668 results about "Local pressure" patented technology

The invention discloses a sliding bearing friction wear prediction method based on fluid mechanics, and relates to the technical field of mechanical state monitoring, and the method comprises the steps: collecting single-point temperature, local pressure, vibration time domain signals and a bearing pedestal inclination angle through a sensor, and generating sensor data; performing field reconstruction based on a fluid mechanics conservation equation on the sensor data to obtain multi-field data; performing spatial alignment on the multi-field data, inputting the multi-field data into a long short-term memory (LSTM) network, and generating wear state characteristics; training a sparse correlation vector machine regression model RVM by using the historical wear data, establishing a nonlinear mapping relationship between the wear state characteristics and the wear depth, taking the wear state characteristics as the input of the vector machine regression model RVM, and outputting the predicted wear depth; sensor data and the predicted wear depth are fused in real time through Kalman filtering, and when prediction deviation exceeds a covariance threshold value, vector machine regression model RVM parameters are updated.

The invention discloses an intelligent pressure self-adaptive anti-bedsore nursing mattress system which comprises a flexible pressure sensing layer configured on the surface of a mattress and used for monitoring pressure distribution data of all parts of the body of a lying person in real time; the multi-air-chamber dynamic adjusting structure comprises a plurality of independent air chambers capable of being inflated and deflated, and the air chambers are distributed in the mattress and used for adjusting the supporting pressure of the corresponding areas according to instructions; the edge intelligent control module analyzes data based on a preset artificial intelligence algorithm to predict a bedsore occurrence risk area, and generates a control instruction according to a prediction result to drive the multi-air-chamber dynamic adjustment structure to adjust the pressure of each air chamber; and the environment regulation and control system comprises a temperature and humidity sensor and a microenvironment regulation device. Through real-time body pressure monitoring, AI risk prediction, dynamic pressure regulation and temperature and humidity coordinated regulation and control, local pressure can be remarkably reduced, a high-risk area can be early warned in advance, and a local microenvironment is improved, so that bedsores are effectively prevented, and nursing dependence is reduced.

The invention belongs to the technical field of bridge engineering, and aims to eliminate the problem of systematic underestimation of web bearing capacity under the condition of standard effective loading length. The invention provides a method for correcting a local pressure bearing capacity calculation formula of a steel beam web, which comprises the following steps of: identifying and determining a key parameter ratio and an engineering application range thereof by carrying out sensitivity parameter analysis on a bending reduction coefficient; on the basis of the reference engineering case, fixed values are taken from part of parameters, and other geometric quantities are inversely calculated; based on a preset variable sequence, finite element models are established in Abaqus in batches, and the ultimate bearing capacity and the flange longitudinal stress level of each model are extracted; the standard calculation value is corrected according to a finite element result, the corrected ultimate bearing capacity of the steel beam web is calculated, and a corrected bending reduction coefficient is obtained accordingly; and finally, fitting a corrected formula about the regularized slenderness ratio on the correction coefficient by taking the specification parameter as an independent variable to obtain an expression capable of directly replacing the original specification. The method can significantly improve the calculation precision.

The invention discloses a low-flow precision detection metering method suitable for a water meter, which comprises the following steps: S1, arranging a texture coating on the surface of a fluid channel in the water meter, interacting a groove with fluid to generate periodic pressure pulsation, collecting a local pressure fluctuation signal generated when the fluid passes through the groove, and processing to obtain a first flow value; s2, full-band pressure pulsation signals at an outlet of the water meter are collected, a pressure-flow model is established, and a second flow value is obtained; s3, constructing a first fusion model, and inputting the first flow value and the second flow value into the first fusion model to obtain a preliminary fusion flow value; s4, inputting the preliminarily fused flow value and environmental parameters into a correlation model to obtain a corrected flow value; and S5, constructing a second fusion model, inputting the corrected flow value and the predicted flow value into the second fusion model, and outputting a low-flow metering result of the water meter. According to the invention, the applicability and reliability of the water meter in a low-flow scene are enhanced.

