23results about How to "Ensure mechanical stability" patented technology

The invention belongs to the technical field of material preparation, and aims to solve the problems of interface separation and weak oxidation resistance under complex working conditions caused by insufficient interface bonding force of the existing carbon / carbon composite material. In order to achieve the purpose, the invention provides a carbon / carbon composite material and a preparation method thereof. The carbon / carbon composite material comprises the following components in percentage by mass: 40%-55% of polyacrylonitrile-based carbon fibers, 10%-25% of pitch-based carbon fibers, 8%-20% of nano silicon dioxide grafted carbon fibers, 8%-20% of biological pitch, 8%-15% of nano graphene modified phenolic resin, 3%-6% of silicon carbide whiskers, 2%-4% of zirconium boride nanoparticles, 2%-4% of graphitized carbon fibers and 1%-3% of a natural plant extract antioxidant. The carbon / carbon composite material provided by the invention can provide stable interface bonding force and remarkable oxidation resistance, so that the structural integrity and mechanical property stability of the material when bearing various complex stresses such as stretching, compression, bending, shearing and the like are guaranteed, and the application range of the material in the field of high-temperature oxidation resistance is widened.

The invention provides a magnesium alloy electric arc additive component and a manufacturing method and application thereof, and belongs to the technical field of electric arc additive manufacturing. The manufacturing method of the magnesium alloy electric arc additive component comprises the following steps that a magnesium alloy base plate is fixed to a printing table, a magnesium alloy wire is conveyed to the position below a welding gun, single-channel layer-by-layer reciprocating welding is carried out, after welding of each layer is completed, an oxidation film on the surface of a printed piece is cleaned, and after the interlayer temperature reaches 80-100 DEG C, welding of the next layer is carried out; and the steps are repeated to the target height, and the magnesium alloy electric arc additive component is obtained. According to the manufacturing method of the magnesium alloy electric arc additive component, control over internal defects of the magnesium alloy and good interlayer combination can be achieved, the obtained magnesium alloy electric arc additive component is small in mechanical property anisotropy, and the strength and plasticity are remarkably improved.

The invention belongs to the technical field of silicone rubber, and particularly relates to a preparation method of low-density addition type flame-retardant liquid silicone rubber, which comprises the following steps: putting vinyl silicone oil and fumed silica into a vacuum kneading machine, mixing at constant temperature for 1-3 hours, and then heating and mixing for 2-3 hours to obtain a component A; adding a low-density flame retardant into the component A, and mixing at constant temperature for 2-4 hours to obtain a component B; and uniformly stirring the component B, hydrogen-containing silicone oil, a platinum catalyst and 1-ethynyl-1-cyclohexanol, and carrying out vulcanization molding to obtain the low-density addition type flame-retardant liquid silicone rubber. The problem that the mechanical property of an existing flame retardant becomes poor is solved, by means of the porous silica structure contained in the flame retardant, the physical clamping and fixing effect is achieved, and physical and chemical connection of the flame retardant in the whole system is achieved by means of the silicon hydroxyl activity of the silica structure.

The invention relates to a perfluorohexanone nano microcapsule multi-time fire extinguishing tablet and a preparation method thereof, and belongs to the technical field of fire extinguishing material processing. The invention discloses a preparation method of a perfluorohexanone nano microcapsule multi-time fire extinguishing tablet. The preparation method comprises the following steps: (1) preparing an oil phase for later use; (2) preparing a water phase for later use; (3) stirring the oil phase and the water phase at a high speed to obtain an emulsion; and (4) adding an initiating monomer into the emulsion, heating, preserving heat, filtering, washing and drying to obtain the perfluorohexanone nano microcapsule. And (5) mixing with a base material, introducing into a mold, curing, drying, and spraying a high-molecular polymer on the surface to obtain the perfluorohexanone nano microcapsule multi-time fire extinguishing tablet. According to the perfluorohexanone nano microcapsule, lignin-based polyurethane is used as an outer shell, a polyurea / polyurethane composite structure is used as an inner shell to form a double-shell structure, and therefore the perfluorohexanone nano microcapsule prepared through the method has a compact and stable capsule wall structure, the embedding rate is high, and the fire extinguishing property is excellent.

