175results about How to "Improve fatigue life" patented technology

The invention discloses a decoupling design method and system for reliability optimization of an angular contact ball bearing. The method comprises the following steps: determining initial design parameters of the angular contact ball bearing; constructing a reliability optimization design model which takes maximization of the rated dynamic load as a target and comprises probability reliability constraint processed by a penalty function; constructing a design variable and failure probability mapping agent model, specifically, identifying and quantifying uncertainty parameters, constructing a quasi-statics model and a limit state function, calculating the failure probability of a sample point through a probability reliability method, and training the agent model taking the design variable as input and the failure probability as output; and based on the proxy model, solving the reliability optimization design model by using an optimization algorithm, and outputting optimal bearing design parameters. According to the method, the reliability analysis process and the optimization iteration process are decoupled, so that the optimization efficiency is greatly improved while the design robustness is ensured.

The utility model belongs to bridge building technical field discloses a kind of bridge high bearing capacity node optimization structure, including H-shaped steel, H-shaped steel is connected with link steel by reinforcing bolt and reinforcing nut, first hinged seat is equipped on link steel, transverse I-beam is installed on link steel, second hinged seat is equipped on transverse I-beam;Link member is connected between first hinged seat and second hinged seat, link member includes core energy consumption section, transition section and elastic connecting section, first hinged seat, second hinged seat and link member form triangular force transmission mechanism, core energy consumption section is equal cross section steel plate, two end elastic connecting sections are connected with first hinged seat and second hinged seat, top angle angle of triangular force transmission mechanism is 45 °-60 °, and the axis of first hinged seat and H-shaped steel web center line present 10 °-15 ° angle of inclusion.The utility model not only can realize the multidirectional transmission of node area force, but also can avoid the stiffness mutation problem caused by traditional welding, and can inhibit the expansion of microcrack.

The utility model relates to memory alloy driver technical field, especially a kind of big-stroke grid piece driver driven by using memory alloy driving wire, it is applicable to lock. The parallel mutual superposition mode of insulating driving piece and multiple memory alloy driving wires, make full use of length-width direction space, increase the effective total length of memory alloy driving wire simultaneously, to increase its contraction stroke, and each memory alloy driving wire is in straightened state, no bending, can improve fatigue life, make it to small size, action stroke is big, fatigue performance is good, the utility model can be applied in miniature lock and other scenes, lock cylinder is driven by using driver action, to achieve the purpose of unlocking.

A loader frame articulation structure, belonging to the field of engineering machinery, includes a front frame and a rear frame, connected by an articulation assembly. The articulation assembly includes an articulation shaft, which is fixedly mounted on the front frame, and the rear frame is rotatably connected to the articulation shaft. The articulation shaft includes a cylindrical portion and a truncated cone portion. The truncated cone portion is fixedly mounted on the upper end of the cylindrical portion and installed within an articulation hole in the front frame. A mounting plate is mounted on the upper end of the truncated cone portion, and the mounting plate is fixedly connected to the front frame by bolts. The cylindrical portion is rotatably connected to the rear frame, and the lower end of the cylindrical portion is connected to the articulation hole on the front frame via a bushing. The use of a conical surface fit at the loader's articulation structure significantly improves the assembly accuracy and connection strength at the articulation point, thereby solving the connection strength problem at the articulation point under extreme working conditions and the fatigue wear problem caused by the increasing use time of the loader, effectively reducing the failure rate of the loader product.

The application relates to the technical field of wind power generation, and discloses a wind turbine design method adopting a frictional tuned mass damper, which adds a frictional tuned mass damper to a man platform in a tower drum of a wind turbine, establishes a motion equation of the wind turbine after adding the frictional tuned mass damper based on a structural dynamics principle, deduces a mathematical analytic expression of a system dynamic coefficient, and obtains parameters of the frictional tuned mass damper through a system optimization theory. The application solves the problems that the prior art is difficult to realize damping through the tuned mass damper in the narrow space in the cabin or the tower drum, and the damping control effect is poor.

