390results about How to "Well formed" patented technology

The invention discloses a complex terrain wind resource assessment method based on measured data correction of an anemometer tower, and the method comprises the steps: simulating a complex terrain wind field based on a mesoscale WRF mode, and obtaining the mesoscale data of an innermost layer nested domain containing a wind power plant; according to the mesoscale data obtained in the step S1, microscale computational domain boundary inflow information is extracted, and initial prediction field information of the complex terrain wind field is obtained based on a mesoscale-microscale coupling mode; according to the anemometer tower position and the flow field characteristics, determining an anemometer tower reference height used for data correction and a corresponding observation wind speed and turbulence intensity; and S3, correcting the WRF-CFD numerical simulation result obtained in the step S2 by adopting the related data of the anemometer tower determined in the step S3 to obtain corrected wind speed and turbulence information of the wind field of the complex terrain. According to the method, the medium-micro scale coupling numerical simulation result can be improved, and the accuracy of wind resource evaluation is greatly improved.

The invention relates to the technical field of ultrasonic detection, and particularly discloses a pipeline internal corrosion detection device for a pressure pipeline, which comprises a flaw detector, the outer surface of the lower end of the flaw detector is fixedly connected with an ultrasonic probe for scanning the pipeline, and the outer surface of one side of the flaw detector is provided with a connecting kit for binding the flaw detector on a to-be-detected pipeline. The connecting suite consists of two groups of chains, a cross rod is fixedly connected between the two groups of chains, and the outer surface of the other side of the flaw detector is connected with a hook butted with the cross rod; a moving assembly for driving the flaw detector to move on the pipeline is arranged on the outer surface of the lower end of the flaw detector, a connecting sleeve is arranged on one side of the flaw detector, the flaw detector can be bound to the outer surfaces of pipelines of different sizes through a plurality of chains, the two chains and the transverse rod are bound to the surfaces of the pipelines, and meanwhile the moving direction of the flaw detector can be limited; the stability of the flaw detector is improved, and meanwhile, the height of a hook is changed by rotating an adjusting rod, so that the binding degree of the chain can be adjusted.

The invention provides a control parameter adjustment method based on a stability domain of a multi-grid-connected inverter system. The method comprises the following steps: acquiring a first proportionality coefficient and a first current reference value of a single-grid-connected inverter current controller; obtaining an effective power grid impedance matrix of the multi-grid-connected inverter system; based on the first proportionality coefficient, the first current reference value and the effective power grid impedance matrix of the multi-grid-connected inverter system, determining a loop gain matrix eigenvalue node diagram of the single-working-condition multi-grid-connected inverter system corresponding to the single-grid-connected inverter; determining a stability domain three-dimensional point of the single-working-condition multi-grid-connected inverter system based on a loop gain matrix eigenvalue node diagram of the single-working-condition multi-grid-connected inverter system; determining a multi-working-condition multi-grid-connected inverter system stability domain three-dimensional diagram corresponding to the single grid-connected inverter based on the single-working-condition multi-grid-connected inverter system stability domain three-dimensional point; and adjusting the first proportionality coefficient and the first current reference value based on the stability domain three-dimensional diagram of the multi-working-condition multi-grid-connected inverter system. The adjusting process is simple to operate and easy to implement.

The invention relates to the technical field of information, in particular to an artificial intelligence advertisement publishing method, which comprises the following steps: collecting and preprocessing advertisement data, so that the data is more standardized and consistent, and the quality of the data is effectively improved; by establishing the sentiment analysis model, the sentiment polarity of the input vector can be accurately estimated, the individuation degree of the advertisement is improved, and meanwhile, a sentiment basis is provided for individualized advertisement creativity; by training the sentiment analysis model and updating model parameters by using a gradient descent method, the performance of the model can be continuously optimized, and the accuracy of sentiment classification is improved; by obtaining the user feedback data and calculating the comprehensive user feedback index, the effect of the personalized advertisement creativity is evaluated, targeted adjustment and optimization are facilitated, and the overall effect of the advertisement and the user experience are improved. The invention is used for solving the technical problem of poor advertisement release effect in the existing scheme.

