186results about How to "Avoid internal stress" patented technology

The invention relates to the field of an infrared detector, in particular to a micromachined thermopile infrared detector. The manufacturing technique is simplified and the performance and finished product rate are improved. The manufacture of the micromachined thermopile infrared detector comprises the following steps of: (1) depositing silicon nitride film on the both sides of a silicon substrate by an LPCVD method; (2) etching to remove peripheral silicon nitride film on the frontal side of the silicon substrate by lithography; (3) manufacturing a plurality of Poly-Si strips both ends of which are respectively arranged on the silicon nitride film and the silicon substrate by LPCVD method and photolithographic process; (4) manufacturing a plurality of aluminum strips which form a thermocouple with the plurality of Poly-Si strips by sputtering and photolithographic processes; (5) depositing the silicon nitride film on the frontal side of the silicon substrate by PECVD method; (6) manufacturing an infrared absorption layer (a carbonized photoresist layer) covering the hot junction area of the thermopile with photolithographic process; (7) manufacturing a metal reflective layer (a metal layer) covering the cold junction area of the thermopile with lift-off process; and (8) eroding the back side of the silicon substrate to form a square frustum pyramid shaped groove. The micromachined thermopile infrared detector has reasonable structure design, simple manufacturing process, high detector performance, high finished product rate, good development prospect and is easy to realize.

The invention relates to a bending-resistant multi-mode fiber used in an access network or a miniature optical device. The bending-resistant multi-mode fiber comprises an optical fiber and a coating coated on the outer surface of the optical fiber, wherein the fiber consists of a quartz glass core layer which has a section structure with a parabolic shape or step-type refraction index and a quartz glass cladding which surrounds the core layer. The optical fiber is characterized in that: the core layer has a diameter of between 20 and 200 mu m and consists of a germanium-and-fluorine-doped quartz glass material; and double solidified polymer coatings are coated out of the cladding, wherein an inner coating coated on the outer surface of the cladding is a low-refraction index flexible polymer coating while an outer coating is a high-Young's modulus polymer coating. Because of the design of the low-refraction index inner coating, an internal stress of the optical fiber is avoided, the mechanical performance of the optical fiber is greatly improved, and the use performance and the service life of the optical fiber working in a small-radius bending state are ensured. The bending-resistant multi-mode fiber has high bending-resistant performance; and at a wavelength of 850 nm, the additional attenuation of the bending caused by winding 1 circle with a bending radius of 10 mm is less than or equal to 0.15 dB. The bending-resistant multi-mode fiber has the characteristic of simple, convenient and effective manufacturing method, and is suitable for large-scale production.

The invention relates to a method of preparing a multi-component super-hard reaction film for a multiple-arc ion-plated nitride of titanium, aluminum, chrome, silicon and yttrium. The method includes the following steps in sequence: the confirmation of the deposition technique and the design of the components of the target material (1); the preparation of a alloy target (2); the selection and pre-processing of a workpiece sample (3); the confirmation of the quantity of the electric arc source (4); the confirmation of the deposition technique (5); the acquirement of a transition layer (6); the processing of vacuum heating (7) and the rotation of the workpiece sample. The method confirms the variation range of the components of the Ti, Al, Cr, Si, Y elements in the complex Ti-Al-Cr-Si-Y alloy target and causes the super-hard reaction film of the (TiAlCrSiY)N to have the advantages of strong adhesive power (larger than or equal to 180 N) and high hardness (larger than or equal to HV3200).

The invention concerns a respiratory ventilation connector for connection in the flow path between a patient interface and one or more fluid conduits in a respiratory ventilation system. The connector has first and second opposing body portions joined together so as to define a connector body having a first port, a second port and an internal passageway for fluid communication between said first and second ports. Each body portion has respective first and second spigot portions arranged in use to form an upstanding circumferential spigot formation about the first port. The spigot formation has an internal diameter which is greater than the diameter of the port so as to allow reception of a tubular fluid conduit within the spigot for communication with the first port in use.