The invention relates to the technical field of automatic control, in particular to a low-temperature control system of a centrifugal variable-frequency magnetic suspension water chilling unit, which comprises an environment heat parameter detection module, a condensation pressure deviation identification module, a condensate water flow rate regulation and control module, a refrigerant flow evaporation linkage module and an energy consumption curve dynamic construction module. According to the method, the inlet and outlet water temperature of the condenser and the external air temperature are collected, and synchronous filing and water temperature difference rate normalization processing are combined, so that when the external temperature changes drastically, the abnormal trend of water temperature change lag can be captured in time, and the condensation instability risk is pre-judged in advance; based on local pressure change rate gradient density analysis, abnormal fluctuation of condensation pressure is precisely discriminated, the problem that the local instability risk is covered by a global mean value is avoided, and the early warning timeliness is improved; the flow speed of condensate water is dynamically adjusted according to condensation instability characteristics, PID dynamic correction is conducted by extracting the rotating speed and flow speed error of a water pump, it is ensured that the heat exchange performance of a condenser continuously meets the low-temperature change requirement, and the condensation pressure stability is remarkably improved.

The invention provides a casting and forging composite forming method and die for an aluminum alloy structural part. A certain downward pressing amount is reserved for a male die; the cavity is filled with the metal melt at a certain speed under the pushing of the injection punch; increasing the pressure of the punch and maintaining the pressure (indirect extrusion casting); the pressurizing pin is started to carry out local pressurizing feeding; and the male die moves downwards by a certain distance, high pressure is applied, and closed die forging is conducted on the casting in the semi-solidified state. The mold structure comprises a shell part, a forming part, a flash storage and exhaust part, a pouring system, a temperature adjusting and monitoring system and a demolding system. The extrusion casting process and the closed die forging process are integrated in one set of die and are achieved through the extrusion casting machine, the performance of a final product is better than that of an extrusion casting method, the forming process is easier to achieve compared with forging, meanwhile, the production cost is lower, and the method is particularly suitable for forming machining of high-performance safety parts, structural parts and complex parts.

The invention provides a curved surface detection method and device for an ergonomic chair back and a storage medium, and relates to the technical field of irregular surface detection. Comprising the following steps that S1, a plurality of detection units abutting against the curved surface of the chair back are provided, and each detection unit outputs pressure according to the height of the curved surface; s2, the multiple detection units are adjusted to be in a standard state, and in the standard state, each detection unit abuts against the curved surface of the standard chair back; s3, enabling the plurality of detection units to abut against the curved surface of the chair back to be detected so as to output and upload pressure; and S4, processing the uploaded pressure, and judging whether the curved surface of the to-be-detected chair back is qualified or not. According to the application, the plurality of local pressures of the curved surface of the chair back are detected in combination with the plurality of detection units, the curved surface bending shape of the chair back can be accurately detected and whether the curved surface of the chair back is qualified or not can be judged by analyzing and processing the plurality of local pressures, and the technical deficiency in the aspect at present is made up.

The invention discloses a gas lift reverse circulation drilling starting pressure and circulation gas supply pressure calculation method. The method comprises the following steps that S1, hydrostatic pressure of the bottom of an inner pipe of a double-wall drill rod is calculated; s2, calculating the friction loss pressure of compressed air of an outer annulus of the double-wall drill rod; s3, calculating the friction loss pressure of the compressed air flowing through the earth surface gas transmission channel; s4, calculating the local pressure loss of the compressed air passing through the orifice in the gas-liquid mixer from the outer pipe of the double-wall drill rod; s5, calculating the liquid phase flow friction pressure loss of the inner pipe of the double-wall drill pipe; s6, calculating the liquid-phase flow friction pressure loss of the deslagging pipeline; s7, calculating the three-phase flow pressure drop of the inner pipe of the double-wall drill pipe; and S8, the starting pressure and the circulating air supply pressure are calculated. According to the method for calculating the starting pressure and the circulating gas supply pressure of the gas lift reverse circulation drilling, the starting pressure and the circulating gas supply pressure of the gas lift reverse circulation drilling can be accurately and conveniently calculated by accurately calculating the pressure of each part of the gas lift reverse circulation drilling process, and a theoretical basis is provided for stable and efficient operation of a circulating system.

