118results about How to "Good structural stability" patented technology

The invention relates to an anode material of a lithium-sulfur battery, the lithium-sulfur battery and a method for preparing the anode material, and belongs to the field of battery materials. The center of the anode material is made of a functionalized carbon nano-material, the middle interlayer is made from sulfur, and the outer layer adopts a polydopamine film, wherein the functionalization method is hydroxylation or carboxylation. The preparation method comprises the following steps: dissolving the carbon nano-material in an alkaline or acid liquid to obtain the functionalized carbon nano-material; adding the functionalized carbon nano-material in a sulfur water solution, stirring, dropwise adding diluted acid to the solution, and obtaining the functionalized carbon nano-material coated with sulfur on the outer side; adding the functionalized carbon nano-material coated with sulfur on the outer side in a tris(hydroxymethyl) methane buffer solution, and performing a polymerization reaction to a dopamine hydrochloride solution, so as to obtain the anode material. The invention further relates to the lithium-sulfur battery using the anode material. The battery can further comprise a polyethylene diaphragm modified by polydopamine. The anode material can inhibit the shuttle flying effect and the structural damage caused by volume expansion; and the lithium-sulfur battery is good in cycle performance and capacity retention ratio.

The invention provides a high-energy-density multi-element positive electrode material and a preparation method thereof. The positive electrode material is composed of a substrate with a chemical formula Li1+a[(Ni1-2xCoxMnx)1-yMy]1-zM'zO2, and Li8ZrO6 and a lithium ion conductor LiuM''vOw which coat the surface of the substrate, wherein a is greater than or equal to -0.5 and is less than or equalto 0.3, M and M' are at least one element in La, Cr, Mo, Ca, Fe, Hf, Ti, Zn, Y, Zr, Si, W, Nb, Sm, V, Mg, B and Al, M'' is at least one element in Zr, Ti, Al, Si, Mn and Sn, and the total coating amount of a composite oxide is 0.01-3% of the molar weight of the substrate. The positive electrode material disclosed by the invention has relatively high energy density and cycling stability, and can beused for a lithium ion power battery. The preparation method of the material is simple in process, low in cost and suitable for large-scale production.

The invention relates to a non-woven material reinforced tissue engineering composite three-dimensional scaffold and a preparation method thereof. The non-woven material reinforced tissue engineering composite three-dimensional scaffold is composed of a non-woven material reinforcer and a natural biomaterial free-dried scaffold. The preparation method comprises the following steps of (1) preparing fibers into the non-woven material by use of the non-weaving technology; (2) immersing the non-woven material in the prepared aqueous solution of the natural biomaterial; (3) removing moisture by use of the free-drying technology; (4) immersing the natural biomaterial in a crosslinking agent, thereby obtaining the non-woven material reinforced tissue engineering composite three-dimensional scaffold. The preparation method of the non-woven material reinforced tissue engineering composite three-dimensional scaffold is simple to operate, high in stability, free from use of an organic solvent in the whole process, and environmental friendly and safe; the prepared three-dimensional tissue engineering composite scaffold is excellent in mechanical properties; the fibers in the non-woven material and the natural biomaterial part in the scaffold are closely bonded together, so that the structural stability of the scaffold is effectively improved and the mechanical properties of the scaffold are enhanced.

The invention provides a large-capacity power lithium battery which can be used in the field of vehicles as a power source and a preparation method thereof. The large-capacity power lithium battery of the invention is prepared by stacking and packaging a positive electrode, the thin film of a gel-state polymer electrolyte and a negative electrode, wherein the active material of the negative electrode is modified lithium titanate, the active material of the positive electrode is one or more of a ternary material, lithium manganate and ferric lithium manganate, and the thin film of the gel-state polymer electrolyte is prepared by mixing and drying a lithium salt, the solution of an organic solvent and a conductive polymer solution. The power lithium battery has the characteristics of environmental friendliness, excellent high magnification performance, excellent heat dispersion and the like. The preparation is simple, environmental pollution and leakage do not exist, the storage service life is long, enlargement is easy and the temperature range for use is wide. The large-capacity power lithium battery can be used as the power source and applied to the fields such as hybrid electric vehicle, electric vehicle and the like.