A kind of vocal cord repair device based on advanced biological printing technology assisted, comprising: imaging positioning component, including endoscope imaging module and three-dimensional reconstruction processor;Surgical operating component, including glottis exposure mechanism and elephant trunk type flexible mechanical arm, glottis exposure mechanism exposes glottis to provide field of view, and mechanical arm high-precision operation;Biological repair component, including micro printing head, compatible hydrogel, injection tube and motion control mechanism, realize vocal cord reconstruction and function recovery.Integrate biological printing component and imaging positioning component, system can accurately obtain the three-dimensional structure data of vocal cord damage area, and realize the millimeter level accurate deposition of biological material, so that the millimeter level precision of imaging positioning, micron level operation of mechanical arm and controllable printing of biological material form closed loop feedback system, improve the overall success rate of vocal cord repair, realize the leap of vocal cord repair from "empirical operation" to "precision engineering", provide safer and more effective treatment options for patients with vocal cord dysfunction.

The invention discloses a single-sintering porous metal mold with different pore diameters for boiling heat exchange, and relates to the field of preparation equipment of porous metal for boiling heat exchange. The die comprises an outer die sleeve, a lower die base and three functional pressure heads, specifically, basic metal powder is compacted through a basic pressure head with a flat end face, then pore channels are pressed out through a pore-forming pressure head with thin cylindrical protrusions, finally, the pore channels are filled with powder with different particle sizes through a filling pressure head with matched through holes, and finally porous metal structures with different pore diameters are obtained through single-time sintering. The preparation process of porous metal with different pore diameters is simplified, the cost is reduced, pore collapse caused by secondary hole machining is avoided, and meanwhile the nucleation efficiency and the heat exchange performance of boiling heat exchange can be remarkably improved through the porous structures with different pore diameters.

The invention discloses an anti-aging and anti-electromagnetic shielding cable and a preparation method thereof, and belongs to the field of high voltage and the technical field of materials, the anti-aging and anti-electromagnetic shielding cable structurally contains a polyurethane-polyethylene copolymer and a flame-retardant and anti-electromagnetic sheet composite carrier, contains a polyurethane chain segment which is connected with a polyethylene main chain through a covalent bond, has no interface separation risk, and has good anti-aging and anti-electromagnetic shielding effects. Polyethylene is resistant to acid, alkali and salt mist, a carbamate group in a polyurethane chain segment can capture free radicals generated by photooxidation and thermal oxidation of polyethylene, aging is delayed from the molecular level, and the flame-retardant anti-electromagnetic sheet composite carrier endows the cable with good aging resistance and anti-electromagnetic shielding characteristics; the lamellar structure of the sheet-shaped carrier can block heat transfer and combustible volatilization, and the lamellar structure and the sheet-shaped carrier synergistically improve the flame-retardant efficiency; the introduction of the flaky composite carrier not only endows functional characteristics, but also can be used as a rigid reinforcement phase, so that the wear resistance and the extrusion resistance of the cable are improved, and the loss of the cable in the dragging and construction processes is reduced.

The application relates to the technical field of robot control, and discloses a bionic multi-arm robot and a cooperative control method thereof, which comprises the following steps: constructing a dynamics model comprising a main body, a motion mechanism and a working mechanism; extracting motion mechanism data to construct a dynamic support polygon; combining a working instruction to deduce an expected disturbance torque generated by the main body; dividing the working mechanism into a working arm and a compensation arm; when it is determined that the compensation ability for the expected disturbance torque is insufficient, the compensation arm is controlled to be converted into an extended configuration; defining a time window according to the dynamic support polygon; and when the working arm generates disturbance within the time window, the compensation arm is controlled to output a reverse joint acceleration to generate a reaction torque to offset the dynamics deviation of the main body. The application uses a non-working arm to reshape a global inertia tensor and generate a feedforward compensation torque, thereby inhibiting dynamic load disturbance at a physical topology level and improving the anti-overturning capability of the robot in a moving and supporting state.

This invention relates to a multifunctional bioactive dental bulk filling composite resin and its preparation method. The composite resin comprises an organic resin matrix and an inorganic filler; the organic resin matrix comprises polymerizable resin monomers and a photoinitiator system, the polymerizable resin monomers comprising dimethacrylate monomers and E-POSS; the inorganic filler comprises nMgO and sSiO2 with a silanized surface. The preparation method includes the following steps: preparing nMgO powder using a sol-gel method combined with a gradient calcination process; preparing submicron-sized sSiO2 using the Stöber method and subjecting it to surface silanization treatment to obtain silanized sSiO2; mixing the polymerizable resin monomers, E-POSS, and the photoinitiator system, stirring in the dark until a homogeneous resin matrix is ​​formed; adding the obtained nMgO and silanized sSiO2 to the resin matrix in a specific ratio and mixing and dispersing evenly to obtain an uncured paste-like composite resin.

