to the PLC processor, so that the accurate monitoring and regulation of the cutting pressure are realized. The application ensures smooth feeding through mechanical linkage, realizes accurate control of the cutting depth by using pressure feedback, effectively avoids the problems of repeated operation or damage to the conductor caused by too shallow or too deep cutting in the traditional stripping process, and improves the efficiency and safety of the stripping operation.

The utility model relates to the technical field of scissor lifting platforms, and discloses a fixed scissor lifting platform, which comprises a base, a scissor arm group and a lifting platform, a transverse stabilizer bar is arranged at the intersection of the scissor arm group, and the transverse stabilizer bar comprises a sleeve and a bidirectional hydraulic damper; the two ends of the sleeve are fixed to the hinged shafts of the two sections of symmetrically-arranged shear fork arms through flanges respectively. The cross arm moves synchronously along with the transverse deviation of the shear fork arm; the two-way hydraulic damper is arranged in the middle of the sleeve, and the ends of two piston rods of the two-way hydraulic damper are connected with compressible springs. A pressure feedback sensor is arranged on the contact face of the hinge shaft and the sleeve and used for monitoring the transverse stress of the shear fork arm in real time, the bidirectional hydraulic damper is matched with the compressible spring, bidirectional buffering and stability can be achieved, the spring can adjust the reset force according to loads, the hydraulic damper consumes energy efficiently, transverse shaking is remarkably reduced, and stability and working precision are improved.