The invention discloses an intelligent layering and guiding device for highway tunnel fire smoke and a control method, and relates to the technical field of tunnel fire safety, a smoke flow Froude number is introduced as a direct control target, the parameter represents the ratio of smoke flow inertia force to buoyancy force, the numerical value directly determines the stability of a layering interface, and the layering interface can be directly controlled. The Froude number of each subarea of the tunnel is calculated in real time through a sensing network and is compared with a critical value calibrated through an experiment, when a real-time value is lower than the critical value, it is indicated that inertia force is relatively insufficient, the buoyancy effect is dominant, and instability and entrainment are likely to happen to an interface between a smoke layer and lower cold air, and then according to a control algorithm, the smoke layer and the lower cold air are controlled. The micro jet fan applies directional inertia force to a smoke layer by adjusting the angle and the speed, the intelligent induction smoke outlet optimizes local pressure difference and flow by adjusting the opening degree and assists in maintaining flowing, the smoke flowing state is actively locked in a stable layered flow interval, and mixing and sedimentation caused by flow state instability are prevented.

The invention discloses a pressing device for rubber product processing, and relates to the technical field of press machines for rubber processing, the pressing device comprises a press machine rack, a press roller driving mechanism, a pressure adjusting piston, a main press roller, an auxiliary press roller, a pressure feedback piece, a magnetic compensation piece and a rubber contour prediction piece, the press machine rack is internally provided with a pressing chamber; a main compression roller and an auxiliary compression roller are installed through a supporting seat and driven by a compression roller driving mechanism to rotate, a pressure adjusting piston adjusts the overall pressure of the main compression roller, a pressure feedback piece on the main compression roller can dynamically detect the pressing pressure and generate a magnetic field, and a magnetic compensation piece of the auxiliary compression roller is matched with the magnetic field to achieve local pressure compensation. Compared with an existing press machine, the press machine has the advantages that the press fit quality and stability of rubber products can be improved through pretreatment detection, gradient pressure compensation and multi-parameter cooperative control, and the production efficiency is improved. And the universality and adaptability of equipment are enhanced.

The invention belongs to the field of target drone fuel oil systems, and particularly relates to a self-adaptive supersonic speed target drone fuel oil system and a control method thereof. The system comprises a machine body oil tank, a first electromagnetic valve, an overflow valve, a pressurization oil tank, a fuel pump, an engine pump, a monitoring module and a control module. The body fuel tank comprises a main fuel tank and an auxiliary fuel tank which are arranged in a fuel tank in the middle of the target drone body and located in front of and behind the theoretical mass center of the target drone respectively. The pressurization oil tank is additionally arranged in the fuel oil cabin, fuel oil in the engine body oil tank enters the pressurization oil tank for pressure maintaining after being pressurized by the fuel oil pump, and then oil is supplied to the engine from the pressurization oil tank, so that stable oil supply to the engine is achieved by establishing a local pressure environment instead of a large pressure environment of the whole fuel oil cabin, and therefore when a fuel oil system works, the fuel oil can be stably supplied to the engine. The oil supply flow and pressure are controlled in a closed-loop mode in real time through the control system according to the engine state.

