2218results about How to "Improve compactness" patented technology

The invention relates to the technical field of building materials, and particularly discloses high-strength lightweight concrete containing hollow glass beads and a preparation method of the high-strength lightweight concrete. The high-strength lightweight concrete containing the hollow glass beads is prepared from cement, fly ash, carbon fiber grafted hollow glass beads, lightweight sand, deionized water, polypropylene fiber grafted rubber particles and a water reducing agent according to the mass ratio of (58-75): (25-38): (45-65): (20-40): (42-55): (35-55): (5-12) through mixing, mold filling, vibration molding, covering and demolding. The addition amount of the hollow glass beads is strictly controlled, the influence on the overall strength of the concrete is avoided, the density and weight of the concrete are reduced due to the addition of the light sand and the hollow glass beads, the compactness and integrity of the concrete are improved due to the synergistic effect of the two added fibers, and the raw materials have excellent cohesiveness; the concrete can effectively absorb and disperse stress, and has the advantages of excellent strength, light weight, good durability and excellent comprehensive performance.

The invention discloses a microencapsulation repairing agent and an intelligent self-repairing ultrahigh-strength ultrahigh-toughness cement-based structural material, the microencapsulation repairing agent is mainly composed of a humidity-responsive outer layer, a pH-responsive middle layer and a temperature-responsive inner layer, and the outer layer is modified with a silane coupling agent. The intelligent self-repairing ultrahigh-strength ultrahigh-toughness cement-based structural material is mainly prepared from the microencapsulated repairing agent, nano carbon black, nano montmorillonite, nano cellulose and other raw materials. According to the invention, by introducing the self-repairing microcapsule with a specific structure and materials such as nano carbon black, nano montmorillonite and nano cellulose, the strength, toughness and durability of the concrete are remarkably improved, and the concrete has an intelligent self-repairing function.

The invention relates to the field of solidified soil, and particularly discloses solid-waste-based premixed flow-state solidified soil and a preparation method thereof. The solid-waste-based premixed flow-state solidified soil comprises soil, water and a curing agent according to the weight ratio of (28-36): (50-54): (6-9), according to the total weight of the curing agent, the curing agent comprises the following components in parts by weight: 20-40 parts of fly ash, 30-47 parts of slag, 6-18 parts of silica fume, 10-15 parts of sea sludge, 1-3 parts of a water reducing agent, 1-3 parts of sodium hydroxide, 1-3 parts of calcium sulphoaluminate, 3-10 parts of a fiber reinforced material and 1-3 parts of phosphate. The problems that stress generated by the solidified soil in the hydration process is excessively concentrated and shrinkage is excessive can be solved, and therefore cracking of the solidified soil subjected to premixed flow state solidification is reduced.

The invention discloses a preparation method of a solar cell, and the method comprises the following steps: placing an N-type silicon wafer in a furnace tube of a diffusion furnace, and introducing nitrogen and oxygen into the furnace tube to form a first oxide layer on the surface of the silicon wafer; boron trichloride, oxygen and nitrogen are introduced into the furnace tube, so that a boron diffusion layer is formed on the surface, away from the silicon wafer, of the first oxide layer; introducing nitrogen into the furnace tube, and controlling the temperature of the furnace tube to be a first temperature so as to carry out oxygen-free propulsion of the boron element; introducing nitrogen and oxygen into the furnace tube, and controlling the temperature of the furnace tube to rise from the first temperature to a second temperature so as to carry out aerobic propulsion of the boron element; dry oxygen and wet oxygen are alternately introduced into the furnace tube for multiple times to form a second oxide layer; the temperature in the furnace tube is reduced, and dry oxygen continues to be introduced into the furnace tube; and nitrogen is introduced into the furnace tube, the temperature in the furnace tube is reduced, and boron diffusion of the silicon wafer is completed. According to the preparation method of the solar cell, the silicon wafer can have low surface concentration shallow junctions and uniform sheet resistance.

