16results about How to "Ensure mechanical stability" patented technology

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 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 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.