The invention discloses a parking connecting structure of a suspension type monorail vehicle and the suspension type monorail vehicle. The parking connecting structure of the suspension type monorail vehicle comprises a connecting rod, a connecting seat and a connecting beam, wherein the connecting rod is used for transmitting vertical loads, longitudinal traction brake force and transverse swinging force between a suspension type vehicle body and a traveling component, the upper end of the connecting rod is used for being fixedly connected with the traveling component, the lower end of the connecting rod is hinged to the connecting seat, and the connecting seat is fixedly connected with the connecting beam. The parking connecting structure of the suspension type monorail vehicle realizes non-rigid connection between the suspension type monorail vehicle body and a bogie, and internal stress caused by movement of the suspension type monorail vehicle body is solved.

The invention discloses a high-tenacity oxidation-resistant anti-friction coating on a substrate surface and a preparation method thereof. The coating is characterized in that nano-crystalline AlCrCN particles of a face-centered cubic structure are embedded into grids of diamond-like carbon with nano-thickness to form the composite coating, wherein the diameter of each nano-crystalline AlCrCN particle is 5-50 nanometers, the thickness of each grid of the diamond-like carbon is 1-5 nanometers, and the molar ratio of Al atoms to Cr atoms is greater than 1. The coating has higher oxidation resistance, also combines higher tenacity of ceramic composite materials and excellent friction performance of diamond-like carbon, can reduce the adhesion between abrasive dust and a substrate, is suitable for surfaces of cutters, molds and other substrates, and is especially suitable for low-speed processing of titanium-nickel alloy.

The invention discloses a mounting structure of an anti-explosion glass curtain wall. The mounting structure comprises a building body, curtain wall glass mounted on the building body and a mounting base plate, a decorating frame is covered on the outer wall surface of the curtain wall glass, the curtain wall glass is adjusted to a preset position via the mounting base plate and then fastened, the position of the curtain wall glass is not changed during fastening, and the decorating frame is fixed on the mounting base plate via a mounting piece. The curtain wall glass with edges covered by a prestressed structure is firmly fastened via a stand column and crossbeam frame, and in case of glass crushing or deformation caused by impact, and the glass cannot be integrally separated from the stand column and crossbeam frame, so that anti-explosion and separation functions are effectively realized, and indoor persons are protected to the greatest extend; since profile steel serving as the stand column and crossbeam frame is adopted to replace an existing aluminum profile frame, strength and rigidity of a whole curtain wall bearing system are greatly enhanced, and the anti-explosion glass curtain wall structure is stronger in capability for bearing impact loads from explosion and the like and good in safety performance.

The invention provides a preparation method of a polyurethane elastomer, relating to polymers. The invention provides a preparation method of a polyurethane elastomer which has excellent impact resistance and machining characteristic and is especially suitable for preparing transparent polyurethane glasses frame products with high yields and low defects. The preparation method comprises the following steps: 1) preparing a prepolymer: mixing isocyanate with polyols to react to obtain the prepolymer; 2) preparing a curing agent: specifically, dehydrating the polyols, catalysts and anti-aging agents until the mass percent of the moisture is smaller than 0.05%, and adding chain extenders after reducing the temperature, thus obtaining the curing agent; and 3) mixing the prepolymer with the curing agent, then carrying out vacuum defoaming, injecting a reactive mixture after vacuum defoaming into a mold, then putting the mold in a microwave environment to be heated, and carrying out demolding, thus obtaining the polyurethane elastomer. The preparation method has the advantages of good processing properties, low material operating temperature, controllable operating time, high production efficiency and high yield.

The invention discloses a construction method of a suspended steel gallery. The suspended steel gallery is connected between main body structures; a preassembled bar is firstly arranged at designed elevation of the suspended steel gallery, a lifting platform is arranged, and meanwhile, a hydraulic lifter is arranged; an upper truss structure of the suspended steel gallery is spliced on the ground, the hydraulic lifter is debugged to lift in a segmented manner, wherein the lifting height of each time is the height of one layer of suspended structure; and the suspended steel gallery is lifted to the elevation for welding after assembly is completed. According to the method, one-time overall lifting method of the multi-layer suspended steel gallery is changed into a hydraulic multi-time segmented lifting method, so that large-range reinforcement of a basement roof is avoided, the construction period is shortened, the cost is reduced, the designed mechanical principle is matched and stress deformation and internal stress generation of a suspended structure are avoided. The appearance quality of the steel gallery and the quality of a welding line and a member meet the national current acceptance standard requirements; and the design idea is achieved.

