48results about How to "Guaranteed fatigue life" patented technology

The invention discloses a stabilizing device, a floating foundation and an offshore wind power generator. The stabilizing device comprises a U-shaped water chamber, wherein the U-shaped water chamber comprises a first hollow upright column, a second hollow upright column and a bottom buoyancy tank connected between the bottoms of the two upright columns, the first upright column and the second upright columns are communicated with the bottom buoyancy tank, and the top of the first upright column and the top of the second upright column are communicated through an air communication pipeline. The floating foundation is at least provided with a first upright column, a second upright column and a third upright column, and comprises at least one stabilizing device. The offshore wind power generator comprises the floating foundation, a mooring rope, a tower, vanes and a wind power generator set, wherein the mooring rope is connected with the outer edge of the floating foundation and is anchored to the seabed, the bottom end of the tower is arranged on the floating foundation, and the vanes and the wind power generator set are arranged on the top of the tower. By means of the stabilizing device, stabilizing of a floating fan can be simply and effectively achieved through a double-resonance principle.

The invention discloses a floating fan base with flare type tension legs, a marine wind-driven generator and a construction method. The floating fan base comprises a top supporting platform, a bottom supporting structure, at least three hollow stand columns and a ballast regulating system, wherein the top supporting platform is used for supporting a pylon, blades and a wind-driven generator set; the bottom supporting structure is connected with multiple tension legs; the top supporting platform is connected with the bottom supporting structure via the hollow stand columns, the hollow stand columns are arranged around the vertical center line of the floating fan base, and each stand column inclines outwards from a lower end to an upper end relative to the vertical center line of the floating fan base; the ballast regulating system is arranged in the stand columns and / or the bottom supporting structure. The marine wind-driven generator of the base with the structure has excellent movement performance, integral wet towing can be performed, and the floating fan base and the marine wind-driven generator are convenient to manufacture, assemble and mount.

The invention discloses a machining technology for a gear shaft. The machining technology is characterized by including the following technological processes of material preparing, forging, normalizing, rough machining and semi-finishing machining, thermal refining, carburizing treatment, finish machining tooth grinding and checking and storage. According to the machining technology for the gear shaft, cracks and abrasion can be reduced, and the fatigue life can be prolonged.

The invention designs low-cost high-temperature carburizing steel for a high-temperature carburizing environment with a temperature higher than 1000 DEG C. The low-cost high-temperature carburizing steel consists of the following chemical components in percentage by weight: 0.16-0.20% of C, less than or equal to 0.04% of Si, 0.75-0.90% of Mn, 1.15-1.25% of Cr, 0.20-0.30% of Mo, 0.040-0.050% of Al,0.0120-0.0180% of N, less than or equal to 0.025% of P, 0.015-0.025% of S, less than or equal to 0.0010% of O and the balance of Fe and inevitable impurities. An Al / N ratio is controlled to be 2.0-4.0, Si content is controlled to be relatively low, and a deoxidation process in steelmaking and a stopper rod curve control process in continuous casting are combined, so that large-scale production and continuous casting can be realized, extra process treatment does not need to perform before high-temperature carburizing, a steel structure before carburizing does not need to strictly control and the process is greatly simplified. Grade of a B-class rough system, fine system impurities and Ds impurities of high-temperature carburizing steel is lower than 0.5, carburizing can be simulated for 2-6 hours at a temperature of 1000-1030 DEG C and mixed crystal is avoided. The carburizing steel can be effectively guaranteed in fatigue life after being applied to parts such as a gear.

The invention provides a building structural foundation with three-dimensional shock insulation and vibration attenuation. The building structural foundation with three-dimensional shock insulation and vibration attenuation mainly comprises a steel structural small platform laid the roots in a foundation, a shock absorber mounting sliding table and an elastic damping shock absorber, wherein a polytetrafluoroethylene based coating is prepared on the steel structural small platform; a self-lubricating composite material containing oil is adopted in the shock absorber mounting sliding table to beused as a sliding friction pair; according to the elastic damping shock absorber, disc spring support is adopted on the lower surface of a main piston, a liquid damping medium below a floating pistonhas low internal pressure in a static state, and the shock absorber works stably for a long time and no oil leakage occurs; an upper mounting joint and a lower mounting joint of the shock absorber have a slight cardan joint adjusting function; when an earthquake happens, the steel structural small platform vibrates with small amplitude following the foundation under the influence of earthquake waves, the mounting sliding table, the shock absorber on the upper part of the mounting sliding table and a building slide relatively on the steel structural small platform, so that earthquake energy inthe horizontal direction is weakened and input to the building on the upper surface; and the shock absorber has damping and energy absorption functions in the vertical direction, and thus, three dimensions have shock insulation and vibration attenuation protection action.