The invention discloses a polyurethane modified calcium alginate gel microballoon and a preparation method thereof. The preparation method comprises steps of synthesis of double bond-terminated polyurethane prepolymer and graft modification of calcium alginate. By utilizing a polyurethanes prepolymer side chain, a crystallization area is formed in the interior of natural polysaccharides material calcium alginate gel so as to affect the arrangement of adsorption sites, so that the target molecules can be combined in order in a base material. A single combination form is provided for the target molecule, and the identification selectivity and combined quantity of an imprinted material is improved; the formation of the crystallization area is used as a physical cross linking point, so that the gel material is stable in structure and is improved in resistance to swelling; and the preparation method diversifies the modification methods for natural polysaccharides and provides a new thought for the development, modification and application of marine plants and animals.

The invention discloses a lithium ion battery diaphragm for overcharge protection and a preparation method thereof. After electrically active polyfluorene polymers, inactive polymers and pore-forming agents are mixed, an electrostatic spinning method is used to prepare and obtain a lithium ion battery diaphragm of different structures. Since the electrical conductivity of the diaphragm changes with voltage, the diaphragm is capable of reversibly changing between insulation and conductivity; the overcharge protection safety of a battery is improved; the interface impedance and reaction impedance of a composite diaphragm are reduced; when large current overcharge occurs to the anode materials of the battery, the diaphragm maintains excellent structural stability and electrochemical performance. The invention has the advantages of simple preparation process, low cost and good effect, and is conducive to industrial production.

An altered capsid protein of a primate-infective papovavirus in which a foreign peptide sandwiched by 1 to several glycine residues at each end is inserted into at least one of the DE-loop or the HI-loop of the capsid protein of the primate-infective papovavirus, and a virus-like particle formed from the altered capsid protein.

The invention discloses multiphase composite system infrared radiation ceramic powder applicable to products, such as infrared radiation energy-saving coating, an infrared radiation heater and the like, of a high-temperature industrial kiln (boiler). The multiphase composite system infrared radiation ceramic powder is prepared from the following raw materials in percentage by mass: 20 to 80 percent of spinel type solid melt ceramic powder, 6 to 60 percent of Al2O3, 5 to 56 percent of SiO2, 0 to 10 percent of MgO, 0 to 3 percent of BaO, 0 to 3 percent of CaO and 0 to 6 percent of TiO2, whereinthe spinel type solid melt ceramic powder is prepared from the following raw materials in percentage by mass: 0 to 60 percent of Fe2O3, 0 to 60 percent of MnO2, 0 to 12 percent of CuO, 0 to 10 percent of Co2O3, 0 to 6 percent of Mo2O3, 0 to 6 percent of NiO, 0 to 5 percent of V2O5 and 0 to 5 percent of WO3. The invention also discloses a preparation method of the multiphase composite system infrared radiation ceramic powder. All the raw materials are the common raw materials with wide sources; a spinel-silicate multiphase composite system has a stable structure, excellent infrared radiation property, can adjust the structure and the property of the materials easily by controlling the components, and has a wide application prospect.

The invention discloses a paper faced gypsum board suspended ceiling construction technology, and relates to the technical field of suspended ceiling construction. According to the key points of the technical scheme, the paper faced gypsum board suspended ceiling construction technology includes the following steps of measuring and snapping of a line, installation of a suspender, installation of amain keel, installation of an auxiliary keel, installation of a paper faced gypsum board, facing of paper faced gypsum board and cleaning. The suspended ceiling formed by the construction steps has the effects that quick positioning and installation are convenient, it is ensured that after the paper faced gypsum board is installed, the stress is uniform in all directions and the dislocation, deformation, distortion and the like caused by the uneven stress of the paper faced gypsum board are avoided, moreover, the overall structure of the suspended ceiling is good in fixing effect, high in theinstallation efficiency, the paper faced gypsum board is not prone to falling off, and the overall flatness and appearance effect of the suspended ceiling are improved.

