Technical fieldThe invention belongs to the metal materials metallurgy and heat treatment technical field, and relates to an interfacial regulating heat treatment method of high entropy alloy particle reinforced aluminum matrix composites, in particular a heat treatment method of regulating (FeCoNiCrAlCu)p/2024A1 composites interfacial.Technical backgroundHigh entropy alloy is a new alloy system with unique microstructure, high hardness and strength, and good thermal stability at high temperature. Due to the natural interfacial bonding property between metal and metal, the interfacial wettability and interfacial compatibility between high entropy alloy and aluminum alloy matrix are goo. If the alloy with high entropy is used as the composite phase to strengthen the aluminum alloy, and the interface characteristics is also adjusted, the strength and plasticity of the composite material can be improved, which has a wide application prospect in automotive, aerospace and other fields.Microwave heating is to absorb microwave by the material inside the metal, and convert it into heat energy. At the same time, the external high dielectric loss SiC crucible heats the material through thermal radiation, so the whole material almost heats up at the same time, the temperature gradient is smaller than other heating methods, and the heating speed is faster, so that the grain is not too big during heat treatment. At the same time, thanks to the electromagnetic force generated by microwave heating, the distribution of the enhanced phase can be more dispersed.The solute concentration difference between the reinforced particles and the matrix of high-entropy alloy reinforced aluminum matrix composites is large, which can promote the mutual diffusion of elements between them. Al is the largest content, and its activity is the highest in solution treatment, which is more conducive to diffusion. The mixing enthalpy of Al and Ni is -22KJ/mol, and the two are easy to combine, while Cu is easy to form segregation. Therefore, at the interface of the composite material, a micron diffusion layer composed of Al, Ni, Cu and other elements is formed.The load between the reinforcement and the matrix is transferred through the interface. However, at present, the measures adopted by researchers to improve strength and toughness are to optimize the types and properties of strengthening particles, and the control of interface characteristics is relatively lack, which can not make the bonding strength and thickness of the composite interface reach the ideal state, often resulting in the high entropy alloy to strengthen the strength and toughness of aluminum matrix composites not being fully developed.In view of this, in order to regulate the interface characteristics of high entropy alloy particle reinforced aluminum matrix composite material, so as to further improve the strength and toughness of the composite material, the present invention proposes a heat treatment method for regulating (FeCoNiCrAlCu)p/2024A1 composite material interface based on the internal relationship between heat treatment system, particle/matrix interface characteristics and mechanical properties.           Compared with the prior technology, the beneficial effects of the invention are as follows:The invention relates to a composite material with an interface layer of certain thickness between the high entropy alloy particle and the matrix. The invention combines two different heat treatment processes of "solid solution" and "aging", uses nano-indentation technology to detect, and promotes the diffusion of the interface of the composite material, which makes the thickness of the interface bonding layer more ideal, and improves the interface bonding strength. At the same time, the aging treatment eliminates the residual stress, reduces the probability of cracking of the material, and realizes the strengthening and toughening of the material.Among the composite materials mentioned in the invention, the high-entropy alloy of strengthening phase and the aluminum matrix have great differences in thermal expansion and other properties. Compared with slow cooling, the residual stress of the room temperature water bath quenching after the first heat treatment is larger. Twin crystals appear in the near interface area of the composite material, and the critical shear stress of the twin crystals is larger, which can hinder the deformation of the crystal so as to strengthen the material.The invention makes full use of the characteristics of microwave heating "low temperature fast burning, selective heating", more effectively promoting the diffusion of interfacial layer elements, and regulating the thickness and bonding strength of interfacial layer, so that the grain will not overgrow during heat treatment. Thanks to the effect of microwave, the microstructure of the material is denser and the strengthening phase is more dispersed. At the same time, microwave heating energy consumption is low, the equipment is simple, and easy to operate and popularize.

Technical fieldThe invention belongs to the technical field of agricultural seeder, in particular to an automatic quantitative seed feeding device for a precision seeder.Background techniqueSowing is an important link in the process of agricultural production. With the rapid development of economy and society, the continuous progress of agricultural science and technology, and the implementation of precision agriculture, higher requirements are put forward for sowing quality. Seeder is the main means to realize mechanization and precision seeding technology, and its performance directly affects the quality of seeding and the growth of crops and yield.Precision planter for seedling cultivation is a kind of air-sucking vibrating disc precision planter, which can overcome many shortcomings of mechanical sowing device. The requirement for seeds’ geometric size is not high, it’s easy to achieve single seed,  and is with high operation speed and low seed damage rate. In the seeding made by air suction vibrating disc precision seeder, the requirement for seed layer thickness of the seed plate is strict. The seed layer thickness must be kept in a suitable range, otherwise, it will not be able to make the seed group under the action of vibration to achieve "boiling" motion state, resulting in bad seeds absorption of some suction cup holes, which leads to seeding holes.However, the existing seed supply device can not realize the accurate control of the seed thickness of the seed plate, and can not make the seed of the seed plate keep the "boiling" motion state at all times, so it can not guarantee the precision sowing requirements of the air suction vibrating disc precision seeder.Invention contentAiming at the deficiency of the existing technology, the invention provides an automatic quantitative seed feeding device for an air-sucking vibrating disc type precision seeder, which can realize automatic quantitative and accurate seed feeding, so that the seed is always in the "boiling" motion state when the thickness of the seed layer in the vibrating seed tray meets the requirement. The seed damage degree is low, one seed supply can make the seeder working time longer; In addition, the seed supply can be set quantitatively according to the actual needs, which provides conditions for realizing the precision sowing of air-sucking vibrating disc seedling in the field.The invention has the advantages of:(1) Automatic quantitative seed supply can be realized, and the seed supply can be set according to the needs of seed suction, improving the automation degree of the seeder.(2) Equipped with a groove of the belt and the first cavernosa seed protection block, the second cavernosa seed protection block. When more seeds are on the belt, the first cavernosa seed protection block can effectively control the thickness of the seeds. The cavernosa material is so soft that seed damage is not high. When breeding in winter, the seeds will become wet due to the temperature difference, which leads to seeds sticking on the conveyor belt. The second cavernosum seed protection block can wipe down the seeds from the conveyor belt, extending the seeder's working time for one time’s seed supply, thus making the sowing efficiency greatly improved.(3) Reasonable structure design, simple structure, easy to control, low processing cost and high planting accuracy.