The invention relates to a device of rotor with jaw dry-type vacuum pump. Between the axle hole and ectotheca distributing strengthening rib according to circle. Base on confirming the strength and fatigue life. The weight of rotor wide-range reduced at 1 / 2 to 1 / 3 of the past. The consumption of material reduced effective. Because of light weight, the rotor's operation cost less electric energy. The loading and deforming are lightness, make the operating life longer. Strengthening rib make process time of dynamic balance wide-range shorten, and confirm the balance better. The design make commercial batch process has great value in use and huge potentiality.

The invention relates to a dynamic compactor boom and a dynamic compactor. The dynamic compactor boom comprises a bottom knuckle arm, a plurality of middle knuckle arms and a top knuckle arm, wherein the bottom knuckle arm, the middle knuckle arms and the top knuckle arm are sequentially connected in series and are respectively knuckle arms with a trussed structure mainly composed of an upper main chord member, a lower main chord member, a diagonal web member and a transverse connecting rod, and the knuckle arms are connected with each other through pin shafts; the cross section area of the dynamic compactor boom is homogeneously and linearly increased from the top knuckle arm to the bottom knuckle arm. The vibration and fatigue problems of large-energy-level dynamic compactors of the prior art can be improved, and meanwhile the processing technology and the disassembly and assembly problem of the boom can be considered.

The invention discloses an integrated multi-degree-of-freedom rigid-flexible coupling motion platform driven by a ball screw. The platform comprises an X-axis frame and a first flexible hinge platform, wherein the X-axis frame is externally connected with the power output end of a Y-axis driving device of a Y-axis frame, the side face of the first flexible hinge platform in the X-axis direction isconnected to the X-axis frame through a flexible hinge, the side face of the first flexible hinge platform in the Y-axis direction is installed on the X-axis frame through a spring piece type flexible hinge, and the corresponding first flexible hinge platform is arranged on each guide rail of the Y axis to isolate the influence of friction of the guide rails. According to the platform, the X-axisframe and an X-direction platform base are integrally machined and manufactured, other platform assemblies are directly installed on the X-direction platform base, an integrated two-degree-of-freedomplatform structure is adopted, a two-layer overlapping structure is avoided, the material cost is saved, and the gravity center of the whole platform is lowered.

The invention relates to a red mud-based asphalt mixture warm-mixing agent and a preparation method thereof, and belongs to the technical field of asphalt warm-mixing agents. The preparation method comprises the following steps: step 1) calcining red mud powder and then mixing with an active aluminum silicon source in proportion, and allocating the molar ratio of SiO2 / Al2O3 to obtain a geopolymerprecursor; step 2) adding the geopolymer precursor obtained in the step 1) into an alkaline activator solution, and stirring to obtain geopolymer mud; step 3) curing the geopolymer mud obtained in thestep 2) to obtain a geopolymer block, and preparing the geopolymer block into powder; and step 4) adding the geopolymer powder obtained in the step 3) into a surfactant solution, stirring uniformly,and then suction-filtering and drying the obtained slurry to obtain the red mud-based asphalt mixture warm-mixing agent. According to the invention, the asphalt mixture warm-mixing agent is prepared by surface modification of red mud-based geopolymer powder, thereby effectively ensuring mechanical properties of an asphalt mixture while significantly reducing a mixing temperature and a molding temperature of the asphalt mixture.

The invention relates to a quick-coupling quick-disassembling joint of a pipe fitting. The quick-coupling quick-disassembling joint of the pipe fitting comprises an external seat, an internal plug and a sliding element, wherein the internal plug is movably arranged in the external seat and in sealing connection with the external seat through a sealing element, and the sliding sleeve for the passing of the internal plug is movably matched in the external seat; an annular boss is arranged on the outer side wall on the front part of the internal plug; at least two cantilevers are formed on the side wall of the external seat and compressed towards the external seat from top to bottom; the inner diameter formed by the surrounding of the lower ends of the cantilevers is less than the outer diameter of the annular boss of the internal plug; an opening is formed in the side wall of the external seat at the lower end of the cantilever; the distance between the lower end of the opening and the lower end surface of the cantilever is slightly greater than the height of the annular boss; the upper part of the sliding sleeve protrudes out of the external seat; and convex legs are arranged on the lower part corresponding to the cantilevers. The pipe fitting can be rapidly coupled when the annular boss is clamped by the cantilevers, and can be rapidly disassembled when the cantilevers are extruded by the sliding sleeve. The quick-coupling quick-disassembling joint is simple and compact in structure, the inner plug is prevented from shifting up and down in the external seat due to a result of the variation of water pressure, and the fatigue life of the joint is ensured.