This utility model relates to the field of materials processing technology, and in particular to a high-strength, high-precision, low-density composite profile with an arc surface; it includes a hollow profile structure and a solid profile structure, which are bonded together by a mortise and tenon structure to form an alternating continuous profile structure; the hollow profile structure has an extruded arc-shaped hollow outer wall, filled with glass microspheres, and mortise and tenon grooves and overlapping surfaces at both ends; the solid profile structure has an arc-shaped solid body, with mortise and tenon blocks and overlapping grooves at the ends that match the trapezoidal mortise and tenon grooves. This composite profile, through the alternating splicing design of the hollow and solid profile structures combined with the trapezoidal interlocking structure of the mortise and tenon grooves and blocks, significantly improves the connection reliability and assembly efficiency.

A wind turbine blade made of basalt carbon fiber composite variable density material combination, including at least one blade unit assembled along the length direction of the blade, the density gradient increases from the blade tip to the blade root through the gradient distribution of material density and / or the gradient distribution of hollow structure, and adjacent blade units are detachably connected through non-threaded connection structure. The modular design of the blade solves the problem of land transportation of oversized blades, and the non-threaded connection (hand disassembly) improves the efficiency of on-site installation and eliminates the risk of thread loosening. Lightweight blade tip reduces starting torque, facilitates handling and assembly, and improves wind speed and power generation efficiency.

This invention discloses a long-life pavement material for extreme and complex conditions and its preparation method. Modified asphalt pavement material is prepared using ultra-deeply decrosslinked rubber as the main raw material (with a content greater than 50%). Through specific processes and formulations, this pavement material retains excellent self-healing properties even under extreme low-temperature conditions (< -10 °C), with a healing efficiency greater than 50%, and a healing efficiency greater than 30% after aging, resulting in a long service life. This invention not only solves the problem of easy cracking in asphalt pavements and significantly improves their service life, but also enables the high-value resource utilization of waste rubber, resulting in significant environmental and economic benefits.

The invention relates to the technical field of batteries, in particular to a composite buffer structure for a battery and a preparation method and application thereof. A composite buffer structure for a battery comprises a polymer matrix layer and a reinforcement phase located in the polymer matrix layer, the reinforcement phase comprises a shape memory alloy fiber layer, and the shape memory alloy fiber layer is of a three-dimensional network structure; and the volume fraction of the shape memory alloy fiber layer in the composite buffer structure for the battery is 10%-60%. According to the composite buffer structure for the battery, the polymer matrix layer serves as a continuous phase, the shape memory alloy fiber layer serves as a reinforcing phase, and the polymer matrix layer and the shape memory alloy fiber layer are mutually staggered in the polymer matrix layer to form a three-dimensional network structure; the shape memory alloy fiber layer with a proper volume fraction is adopted, can actively adapt to the volume change of a battery cell, shows superelasticity at the working temperature of the battery, provides high and stable recovery stress, and is excellent in fatigue resistance, so that long-term stable contact of a battery interface is effectively maintained.

This invention belongs to the field of metal welding technology and relates to a heat treatment method for hypereutectoid rail steel after flash welding, comprising the following steps: post-weld cooling: the welded joint is allowed to cool naturally in air after flash welding; normalizing treatment: the welded joint is heated to a normalizing temperature above the austenitizing temperature and held at that temperature; controlled cooling: the temperature of the weld heat-affected zone of the welded joint is cooled from the normalizing temperature to the isothermal transformation temperature within the pearlite phase transformation temperature range at a first cooling rate, held at that temperature until the austenite undergoes pearlite transformation, and then the welded joint is cooled from the isothermal transformation temperature to below 200°C at a second cooling rate lower than the first cooling rate. The method of this invention can effectively eliminate the network cementite structure in the flash welding heat-affected zone, while avoiding the introduction of harmful structures such as martensite or bainite, ensuring that the microstructure of the weld heat-affected zone is pearlite with fine lamellar spacing.