The invention discloses a multi-cell energy-absorbing thin-walled tube based on a paper folding structure, which belongs to the technical field of structural mechanics and comprises a thin-walled inner tube, a thin-walled outer tube and a plurality of rib plates. Each layer of unit cell structure is defined by n unit wall plates in an end-to-end connection mode, each unit wall plate comprises an upper trapezoidal unit plate and a lower trapezoidal unit plate which are connected along a first crease, and the left side and the right side of each upper trapezoidal unit plate are connected with upper triangular unit plates along second creases correspondingly. The left side and the right side of the lower trapezoidal unit plate are respectively connected with the lower triangular unit plate along a third crease, and the upper triangular unit plate and the lower triangular unit plate are connected through a fourth crease. According to the multi-cell energy absorption thin-walled tube based on the paper folding structure, the thin-walled inner tube and the thin-walled outer tube which are of the paper folding structure are compounded through the rib plates, higher average crushing force is obtained through the compound design, and therefore the load stability of the structure is improved; the deformation process of the multi-cell energy-absorbing thin-walled tube is stable and controllable through specific crease lines and geometric shape design.

The invention belongs to the technical field of intelligent controlled-release antibacterial packaging, and particularly relates to a preparation method and application of a multi-response polymer fresh water absorption pad of a sandwich-like structure. The preparation method comprises the following steps: firstly, preparing a hydrophilic inner-layer spinning solution, a humidity response middle-layer spinning solution and a pH response outer-layer spinning solution; the hydrophilic inner layer spinning solution, the humidity response middle layer spinning solution and the pH response outer layer spinning solution are subjected to continuous electrostatic spinning to prepare a composite membrane of a three-layer nanofiber structure, namely the multi-response polymer fresh water absorption pad of a sandwich-like structure. Through the layered design, the water absorption pad integrates the functions of one-way moisture transmission, antibiosis and corrosion prevention, the preservation period of food is prolonged, self-adaptive adjustment can be achieved according to the humidity and pH change in the storage environment, the dynamic requirements of different food storage conditions are met, and the more accurate preservation effect is provided. And meanwhile, various food packaging requirements can be met, food loss is effectively reduced, economic benefits are improved, and the application prospect is wide.

The invention discloses a polyether-ether-ketone polishing brush wire material and a preparation method thereof, and belongs to the technical field of brush wire material preparation. The polyether-ether-ketone polishing brush wire material is prepared from, by weight, 50-70 parts of polyether-ether-ketone, 8-13 parts of a modified flexibilizer, 5-10 parts of a modified stabilizer, 3-6 parts of a light stabilizer, 6-12 parts of a lubricant and 2-5 parts of graphite, the modified flexibilizer is prepared from allyl glycidyl ether, benzyl dimethyl silane, vinyl acetic acid and 4-methoxyphenol, and the modified flexibilizer is prepared from vinyl acetate and 4-methoxyphenol. The modified stabilizer is prepared from pentafluorobenzoic acid, potassium tert-butoxide, 1, 10-phenanthroline, pentafluorobromobenzene, 4-aminophenol and pyromellitic dianhydride. The polyether-ether-ketone polishing brush wire material prepared by the method has excellent toughness, organic solvent resistance and wear resistance.

The utility model discloses a mounting structure for a metal roof and a photovoltaic module. The mounting structure comprises the photovoltaic module, the metal roof and a bracket, the metal roof is obliquely arranged, and the photovoltaic module is horizontally arranged above the metal roof; the photovoltaic module is fixed on the metal roof through a bracket; the support type is simplified, batch machining can be achieved, the finished product form is high, universality is high, and the support is simple, practical and easy to use to form assembly type installation.

The invention discloses a preparation method of a metal oxide coated high-nickel ternary positive electrode material, which comprises the following steps of: dissolving a solution containing coated metal in an organic solvent under a stirring condition to obtain a solution containing metal oxide; adding the high-nickel ternary material powder into an organic solvent under ultrasonic operation to obtain a solution of the high-nickel ternary positive electrode material powder; dropwise adding the solution containing the metal oxide into the solution of the high-nickel ternary positive electrode material powder under ultrasonic operation to obtain a mixed solution; heating the mixed solution under a magnetic stirring condition to volatilize the solvent, collecting the material, and drying in a vacuum drying oven; and calcining the dried material in pure oxygen to obtain the metal oxide coated high-nickel ternary positive electrode material. The electrochemical performance of the high-nickel ternary positive electrode material at low temperature can be effectively improved, specifically, the surface of the positive electrode is regulated and controlled, the contact area of the surface of the ternary positive electrode material and electrolyte at low temperature is reduced, so that side reaction is reduced, and meanwhile, the coating layer with certain mechanical strength can be formed in the long-term cycle process at low temperature, so that the electrochemical performance of the high-nickel ternary positive electrode material is improved. Positive electrode breakage is effectively reduced, and the cycling stability of the high-nickel ternary positive electrode at low temperature is effectively improved.