The invention provides an MEMS device and a forming method thereof. The device includes a vibrating membrane forming on a substrate. The vibrating membrane includes a first protrusion and a second protrusion that protrude in opposite directions. The first protrusion protrudes toward the substrate. Among a plurality of protrusions, the protrusions respectively extend in two different directions, thereby avoiding occurrence of internal stress in a corresponding direction due to the corrugation. Therefore, the internal stress in the vibrating membrane can be effectively released when the vibrating membrane is formed, and additional generation of the internal stress can be prevented, so that the formed deformation amount of the vibrating membrane is improved, and the sensitivity of the MEMS device is improved.

The invention discloses a method for preparing cellulose fibers by dry-wet spinning. The method comprises the following steps: dissolving cellulose fibers in phosphoric acid/polyphosphoric acid compound solution and preparing the original liquid glue in the liquid crystal state by using a double-screw extruder; preheating the original liquid glue and then feeding to a metering pump; adjusting glue feeding quantity; spraying out the original liquid glue through a spinneret plate; allowing the original liquid glue to be subjected to air bath, first coagulating bath and second coagulating bath successively, wherein the air gap is 3-50mm and a solution comprising three components is used in each of the first coagulating bath and the second coagulating bath; carrying out water washing, neutralization, hot water washing, oil applying, drying, winding and the like to prepare the finished fire. The method is characterized in that filament spinning and forming time is short; filaments are formed quite uniformed; production efficiency is high, the fiber index is excellent and the like; no by-product is generated; the environment is less polluted; and cost is low.

The invention discloses a micro silicon microphone and a manufacturing method thereof. And the microphone and the method are used for solving a technical problem that a micro silicon microphone stress influences sensitivity and a manufacturing technology. The micro silicon microphone comprises a vibrating membrane layer. The vibrating membrane layer comprises a vibration beam and a vibration membrane. The vibration beam is uniformly arranged around an edge of the vibration membrane. One end of the vibration beam is fixed to the edge of the vibration membrane and the other end of the vibration beam is fixed to a support structure.

The invention discloses an accurate control system and method for synchronous jack-up main jacks for an aircraft. The control system comprises at least three main jacks and further comprises a PLC controller electrically connected with each main jack, and a control end electrically connected with the PLC controller, wherein each main jack is equipped with a servo driver, the servo drivers are electrically connected with servo motors of the main jacks, a pipeline on which the servo motors are communicated with main jack acting cylinders is further provided with a proportion valve and an electromagnetic valve, pull wire sensors are further connected between supporting heads of the main jack acting cylinders and the main jack acting cylinders, and the servo drivers, the proportion valve, theelectromagnetic valve and the pull wire sensors are electrically connected with the PLC controller. The accurate control system is advantaged in that an automatic full-machine synchronous jack-up modeis employed, labor intensity of the aircraft staff is greatly reduced, the preparation time for military aircraft maintenance is shortened, and economic benefits of civil aircrafts are improved.

The invention discloses a steam type high fineness and no-weldlines injection moulding process for a complex precise plastic product. The process comprises the following steps: (1) material selection; (2) backheating treatment; (4) mold preheating; (5) die assembly and quick heating; (6) speed-regulating and pressure-regulating injection in stages; (7) quick cooling; and (8) mold opening to take piece. According to the process disclosed by the invention, corresponding backheating treatment is performed on a material body, so that the internal stress problem of the material body is solved; then, an injection mold is of a design of a hot runner and a cold runner multipoint feeding subsurface gate, and meanwhile, the travel times of the corresponding hot runner and cold runner are added for a key portion of a product, so that the problems that a plastic melt is slow to flow at a far end to generate sink marks and the internal stress exists and the like are solved, and therefore, the appearance quality and the forming percent of pass of the product are extremely improved, the process cost and the like are reduced, and the actual using demand is met.

The invention provides a wood modifying reinforcer. The wood modifying reinforcer comprises a component A, a component B and a component C, wherein the component A comprises 60-90 parts by weight of modified polyurethane resin, 0.6-1.0 part by weight of a defoaming agent, 0-1 part by weight of a dispersing agent, 0.2-0.5 part by weight of a flatting agent, 0-1 part by weight of bentonite and 0-30 parts by weight of talcum powder; the component B is isocyanate polymer; and the component C is a diluent. The wood modifying reinforcer provided by the invention is extremely strong in permeability to a wood substrate, can obviously stabilize moisture content of wood, and can slow down changes of moisture content, so that inner stress generated by rapid changes of moisture content inside the wood is reduced, the wood cracking and bending problem is prevented, and the effect of sealing tannic acid further can be remarkably achieved; and the treated wood is almost free of resin residues on surface, and is free of an obvious reinforcing phenomenon, so that convenience is provided for a follow-up processing process.