The invention provides a machining tool for fixing a rotor room, and relates to the technical field of machine tool machining, the machining tool comprises a base, a supporting part and clamping parts, the supporting part is used for supporting the bottom of the rotor room, the multiple clamping parts are arranged at equal intervals in the circumferential direction of a preset axis, and the axis of the rotor room coincides with the preset axis; the clamping part comprises a support and two clamping plates, the clamping plates are made of elastic materials, the support is provided with a moving part and a middle part which are connected with the clamping plates, the two clamping plates are arranged on the inner side and the outer side of the side wall of the rotor room respectively, and the moving part enables the two clamping plates to be close to each other in the radial direction of the rotor room and abut against the side wall of the rotor room. And meanwhile, the middle part enables the clamping plates to generate deformation attached to the side wall of the rotor room so as to fully clamp the side wall of the rotor room in the radial direction, the supporting area of the clamping plates to the rotor room is large, the multiple clamping parts enable supporting points to be reasonably distributed, the local bearing pressure of the rotor room is reduced, elastic deformation or plastic distortion of the rotor room is reduced, and therefore the machining precision is guaranteed.

The invention discloses a steel ladle slag line magnesia carbon brick masonry positioning device, and particularly relates to the technical field of steel ladle slag line masonry, the steel ladle slag line magnesia carbon brick masonry positioning device comprises a supporting ring located above a steel ladle, a positioning masonry assembly is arranged at the bottom of the supporting ring, and the positioning masonry assembly comprises a first gear ring arranged at the bottom of the supporting ring; and the bottom of the first gear ring is fixedly connected with a reinforcing ring. A first motor drives a gear ring to transmit and drives a reinforcing ring to rotate, all hinge blocks drive a masonry pressing plate to deflect synchronously in the same direction by means of sliding fit of an inclined guide groove and a sliding column, the masonry pressing plate forms circumferential synchronous pressurization on a brick ring through an abutting arc plate, it is ensured that the brick ring bears uniform pressure in the whole circumferential direction, and the construction efficiency is improved. The problem that local pressure is not uniform in manual masonry is solved, a core foundation is laid for forming a stable self-locking structure for the brick ring, meanwhile, mechanization of pressurization operation is achieved, manual pressurization is replaced, and the labor intensity of foundation pressurization is greatly reduced.

The invention discloses a partial pressure type extensible medical elastic cap, and relates to the technical field of neurosurgery postoperative nursing instruments, the partial pressure type extensible medical elastic cap comprises a partition debugging assembly, the outer surface of the partition debugging assembly is provided with a connecting assembly, and the partition debugging assembly comprises an elastic cap body. According to the partial pressure type extensible medical elastic cap, in order to improve the practicability of the elastic cap for head pressure bandaging after the craniocerebral operation, the main body width of the elastic cap body is increased to 10 mm, the gradient pressure weaving technology is adopted, the central area is formed by processing a high-elasticity weaving layer, the low-pressure area is formed by processing a low-elasticity weaving layer, the cutting feeling can be reduced, and the elastic cap is more practical. The elastic cap can be prevented from being in contact with auricles, opening and closing of the elastic cap can be achieved through the combination of the two corresponding neodymium magnets, the purpose of locally pressurizing the head of a patient can be achieved by pressurizing the air bag, and the elastic cap is convenient to use. The problem that a traditional medical elastic cap in the prior art is simple in structure and low in practicability is solved.

The invention relates to the technical field of automobile part processing and transportation, in particular to a transportation device for automobile part processing, which comprises a conveying belt device, a centering mechanism and an intermittent mechanism, a visual detection device is fixedly connected onto the conveying belt device, and the intermittent mechanism rotates synchronously in opposite directions through a rotating rod of the centering mechanism. The crank is driven to drive the fixing rod to rotate synchronously, so that the arc-shaped block on the outer surface of the connecting sleeve is close to and attached to the outer surface of the automobile hub part in a centering mode and is matched with the inwards-concave arc-shaped surface of the automobile hub part. The arc-shaped blocks are attached to the surface of the workpiece, the contact area is increased, pressure is dispersed, and workpiece deformation or surface damage caused by too large local pressure is avoided; the centering mechanism drives the abutting rod of the intermittent mechanism to ascend and descend in a reciprocating mode, so that intermittent conveying of the hubs is achieved, the multiple hubs are prevented from being concentrated, and workpiece accumulation possibly caused by continuous conveying is avoided.