This invention provides a high-parameter SiC / SiC ceramic matrix composite material, relating to the field of aerospace high-temperature structural materials. This high-parameter SiC / SiC ceramic matrix composite material is composed of a SiC fiber preform, an interface phase, and a SiC matrix; the interface phase is a BN layer or a PyC+BN composite gradient layer; the SiC fiber preform adopts a 3D orthogonal braided or needle-punched structure, with a fiber volume fraction of 45%–55%; the SiC matrix is ​​prepared by a CVI+PIP composite process, with a matrix porosity ≤5%. The preparation method includes four main steps: SiC fiber preform preparation, interface phase deposition, SiC matrix densification, and environmental barrier coating. By optimizing the preform braiding structure, interface phase type, and matrix composition, combined with specific preparation processes, the composite material meets the requirements of high mechanical properties, high high-temperature oxidation resistance, high density, and high thermal conductivity. This preparation method, through CVI+PIP composite process optimization, nano-dispersed phase addition, and gradient interface phase design, overcomes existing process bottlenecks and achieves the industrial-scale preparation of high-performance composite materials.

The utility model discloses a rotor bow based on NURBS type double curvature variable cross section type line belongs to steel wire rope manufacturing equipment rotor part technical field, and this rotor bow main part is NURBS type double curvature bending section, and the cross section width is gradually increased from the center to both ends along the length direction, each section is composed of elliptical streamline, intermediate horizontal line section and upper three point arc line compound, and the smooth continuous axial symmetry profile is formed. The main body both ends pass through lofting stretching transition section and equal cross section end portion fairing link. Through the coupling design of variable cross section geometry and double curvature bending structure, improve high -speed rotation dynamic balance, restrain eddy current and flutter, reduce vibration noise and optimize stress distribution, thereby promote the working stability of stranding machine and steel wire rope stranding quality.

This invention relates to a teardrop-shaped chip divider for precision broaching of tenon grooves in aero-engines, belonging to the field of aero-engine manufacturing technology. The chip divider features a smooth contour composed of arcs and straight lines within a specific range, and is tangentially connected to the back face of the cutting teeth. This results in a large, smooth, streamlined cross-section without sharp points, effectively solving the industry problem of sharp-cornered chip dividers scratching the machined surface of the workpiece during precision broaching. While ensuring chip breaking and chip separation functions, it significantly improves the surface roughness quality of the tenon groove. It is suitable for precision broaching of high-requirement parts such as compressor discs and fan discs, improving blade machining efficiency.

A parallel and V-shaped 12-channel high-performance assembly comprises an intermediate shaft (1), a first universal joint (2) is arranged at one end of the intermediate shaft, a second universal joint (3) is arranged at the other end of the intermediate shaft, and the problems that a traditional VL joint product is large in channel contact stress, high in channel abrasion speed and large in later vibration sounding risk are mainly solved. The utility model provides a 12-channel high-performance assembly which is parallel to each other and is arranged in a V shape, the 12-channel design is adopted, the contact stress between the channels and steel balls can be effectively reduced, the contact stress of the channels of the product is reduced by 70% under the condition that loads with the same torque are transmitted, and the fatigue life of the assembly can be effectively prolonged; and meanwhile, the V-shaped structural design of 3-12 degrees is adopted, the jamming phenomenon caused when the swing angle of the driving shaft is close to the limit can be effectively avoided, the vibration and sounding phenomenon of the assembly is reduced, and the driving experience is effectively improved.

The utility model relates to power motor technical field, especially a wheel hub motor, including fixed main shaft, output motor, transmission assembly, output box and wheel hub rubber, be provided with the accommodation cavity in the output box, the output motor sets up in the accommodation cavity, transmission assembly sets up in the accommodation cavity and is connected with the output end of output motor, be provided with transmission connecting ring in the accommodation cavity, transmission connecting ring is connected with transmission assembly, the output motor is used for driving transmission assembly transmission to drive output box rotation, fixed main shaft sets up at the axle center department of output box, and passes through output motor and transmission assembly in proper order, wheel hub rubber sets up at the outside of output box, the utility model has obvious technical advantage in reliable transmission, high degree of integration, environmental protection, maintenance convenient and production controllability etc.