The invention provides an ultrahigh-ductility cement-based composite material for ocean engineering and a preparation method of the ultrahigh-ductility cement-based composite material for ocean engineering. The concrete is prepared from the following raw materials in parts by weight: 250 to 500 parts of cement clinker, 400 to 600 parts of fly ash, 200 to 300 parts of mineral powder, 100 to 150 parts of silica fume, 160 to 240 parts of metakaolin, 600 to 900 parts of quartz sand, 10 to 20 parts of organic synthetic fiber, 20 to 30 parts of organic corrosion inhibitor, 180 to 240 parts of water and 1 to 8 parts of water reducing agent. The organic corrosion inhibitor provided by the invention can be combined with chloride ions to form a passive film, so that the corrosion of reinforcing steel bars and the invasion of the chloride ions into concrete are inhibited, and the durability of the concrete is improved; by regulating and controlling the mixing ratio of the four mineral admixtures and the mixing amount of the synthetic fiber component, the concrete can well consider high strength, high ductility, high durability, high flow state and excellent deformation resistance. The ultrahigh-ductility concrete for ocean engineering, which can meet the toughness requirements of high compression resistance, fracture resistance and impact resistance and the requirements of high chloride ion permeation resistance and steel bar corrosion resistance, can be obtained.

The invention relates to the technical field of powder metallurgy, in particular to a tungsten-copper alloy preparation method and a tungsten-copper alloy. The preparation method of the tungsten-copper alloy comprises the following steps: mixing double-scale compound tungsten powder containing nanocrystals and ultra-fine grains or double-scale compound tungsten-tungsten oxide powder containing nanocrystals and ultra-fine grains with copper oxide powder to obtain precursor slurry; drying the precursor slurry to obtain precursor composite powder; the precursor composite powder is subjected to segmented reduction, tungsten-copper composite powder is obtained, and tungsten crystal grains in the tungsten-copper composite powder are distributed in a double-scale mode of nanocrystals and ultra-fine crystals; and the tungsten-copper composite powder is prepared into a blank and sintered, and the tungsten-copper alloy is obtained. The heat conductivity and density of the tungsten-copper alloy can be improved.

The invention provides a composite exciting agent and application thereof, and relates to the technical field of exciting agents, and the composite exciting agent comprises an alkaline exciting agent, a calcium source exciting agent and an auxiliary exciting component. Industrial solid waste materials such as the slag, the fly ash and the steel slag can work cooperatively in the same system, the gelling performance, the mechanical strength and the durability of the material are remarkably improved, and the purposes of solid waste resource utilization and low-carbon environmental protection are achieved.

The invention relates to the field of metal surface treatment, and discloses a multi-layer vacuum coating method for enhancing the surface of a high-precision metal part, which comprises the following steps: S1, surface treatment: removing surface pollutants and oxide layers through plasma cleaning, and coarsening the surface of a base material through laser etching; s2, coating deposition is conducted, specifically, a metal transition layer and a multi-layer nano hard coating are deposited in an enhanced mode through plasma; s3, depositing a self-lubricating coating: depositing the self-lubricating coating by pulse laser; s4, post-treatment: carrying out ion beam assisted post-treatment; s5, heat treatment: performing low-temperature heat treatment to eliminate stress. Through the plasma enhanced PVD and pulse laser deposition technology, the multi-layer nano coating is deposited under the low-temperature condition, the problem of thermal deformation of a heat-sensitive metal base material caused by a traditional high-temperature process is solved, and it is ensured that the multi-layer coating with high hardness and high compactness can still be formed on the premise that the size precision of the base material is not affected; and therefore, the method can be widely applied to surface treatment of high-precision parts.