A local pressure-changing device 31 has a driving part (pressure cylinder 35) for advancing an advancing / retreating member 33. The advancing / retreating member 33 can advance to a space 107 constituting a mold (a fixed mold 103) and can retreat to the opposite side in a state where a tip of the advancing / retreating member is exposed to the space 107. The pressure cylinder 35 has a fixed member (cylinder member 37) and a movable member (piston member 39). The piston member 39 is moved by a driving force applied thereto with respect to the cylinder member 37 and pushes (directly or indirectly) the rear end of the advancing / retreating member 33. In addition, the piston member 39 is not connected to members exposed to the space 107, including the advancing / retreating member 33, and can relatively move in a direction of separation from the rear end of the advancing / retreating member 33.

The hot-pressing die comprises a workbench, the top surface of the workbench is fixedly connected with a base table, a top frame is fixedly arranged over the workbench, and a pressing table is vertically arranged between the base table and the top frame in a sliding mode; in addition to the main hydraulic cylinder, pressure control of different areas is achieved through the multiple auxiliary pressing plates, in cooperation with the array pressure sensor in the lower die plate, in the whole hot pressing process, local pressure is finely adjusted, the overall surface pressure is uniform, and the hot pressing effect is improved; cooling is achieved through a first spraying head arranged in the lower die structure and a second spraying head arranged in the upper die structure, different from traditional flow channel type cooling, spraying impact is directly achieved on the back of the lower die plate and the back of the upper die plate, the extremely high local heat exchange coefficient is achieved through liquid flow impact, and the heat exchange efficiency is improved. And the jet liquid flow can carry away tiny bubbles generated by local high temperature, cooling failure caused by'air resistance 'is prevented, and the cooling efficiency is improved.

The invention relates to the technical field of intelligent manufacturing equipment, in particular to a mold cavity pressure homogenization precision control method and system based on a two-way closed loop, and the method comprises the following steps: based on an injection mold cavity, completing the sudden change recognition and compensation of pressure data, the dynamic switching of a master closed loop path and a slave closed loop path, and the discrimination of the synchronous adjustment state of a driver in sequence; and setting a gain adjustment action in stages, and implementing closed-loop correction according to a feedback trend to obtain a dynamic offset correction amount. According to the method, continuous correction of the pressure state is achieved by correlating multi-point pressure collection, judging the pressure sudden change position in the cavity in real time and dynamically compensating local abnormal data, the motion state of the propelling device is combined, pressure adjusting strategies are switched according to different process stages, a linkage gain adjusting and controlling mode is adopted, dynamic adjustment of pressure distribution keeps high collaboration, and the control effect is good. Periodic trend closed-loop correction is carried out on feedback signals in the driving response stage, and forming errors and product defects caused by abnormal local pressure are remarkably reduced.

The invention relates to the technical field of machining, and discloses a punching device for manufacturing an engine end cover, which comprises a workbench, a workpiece moving mechanism, a positioning and pressing mechanism, a punching mechanism and a cooling nozzle, the positioning and pressing mechanism comprises a base plate fixedly connected to the top end of the moving table, a pressing assembly used for pressing end cover raw materials, a transmission assembly used for positioning the end cover raw materials and a limiting top cover, the inner edge of the bottom end of the pressing assembly is in threaded connection with the outer edge of the top end of the base plate, and the inner edge of the bottom end of the pressing assembly is in threaded connection with the outer edge of the top end of the base plate through the transmission assembly; the end cover raw materials of different sizes and shapes are adapted, the universality and practicability of the device are improved, meanwhile, the clamping force of the movable rods which are distributed in the circumferential direction and move synchronously on the end cover raw materials is evenly distributed, damage to the end cover raw materials due to too large local pressure is avoided, and the surface quality of workpieces is protected; machining errors caused by vibration or displacement are effectively prevented, and the positioning precision can be improved.