The invention relates to a single-component room temperature vulcanized silicon rubber for sticking an insulator, which belongs to the technical field of an adhesive for sticking the insulator and mainly solves the problems of the existing adhesive of being poor in leveling property, low in adhesive strength and slow in curing. Components of the single-component room temperature vulcanized silicon rubber for sticking the insulator comprise 100 parts of monohydroxyl-terminated polydimethylsiloxane polymer, 10-15 parts of gas phase white carbon black, 18-25 parts of silicone oil plasticizer, 6-10 parts of cross-inking agent, 1.7-4 parts of coupling agent, 10-15 parts of mineral oil and 0.1-1 part of catalyst. The single-component room temperature vulcanized silicon rubber has good leveling property, is high in adhesive strength, fast in deep curing, convenient to construct and operate and widely applicable to sticking and assembling of the insulator.

The invention relates to a decorative part (1, 3, 5) including several stones (2) and a device (7, 7′, 47, 47′) for securing the stones (2) in relation to each other. According to the invention, the securing device (7, 7′, 47, 47′) includes a single electrodeposited base (9, 9′, 49, 49′) whose shape matches one part of the stones, allowing all the stones (2) to be attached in relation to each other without any stress, and the girdles (6) of the stones (2) are mounted edge-to-edge in relation to each other so that said single base is concealed.

The invention also relates to the method for manufacturing a part (1, 3, 5) of this type.

The invention concerns the field of pieces or jewellery or timepieces.

The invention provides a preparation method of a metal organic framework/nanofiber with a bead-like structure, and belongs to the technical field of nano material preparation. The method includes the following steps: firstly, bridging metal salt nodes on the surfaces of metal/PAN nanofibers with 2-methylimidazole in a solution for coordination, and generating ZIF particles distributed along the nanofibers in an in-situ one-time growth manner; and then adding a metal salt solution, wherein metal ions enriched on the surfaces of the fibers and the organic ligands are subjected to a strong cross-linking effect, and a ZIF/PAN nanofiber composite material with a layered heterostructure is obtained through in-situ secondary growth. The method can promote the uniform growth of ZIF particles along the orientation of the nanofibers, so that more crystal face positions are exposed, the crystal face utilization of the ZIF is maximized, the specific surface area and the activity are greatly improved, and the application field of the ZIF is expanded. The method is simple, the process is controllable, the problems of MOF particle aggregation, MOF derivative structure collapse and the like are greatly solved, the method can be applied to the field of fuel cell catalysis, and the catalytic activity and stability are improved.

The invention relates to a crossbeam (2) in an automobile, especially a crossbeam (2) of a driver's cab, the longitudinal end of the crossbeam (2) is connected with the A-pillar of the front vehicle structure (1) of the automobile, and the crossbeam (2) Supported at its center (4) on the longitudinal center tunnel (6) of the vehicle by means of a bracket (5), wherein the bracket (5) has two downward supports (7, 7') and a connecting beam (8), said connecting beam (8) connects the lower ends of said two supports (7, 7'), the invention proposes that said connecting beam (8) can be passed through at least one fixing device (9 ) is fixed on the longitudinal central channel (6), and the fixing device (9) enables the connecting beam (8) to be adjustable on the longitudinal central channel (6) of the vehicle. This enables a stress-free and simple assembly of the cross member (2).

The invention relates to an offshore wind turbine as well as a blade damage preventing device and method. Surface pressure on blades can be sensed by pressure sensors. When the blades are hit by falling snow or raindrops, the surface pressure on the blades is increased until preset conditions are met, and thus a trigger signal is sent out. Further, a controller sends out a vibration signal, vibrators arranged in the blades produce vibration at the vibration frequency. The falling snow and the raindrops which hit the blades can be thrown off and can be prevented from being attached to surfaces of the blades through vibration and high-speed rotation of the blades. The falling snow and super-cooled water drops are major causes for icing of the surfaces of the blades. Besides, vibration produced by hitting of the raindrops can be offset by vibration of the blades, so that the internal stress is prevented from being accumulated in the blades. Thus, with the blade damage preventing device and method, icing and the internal stress can be effectively prevented.