The invention discloses a preparation method of a high-temperature wear-resistant multilayer material on the surface of a precision part, and relates to a preparation method of a high-temperature wear-resistant coating on the surface of the precision part. The invention aims to solve the technical problem of poor wear resistance of the surface coating of the precision part at high temperature at present. According to the invention, a magnetron sputtering multi-target co-sputtering mode is adopted, a laminated composite film is formed on the surface of a precision part such as a shaft, and selected target materials are a CoCrFeNi target, a Ti target and a CuNb target. In the preparation process of the multi-layer film, due to the fact that a large number of interfaces exist and can effectively hinder dislocation movement, and a large number of self-lubricating matter phases are matched together, the hardness and abrasion resistance of the material are improved, and the service life of the multi-layer film is prolonged. And the multilayer film structure can optimize the high-temperature phase transformation resistance of the whole coating by adjusting the thickness ratio and high-temperature elements between the layers, so that the high-temperature performance of the coating is remarkably improved, and the high-temperature wear resistance of the CoCrFeNi / Ti / CuNb multilayer material is more excellent.

The invention relates to the technical field of metal processing, and discloses a folding machine rotating shaft manufacturing method which comprises the following steps: S1, providing a blank which is provided with a forming blank for forming a rotating shaft and auxiliary blanks connected to two sides of the forming blank, and processing an outer side surface consistent with the appearance of a product on the forming blank; s2, an auxiliary blank is used for auxiliary positioning, a groove is machined in the forming blank, and a rotating shaft rough blank is formed; s3, the inner wall of the groove is machined, and a rotating shaft connected to the auxiliary blank is formed; and S4, the joint of the rotating shaft and the auxiliary blank is separated, and a rotating shaft finished product is formed. Firstly, a blank is formed through an aluminum extrusion material, a formed blank and an auxiliary blank are formed respectively, the formed blank is used for forming a product, the auxiliary blank is used for assisting in forming of the product, and the product is more easily generated on the formed blank through fixing and positioning of the auxiliary blank; and the grooves are firstly machined, so that subsequent blanking is easier, and the machining difficulty is reduced.

The invention relates to a tuyere small sleeve and a blast furnace. The tuyere small sleeve comprises an inner sleeve and an outer sleeve, wherein the inner sleeve is provided with an air supply hole penetrating in the axial direction; the outer sleeve is arranged on the inner sleeve in a sleeving mode, the two axial ends of the outer sleeve and the inner sleeve are connected in a sealed mode, an annular installation cavity is defined by the inner sleeve and the outer sleeve, and the installation cavity is arranged on the outer side of the air supply hole in a sleeving mode; the reinforcing columns are arranged in the mounting cavity in the radial direction, a gap exists between every two adjacent reinforcing columns, and the two ends of each reinforcing column are connected with the outer wall of the inner sleeve and the inner wall of the outer sleeve respectively. Thus, the reinforcing columns can support the inner sleeve and the outer sleeve, the structural strength of the tuyere small sleeve is improved, the reinforcing columns can make contact with cooling liquid, the contact area of the tuyere small sleeve and the cooling liquid is increased, and therefore the heat exchange area is increased, abrasion and melting loss of the tuyere small sleeve caused by high temperature are reduced as much as possible, and the service life of the tuyere small sleeve is prolonged. Moreover, the tuyere small sleeve is simple in structure, convenient to form, low in cost and convenient for low-cost batch production.

The invention provides a bifunctional oxygen electrocatalyst with an asymmetric coordination structure and a preparation method and application thereof, a porous layered precursor is formed through an amide reaction between melamine and citric acid, and the special structure and different functional groups of the porous layered precursor provide many sites for insertion and adsorption of transition metal ions; and an asymmetric coordination structure with high active sites can be formed, the electronic structure of transition metal ions is effectively optimized, and the electro-catalytic performance is improved. The bifunctional oxygen electrocatalyst prepared by the invention shows excellent ORR / OER activity under alkaline conditions, and the power density of a zinc-air battery driven by the bifunctional oxygen electrocatalyst as a cathode catalyst reaches up to 226.7 mW cm <-2 >.