The invention discloses a greening revetment of hydraulic engineering. The greening revetment includes a dam, an upper slope, a platform, and a lower slope; the upper slope, the platform and the lowerslope are composed of a gravel layer, a steel wire mesh layer and a concrete pouring layer arranged in sequence from inside to outside; a first water collecting groove and a lamp pole are arranged onthe dam, the bottom end of the first water collecting groove is provided with a first water drainage channel, the dam is internally provided with a second water drainage channel and a second water collecting groove communicating with the first water drainage channel, a water suction pump is arranged in the second water collecting groove, and the output end of the water suction pump is connected to a water supply pipe extending out of the first water collecting pump; and the lamp pole is provided with a solar panel, lighting lamps, and a control box, a greening layer is arranged on the upper slope, and the platform is provided with a water drainage groove and a handrail. The greening revetment of hydraulic engineering has the beneficial effects of simple structure and high practicability.

The invention discloses a temperature-compensated optical current measurement module and a temperature-compensated optical current transformer. The optical current measurement module comprises an incident optical fiber used for being connected with a light source, and an emergent optical fiber used for being connected with an optical signal demodulator. A first self-focusing lens, a polarizer, a magneto-optic glass, an analyzer and a second self-focusing lens are sequentially arranged between the incident optical fiber and the emergent optical fiber. The surface of the magneto-optic glass is provided with a temperature sensor used for measuring the internal temperature of the magneto-optic glass. According to the invention, the temperature sensor is arranged on the surface of a measurement optical element to measure the internal temperature of the magneto-optic glass and sense the temperature change of the magneto-optic glass, measured current sensed by the magneto-optic glass is demodulated from an emergent optical signal E2, and then the coefficient of the Faraday magnetic declination of the magneto-optic glass is corrected through temperature compensation, thereby realizing accurate current compensation measurement. The optical current measurement module has high structural stability and high measurement precision, and has the characteristics of large dynamic range of measurement, no magnetic saturation, wide measurement frequency band and wide temperature range.

The invention relates to a preparation method of an LaNiO<3> submicron microsphere electrode material with a hollow structure. The method comprises the steps as follows: La(NO<3>)<3>.9H<2>O and Ni(NO<3>)<3>.6H<2>O are dissolved into isopropanol at the molar ratio of 1 to (1-0.8) and stirred to form a transparent solution; glycerin is added until the volume ratio of the glycerin to the isopropanol is 1 to 4; the solution is stirred to form a homogeneous suspension; the solution is enclosed into a reaction kettle for reaction at a reaction temperature of 120-250 DEG C for 6 hours; the solution is centrifuged and centrifugally washed with ethanol for 3-4 times; the product is put into an oven at 70 DEG C for drying for 12 hours or more; the heating rate of the obtained reaction product is 1 DEG C/min; the thermal treatment temperature is 550-650 DEG C; the thermal treatment time is 6-10 hours; and the product is fabricated into an electrode by a sheet driving method. The specific capacity of the LaNiO<3> submicron microsphere electrode material can be 408F/g at 20A/g under a high-current discharge condition and can still reach 82% of initial capacity at 2A/G after 5,000 cycles.

The invention discloses a Ni/NiFe2O4 lithium ion battery anode material synthesized by a bimetallic MOF precursor and a preparation method thereof. The Ni/NiFe2O4 electrode material is composed of elementary substance Ni and NiFe2O4. The preparation method is characterized by constructing a Ni-Fe-MOFs precursor by using soluble nickel salt and iron salt as main raw materials, by using amino terephthalic acid as a ligand, and by using a solvothermal method; and further drying and calcinating the Ni-Fe-MOFs precursor to obtain the Ni/NiFe2O4 electrode material. The Ni/NiFe2O4 synthesized by themethod of the invention has a uniform shape and size of about 200-400 nm, has dispersed Ni and NiFe2O4, a high specific surface area, a high porosity, and a good electron conductivity, can provide a good transmission channel for lithium ions, and thus exhibits excellent structural stability, cycle performance and rate performance as the lithium ion battery anode material. The method of the invention is simple in process, low in equipment requirements and low in cost. The obtained Ni/NiFe2O4 lithium ion battery anode material has a good application prospect.