The invention relates to the technical field of electrode materials, in particular to a flexible supercapacitor electrode material and a preparation method thereof based on cyclic electrochemical deposition, and the method comprises the following steps: pretreating flexible carbon cloth to obtain modified carbon cloth; and preparing an aniline electroplating solution and a graphene oxide electroplating solution, and alternately electrodepositing a PANI layer and an rGO layer on the modified carbon cloth to obtain the electrode material with the PANI / rGOR layer. According to the flexible supercapacitor electrode material and the preparation method thereof based on the cyclic electrochemical deposition, the thickness and the proportion of the PANI layer and the rGO layer can be accurately adjusted by controlling the electrodeposition time, the potential and the cycle index, so that the PANI layer and the rGO layer are alternately deposited to form a compact and firmly-combined layered structure, and the flexible supercapacitor electrode material is prepared. And the peeling problem caused by the volume change of the PANI in the charging and discharging process is effectively relieved.

The utility model discloses a kind of spinal column medical teaching models, specifically related to medical teaching technical field, comprising: between adjacent cervical vertebrae, between adjacent thoracic vertebrae and between adjacent lumbar vertebrae are all fixedly connected by intervertebral disc;Cervical vertebra assembly is detachably connected with thoracic vertebra assembly by connecting mechanism, thoracic vertebra assembly is detachably connected with lumbar vertebra assembly by connecting mechanism, and lumbar vertebra assembly is detachably connected with sacral vertebra assembly by connecting mechanism;And, pressure monitoring system, the pressure monitoring system is used to monitor the pressure received by the surface of several intervertebral discs.The utility model detachably connects cervical vertebra assembly and thoracic vertebra assembly, thoracic vertebra assembly and lumbar vertebra assembly and lumbar vertebra assembly and sacral vertebra assembly;Realize the quick assembly between the components of teaching model: convenient for modular teaching demonstration;Adjacent vertebral body is all fixedly connected by intervertebral disc, guaranteeing mechanical stability: withstands torsional load when side bending angle is adjusted.

The invention discloses a robot optimal grabbing contact point matching and grabbing quality evaluation method and system, and the method comprises the steps: generating a spherical visual angle vector covering a potential grabbing direction of a target object and a corresponding grabbing approaching vector based on a three-dimensional point cloud of the target object; secondly, calculating the projection distance of each to-be-processed point on the surface of the object in each spherical visual angle direction, screening out a stable contact point pair with the maximum projection distance by combining with multi-dimensional physical constraints, and determining the grabbing width according to the stable contact point pair; then, candidate grabbing postures are constructed based on the contact point pairs and grabbing proximity vectors, the robustness of grabbing to the surface smoothness is evaluated by calculating the minimum friction coefficient, collision detection is carried out to guarantee operation safety, and whether the grabbing width meets clamping jaw physical limiting or not is verified. And finally, the above indexes are synthesized to screen out the grabbing posture which reaches the standard in the aspects of mechanical stability, collision-free feasibility and physical realizability. And through multi-dimensional evaluation, a robot grabbing scheme suitable for a complex scene is efficiently and reliably generated.

This invention relates to an ultra-high cell density organ module based on click chemistry photocurable hydrogel, its construction method, and its applications. The construction method includes: providing norbornene-modified high molecular weight hyaluronic acid with a high grafting rate and thiol-modified high molecular weight hyaluronic acid; mixing a photoinitiator, cells, HANb solution, and HASH solution; and rapidly cross-linking and curing the module through a click chemistry reaction after extremely short-term light exposure to form the organ module. This invention utilizes the synergistic effect of the high molecular weight hyaluronic acid host material and the high grafting rate modification to achieve the construction of an ultra-high cell density organ module under ultra-low photoinitiator concentration and extremely short light exposure conditions. The liver module constructed based on this method possesses extremely high cell density, good mechanical properties, and excellent liver function.

The invention belongs to the field of natural gas exploitation, and discloses a natural gas hydrate exploitation method for promoting carbon dioxide replacement by using organic matters. Belongs to the technical field of natural gas hydrate exploitation. Comprising the following steps: firstly, introducing methane gas into a high-pressure reaction kettle filled with organic matter-containing sediments at low temperature, and quickly reacting to obtain a hydrate-containing sediment reservoir; and then carbon dioxide is injected for replacement mining. By adjusting the type and concentration of organic matters in sediments, organic matter injection is simulated to promote carbon dioxide replacement and exploitation of natural gas hydrates. The organic matters in the process can effectively improve the mining speed and efficiency. The method is easy to implement, capable of remarkably improving the replacement efficiency and suitable for large-scale exploitation of the natural gas hydrate. Meanwhile, organic matters in natural soil are used in the method, so that the method has the advantages of rich resources, low price, environmental protection and no pollution, and shows a good application prospect.