The invention discloses a super-wear-resistant super-hydrophobic coating in the technical field of coatings, the super-wear-resistant super-hydrophobic coating comprises a primer and a finishing coat, the primer comprises solvent-free aliphatic polyether polyol resin, micro-powder particles, di-tetratoluene diisocynate, fumed silica nanoparticles and a primer magnetic attraction material; the finishing paint comprises hydrophobic nanoparticles, a diluent, a finishing paint magnetic attraction material and a hydrophobic treatment agent, the primer magnetic attraction material is ferrite powder, and the finishing paint magnetic attraction material is nickel powder. The preparation method comprises the following steps: 1, preparing the primer; secondly, primer is sprayed; step 3, roughening the primer; 4, finish paint is manufactured; step 5, spraying finish paint; and step 6, detecting the performance of the coating. The preparation method is scientific and reasonable, the uniformity and stability of the coating in the preparation and coating process are ensured by optimizing the composition of the coating material, improving the preparation process and introducing a magnetic suction device, and therefore the wear resistance, hydrophobicity and adhesive force of the coating are improved.

The invention provides magnesium phosphate cement-based concrete. The magnesium phosphate cement-based concrete is prepared from the following raw materials in parts by weight: 10-20 parts of phosphate, 30-50 parts of active magnesium oxide, 0.5-3 parts of a retarder, 5-15 parts of a mineral admixture, 0.5-4 parts of a functional additive, 20-30 parts of fine aggregate, 2-5 parts of reinforced fibers and 10-28 parts of water. The invention also provides a preparation method of the magnesium phosphate cement-based concrete. The magnesium phosphate cement-based concrete provided by the invention has a multi-layer anti-corrosion barrier, a compact microstructure, an intelligent ion barrier and good environmental adaptability, and can meet the use requirements in complex and severe environments.

The invention belongs to the technical field of materials, and particularly relates to a modified TB polymer, a preparation method and application of the modified TB polymer in an aluminum alloy surface coating. The prepared modified TB polymer has a structure as shown in a formula I, is used as a flexibilizer component in an aluminum alloy surface coating, can provide a large number of hydrophilic hydroxyl or carboxyl groups which are easily subjected to an activation reaction with a metal surface, and improves the adhesive force of the coating; meanwhile, the group can also improve the dispersity of the filler, so that the coating is more uniform, the stress effect of the coating can be improved, and the coating has better flexibility. In addition, a modified TB polymer is introduced into the coating, so that the prepared coating is green and environment-friendly, excellent in salt fog resistance and chemical corrosion resistance, capable of adapting to a complex marine environment, capable of well protecting metal materials and capable of prolonging the service life of the metal materials. And # imgabs0 # I is adopted.

The invention relates to the technical field of cement-based composite cementing material preparation, in particular to a low-carbon environment-friendly cement-based composite cementing material and a preparation method thereof.The preparation method comprises the steps that an initial forming object is subjected to regional division according to position characteristics so as to obtain real-time monitoring results of all target monitoring regions, determining the actual state of each target monitoring area according to the real-time monitoring result; analyzing the actual state to determine a single mixing amount set of each target monitoring area; integrating the single mixing amount sets to obtain a target mixing amount set, and sequentially performing stirring and pouring molding according to the target mixing amount set to obtain a target molded object; in the stirring process, the initial stirring parameters are adjusted according to the actual stirring degree in combination with the overall analysis result, so that actual stirring parameters are determined; and in the pouring forming process, the initial pouring parameters are adjusted according to the bubble generation rate in combination with the overall analysis result, so that the actual pouring parameters are determined.

A method for improving the density of a copper alloy part comprises the following steps that forming is conducted, specifically, dry copper alloy powder is selected and laid layer by layer through a binder spraying 3D printing technology, and a binder is selectively sprayed through a slice pattern of the part till a 3D printing model is completed; curing is conducted, specifically, the printed 3D printing model is subjected to thermocuring, and after thermocuring, powder cleaning is conducted to obtain a copper alloy green body; degreasing: degreasing the copper alloy green body in a vacuum degreasing furnace to obtain a degreased green body; and sintering is conducted, specifically, the degreased blank is subjected to sectional type sintering and then cooled to the room temperature along with a furnace, and the copper alloy part is obtained. After the copper alloy powder is subjected to jet printing forming through a binding agent, under the vacuum thermocuring process, a printed model has certain strength, and oxidation cannot be generated; the binder is effectively removed through vacuum degreasing, the quality and performance of the subsequent sintering process are guaranteed, and the compactness of the part is remarkably improved through segmented sintering and furnace cooling.