The embodiment of the invention discloses a human body part recognition method, a mattress and a storage medium, and the method comprises the steps: obtaining the three-dimensional contour data of a human body on the mattress through a laser radar sensor, and extracting the two-dimensional projection coordinates of a human skeleton according to the three-dimensional contour data; the whole pressure distribution data of the mattress is obtained through a piezoelectric film sensor, multiple target areas are divided according to the whole pressure distribution data and the two-dimensional projection coordinates of the human skeleton, and the multiple target areas comprise a head area, a trunk area and a limb area; obtaining local pressure distribution data of a local area of each target area through an air pressure sensor, and obtaining a central point of each target area according to the local pressure distribution data; and according to the two-dimensional projection coordinates of the human skeleton and the central point of each target area, reconstructing each body part of the human body, and identifying the position of each body part of the human body on the mattress. By implementing the embodiment of the invention, the position of each part of the human body on the mattress can be accurately identified.

The invention relates to the technical field of warp knitting machines, in particular to a yarn tension control system of a warp knitting machine, which comprises an adjusting mechanism, the adjusting mechanism comprises a motor, the output end of the motor is rotatably connected with a first gear, the end face of the first gear is rotatably engaged with a second gear, and the surfaces of the first gear and the second gear are provided with first connecting rods; second connecting rods are rotatably connected to the surfaces of the first connecting rods, third connecting rods are rotatably connected to the surfaces of the second connecting rods, grooves are formed in the side walls of the mounting seats, springs are arranged on the bottom surfaces of the grooves, sliding seats are arranged at the top ends of the springs, and first yarn guide rollers are rotatably mounted on the side walls of the sliding seats. According to the yarn guide roller, the contact area is increased, the pressure on the area is reduced, abrasion and deformation of the yarn caused by too large local pressure are effectively reduced, after the contact area is increased, friction force between the yarn and the first yarn guide roller is distributed more evenly, and the problem of hairiness yarn breakage caused by too large local friction is avoided.

The invention relates to the technical field of force compensation, and discloses a force feedback adjusting system and an active compensation method, and the method comprises the steps: generating a target posture needed by a first target according to the pre-obtained data of the first target, and obtaining a target pressure through analyzing a mapping relation between the target posture and the stress condition of the first target; constructing a pressure thermodynamic diagram according to the first target stress data measured in real time; the target pressure is matched in the pressure thermodynamic diagram, a first adjustment area is recognized and adjusted, and the pressure thermodynamic diagram is updated according to the real-time stress data of the first target; according to a preset grid size, calculating a pressure gradient between adjacent grids in the updated pressure thermodynamic diagram, identifying a second adjustment area, and adjusting the second adjustment area by controlling the array movement in each grid; the spine posture can be adjusted, a reasonable angle can be kept, local pressure can be compensated, pressure sores are reduced, and safety and effectiveness in the operation process are improved.

The invention discloses a cleaning device for barnacles on the surface of a ship, and relates to the technical field of barnacle cleaning. The cleaning device for barnacles on the surface of the ship comprises a barnacle cleaning device body, and a polishing assembly, a shoveling assembly and a guiding-out assembly are installed on the outer side surface of a cleaning power assembly; according to the barnacle stripping device, the single-direction stress requirement is lowered through the effect of composite force through the inclined auxiliary knives on the outer sides of the perching knives, energy consumption and blade abrasion are reduced, the multiple perching knives reciprocate side by side, local pressure concentration is avoided through covering type cleaning, the arc-shaped bottom ends of the perching knives are attached to the curved surface of a ship body, and it is ensured that barnacles are thoroughly stripped; the barnacle cleaning device has the advantages that the barnacles can be cleaned by the barnacle cleaning device, accordingly, liquid can be blown, shoveled barnacles can be blown away from the bottom end of the barnacle cleaning device in real time, residues can be prevented from scattering back to a cleaning area due to movement or gravity of the barnacle cleaning device, cutting blades are matched with limiting ring grooves through limiting blocks, stable rotating tracks can be kept, the barnacle cleaning device automatically adapts to unevenness of the surfaces of hulls, and deflection or vibration caused by local jamming can be prevented.