The invention provides a method for realizing co-curing of an L-shaped reinforcing rib and a C-shaped frame-structure composite part through a high-strength soft tool. The method has the beneficial technical effects that first, co-curing of the L-shaped reinforcing rib and the C-shaped frame-structure composite part is achieved through the cooperation of a soft mold and a metal forming tool, it isguaranteed that the key parameters, such as the profile tolerance, thickness and the L-shaped axis, of the part all meet the high civil aviation manufacturing standard, and the problem of aging caused by repeated curing of materials is solved; second, in the forming process, pressure is uniformly and accurately applied to all positions of the L-shaped vertical rib and a C-shaped frame, and the temperature rise rates of all the portions of the part are kept consistent, so that the problem that the thickness of an R-angle area of the part is out of tolerance is solved; and third, non-cured preforms of the L-shaped vertical rib and a C-shaped web are combined through the soft tool, so that internal stress caused by combination after curing of an assembly is avoided, and the problems of out-of-tolerance profiles and internal non-destructive defects caused by forced assembly in the prior art are solved.

The invention relates to copper alloy die-casting die steel and a manufacturing method of the copper alloy die-casting die steel, and belongs to the technical field of steel and iron materials. The steel is hot work die steel with high-hardness high-heat-stability hard boride strengthening phases distributed on a single Austenite base body, the steel does not contain W, Mo, V, Co and other metal. Chemical compositions of the steel comprise, by weight, 0.3 percent to 0.6 percent of C, 0.1 percent to 1.2 percent of Si, 6.0 percent to 14.0 percent of Mn, 8.0 percent to 16.0 percent of Cr, 3.0 percent to 8.0 percent of Ni, 0.5 percent to 1.0 percent of Cu, 0.1 percent to 0.8 percent of B, P smaller than 0.015 percent, S smaller than 0.015 percent and the balance Fe. According to the method, raw materials are smelted, casting and ingoting are carried out under the argon atmosphere protection, and the copper alloy die-casting die steel is obtained after heat treatment and forging treatment. According to the high-temperature mechanical property of the copper alloy die-casting die steel, the 850 DEG C high-temperature tensile strength is 200 MPa to 310 MPa, the yield strength is 160 MPa to 200 MPa, the 850 DEG C high-temperature compressive strength is 270 MPa to 310 MPa, and the yield strength is 170 MPa to 210 MPa. Under the same test condition, the high-temperature tensile strength and the high-temperature compressive strength of the copper alloy die-casting die steel are obviously higher than those of H13 steel

The invention discloses a suspension type monorail vehicle body and cross beam connection structure and a suspension type monorail vehicle. The suspension type monorail vehicle body and cross beam connection structure comprises connection plates fixed to the two ends of an edge beam of a top cover of a suspension type vehicle body, and a cross beam used for being fixedly connected with a traveling component. Barbs are arranged on the inner side faces of the tops of the connection plates. End plates are arranged at the two ends of the cross beam. The top of each end plate is located in the barb of the corresponding connection plate. Each end plate is fixedly connected with the corresponding connection plate. Preferably, the cross beam and the end plates are of an integrally formed structure. Through the arrangement of the barb structure, the cross beam is matched with the barbs of the connection plates, so that connection between the cross beam and the suspension type vehicle body is more reliable, and meanwhile the independence on the welding mode is avoided.

The invention provides a lifting device and a long steel rail transport vehicle set, wherein the lifting device comprises a hydraulic power component and a clamping component; the hydraulic power component is movably arranged on the long steel rail transport vehicle set and can move horizontally and vertically relative to the long steel rail transport vehicle set; the clamping component is connected with the hydraulic power component; the hydraulic power component drives the clamping component to move; and the clamping component is used for clamping steel rails. According to the lifting device, the hydraulic power component serves as a power source, the hydraulic power can be controlled precisely, the movement is sensitive, and a rigid acting force can be provided, so that internal stresses of the steel rails in a curve state are overcome in the handling process, the probability of shaking and straightening trends of the lifting device is low, and the safety in the operation process is improved.