The invention relates to barium sulfate and a preparation method thereof, and in particular relates to barium sulfate with low density and a hollow structure. The preparation method comprises the following steps: performing emulsification treatment on a barium source solution by using an emulsifying agent; coating an oil core material by using the barium source solution so as to form a liquid bead with an oil-in-water structure; enabling the atomized liquid bead to be subjected to vulcanization and oxidation by virtue of sulfur dioxide gas and oxygen respectively by using an atomizing nozzle,, namely, firstly dissolving the sulfur dioxide gas into the liquid bead to form sulfite, enabling sulfite to react with barium ions to generate barium sulfite, then rapidly oxidizing barium sulfite by using oxygen to generate barium sulfate, performing vulcanization and oxidation on the barium source solution on the outer layer of the liquid bead to coat the oil core material in the center to form barium sulfate particles, and finally drying to form the barium sulfate particles with the hollow structure. Hollow barium sulfate is low in density, excellent in structure stability and good in mechanical strength and processability; moreover, the particle diameter and hollow size of hollow barium sulfate can be subjected to micro-adjustment as required; barium sulfate is convenient and practical, and has wide application values.

The invention provides a red sandstone hard slope ecological greening system and a construction method. The system comprises a red sandstone slope. A lower-layer lead wire net and an upper-layer leadwire net are laid on the slope face of the red sandstone slope. A coping beam is arranged on the top of the red sandstone slope so as to anchor the upper-layer lead wire net and the lower-layer lead wire net located on the top. The upper-layer lead wire net and the lower-layer lead wire net are fixed to the red sandstone slope through an anchoring device, and a planting soil layer is arranged between the upper-layer lead wire net and the lower-layer lead wire net. By means of the construction method, construction is convenient, the slope ecological greening system constructed through the method is good in stability and high in erosion resistance, the problem that plants cannot grown on the naked hard slope surface is effectively solved, the probability of happening of the collapse and stone falling phenomenon on the red sandstone slope is also lowered, and meanwhile the greening measure of the hard slope can be more complete.

The invention discloses an automotive storage battery installation device. The device includes a first tray, a second tray and a pressing mechanism 5 used for tightly pressing a storage battery on thefirst tray and the second tray, wherein the first tray and the second tray are used for supporting the storage battery and are arranged opposite to each other. The automotive storage battery installation device can be effectively installed on an automobile body and is great in structural stability, safe and reliable in work performance, simple in structure, less in occupied space and installationprocedures and capable of saving time and labor.

The invention discloses a molten Al—Si alloy corrosion resistant composite coating and a preparation method and application thereof. The composite coating layer comprises an aluminized layer and a TiO₂ thin film layer from the surface of a basal body to the external in sequence. The preparation method of the coating layer comprises the following steps: (S1) the surface of a Fe-based alloy is treated; and then, a solid powder permeating agent is adopted to permeate aluminum; (S2) sand-blasting the aluminized Fe-based alloy; (S3) the Fe-based alloy is washed and dried after sand blasting; and (S4) a TiO₂ thin film layer is deposited on the surface of the dried aluminized Fe-based alloy by adopting an atomic layer vapor deposition method.