The present application relates to quenching technical field, especially a kind of continuous high-frequency quenching device.Its technical scheme includes: double-channel cooling cover, it is composed of two cover bodies that are distributed and fixed in support, cover body is opened with several tooth top grooves along the advancing direction of drill rod, several tooth top grooves are distributed in spiral, the helix angle of tooth top groove and the helix angle of drill rod threaded portion are consistent, movable arc-shaped baffle is arranged in tooth top groove, the distance between adjacent tooth top grooves and the pitch of drill rod threaded portion are consistent.The present application separates the threaded portion of drill rod into tooth top and tooth bottom in the way of cooling, thereby reducing the deformation of the whole thread, improving the dimensional accuracy and shape accuracy of thread, and the organization transformation of tooth top and tooth bottom is more uniform, reducing the generation of internal residual stress, the reduction of residual stress can effectively improve the fatigue life of thread, under the same working conditions, the fatigue life of drill rod thread cooled by the present device can be improved compared with traditional way.

The utility model discloses a clamping end for printing equipment, which relates to the technical field of film production, and comprises a first cylinder part, a second cylinder part and a first transition frustum, and the first cylinder part is used for being assembled in a clamping system; the diameter of the second cylindrical part is smaller than that of the first cylindrical part; the first transition frustum is coaxially arranged between the first cylindrical part and the second cylindrical part, the large-diameter end of the first transition frustum is connected with the first cylindrical part, the small-diameter end of the first transition frustum is connected with the second cylindrical part, and the first cylindrical part, the first transition frustum and the second cylindrical part are jointly combined to form a first-step insertion table. According to the clamping end, the stepped inserting table design is adopted, the first transition frustum is arranged between the first cylindrical part and the second cylindrical part, the second transition frustum with the smaller taper is arranged between the second cylindrical part and the third cylindrical part, and a two-stage gradual change structure is formed. By means of the design, the cylinders of different sizes can be installed and borne, and the application range of the clamping end is widened.

This invention provides a synchronous welding device for double-sided weld corners, relating to the field of welding equipment technology. The device includes a welding torch, a beam fixed to a vehicle body, and at least two swing arms. The swing arms are rotatably connected to the beam in the horizontal direction. At least two opposing swing arms form a group, with the welding torch located on one of the swing arms. The two welding torches in the same group are used for welding the opposite sides of the weld corner. At least one of the two swing arms in the same group is inclined along the axis of the vehicle body, and the horizontal linear distance between the two swing arms gradually decreases along the welding travel direction. A guide wheel is provided at the bottom of the swing arm, inclined relative to the axis of the vehicle body. When the vehicle body travels within the component along the welding direction, the guide wheel pulls the swing arm towards the welding position, so that the wire exit position of the welding torch is in contact with the weld. This device can solve the problems of synchronous welding on both sides of the component and inaccurate weld tracking, improving welding efficiency and weld quality stability.

The application discloses a kind of public building maintenance reinforcing steel beam installation method, comprising the following steps: step one, install comb-tooth steel plate on the surface of original structure beam, form original structure beam reformation piece;Step two, the middle part of steel beam is sent and lifted using steel beam installation trolley, and the installation position of the end of steel beam and the end of original structure beam reformation piece at both ends is opposite;Step three, connecting steel plate is welded at both ends of steel beam, and connecting steel plate is fixed with original structure beam reformation piece by anchor bolt.The present application ensures that steel beam can be safely and orderly during installation, prevents falling safety risk during steel beam lifting, and improves the quality of the whole beam after reinforcement.

The invention relates to the technical field of energy accumulators, in particular to a pressure conversion hydraulic mechanism energy accumulator which comprises a supporting cylinder and an air bag installed in the supporting cylinder, and an oil inlet valve is installed on the supporting cylinder; a plurality of anti-friction pieces for reducing friction are mounted on the air bag; an oil inlet assembly capable of conveying hydraulic oil is installed on the supporting cylinder. By arranging the anti-friction piece with the balls on the periphery of the air bag and combining the anti-tearing reinforcing structure at the lower end of the air bag, contact between the air bag and the supporting cylinder is changed from surface contact sliding friction to multi-point rolling supporting, and the abrasion and tearing risks of the air bag are remarkably reduced; by means of a variable pressure supporting mechanism formed by the oil inlet assembly, the blocking piece, the connecting piece and the supporting piece, when the air bag moves towards the oil inlet valve, flexible blocking can be achieved, gas buffering and jacking supporting force can be synchronously established, hard contact and excessive deformation of the air bag and the oil inlet valve are avoided, and therefore the working safety of the energy accumulator is improved, and the service life of the energy accumulator is prolonged.