The invention relates to the technical field of concrete preparation, in particular to moisturizing anti-cracking high-ductility concrete and a preparation method thereof. The moisturizing anti-cracking high-ductility concrete is prepared from the following components: 350 to 450 parts of ordinary Portland cement, 200 to 300 parts of fly ash, 30 to 50 parts of silica fume, 250 to 350 parts of quartz sand, 0.5 to 1 part of a water reducing agent, 10 to 20 parts of an expanding agent, 0.1 to 0.3 part of a retarder, 0.5 to 1 part of a thixotropic lubricant, 0.2 to 0.7 part of a modified nano material, 0.7 to 3 parts of a modified composite curing agent, 5 to 10 parts of an anti-cracking agent, 5 to 12 parts of polymer fiber and 180 to 220 parts of water. The high-moisture-retention high-water-retention concrete has the characteristics of high moisture retention and high water retention, is beneficial to maintaining the internal humidity balance, reducing cracks generated by drying shrinkage, improving the durability of the concrete, and remarkably reducing the cracking risk of the concrete in the hardening process, so that the concrete structure is more complete, the safety of the structure is improved, and the service life of the structure is prolonged.

The invention discloses a rapid development method and system for a high-performance nodular cast iron material based on electronic metallurgy, and relates to the technical field of electronic metallurgy, and the rapid development method comprises the steps that a high-performance nodular cast iron raw material is smelted through multi-stage electron beams, and uniform molten metal is obtained; monitoring the chemical components and temperature change of the molten metal in real time, and dynamically adjusting the addition of the spheroidizing agent; the pouring speed and pressure of the molten metal subjected to spheroidizing treatment are intelligently controlled, and casting pouring is conducted; the internal stress change of the casting is monitored in real time through an embedded stress sensor, and the casting cooling process is adjusted; the cooled casting is subjected to surface treatment, heat treatment and machining; component detection and performance testing are conducted on the casting obtained after treatment and machining are completed; through the multi-stage electron beam melting technology, accurate control over the temperature and chemical components of the molten metal is achieved, and the uniformity and stability of the molten metal are ensured.

The utility model discloses a relay which comprises an insulating cover, a pair of static contacts, a movable assembly and an anti-rotation structure. The pair of static contacts is connected to the insulating cover; the movable assembly comprises a push rod component and a movable contact assembly, and the push rod component is used for driving the movable contact assembly to move so as to be in contact with or separated from the pair of static contacts; the anti-rotation structure is used for limiting rotation of the push rod component around the axis of the push rod component and limiting rotation of the movable contact assembly around the axis of the push rod component.

The invention belongs to the technical field of welding, and discloses a dissimilar metal power modulation galvanometer laser welding method which comprises the following steps: finely cleaning a 6061 aluminum alloy and a 304 stainless steel plate by using acetone, and then airing for more than 20 minutes; the aluminum steel sheet is assembled, pressed and fixed on a welding test platform in a steel-up-aluminum-down mode; the position of the welding test platform is adjusted, argon serves as welding protection gas, and a protection gas nozzle is arranged to be aligned with a welding pool area; laser welding parameters are set, a laser power modulation mode is set to be a gradient power mode, and the gradient power mode is to regulate and control phase point laser power in a circular scanning track in the advancing direction of a welding seam; a welding test is carried out in the mode that a galvanometer laser head is fixed and a welding test platform is moved, and a laser and the welding test platform are synchronously started and stopped; and the protective gas is started 5 seconds before the laser is started, and after the laser is stopped, the protective gas is stopped lagging for 10 seconds so as to continuously protect the welding seam and prevent oxidation.

The invention provides a nano modified composite cementing material, which relates to the technical field of cementing materials, and comprises the following components: slag, construction waste powder, a nano material, an alkali activator and water. By introducing the nano material, the pore structure of the solid waste-based material is remarkably improved, and the gelling capacity, mechanical property and durability of the solid waste-based material are improved. Meanwhile, the material also has relatively strong crack resistance, and the photocatalytic performance and the self-cleaning function of the material can be improved by introducing a functional nano material.