The invention discloses a preparation method of three-dimensional nitrogen doped graphene. The preparation method comprises: (1) putting 1g of commercially-available expandable graphite into a crucible, and putting the crucible in a microwave oven for microwave treatment to obtain three-dimensional graphene, wherein in the process of microwave treatment, the power is 600-800W, and the treatment time is 5-15 seconds; (2) mixing 200mg of the three-dimensional graphene with an ammonium salt, wherein the mass ratio of the three-dimensional graphene to the ammonium salt is 2:(0.5-6); and (3) performing heating treatment on the mixture obtained in the step (2) in a N2 atmosphere to obtain three-dimensional nitrogen doped graphene, wherein the heat treatment temperature is 600-900 DEG C, and the heat treatment time is 2-5 hours; the ammonium salt is one of NH4Cl, (NH4)2SO4 and (NH4)3PO3. The preparation method disclosed by the invention is easy to operate, the three-dimensional graphene with a stable structure is obtained by adopting a microwave expansion method, an inorganic salt is used as a nitrogen source, nitrogen doping treatment is performed in the process of heat treatment, and subsequent cleaning and drying processes are not needed; and the obtained product is good in structural stability and high in nitrogen doping amount.

The invention relates to an Fe-P-O/SBA-15 catalyst for preparing bromomethane and CO by methane oxybromination, which is composed of an active component and a support, wherein the active component comprises one or more of FePO4, Fe2P2O7 and alpha-Fe3(P2O7)2; the active component accounts for 1.0-60.0% of the catalyst by weight; the Fe/Si mol ratio in the catalyst is 0.001-1.0; the P/Si mol ratio in the catalyst is 1.0-5.0; the support is an SBA-15 full-silicon molecular sieve; and the specific area of the catalyst is 100-1500m<2>/g, and the pore volume is 0.65-1.20m<3>/g. The preparation method of the catalyst comprises the following steps: by using ferric salt, phosphoric acid [H3PO4] and ethyl orthosilicate [(C2H5O)4Si] as precursors and a triblock polymer [(EO)20(PO)70(EO)20] (P123 for short) as a template, introducing the active component into the support by a hydrothermal method, washing, filtering, drying, roasting and forming to obtain the Fe-P-O/SBA-15 catalyst.

The invention provides a novel ceiling lamp. The novel ceiling lamp comprises a ceiling disc and a lampshade; a groove is formed in the center of the upper surface of the ceiling disc, a fixing hole is formed in the groove, top plates are further arranged on the upper surface of the ceiling disc, a dustproof net is arranged on the side edges of the top plates, and spring sets are arranged below the top plates; a main lamp mounting cavity is formed in the center of the lower surface of the ceiling disc, a communication small hole is formed between the main lamp mounting cavity and the groove, auxiliary lamp mounting holes are formed in the lower surface of the ceiling disc with the main lamp mounting cavity as the round center, decoration lamps are arranged on the outer edges of the auxiliary lamp mounting holes, a boss is arranged on the outer edge of the ceiling disc, and the lampshade is arranged on the boss. The lamp is good in fixing effect, the top plates and the spring sets avoid the damage to the wall and the ceiling disc, the lampshade can be detachably replaced, the service life of the lamp is prolonged, and production cost is reduced.

A kind of supercapacitor pole piece and preparation method thereof, it is characterized in that comprising the following steps: 1, pulping, the active carbon of 60%~90% by weight, the conductive carbon of 5%~35% and the viscose of 5%~10% Put the binder into a planetary vacuum mixer and add a solvent 2 to 5 times the weight of the solid substance for stirring, dispersing and mixing to obtain a uniform supercapacitor slurry; The uniform slurry coated on the organic film carrier is prepared into a carbon film; Ⅲ, drying, step Ⅱ The organic film coated with the carbon film is dried in a tunnel oven, so that the content of the solvent in the carbon film is controlled at 5% to 10 Between %; Ⅳ, hot press forming, place the carbon film dried in step Ⅲ on both sides of the metal current collector, and combine the carbon film and the metal current collector by heating and rolling to form a supercapacitor pole piece.