The pipe joint comprises an upper portion, a middle portion and a lower portion, and the upper portion, the middle portion and the lower portion jointly form a through circulation channel. An annular insertion block is arranged on the top face of the upper portion, a circle of platform is arranged on the periphery of the annular insertion block, a sunken solder groove is formed in the side, close to the annular insertion block, of the surface of the platform, and dual positioning of the annular insertion block and the platform facilitates reduction of welding alignment errors. A plurality of through screw holes are formed in the lower part; the outer diameter of the cylindrical structure where the first vertical face is located is larger than the outer diameter of the middle portion and smaller than the outer diameter of the lower portion, the middle portion is concave inwards relative to the upper portion and the lower portion, and the concave structure of the middle portion serves as a thermal expansion buffer area and is matched with smooth transition of the first inclined face, so that the welding thermal stress concentration coefficient can be effectively reduced, thermal deformation is reduced, and the welding seam cracking rate is reduced. According to the pipe joint for the plate heat exchanger, through the stepped axial structure, a multi-stage positioning reference and stress dispersion system is formed, and the comprehensive performance of the pipe joint can be remarkably improved.

The utility model provides a kind of double contact head antenna radio frequency spring, comprising: elastic block.The kind of double contact head antenna radio frequency spring, by being provided with elastic block, right spring and left spring and the structure such as etc., multiple optimization of structural stability, contact reliability and adaptive flexibility is realized, elastic block provides stable support and double elastic buffer for entirety, its split type elastic arm design takes into account rigidity and elasticity, prolongs product fatigue life;Right spring and left spring rely on different direction elastic compression force and stretching contact point process, accurately match multidirectional circuit contact demand, ensure that connection is uninterrupted;Synergistic effect of three, both realize the functional requirement of the simultaneous connection of multiple circuits, and avoid poor contact or structural damage through the elastic complementation and stable support between structures, comprehensively guarantee the efficiency and durability of antenna radio frequency connection, adapt complex circuit use scene.

The utility model discloses a high -strength tee bend pipe fitting relates to tee bend pipe fitting technical field, this high -strength tee bend pipe fitting, including the main pipe body and the pipe body of the perpendicular main pipe body axis setting, the pipe body and the main pipe body's junction area are equipped with the composite reinforcing rib, the pipe body middle wall thickness is greater than two end wall thickness, the main pipe body junction area wall thickness is greater than end wall thickness, the composite reinforcing rib includes radial reinforcing rib, axial reinforcing rib and transition reinforcing rib, the inner wall middle part of pipe body is equipped with the flow guide block in the position department of main pipe body, the utility model discloses a composite reinforcing structure is set up in the junction area of stress concentration, and the junction area wall thickness increases, and the flow guide block divides main pipe body fluid, and acts as internal support structure and external composite reinforcing rib together, forms the composite strengthening system of inside supporting outside hoop, and the anti -deformation ability and fatigue life of pipe fitting under high pressure working condition are improved significantly.

The utility model relates to a hydraulic system control switch technical field, especially a kind of pilot cut-off switch, rotating shaft one end passes through shaft seat, rotating damper and rotating shaft use keyway connection to be circumferentially fixed, rotating shaft one end is connected with pilot cut-off rod, the other end is connected with tension spring, by the pilot cut-off rod of front and back and drive to make rotating shaft rotate to open and close pilot valve, the other end of rotating shaft is connected with tension spring, through specific angle arrangement, provide power assistance in the rear half course of the rotation of shaft two directions, and provide stable locking force after reaching limit, ensure that not because equipment vibration leads to switch state change.In the process of rotation, under the tension of tension spring, the rotating speed of rotating shaft is constantly improved, at this time, rotating damper will provide reverse rotating torque according to the rotating speed of rotor, avoid the rotating speed of rotating shaft too fast and occur violent collision and vibration at limit point.