The present invention proposes a multi-objective branch horizontal well trajectory design method, which belongs to the technical field of oil extraction and processing industry, and includes the following steps: S1: Based on geological characteristics and development goals, a wellbore trajectory scheme is formed; S2: A thin reservoir fishbone branch wellbore pressure drop model, a formation model, and a branch well productivity model are constructed; S3: A drill friction torque analysis is performed on the wellbore trajectory scheme, and the well inclination angle and the build-up rate are optimized; S4: The safety of the main wellbore horizontal section screen pipe under different well inclination angles and target front distances is analyzed, and the influence of different branch angles on the wellbore stability is analyzed by finite element analysis; S5: Multi-objective optimization is performed on the wellbore trajectory in the wellbore trajectory scheme, and the design parameters in the wellbore trajectory scheme are optimized. The present invention adjusts the wellbore trajectory parameters according to the analysis results, ensures the safety of the drill tool during the running-in process, reduces the risk of accidents during the drilling process, and effectively improves the drilling efficiency and mining benefits.

The application discloses a structure for preventing light guide from yellowing and aging, and relates to the technical field of automobile lighting. The structure comprises a substrate provided with LED chips, a silica gel lens covering the light emitting surface of the LED chips, and a light guide fixed above the substrate. The silica gel lens is in a semi-spherical structure, and an air gap is arranged between the highest point of the outer surface of the silica gel lens and the incident end surface of the light guide. The incident end surface of the light guide is provided with an optical tooth structure. The silica gel lens is preferably formed by curing high-refractive two-component silica gel. The application pre-converges light through the semi-spherical silica gel lens, realizes uniform total reflection of the light in combination with the optical tooth structure, and makes up for the light beam divergence loss caused by the air gap. Meanwhile, the air gap physically blocks heat conduction, reduces the heat load and high-temperature light radiation damage of the light guide, effectively solves the aging and yellowing problem caused by thermal deformation of the light guide, and improves the overall light efficiency and the service life of the lamp.

The utility model provides an accessory structure for invisible correction, which comprises an accessory body fixedly arranged on a dental surface, and the accessory body is T-shaped and / or L-shaped. The T-shaped accessory body comprises a vertical arm and a horizontal arm, the vertical arm is fixed with a tooth surface and forms a moment fulcrum on a gingival side / a coronal side, the horizontal arm is fixedly arranged at one end of the vertical arm and extends in a near-far middle direction to generate a bidirectional lever effect, and a connecting part is arranged at the joint of the vertical arm and the horizontal arm; the L-shaped accessory body comprises a long arm leading stress conduction in the horizontal direction and a short arm fixedly connected with one end of the long arm and used for limiting in the vertical direction, the problem of dentition adduction of a protuberant surface type is solved, occlusal plane adjustment is achieved through the synergistic effect of the accessory body and an implant anchorage, and the effect of improving the surface type of a patient is achieved.

The utility model belongs to the technical field of embedded channels, and discloses an adjustable embedded channel for a tunnel, which comprises a plurality of T-shaped embedded parts, an embedded channel body, a T-shaped bolt, a rotating hole, a rotating shaft, a connecting seat, a connecting plate and a C-shaped plate, a worm is rotatably arranged in the C-shaped plate, a worm gear ring is fixedly arranged on one of the T-shaped embedded parts, and the worm gear ring and the rotating shaft are concentrically arranged. The worm gear ring is matched with the worm, sliding seats are horizontally arranged at the two ends of the connecting plate in a sliding mode, the sliding direction of the sliding seats is perpendicular to the length direction of the connecting plate, fixing units are arranged on the sliding seats, sliding rods are vertically arranged on the sliding seats in a sliding mode, the top face of the pre-buried channel body is connected with the sliding rods, and a driving unit is arranged on the pre-buried channel body. The angle and two directions of the embedded channel body can be adjusted, and the T-shaped bolt is arranged on the embedded channel body, so that the adjusting range of the T-shaped bolt is wide, and it is ensured that the structure connected with the T-shaped bolt meets the design requirements in the aspects of positioning precision and mechanical stability.