The invention relates to a transport device for a fabricated wall. The transport device for the fabricated wall comprises corner wrapping structures which are arranged corresponding to the four corners of the fabricated wall and elastic pulling pieces, wherein flexible layers are arranged on the surfaces where the corner wrapping structures are in contact with the fabricated wall; and the elasticpulling pieces are connected with every two adjacent corner wrapping structures in a pulling mode, and the elastic pulling pieces exert pulling force to the every two adjacent corner wrapping structures to enable the every two adjacent corner wrapping structures to close to each other to enable the four corner wrapping structures to be fastened to the fabricated wall. According to the transport device, the corner wrapping structures are used for covering the corners of the fabricated wall, the flexible layers which are arranged on the corner wrapping structures can play a good protective roleand effectively protect the four corners of the fabricated wall, the corners of the fabricated wall are the most easily damaged part in transport, it is guaranteed that the fabricated wall is in goodcondition during transport, and collision damage is avoided. The four corner wrapping structures can be stably, firmly and tightly arranged on the fabricated wall in a sleeved mode by the elastic pulling pieces.

The invention provides an installing structure and installing method for a wall body insulation board. The installing structure comprises an L-shaped adapter part, a T-shaped guide rail, a T-shaped fixing part and an insulation board body; the L-shaped adapter part comprises a horizontal face and a vertical face which are perpendicular to each other, a main body portion of the T-shaped guide railis provided with a clamping groove, and at least one of two wings is provided with a groove; the vertical face of the L-shaped adapter part is fixed to a wall body, and the horizontal face of the L-shaped adapter part is clamped by the groove of the T-shaped guide rail; the wall body is provided with a leveling layer, and the insulation board body is installed on the outer side of the leveling layer; and a main body of the T-shaped fixing part is inserted into the clamping groove of the T-shaped guide rail, and two wings of the T-shaped fixing part are clamped into grooves formed in the edgesof a face layer of the insulation board body. According to the installing structure for the wall body insulation board, an insulation board installing main body framework is formed through combined connection of all the assemblies, the assemblies and the insulation board both can be preformed, machining is not needed on the site, the installing technology of the insulation board is greatly simplified, and meanwhile the quality is guaranteed. Influences of the wall body structure on the installing method are small, and after the insulation board is installed, the flatness is high, and the system safety is high.

The invention relates to a quickly-spliced sunlight room. The upper end of the corner of a rectangular frame is fixedly provided with a beam column assembly A, a beam column assembly B, a beam columnassembly C and a beam column assembly D separately; the left ends of a longitudinal beam column assembly A and a transverse beam column assembly E are fixed to the beam column assembly A, the right end of the transverse beam column assembly E is fixed to the beam column assembly D, the left end of a transverse beam column assembly D is fixed to the beam column assembly B, the right end of the transverse beam column assembly D is fixed to the beam column assembly C, the front end of a side beam assembly A is fixed to the left end of the transverse beam column assembly E, the rear end of the front end of the side beam assembly A is fixed to the left end of the transverse beam column assembly D, the front end of a side beam assembly B is fixed to the right end of the beam column assembly D, the rear end of the side beam assembly B is fixed to the right end of the beam column assembly C, the right side of the side beam assembly A is provided with a plurality of main beams A, the right endsof the main beams A are fixed to the left side wall of a beam ridge assembly, and the right side wall of the beam ridge assembly is fixedly provided with a plurality of main beams B. The quickly-spliced sunlight room has the advantages that the sun room is spliced by special-shaped pieces, splicing is easy, the stability is better, and the splicing efficiency is high.

The invention relates to a starch and expanded graphite phase-change composite material and a method for preparing the same. The starch and expanded graphite phase-change composite material comprisesa middle phase-change material, micro-capsules and granules. The micro-capsules wrap the phase-change material, the granules are connected onto the outer walls of the micro-capsules, the phase-changematerial is paraffin, the micro-capsules are mixtures of modified starch and expanded graphite, the granules include starch granules and expanded graphite granules, and the micro-capsules comprise, byweight, 5%-12% of expanded graphite. Compared with the prior art, the starch and expanded graphite phase-change composite material and the method have the advantages that the starch and expanded graphite phase-change composite material is excellent in heat conductivity and structural stability, and the heat conductivity coefficient of the starch and expanded graphite phase-change composite material can be gradually increased along with increase of the expanded graphite.