The invention discloses a rare earth oxide modified high-entropy hard alloy and a preparation method thereof. A high-entropy hard phase (high-temperature calcination), a high-entropy binding phase and rare earth oxide are adopted, grinding, pressing and air pressure sintering at the temperature of 1450-1550 DEG C are conducted, and the high-entropy hard phase is prepared from tungsten carbide, titanium carbide, zirconium carbide, yttrium carbide, manganese carbide, chromium carbide and molybdenum carbide; the high-entropy binding phase comprises the following components: cobalt and a CoCrFeNi-series high-entropy alloy; and the component of the rare earth oxide is Y2O3 or Nd2O3. The prepared rare earth oxide modified high-entropy hard alloy has the advantages of high strength, high compactness, high hardness, high wear resistance and the like.

The invention relates to the technical field of wastewater treatment, in particular to a method for cooperatively treating petrochemical wastewater based on porous carbon and micro-nano bubbles, which comprises the following steps: S1, pretreating the petrochemical wastewater; s2, carrying out micro-nano aeration on the pretreated petrochemical wastewater by adopting a micro-nano bubble generation device to obtain aerated wastewater; s3, the aerated wastewater is subjected to adsorption treatment through modified porous carbon, purified wastewater is obtained, and the modified porous carbon is biomass porous carbon loaded with rose red ammonium tricarboxylate. According to the invention, through a cooperative treatment process of pretreatment, micro-nano bubble oxidation and modified porous carbon adsorption, efficient removal of multiple types of pollutants (including refractory organic matters, heavy metals and suspended particulate matters) is realized, the wastewater treatment efficiency is improved, and the operation cost is reduced.

The aluminum profile sheet weld joint welding device comprises a welding mechanism, the welding mechanism comprises a welding equipment body, the bottom end of the welding equipment body communicates with a material injection hopper, the bottom end of the material injection hopper communicates with a welding main pipe, and the welding main pipe is electrically connected with the welding equipment body through an external power source; a protection mechanism is arranged at the bottom end of the welding main pipe, the protection mechanism comprises a pressing plate installed at the bottom end of the welding main pipe, a filtering assembly is arranged in the pressing plate, and the filtering assembly comprises a box body installed in the pressing plate. Welding defects caused by water or impurities are effectively prevented, gas in a welding area can be effectively exhausted, air holes generated in the welding seam repairing process are reduced, the compactness and strength of a welding seam are improved, and the reliability and durability of a welding joint are ensured.

The invention relates to the technical field of laser processing, in particular to multi-axis ultrafast laser and ultrasonic combined processing equipment. The five-axis linkage machining equipment is used for simultaneously or independently moving in five different axial directions of an X axis, a Y axis, a Z axis, an A axis and a B axis, and a workpiece to be machined is clamped on the workbench; the laser generator is mounted on a cross beam of the five-axis linkage processing equipment; the ultrasonic vibration main shaft is mounted on a Z-axis mounting seat in the five-axis linkage machining equipment; the four-axis small motion platform is mounted on a Z-axis mounting seat in the five-axis linkage machining equipment and is used for accurately adjusting the spatial position of the galvanometer and the rotating angle of a laser beam, so that the four-axis small motion platform and the ultrasonic vibration main shaft cutter form combined machining with different laser incident angles; the three-dimensional scanner is used for obtaining the six-degree-of-freedom point cloud model of the workpiece to be machined. A three-dimensional scanner, a galvanometer and an ultrasonic vibration main shaft are integrated in five-axis linkage machining equipment, so that the equipment compactness and the operation convenience are improved; therefore, the ultra-fast laser is suitable for hard light path transmission.