The invention discloses an AMT (Automatic Mechanical Transmission) synchronizer fatigue life testing method and a test bench for realizing the method, belonging to the technical field of automobile transmission. The testing method is characterized in that quite many times of gear shifting tests are performed on two gears of all conventional gear shifting of an AMT synchronizer to be tested, and the fatigue life of the AMT synchronizer is judged according to the state of an AMT to be tested in the entire testing process. The test bench comprises a control cabinet, a variable-speed motor, a synchronizing belt, a transmission shaft, a computer, an automatic transmission control unit installation base and a to-be-tested AMT installation base. By adopting the technical scheme provided by the invention, the AMT synchronizer fatigue life testing method and the test bench for realizing the method have the advantages that the technical scheme is simple and easy to implement, the fatigue life of the synchronizer of the AMT of an automobile is proved, the synchronizer is enabled to meet the requirement on the life of the AMT of the automobile, the reliability of the synchronizer is guaranteed and the blank of the AMT synchronizer fatigue life testing method is filled.

The invention discloses a long-service-life high-temperature-resistant textile motor bearing, and belongs to the technical field of high-precision special bearing manufacturing. The long-service-lifehigh-temperature-resistant textile motor bearing is improved in the four aspects of technical design, manufacturing process, bearing lubricating grease selection and bearing manufacturing material, the service life of the improved bearing can be obviously prolonged, and the improved bearing is wear-resistant and high-temperature-resistant. According to the long-service-life high-temperature-resistant textile motor bearing, the working clearance Gr of the bearing is scientifically designed; the mounting clearance and the change clearance of inner and outer rings caused by temperature change areconsidered; and the problems that when the maximum rolling body load of a bearing raceway bearing region is increased during working operation, friction torque and temperature rise are increased dueto clearance change caused by elastic deformation and the bearing adhesion or damage due to fatigue occur too early are mainly solved, so that the service life of the bearing is greatly prolonged.

The invention discloses steel for a front axle of a medium-sized truck and a production method of the steel. The steel comprises the following chemical components including, by weight, 0.39% to 0.43% of C, 0.20% to 0.37% of Si, 0.65% to 0.80% of Mn, 0.95% to 1.10% of Cr, 0.01% to 0.05% of Mo, 0.02% to 0.03% of Ni, 0.02% to 0.05% of Cu, less than or equal to 0.020% of P, 0.010% to 0.025% of S, 0.010% to 0.040% of Alt and the balance Fe and other inevitable impurities, so that the contents of Mo, Ni and Cu in the steel meet the condition that the sum of Mo, Ni and Cu is more than or equal to the sum of 0.013C, 0.033Mn and 0.034Cr and less than or equal to the sum of 0.018C, 0.026Mn and 0.065 Cr. According to the steel for the front axle of the medium-sized truck and the production method of the steel, the contents of Mo, Ni, Cu and other elements in the steel are accurately controlled, steel grains are refined, the impact toughness of the steel is improved, and the fatigue life of the automobile front axle is prolonged.

The invention discloses a heat treatment method of a steel rail welding joint, and belongs to the technical field of steel rail welding. The heat treatment method solves the technical problems of saddle-shaped abrasion and early fatigue fracture of the rail welding joint caused by low hardness of a welding area or abnormal microstructure of the joint in the service process of a steel rail; and themethod is the heat treatment method of a rail flash welding joint. According to the method, the rail welding joint is sequentially subjected to a first cooling stage, a second cooling stage and a third cooling stage, and the cooling speed and temperature of each stage are controlled, therefore, the percentage content of the metallographic structure of the steel rail welding joint is less than orequal to 1.0%, the saddle-shaped abrasion and early fatigue fracture of the the steel rail welding joint caused by the low hardness of the welding area or abnormal microstructure of the welding jointin the service process of the steel rail are improved, and the fatigue life of the steel rail welding joint reaches more than 2.8 million times.