The present invention provides a test device for shield cutterhead mud cakes taking into account high temperature and high pressure. A double-layer cylindrical test cylinder is sealed at the bottom by a cylindrical cylinder bottom cover (4). The top of the double-layer cylindrical test cylinder is open. A cylindrical inner cylinder top cover (3) is movably arranged at the top opening. An electric-controlled jack (5) for applying vertical pressure is connected to the upper surface of the cylindrical inner cylinder top cover (3). A plurality of electrically controllable heating rods (13), a plurality of unconfined compressive strength sample molds (11) and a plurality of direct shear sample molds (12) are arranged inside the double-layer cylindrical test cylinder. The present invention also discloses a test method for shield cutterhead mud cakes taking into account high temperature and high pressure. The present invention can study the mechanism or conditions of cutterhead mud cakes under the action of high temperature and high pressure, which is more consistent with the actual situation and avoids the operation of injecting a dispersant to decompose the mud cakes after the mud cakes are formed in shield practice.

The invention relates to the technical field of alloy surface nitriding treatment, in particular to a surface nitriding strengthening method for a strong nitride forming element high-entropy alloy, Fe, Co, Cr, Ni and Al are mixed, the strong nitride forming element high-entropy alloy is prepared through a vacuum hot pressing sintering method or a 3D printing method, and then ion nitriding is conducted; during vacuum hot pressing sintering, G * R ranges from 4000 K / s to 5500 K / s, and G / R ranges from 800 Ks / mm < 2 > to 1500 Ks / mm < 2 >; during 3D printing, G * R at the top of a single-pass molten pool is 7000-8000 K / s, G / R at the top of the single-pass molten pool is 200-300 Ks / mm < 2 >, G * R in the middle of the molten pool is 2000-3000 K / s, G / R at the middle of the molten pool is 500-1200 Ks / mm < 2 >, and G * R at the bottom of the molten pool is 300-1000 K / s, and G / R at the bottom of the molten pool is 2000-3000 Ks / mm < 2 >. And the mechanical property is enhanced by regulating G and R.

The embodiment of the invention discloses a traveling wave tube high-frequency assembly and an assembling method thereof, the traveling wave tube high-frequency assembly comprises a traveling wave tube high-frequency assembly, the high-frequency assembly comprises a composite tube shell and an all-metal slow wave structure arranged in the composite tube shell, the composite tube shell comprises an electron gun welding disc, a pole shoe, a spacer ring and a collector welding disc, and the electron gun welding disc, the pole shoe and the spacer ring are brazed together. The all-metal slow-wave structure is composed of a plurality of radial sub-cavities, and the radial sub-cavities are fixed in the composite tube shell through high-temperature diffusion welding. The high-frequency assembly does not need to use a thin-wall tube shell, is simple to assemble, can reduce the inner diameter of a magnetic system, increases bunching current, and further increases the output power under the condition that the voltage is not changed. The composite tube shell and the all-metal slow wave structure are matched through a circle, and the machining precision error can be 0.08 mm. The multiple radial sub-cavities can be fixed in the composite tube shell only through high-temperature diffusion welding, the technological process is simple, the assembly efficiency and precision are high, and the problem that the matching degree becomes poor due to the fact that welding flux flows into the slow-wave structure is solved.

The invention relates to a winding type charger and a rotary electrical connection structure and a forming method thereof, and the method comprises the following steps: carrying out the punch forming of an original sheet of a conductive sheet group and an original sheet of a conductive elastic sheet group to form a conductive sheet group precursor and a conductive elastic sheet group precursor, and enabling the conductive sheet group precursor and the conductive elastic sheet group precursor to comprise a plurality of annular conductors with a predetermined thickness, a pre-pressing part is connected among the multiple paths of annular conductors; forming a hollow part on the circuit board corresponding to the position of the pre-pressing part; mounting the conductive sheet group precursor and the conductive elastic sheet group precursor on the circuit board, and enabling the pre-pressing parts to correspond to the corresponding hollow parts during mounting; after surface mounting, the conductive sheet group precursor and the conductive elastic sheet group precursor are punched for the second time, the second punching comprises the step of cutting off or cutting off the pre-pressing part along the indentation, so that adjacent rings are isolated from each other to avoid short circuit, and the pre-pressing part correspondingly forms a first indentation part and a second indentation part after being punched, so that the first indentation part and the second indentation part are separated from each other; the rotary electrical connection structure is long in service life, reliable, high in alignment precision and convenient to form.