The invention discloses 3D printing low-carbon concrete containing modified recycled aggregate and a micro-powder reinforcer. The 3D printing low-carbon concrete is prepared by the following steps: (1) putting recycled concrete coarse aggregate into sodium or potash water glass, and performing ultrasonic treatment; then separating the coarse aggregate, performing carbonization treatment, and heating the obtained coarse aggregate to obtain the pretreated recycled aggregate. And (2) placing the pretreated recycled aggregate in saturated lime water, and carrying out heating and heat preservation treatment to obtain the modified recycled aggregate. And (3) forming a wet material from the waste cement slurry powder, gamma-C2S powder and water, performing carbonization treatment on the wet material, performing heating treatment, and grinding the obtained solid to obtain the modified regenerated micro-powder enhancer. And (4) uniformly mixing the cement, the modified recycled aggregate, the fine aggregate, the micro-powder enhancer, the water reducing agent and the water to obtain the concrete. The process provided by the invention not only improves the mechanical strength and fluidity of the 3D printing concrete prepared from the recycled concrete aggregate, but also consumes carbon dioxide and reduces carbon emission.

The invention relates to the technical field of reverse osmosis membranes, in particular to a polyamide reverse osmosis membrane for high-salinity wastewater treatment and a preparation method of the polyamide reverse osmosis membrane. The invention solves the problem that the polyamide reverse osmosis membrane cannot give consideration to both desalination rate and water flux. The polyamide reverse osmosis membrane comprises a polyester non-woven fabric layer, a polysulfone porous layer, a transition layer and a polyamide layer. The polysulfone porous layer is prepared, and the modified pore-forming agent is added to improve the water flux of the reverse osmosis membrane; the hydrophilicity of the reverse osmosis membrane is improved by preparing the transition layer and adding a hydrophilic auxiliary agent when the polyamide layer is prepared; the flux attenuation rate of the polyamide reverse osmosis membrane is reduced by preparing the polyamide layer; the desalination rate of the reverse osmosis membrane is improved by introducing a composite ion complexing agent and graphene quantum dots into the polyamide layer.

The invention relates to the technical field of wafer cleaning devices, and discloses a megasonic semiconductor wafer cleaning device which comprises a megasonic machine, a cleaning box and a semiconductor wafer, the cleaning box is arranged on the outer side of the megasonic machine, and the semiconductor wafer is arranged above the cleaning box. A rotating assembly and a shaking assembly which are used for assisting in cleaning semiconductor wafers are arranged above the cleaning box, a fixing assembly which is used for fixing the semiconductor wafers of different sizes is arranged above the cleaning box, and through the arrangement of the rotating assembly and the shaking assembly, the surfaces of the wafers can be covered more comprehensively in a composite motion mode, so that the cleaning efficiency is improved. The transmission of the worm gear rod and the worm has a self-locking characteristic, so that reverse rotation and shaking in the movement process can be effectively prevented, the rotation stability is ensured, wafer damage or non-uniform cleaning caused by unstable movement when a traditional device meets complex movement requirements is avoided, mutual interference generated among different driving mechanisms is reduced, and the service life of the device is prolonged. And the reliability and the compactness of the device are improved.

The invention discloses a biomedical magnesium alloy and a preparation method thereof, and belongs to the technical field of magnesium alloy materials. The biomedical magnesium alloy comprises a magnesium alloy matrix, a micro-arc oxidation film layer is arranged on the surface of the magnesium alloy matrix, and a PLGA-HA composite coating is arranged on the surface of the micro-arc oxidation film layer. The micro-arc oxidation film serves as a magnesium alloy surface modification base layer, provides a good adhesion interface for the composite coating and enhances the corrosion resistance of a base body. By introducing the PLGA-HA composite coating on the micro-arc oxidation film on the surface of the magnesium alloy, the PLGA coats and stabilizes HA particles, so that the HA particles are distributed more uniformly, meanwhile, the bonding strength of the HA and the micro-arc oxidation film is improved, the stripping phenomenon of the coating is reduced, and the long-term stability of the coating is ensured. In addition, the composite coating further fills up pores and cracks of the micro-arc oxidation film, and the overall compactness and corrosion resistance are remarkably improved, so that the degradation rate of the magnesium alloy is effectively delayed.