The utility model relates to the technical field of anti-cavitation horizontal type thick slurry foam pumps, in particular to an anti-cavitation horizontal type thick slurry foam pump which comprises a base, an impeller cover is installed on the top of the base, a three-stage stepped impeller for preventing overlarge local pressure difference caused by instant pressurization of a single-stage impeller is installed in the impeller cover, and the three-stage stepped impeller is installed in the base. The top of the impeller cover is connected with a feeding pipe, and the feeding pipe is provided with a low-pressure-preventing mechanism which is used for preventing a low-pressure area from being generated due to the sudden change of the flow speed when thick slurry raw materials directly enter the impeller, the thick slurry foam is pre-accelerated and rectified through the spiral flow guide plate, and it is ensured that the pressure of a suction cavity is always higher than the saturated vapor pressure of liquid; and meanwhile, under the action of the three-stage stepped impeller, fluid is pressurized step by step, the situation that the local pressure difference is too large due to instant pressurization of a single-stage impeller is avoided, residual bubbles are guided to a low-pressure area through the final-stage pressure relief hole to be slowly released, bubble collapse impact is reduced, and therefore the cavitation prevention effect is achieved.

The invention belongs to the technical field of printing equipment, and provides a breadth-adjustable lifting type screen printing machine which comprises a supporting groove, and a placing table is mounted at the upper end of the supporting groove; the number of the lifting grooves is two, the two lifting grooves are oppositely installed at the upper end of the supporting groove, reciprocating threaded rods are rotatably installed in the two supporting grooves, lifting plates are slidably installed in the two lifting grooves, and threaded rings are arranged in the two lifting plates in a penetrating mode; lifting is achieved through cooperation of the reciprocating threaded rod and the threaded ring, so that lifting type printing operation of the printing screen frame and the screen body is achieved, compared with a traditional rotary printing screen frame and screen body, the screen body vertically acts on the surface of a printing stock through lifting, local pressure nonuniformity and pattern deformation caused by angle deviation during rotation can be avoided, and the printing quality is improved. Printed patterns are more accurate and clear, and the printing quality is improved. In the lifting process, the contact area and pressure of the net body and the printing stock are easy to control.

The utility model provides a substrate holding device and vapor phase growth equipment. The substrate holding device comprises a bearing base. The upper surface of the bearing base is provided with a groove for bearing a substrate, the top edge part of the bearing base is a peripheral protruding part, and an arc-shaped surface of which the curvature radius does not exceed 20mm is arranged between the side wall and the bottom surface of the peripheral protruding part; the bearing base is internally provided with an air channel, a first end opening of the air channel is located in the bottom face of the groove, a second end opening of the air channel is led out from the arc-shaped face, and due to the fact that the top edge of the bearing base is the peripheral protruding part, when air flows through a narrow area between the peripheral protruding part and the inner wall of the cavity, the flow speed is increased, and local pressure is increased; when the substrate is bent, a low-pressure area is generated near the arc-shaped surface, and then a remarkable negative pressure effect is generated in the air channel, so that the substrate is adsorbed on the bottom surface of the groove, the contact force between the substrate and the bottom surface of the groove is increased, and the substrate is prevented from warping and separating from the bottom surface of the groove.