The invention discloses a motor shell structure convenient for heat dissipation, and relates to the technical field of motors, the motor shell structure comprises a shell, the outer surface of the shell wall of the shell is uniformly provided with an even number of axial straight flutes, the shell wall of the shell is respectively provided with a first straight flow channel and a second straight flow channel which are axially penetrated, the first straight flow channel is correspondingly arranged at the inner side of the bottom of the straight flutes, and the second straight flow channel is correspondingly arranged at the inner side of the bottom of the straight flutes. The two ends of the machine shell are provided with circulating drainage end covers, each cooling fin comprises a concave shell installed on the corresponding straight groove, a shell cover is installed on a concave opening of the concave shell, a cooling cavity is formed between the shell cover and the concave shell, and a second partition strip extending into the cooling cavity and facing the bottom of the concave shell is arranged on the shell cover. A column cavity is formed in the second partition strip, and branch flow holes corresponding to the column cavity are formed in the bottom of the concave shell. Through the structural arrangement of the heat dissipation fins, the circulating flow stroke of the cooling liquid can be shortened, the flow stroke efficiency of the cooling liquid is maximized, and then the cooling efficiency of the machine shell is improved.

A method for preparing a silicon carbide film with assistance of laser comprises the steps that S1, a base material is provided, raw material gas is introduced, the surface of the base material is scanned through an ultraviolet laser beam, and the raw material gas is deposited on a scanning path to form silicon carbide crystal grains of a specific crystal form; and S2, carrying out secondary deposition on the surface of the base material on which the silicon carbide crystal grains with the specific crystal form are deposited by adopting a chemical vapor deposition process to form the silicon carbide film with the same crystal form. The method comprises the following steps: depositing silicon carbide crystal grains in a specific crystal form on a scanning path by using ultraviolet laser, and depositing a silicon carbide film on the surface of a base material on which the silicon carbide crystal grains in the specific crystal form are formed by using a chemical vapor deposition process; the silicon carbide crystal grains can effectively improve the utilization rate of raw materials of the chemical vapor deposition process and reduce the reaction time, and help a silicon carbide film to be formed more easily and be combined with a base material more firmly.

The invention discloses a low-damage self-resetting concrete column foot connecting joint structure and a construction method, the low-damage self-resetting concrete column foot connecting joint structure comprises a concrete foundation, a low-damage prefabricated concrete frame column, a prestressed steel strand and a low-yield-point energy-consuming reinforcing steel bar, the prestressed steel strand penetrates through the concrete foundation and the low-damage prefabricated concrete frame column and is tensioned and anchored; the concrete foundation and the low-damage prefabricated concrete frame columns are connected; the low-yield-point energy-consuming steel bars are pre-buried at the bottoms of the low-damage prefabricated concrete frame columns; the problems that in an existing multi-layer self-resetting concrete bottom layer column foot connecting joint, column bottom concrete is seriously damaged by pressure under the action of a high axial compression ratio and in a large deformation state, and resetting after an earthquake is affected are solved, meanwhile, the energy dissipation capacity of a component is improved by combining the energy dissipation steel bars, damage and residual deformation of the concrete at the end of the component under the action of the earthquake are reduced, and the energy dissipation performance is improved. And the repairable performance of the structure is improved.

The invention relates to the technical field of terahertz metamaterial biosensors, in particular to a light and dark mode coupled terahertz all-dielectric biosensor and a preparation method thereof. The all-dielectric metamaterial biosensor is obtained through anodic bonding, photoetching patterning, etching and specific antibody modification, the sensor comprises a dielectric layer and a substrate layer, the dielectric layer is an array formed by alternating split ring structures and rod-shaped structures of all-dielectric metamaterials, openings are symmetrically formed in the two ends of each split ring structure, and the rod-shaped structures of all-dielectric metamaterials are arranged on the substrate layer. The distances between the rod-shaped structure and the split ring structures on the left side and the right side are u and v respectively, and v-u is larger than or equal to 1 micrometer and smaller than or equal to 5 micrometers. In the dielectric layer of the sensor, the rod-shaped structure is used as a bright mode, the split ring structure is used as a dark mode, and the two arrays interact with each other, so that light and dark mode coupling is realized, a harmonic peak is split, a Q factor and sensitivity are increased, and the sensor has the effects of high sensitivity and low detection limit on low-concentration biological sample detection in a terahertz wave band; and the method is stable and reliable.