The utility model relates to the technical field of health preserving kettles, in particular to a detection module with a compact structure and a health preserving kettle.The detection module comprises an installation cover, a temperature sensing assembly and a water level detection device are installed on the installation cover, and the temperature sensing assembly comprises a heat conduction top cover and a temperature sensor; the heat-conducting top cover is mounted on the front side of the mounting cover; the water level detection device is mounted on the rear side of the mounting cover; the heat-conducting top cover is mounted in front of the water level detection device; the projection of the heat-conducting top cover in the front-back direction is overlapped with the water level detection device; the health pot comprises a pot body, a base and the detection module. The heat conduction top cover is installed in front of the water level detection device, the projection of the heat conduction top cover in the front-back direction is overlapped with the water level detection device, then the temperature sensing assembly and the water level detection device are overlapped together, the overall size of the detection module is reduced, and the structural compactness of the detection module is improved.

The invention provides an axially compact joint module and a joint structure. The axially compact joint module comprises a harmonic assembly, wherein the harmonic assembly comprises a crossed roller bearing outer ring which is fixedly connected with a steel wheel, a crossed roller bearing inner ring which is fixedly connected with a hollow shaft, a flexible gear is meshed with the steel wheel, and the flexible gear is connected with a wave generator through a bearing; the motor assembly comprises a motor stator and a motor rotor which are coupled, a motor shaft is fixedly connected with the motor rotor, the meshing part of the flexible gear and the steel wheel extends into the motor shaft, and a small bearing is arranged between the inner circle of the motor shaft and the hollow shaft; the brake assembly comprises a brake rotating shaft and a brake cover plate, the brake rotating shaft is fixedly connected with the motor shaft, the brake cover plate is fixedly connected with the shell, and the outer circle of the motor shaft is connected with the shell through a large bearing and the brake cover plate in a matched mode. The meshing part of the flexible wheel and the steel wheel extends into the motor shaft and is overlapped in the axial size, the total length of the joint can be reduced by axially overlapping the small bearing and the large bearing, and the axial compactness of the joint module is improved.

The invention relates to the technical field of information retrieval, in particular to an interdisciplinary knowledge graph construction system and method, and the system comprises a relation matrix construction module which analyzes a node relation based on nodes in a knowledge graph, carries out the statistics according to an association frequency, selects interdisciplinary nodes to construct an association matrix, calculates a node fitting degree, and determines an association node set; and generating an interdisciplinary incidence relation matrix. According to the method, through correlation frequency statistics and fitting degree calculation of interdisciplinary nodes, effective construction of comprehensive correlation between the nodes, decomposition of the feature matrix and elimination of non-key feature items, the sparsity of the matrix is improved, data are more concise and clear, and through screening of low-weight elements, reservation of important node relation and further optimization of matrix feature expression, the method has the advantages of being high in robustness and high in reliability. In the coupling analysis and partitioning process of the nodes, redundant connection of the low-coupling-degree nodes is reduced, the core relation is highlighted, the node structure is recombined, and the accuracy and compactness of the multidisciplinary knowledge graph are remarkably improved.

The invention provides a high-dynamic five-axis laser processing device based on double optical wedges, which can effectively improve the performance of five-axis laser processing equipment, and comprises a laser generator, a light field regulation and control module, a double-optical-wedge light beam offset module, a focusing and beam expanding module, a spectroscope, an observation system, a scanning module, a focusing module, a motion platform, a control system and operation software. The laser generator generates a laser beam, and the laser beam enters the double-optical-wedge light beam offset module after being regulated and controlled by the light field regulation and control module. The double-optical-wedge light beam deviation module deviates a laser beam from an optical axis, and the laser beam is parallel to the optical axis and enters the focusing and beam expanding module; the focusing and beam expanding module amplifies the off-axis amount of the laser beam and changes the divergence angle and diameter of the laser beam; then the laser beam enters the scanning module through the spectroscope; the laser beam is not parallel to the optical axis after passing through the scanning module, and finally the laser beam is transmitted to the machining surface on the motion platform after being focused through the focusing module.