The invention relates to the technical field of curved surface forming of fiber composite materials, in particular to a fiber composite material curved surface multi-point flexible gas-assisted hot pressing pressure control method and system.The method comprises the steps that the fiber direction is obtained by obtaining a design mold, and a deformation mismatching area is determined according to the fiber direction and the obtained airbag deformation direction; according to the method, a deformation mismatch area is obtained, a mismatch dynamic control network is constructed to carry out adaptive adjustment on the deformation mismatch area, local pressure compensation is carried out according to obtained adaptive adjustment feedback, and finally, the mismatch dynamic network is controlled by collecting a mold gap and a gap fitting standard. The problem of deformation mismatch caused by elasticity modulus difference in the primary and secondary directions of the fibers is effectively solved, and the direction and position accuracy of the fibers in the forming process is ensured through dynamic adaptive adjustment of a deformation mismatch area, so that the structural integrity and the mechanical property of a formed object are improved, the pressure can be more accurately controlled, and the production efficiency is improved. The requirements of complex mold curved surfaces and fiber layout are met, and the forming precision is improved.

The invention discloses an embedded structure for assembling a fusion device, a mounting method and a manufacturing method, and belongs to the technical field of fusion devices. In the pre-embedded structure for assembling the fusion device, the front surface of a first pre-embedded plate is used for being in contact with a bottom plate of a bracket assembly; the plurality of anti-shearing pieces are welded and fixed on the back surface of the first pre-embedded plate; the plurality of second pre-buried plates are arranged on one side of the back surface of the first pre-buried plate and are spaced from the first pre-buried plate; each stud assembly comprises a screw and nuts located at the two ends of the screw, the screws of the stud assemblies correspondingly penetrate through the first embedded plate and the second embedded plates respectively, and the nuts at the two ends of each screw are correspondingly located on one side of the front face of the first embedded plate and one side of the back face of the second embedded plate respectively. The embedded structure for assembling the fusion device is high in stability, bearing capacity and shearing resistance, the local pressure on the wall body and the wall surface can be reduced, and the bracket assembly is convenient to install.

The invention provides an intelligent pressure-reducing non-invasive mechanical ventilation mask based on a flexible pressure sensing technology, which comprises a mechanical ventilation mask, a display and alarm module and a mask state AI analysis system, and aims to solve the problem that the existing non-invasive mechanical ventilation mask is easy to cause pressure injury to the face of a patient in the use process. The flexible pressure sensing technology is combined with the non-invasive mechanical ventilation mask, the pressure magnitude and the pressure distribution condition of the mask and all contact parts of the face of a patient are accurately sensed, and a basis is provided for adjusting the mask wearing mode and pressure parameters; through pressure information fed back in real time, the wearing state of the mask is adjusted in time, pressure distribution is optimized, local pressure is prevented from being too high, and therefore pressure injury is effectively prevented. Flexible sensing and intelligent prevention are integrated, when it is monitored that the pressure exceeds a preset threshold value, the system automatically sends out an early warning prompt signal, meanwhile, prevention analysis is conducted according to the state of a patient, medical staff is reminded to adjust the face mask wearing state in time, and intelligent prevention is achieved.

The utility model discloses a hollow composite insulator convenient to install, and relates to the field of hollow composite insulator devices, the hollow composite insulator comprises a hollow composite insulator main body and a support frame, and the hollow composite insulator main body is fixedly installed at the top of the support frame through an installation assembly. According to the hollow composite insulator, the supporting plate is installed at the bottom of the hollow composite insulator body, the contact area between the bottom of the hollow composite insulator body and the supporting frame can be increased through the supporting plate, the force distribution can be more uniform by increasing the contact area between the hollow composite insulator body and the supporting frame, and the connection stability is enhanced; when the core rod is subjected to external force, the force can be better transmitted to the supporting frame through the supporting plate, the situation that local pressure of the hollow composite insulator body is too large can be reduced through the supporting plate, and deformation or damage caused by local stress concentration of the hollow composite insulator body and the supporting frame is avoided. And the strength of the hollow composite insulator after integral installation is improved.