The invention discloses a curved surface type variable thickness sealing plate for an aircraft movable airfoil and a design method of the curved surface type variable thickness sealing plate. The sealing plate comprises a sealing plate rigid part and a sealing plate flexible part; the sealing plate rigid part is fixedly connected onto a fixing airfoil; one end of the sealing plate rigid part is fixedly connected with a head end of the sealing plate flexible part; a tail end of the sealing plate flexible part is overlapped on the outer surface of a movable airfoil; and the sealing plate flexible part is a curved surface type variable thickness plate with the middle part bulging outwards and the thickness gradually decreasing to zero from the root to the tail end of the sealing plate. The sealing plate provided by the invention is capable of ensuring the sealing effect during the whole movement process of the movable airfoil, and has the characteristics of small size and light weight.

The invention discloses 14.5mm-thickness dedicated automobile spoke steel uniform in property and a manufacturing method and application of the spoke steel, and belongs to the field of micro-alloying steel manufacturing. In the manufacturing method, a rough rolling and precision rolling two-stage rolling mode is adopted to carry out rolling on a slab, the proportion of the transverse rolling pass to the longitudinal rolling pass meets 1:1.5N in the rough rolling stage, N is a positive integer and is larger than or equal to 2, in the cooling process, the rule that the length of a steel plate is matched with the conveying speed of a conveying roller way and the cooling water amount is adopted for carrying out control, the steel plate is cooled and then is subject to further heat treatment in a normalizing manner, and the rotary pressing manner is adopted in spoke manufacturing. The tensile strength of the steel plate manufactured through the method can reach more than 510 MPa, the difference of the longitudinal and transverse mechanical properties can be controlled within 50 MPa, the fatigue life of a spoke manufactured through the steel plate can reach more than 2400000 times, and through inspection of an automobile wheel enterprise, the use requirement can be met.

The invention belongs to the field of automobile parts and particularly relates to an automobile composite board spring. The automobile composite board spring comprises a steel plate sprig piece located on the upper portion and at least one composite material spring piece located on the lower portion. The steel plate sprig piece and the composite material spring pieces are overlaid up and down and are connected into a whole through fasteners. According to the automobile composite board spring, the composite structure of the steel plate sprig piece and the composite material spring pieces is adopted, structure design is reasonable, the effect is significant, when the automobile composite board spring is installed on an automobile chassis and road jolts are transmitted to the spring through an axle, the high-strength composite material spring pieces absorb most vibration through elasticity of the composite material spring pieces, and good vibration reducing performance is achieved. The steel plate sprig piece mainly achieves the effects of connection with an automobile body and bearing of a small quantity of torsion and shear stress caused by steering and braking, and thus overall strength is ensured. Composite materials are light, so that the weight of the whole automobile board spring is reduced, and the effects of weight reducing, emission reducing and load increasing are very significant.

Disclosed is a lubricating oil composition that is characterized by comprising a mixture of (A) in the range of 5 mass% to 70 mass%, based on the total amount of the composition, of a lubricant base oil in which the sulfur content is no more than 0.03 mass%, based on the total amount of the composition, and the kinematic viscosity at 100 DEG C is in the range of 0.5 mm2 / s to 1.5 mm2 / s, and (B) in the range of 15 mass% to 30 mass%, based on the total amount of the composition, of a poly-alpha-olefin in which the kinematic viscosity at 100 DEG C is at least 150 mm2 / s.

The invention provides a train axle combined laser reinforcement method. According to the invention, axle interference fit parts are subjected to laser reinforcement, and axle non-interference fit parts are also subjected to laser reinforcement. With the method provided by the invention, reinforcement lives of axle interference fit parts match those of axle non-interference fit parts, axle service life is long, and axle reliability is high.

The invention relates to a method for equivalently converting a fatigue load of a large welding structural part. Needed equivalent load information is determined according to the operating work condition of the large welding structural part and relevant standards; a stress concentration position and its stress state of the large welding structural part under the effect of a theoretical load are calculated; multiple loads needing to be equivalently converted are combined to form one load, the magnitude and direction of an equivalent load are preliminarily determined; the magnitude of the load needing conversion with respect to a resultant moment of a central point of the structural part is determined, and the acting position of the equivalent load is calculated; the stress state of an original stress concentration position of the structural part is calculated; the fatigue life of the determined same stress concentration positions in an equivalent fatigue life diagram is compared; if fatigue life error results of the stress concentration positions before and after equivalent conversion of the load meet the engineering requirements, the equivalent load of a structural part fatigue test is determined. It is ensured that on the premise that the fatigue life of the structural part is invariable, load number is decreased, a testing scheme is simplified, the testing cost is saved, anda testing period is shortened.