The present application relates to railway roadbed technical field, disclose a kind of railway roadbed anti-seepage drainage system, comprising: solid waste base composite anti-seepage layer, solid waste base composite anti-seepage layer is set in the upper of road basic body along height direction;Hierarchical solid waste drainage layer, hierarchical solid waste drainage layer is set between solid waste base composite anti-seepage layer and road basic body;Slope anti-seepage slope protection layer, slope anti-seepage slope protection layer is set on roadbed slope;Intercepting and draining structure, intercepting and draining structure is set on solid waste base composite anti-seepage layer;Roadbed side drainage system, roadbed side drainage system is respectively communicated with hierarchical solid waste drainage layer, slope anti-seepage slope protection layer and intercepting and draining structure, suitable for collecting liquid from hierarchical solid waste drainage layer, slope anti-seepage slope protection layer and intercepting and draining structure and leads to the range of roadbed. Hierarchical solid waste drainage layer rapidly leads to drainage leachate, cooperates with roadbed side drainage system to collect and process, reduces water body invasion risk. Slope anti-seepage slope protection layer intercepts slope water body penetration, leads into drainage system, prevents penetration road basic body.

This invention relates to the field of toughening agent technology, specifically a high-transparency, cold-resistant toughening agent for polyester materials and its preparation method. By weight, it comprises 50-90 parts PET, 10-40 parts PETG, 1-10 parts high-transparency TPEE, 1-5 parts TPEE-g-MAH, 0.3-6 parts composite plasticizer, 0.1-0.5 parts nucleating agent, and 0.1-0.5 parts antioxidant. The preparation method includes: raw material drying, additive premixing, mixing the base material and additives, melt extrusion, and cooling pelletizing. This invention, through the synergistic effect of high-transparency TPEE and the specific compatibilizer TPEE-g-MAH, achieves nanoscale dispersion and strong interfacial bonding while solving the technical problem of "toughening inevitably reducing transparency" in traditional toughening materials. This results in a material with a low-temperature impact strength of 110-150 kJ / m² at -30°C, while maintaining a light transmittance ≥90% and a haze ≤2%. It is particularly suitable for PET products requiring high transparency and low-temperature impact resistance.

The application belongs to the technical field of composite materials, and particularly relates to a hybrid continuous fiber 3D printed double-diagonal reinforced bionic lattice composite structure, a tough phase outer frame constraint structure, and a high-strength bearing core structure. The tough phase outer frame constraint structure is a simple cubic lattice configuration and is made of continuous glass fiber reinforced polyamide composite material. The high-strength bearing core structure is a double-diagonal line topology configuration of a deep-sea glass sponge and is made of continuous carbon fiber reinforced polyamide composite material. The application adopts a differentiated material layout strategy of "high toughness of outer frame and high strength of core body", prepares the outer frame constraint structure by using CGF / PA high-toughness composite material, effectively disperses external impact load, delays initial cracking of the structure, reduces the initial peak force of compression, and inhibits local stress concentration and micro-defect expansion on the basis of excellent fracture toughness and deformation adaptation characteristics.

This invention relates to the field of pile foundation construction technology and discloses an intelligent management and control system for pile foundation construction that coordinates karst cave detection and mud control. The system includes a multi-source data synchronous acquisition module, a fluid resistance adaptive calibration module, a parasitic torque decoupling module, a formation energy fingerprint identification module, and a fluid-structure interaction decision module. The acquisition module constructs a full-dimensional state vector; the calibration module calculates the working condition correction coefficient; the decoupling module removes the fluid parasitic torque to output the net cutting torque; the identification module calculates the corrected mechanical specific energy and the normalized change gradient; and the decision module calculates the formation equivalent hydraulic impedance, integrates mechanical and hydraulic characteristics to generate a karst cave critical breakdown early warning index, and outputs pressure regulation and flow compensation commands when the index exceeds the limit or the impedance is abnormal. This invention achieves proactive early warning of karst cave penetration risk and intelligent control of mud pressure by decoupling fluid resistance interference and coupling dual-physics field characteristics.

The invention relates to the technical field of high polymer materials, and discloses a water-based hybrid emulsion with high solid content, low gloss and high wear resistance and a preparation method thereof.The water-based hybrid emulsion is prepared from 12 kinds of components including composite isocyanate, composite polyol, composite acrylate monomers and the like. A three-in-one system of an interpenetrating network, a core-shell structure and multiple cross-linking is constructed through precise compounding, the synergism of 55-60% high solid content, 5-8 GU low gloss and high wear resistance is realized, the weather resistance of the product reaches 800 h without yellowing, the product is stable after being stored for 12 months, the product is environment-friendly and solvent-free, and the product can be widely applied to multiple scenes such as coatings, adhesives, leather finishing and the like and has wide application prospects. The problems that an existing water-based hybrid emulsion is single in structure, short in performance, high in solid content and difficult to be compatible with a complex structure are solved.