The utility model relates to the technical field of underground protectors, in particular to an anti-abrasion sleeve for a sucker rod, which is provided with a central hole for the sucker rod to penetrate through, an oil guide hole is arranged in the anti-abrasion sleeve, and the oil guide hole obliquely extends relative to the axis of the central hole or spirally extends around the axis of the central hole. The oil guide holes can drive the anti-abrasion sleeve to rotate to achieve even abrasion when oil flows through the oil guide holes, meanwhile, the oil guide channels are formed by the oil guide holes in the anti-abrasion sleeve, the oil guide channels can be prevented from occupying the outer surface of the anti-abrasion sleeve, the anti-abrasion area of the anti-abrasion sleeve is prevented from being affected, and the service life can be prolonged.

The invention discloses a 3D printing method with a coating supporting structure and a supporting assembly, and belongs to the technical field of additive manufacturing. According to the method, a traditional thought of printing a second structural material is abandoned, a functional coating used for reducing the binding force is innovatively arranged on the upper surface of a formed supporting structure, and then a workpiece is printed on the coating. The coating provides temporary bonding force in the printing process so as to stabilize a workpiece, and after printing, the bonding force is greatly weakened so that the support can be easily peeled off. The invention further provides a post-processing G code program for realizing the method and an integrated gluing device, and the post-processing G code program and the integrated gluing device can realize the expansion and contraction of the refill through mechanical triggering by utilizing the movement of the printer without additional driving. The support assembly is a ready-to-use component which is pre-coated with the coating. According to the method, the contradictions of poor supporting quality of a single material and high supporting cost of multiple materials are fundamentally solved, stable printing, easy removal and high interface quality are realized on the premise of not increasing the types of printing materials and not depending on multi-nozzle equipment, the cost is remarkably reduced, and the efficiency is improved.

The invention provides an online optimal guidance method and device based on secondary rectification and electronic equipment, and the method comprises the steps: converting a first optimal control problem containing a process constraint into a second optimal control problem not containing the process constraint, solving the second optimal control problem through a model prediction static planning method, and solving the second optimal control problem through a model prediction static planning method. According to the method, a control quantity updating equation of an analysis iteration form is obtained, iteration correction is performed on a control quantity guess value based on the control quantity updating equation, an optimal guidance instruction is obtained, namely, a general solving algorithm with the analysis iteration form is realized, the form is simple, the time consumption of single iteration is extremely low, the total time consumption is relatively low, and the solving efficiency is greatly improved; and the first optimal control problem containing the process constraint is converted into the second optimal control problem without the process constraint, so that the solving accuracy is improved in a mode of solving the second optimal control problem through the model prediction static planning method, and the universality is good.

The utility model relates to the technical field of laser cutting, and provides a laser cutting machine working table and a laser cutting machine, the working table comprises a mounting frame, a main connecting piece and a plurality of cutting supporting pieces, the mounting frame comprises a main transverse frame piece and a main longitudinal frame piece, the main longitudinal frame piece is arranged at the end of the main transverse frame piece, and the cutting supporting pieces are arranged on the main transverse frame piece. The main transverse frame pieces and the main longitudinal frame pieces jointly define a rectangular installation frame, the ends, close to the main longitudinal frame pieces, of the main connecting pieces are connected with the main longitudinal frame pieces in a matched mode, the ends of every two adjacent main connecting pieces are connected, and therefore the main connecting pieces are installed on the installation frame. The installation parts are arranged on the main transverse frame pieces and the main connecting pieces, the cutting supporting pieces arranged in a sawtooth strip shape are installed in the installation parts, therefore, the cutting supporting pieces are detachably installed on the installation frame, after the ends of the cutting supporting pieces are damaged, the damaged cutting supporting pieces are directly detached from the installation frame, and therefore the cutting supporting pieces can be installed on the installation frame. And then the complete cutting supporting piece is replaced, and the adaptability is wide.

A wing-plate-free steel box girder bridge temperature fatigue load model is composed of a vertical temperature gradient fatigue load model and a transverse temperature gradient fatigue load model which are both in a bifold line type. According to the temperature field and temperature stress distribution characteristics of the wing-plate-free steel box girder, a Latin hypercube sampling method and a damage equivalence principle are adopted, and a temperature gradient fatigue load model of the wing-plate-free steel box girder bridge with the designed service life reaching 100 years is constructed. According to the temperature fatigue load model, rapid calculation of the temperature fatigue stress process of the wing-plate-free steel box girder bridge is achieved, and the temperature fatigue load model can be used for anti-fatigue design and fatigue life evaluation of the wing-plate-free steel box girder bridge.