The invention relates to a device of rotor with jaw dry-type vacuum pump. Between the axle hole and ectotheca distributing strengthening rib according to circle. Base on confirming the strength and fatigue life. The weight of rotor wide-range reduced at 1 / 2 to 1 / 3 of the past. The consumption of material reduced effective. Because of light weight, the rotor's operation cost less electric energy. The loading and deforming are lightness, make the operating life longer. Strengthening rib make process time of dynamic balance wide-range shorten, and confirm the balance better. The design make commercial batch process has great value in use and huge potentiality.

The invention provides a rotary speed-limiting floating jet tool. The rotary speed-limiting floating jet tool comprises an outer cylinder and a rotating shaft, wherein the rotating shaft is installed in the outer cylinder in a rotatable and axial reciprocating movement mode, a liquid passing channel is formed in the rotating shaft, the front end of the rotating shaft is provided with a spraying hole used for centrifugal spraying, the rear end of the rotating shaft communicates with the outer cylinder, the spraying hole communicates with the liquid passing channel, and a speed limiting structure is arranged between the outer cylinder and the rotating shaft; the rotating shaft is arranged to be driven by liquid conveyed into the liquid passing channel from the outer cylinder, so that rotation and axial reciprocating movement are achieved; the speed limiting structure is used for limiting the rotating speed of the rotating shaft, and the spraying hole is used for centrifugally spraying the liquid outwards. The rotary speed-limiting floating jet tool is used in cooperation with a coiled pipe, key jet treatment can be carried out on a certain specific area without the need for the coiled pipe to take up and down, and the fatigue life of the coiled pipe is effectively guaranteed.

The invention relates to a high-speed precision laser drilling platform and a control method thereof. The high-speed precision laser drilling platform includes: a macro XY movement platform, a micro XY movement platform, and a working suction cup; the micro XY movement platform is installed on the macro XY movement On the platform; the micro-XY motion platform includes: a support seat, a connecting frame, a micro-bearing platform, an X-axis flexible hinge piece, and a Y-axis flexible hinge piece; the two ends of the X-axis flexible hinge piece are respectively fixed on the connecting frame on the support seat; the two ends of the Y-axis flexible hinge piece are respectively fixed on the connecting frame and the micro-carrying platform; the micro-carrying platform is also provided with a micro-X-axis encoder and a micro-Y-axis The encoders are respectively used to measure the motion information of the X / Y direction of the micro-carrying platform; the working suction cup is installed on the micro-carrying platform of the micro-XY motion platform. The invention utilizes the elastic deformation of the flexible hinge to realize high-speed interpolation and realize high-speed and precise positioning between holes.

The invention discloses a method for manufacturing a wind power forging by using a 20CrMnMo continuous casting blank, which comprises the following steps of: selecting materials, charging in a furnace for first heating, forging, charging the furnace for second heating, forging and forming, and normalizing. In the method for manufacturing the wind power forging by using the 20CrMnMo continuous casting blank, internal defects are welded through high-temperature heating, forging and pressing in earlier stage, and internal textures are finned through low-temperature heating and forming in later stage, thus the requirements for relevant ultrasonic flaw detection and grain size can be achieved and the fatigue life of the wind power forging is ensured.

The invention relates to a high-speed precise laser drilling platform and a control method thereof. The high-speed precise laser drilling platform comprises a macro XY motion platform, a micro XY motion platform and a working sucker, wherein the micro XY motion platform is arranged on the macro XY motion platform, the micro XY motion platform comprises a supporting base, a connecting frame, a micro-bearing platform, an X-axis flexible hinge piece and a Y-axis flexible hinge piece, the two ends of the X-axis flexible hinge piece are correspondingly fixed on the connecting frame and the supporting base, the two ends of the Y-axis flexible hinge piece are correspondingly fixed on the connecting frame and the micro-bearing platform, the micro-bearing platform is further provided with a micro X-axis encoder and a micro Y-axis encoder which are used for measuring the motion information of the micro-bearing platform in the X / Y direction respectively, and the working sucker is installed on the micro-bearing platform of the micro XY motion platform. According to the high-speed precise laser drilling platform and the control method thereof, high-speed interpolation is realized by means of elastic deformation of flexible hinges, and high-speed precise positioning among holes is realized.