The invention discloses a tank-type direct drinking water filtering system, which relates to the field of direct drinking water filtering, and comprises a raw water tank, a pretreatment filter, a digital high-pressure pump, a nanofiltration membrane assembly, an ozone ultraviolet sterilization device, a digital water tank, a user direct drinking faucet, a return water filter and a return water adjusting mechanism arranged on a return water pipeline, a fluid dynamic pressure balance control center is integrated in the digital high-pressure pump, a fluid dynamic fingerprint spectrum is constructed by extracting characteristics representing the backwater and inflow game state from original pressure data of a pump inlet, the fluid dynamic fingerprint spectrum is decoded to quantify the physical invasion degree of backwater jet flow, and a backpressure retardation index is obtained. And performing control law optimization calculation on the backpressure retardation index, resolving a pump speed dynamic compensation vector and a backwater damping adjustment coefficient, and converting the pump speed dynamic compensation vector and the backwater damping adjustment coefficient into entity actions of fluid machinery, so that the risk of pipeline howling and flow field separation caused by a ghost water hammer is thoroughly eradicated.

The application discloses a kind of steel structural member automation welding positioning tool and operation method, belong to welding processing technical field, using sectional time sequence release force clamping structure, along the length direction of weld interval arrangement multiple independent clamping units, with lateral positioning reference component jointly form the bidirectional positioning constraint of workpiece width direction;Matched with welding gun synchronous movement linkage trigger mechanism output pneumatic trigger signal, so that welding heat-affected zone keeps rated clamping force to guarantee positioning accuracy.The application adopts the above-mentioned steel structural member automation welding positioning tool and operation method, can reduce weld residual tensile stress peak value under the premise of guaranteeing weld lateral misalignment amount ≤0.3mm, component lateral bending deformation is reduced;Pure pneumatic control is used throughout, and the ability to resist welding spatter, high-temperature thermal radiation and electromagnetic interference is strong, suitable for H-shaped steel, box girder and other long strip-shaped steel structural member automatic assembly welding.

The invention discloses a low-cost H340-grade high-strength steel rail smelting method based on rare earth treatment and cooperative control under continuous casting soft reduction, which comprises the following steps: 1) optimization of mass percent component design: on the basis of a low-vanadium high-manganese component system, introducing rare earth elements to form a Mn / V / RE multi-element cooperative strengthening mechanism; (2) controlling a continuous casting process; 3) adding and treating rare earth; and (4) other key procedures are accurately regulated and controlled. The invention aims to provide the low-cost H340-grade high-strength steel rail smelting method based on rare earth treatment and cooperative control under continuous casting soft reduction, and unification of high strength, high toughness and low cost of the steel rail is realized by optimizing a component system (introducing rare earth) and cooperatively and accurately regulating and controlling a continuous casting process.

The utility model relates to carbon fiber half shaft joint technical field, concretely is a kind of three-section type hexagonal metal joint for carbon fiber half shaft, including connecting end, transition reinforcing section and joint assembly, the transition reinforcing section is arranged between connecting end and joint assembly and the both ends of transition reinforcing section are respectively fixedly connected with connecting end and joint assembly, the connecting end, transition reinforcing section and joint assembly integrated molding are formed.The application adopts the technical scheme of three-section type regular hexagonal metal joint, and reliable connection of carbon fiber hollow half shaft and titanium alloy transmission end is realized by integrated molding mode;The core of the scheme lies in the synergistic cooperation of three-section structure layout and regular hexagonal cross section design, combined with the optimized nail connection configuration, while ensuring lightweight, significantly improve the torsional properties and reliability of joint.

The application discloses a kind of photovoltaic welding band and preparation method thereof, belong to photovoltaic material technical field.The method includes: in-situ chemical reduction preparation silver coating five silver nanometer reinforcing agent, silver nanoparticle uniform load forms core-shell structure;Ultrasonic-assisted smelting Sn-Bi-Ag-Cu quaternary solder master alloy;Copper band microetching forms Ra0.35-0.55 μm porous structure;Silane bridging hot-dip plating, control solder layer thickness 18-22 μm, staged cooling.Compared with prior art, the welding band tensile strength of the application is improved, the solder joint shear force is improved, the wet heat aging retention rate is in high position, the interface hole rate is reduced, the reliability and welding performance are significantly improved, and is suitable for high-efficiency photovoltaic module.