The embodiment of the application discloses a non-circular helical gear tooth surface design method, and relates to the field of gear design. The method comprises the following steps: establishing a three-dimensional motion relationship of a non-circular helical gear and a circular helical gear generating wheel; obtaining a tooth surface envelope equation of the non-circular helical gear according to the three-dimensional motion relationship; establishing a tooth surface equation of the circular helical gear generating wheel and obtaining a tooth surface meshing equation of the non-circular helical gear and the circular helical gear generating wheel; and obtaining a tooth surface equation of the non-circular helical gear according to the tooth surface envelope equation, the tooth surface equation of the circular helical gear generating wheel and the tooth surface meshing equation. Through the above method, the precision of the tooth surface of the non-circular helical gear can be improved, and the obtaining process is simpler.

The utility model relates to the technical field of PVC (polyvinyl chloride) section bars, in particular to a side-hung mullion structure, which comprises a lining piece and a PVC section bar, the PVC section bar is in a T shape with a wide upper part and a narrow lower part, a front-back through steel lining cavity is arranged on the inner side of the lower part of the PVC section bar, and the lining piece is mounted in the steel lining cavity. And a first separation cavity, a second separation cavity, a third separation cavity and a fourth separation cavity are formed in the inner side of the upper part of the PVC profile corresponding to the position above the steel lining cavity from left to right at intervals. The flat-opening mullion structure is reasonable and compact in structure, when the flat-opening mullion structure is used, at least one flat-opening mullion structure is fixedly installed in a window frame according to needs, then glass is installed in the left installation groove and the right installation groove, by arranging the steel lining cavities and the lining pieces, the strength of the PVC sectional material can be improved, by arranging the separation cavities, the strength and the heat preservation effect of the PVC sectional material can be improved, and the service life of the PVC sectional material is prolonged. And due to the arrangement of the decorative layer, the anti-ultraviolet performance of the PVC sectional material can be improved, the requirement for different colors inside and outside a window body of a customer can be met, and product diversification is increased.

The present invention relates to an enhanced operation method of a full-process autotrophic denitrification process, and belongs to the technical field of biological treatment of nitrogen-containing wastewater. The present invention starts the full-process autotrophic denitrification process by setting a sludge internal reflow system on a membrane bioreactor, applying an electromagnetic field generating system on the internal reflow pipeline, and gradually increasing the ammonia nitrogen concentration of the influent. By regulating the magnetic field intensity and application cycle, the reflux ratio in the mixed liquid, and the dissolved oxygen concentration, the growth rate and activity of aerobic ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria are promoted, so that the two can coexist harmoniously and efficiently, and the rapid start-up of the full-process autotrophic denitrification process is achieved, and the process operation stability is enhanced. The method to which the present invention belongs has a simple process and mild reaction conditions, and can improve the denitrification effect of the process under medium and low temperature conditions; the internal reflow of muddy water and the higher reflux ratio are conducive to the full mixing of activated sludge and sewage in the reactor, reducing the stirring power demand, reducing the reactor operation cost, and more easily forming granular sludge; the reactor is not limited by the size of the permanent magnet, has no magnetic field attenuation problem, can adjust the magnetic field intensity at any time, has a wider range of application, can be modified on the basis of the existing reactor, and is convenient for engineering application.

The invention belongs to the technical field of plastic granulation, and in particular to an environmentally friendly flame-retardant nylon engineering plastic granulation device, comprising a plastic heating extruder, wherein a cutting and molding component is arranged at the discharge end of the plastic heating extruder, and the cutting and molding component comprises a shell cover arranged at the discharge end of the plastic heating extruder; the extruded plastic can be conveniently cut, and the cut plastic particles can be cooled and dissipated at the same time, so as to facilitate the rapid molding of the plastic particles, and the molded plastic particles can be quickly discharged in coordination with an inclined guide plate in an inclined and shaking state, so as to facilitate the rapid replacement of an extrusion mold of a required size according to actual use needs, adjust the size of the produced plastic particles, improve the use range of the equipment, facilitate the scraping of plastic residues attached to the surface of the cutter, and avoid the high-temperature extruded plastic from adhering to the surface of the cutter to affect the cutting quality of the cutter, thereby improving the quality of the product.