The invention discloses a backlight module and a display device, and relates to the technical field of display. The poor display caused by gaps generated between light-emitting surfaces of light sources and an optical component due to bending stress when the backlight module is bent is avoided, and stability and reliability of the backlight module is improved. The backlight module includes a flexible substrate, the optical component and the light sources, wherein the optical component is attached to the flexible substrate, the light sources are fixed to the side, facing away from the optical component, of the flexible substrate, and light of the light sources is emitted from the side on which the light sources are fixedly connected with the flexible substrate.

The invention provides a casing structure between aero-engine turbines. The casing structure comprises an overall force bearing frame and a heat insulation fairing assembly. The overall force bearing frame comprises an outer casing, a double-layer inner casing and an inclined supporting plate, the outer casing is provided with an air entraining heat preservation cavity and a pipeline mounting seat at intervals in the circumferential direction, the double-layer inner casing is provided with an air collection cavity, penetrates through the air collection cavity and is provided with a pipeline bayonet socket, and the inclined supporting plate is connected with the air entraining heat preservation cavity and the air collection cavity. The heat insulation fairing assembly comprises an axial split type rectification guide vane assembly and an integrated rectification guide vane, the integrated rectification guide vane wraps the outer side of the double-layer pipeline, and the axial split type rectification guide vane assembly wraps the outer side of the inclined supporting plate; the inner layer of the double-layer pipeline is used for conveying lubricating oil or an oil-gas mixture, the outer layer of the double-layer pipeline is used for conveying sealing gas, and the double-layer pipeline penetrates through the overall force bearing frame in the radial direction; and the double-layer pipeline is respectively connected with a second external pipeline and a third external pipeline; the second external pipeline is used for circulating sealing bleed air for sealing a bearing cavity with lower temperature; and the third external pipeline is used for circulating lubricating oil or the oil-gas mixture.

The invention belongs to the technical field of agricultural equipment, and provides a steering engagement and disengagement driving mechanism of a combine-harvester. The steering engagement and disengagement driving mechanism comprises an engagement and disengagement steering shaft, a steering main gear assembly, a steering gear assembly, a steering shifting fork assembly and a braking assembly, and a shaft seal assembly is arranged at the outer side end of the braking assembly and used for keeping the rotating position of the engagement and disengagement steering shaft and the fixed position of the braking assembly. The steering engagement and disengagement driving mechanism has the advantages that by means of the steering main gear and steering gear structure of the steering engagement and disengagement driving mechanism, good stability is achieved, the mounting position is precise and reliable, the clearance arrangement is reasonable, and walking and steering of the combine-harvester can be fast and stably achieved; according to the braking assembly, a plurality of alternately combined separation plates and friction plates cooperate, braking stability is good, the running speed of the combine-harvester on a smooth-riding surface is increased, the adaptability of the combine-harvester to complex field blocks is improved, and the cross-regional operation performance of the combine-harvester is greatly improved.

The invention relates to a screen window pulley with the adjustable height. The screen window pulley with the adjustable height comprises a fixing base and a pulley body connected with the fixing base. The fixing base and the pulley body are connected through a height adjusting assembly. The fixing base comprises a transverse fixing plate and a vertical fixing plate, and the transverse fixing plate and the vertical fixing plate are connected perpendicularly. The height adjusting assembly comprises a pulley holder, a lifting plate and a supporting plate. The lifting plate and the pulley holder are fixedly connected, and the lifting plate can move in the vertical direction along the vertical fixing plate. One end of the supporting plate is hinged to the pulley holder, and a hinged shaft is arranged at the other end of the supporting plate. A pair of lug plates is arranged on the transverse fixing plate, positioning holes are formed in the lug plates, and the hinged shaft is matched with the holes in the lug plates. The pulley is connected with the fixing base through the height adjusting assembly, the pulley holder of the pulley body is fixed to the lifting rod, the height of the pulley body is adjusted by adjusting the lifting rod, and meanwhile the pulley holder is connected with the lug plates on the transverse fixing plate through the supporting plate; and the structural stability of the pulley body is good, the service life is long, and the installation difficulty of a screen window is reduced.