Technical fieldThe invention relates to the field of tire manufacturing, in particular to a deburring device for the side of TB tire. Background techniqueWith the growth of automobile production, the demand for tires is also increasing. However, based on the limitations of tire production technology, fetal hair will be generated in the tread and side of the tire, which will not only affect the appearance, increase the friction between the tire and the ground, but also produce noise when the car runs at high speed.  If using traditional manual tire trimming machine, many manual operation, high labor intensity, low production efficiency, and unstable and uneven product quality can be seen, and the health of the operator may be badly influenced. Compared with traditional edging machine, automatic tire edging machine has its outstanding advantages, but there are also some problems. At present, there are automatic tire trimming machine products in the market. The trimming tool can carry out linear motion on the tread, so it can be very good for the removal of tire tread burr.But TB tire is with large size, and its side hair removal is more difficult, so the tire side trimming quality can not be guaranteed. The main reasons are as follows: ① The inner ring hair can not be completely removed. The tire hair of the inner ring on the side of the tire is close to the center of the tire and at the inner diameter of the tire side. The cutting tool moves toward the outer diameter of the tire during trimming. If the initial position of the blade is not accurate, the tire hair of the inner diameter of the blade will not be reached, so it can not be removed. ② Burr removal length is not uniform. Analysis of its causes: 1) tire side curve is irregular; 2) The side of the tire is printed with various specifications; that’s uneven; 3) Trimming tool is difficult to fit closely with tread; 4) It is difficult to evenly control the pressure of the tool on the tread. Based on the above objective situation of the side shape of the tire, it is difficult to ensure the uniformity of burr removal by the blade, resulting in substandard trimming quality.A vehicle tire trimming machine is disclosed in Chinese patent 201020566465.0, which is used to trim the raw edge of the tire. The vehicle tire trimming machine comprises a frame host, a two-down trimming unit, a first up trimming unit, a second up trimming unit and a power drive device. In this patent, the trimming blade is connected by a counterweight and a chain to change the angle of the blade to the side of the tire. Different from the above patent, this invention is specialized for trimming the side of the tire, and the trimming tool head is pushed out by the cylinder, so as to ensure the contact force and fit degree between the blade and the tire.A tire shaving machine disclosed in China patent 201320469643.1 includes tread razor, tread floating wheel, tread floating wheel, tread razor and other mechanisms. There is totally one side trimming tool, and the tool head is connected with the cylinder through a connecting rod. The lifting of the side trimming tool is dependent on the cylinder. Different from the above patent, this invention is specialized for trimming side tire, the tool head and the cylinder are directly connected through the nut, and the lifting of the side trimming tool is dependent on the motor lifting device. In this invention, there are four cutting tools, two symmetrical on the left and right, which can greatly shorten the trimming time, improve production efficiency.The invention has the advantages of:In order to ensure that the contact area between the blade and the tire is large enough, it is necessary that the adjacent blade can achieve seamless splicing, so the three independent blades on the three trimming tool mechanism in the tool assembly on one side are connected to the edge, that is, the three small blades are combined into a large blade. The advantages of this design are: 1) all three blades can contact with the tire to ensure that the contact area is large enough; 2) The blade can adapt to the shape of the side curve of the tire to ensure the removal effect of burr; 3) Three knives integrated into one knife can realize the flexible contact between the blade and the tire, ensuring the fit degree between the blade and the tire tread, so as to improve the trimming quality of the tire. Placing two groups of tool assemblies CAN shorten trimming time and improve trimming efficiency; adjusting the angle between the tool and the tread CAN control the length of the tire hair; changing the position of the tool assembly through the movement of the ball screw platform CAN trim different sizes of tires.

01-Project background At the 75th session of the United Nations General Assembly, it was announced that China would strive for carbon peak by 2030 and carbon neutrality by 2060. China's carbon peak and carbon neutral goal is a major strategic decision made by Party Central Committee thoughtfully!Basic assumption:The economy is growing at an average annual rate of 4.1%, and population growth will peak at 1.43 billion in 2030 and decline to 1.36 billion in 2050.Three basic scenarios:1. Reference scenario: The development direction of energy system is clean, low-carbon, safe and efficient, intelligent and diversified, convenient and economical;2. Hydrogen energy social scenario: Hydrogen energy will be ready for large-scale commercial application around 2035 and become a major energy source before 2050;3. Carbon neutral scenario: carbon peak in 2030, carbon neutral target in 2060, non-fossil energy, full commercialization of CCUS technology.According to the International Commission on Hydrogen Energy: In 2050, hydrogen energy will be responsible for 18% of the global energy end demand.02- Fuel cell principles and Hydrogen energy application scenariosHow hydrogen fuel cells workHydrogen fuel cell engine systemFull application scenario: road vehicles, special vehicles, combined heat and power supply, energy storage generation, ships and so on.03- Hydrogen fuel cell special vehicle application scenariosWidely used in sightseeing vehicles and cleaning vehicles in scenic spots, campuses, factories, parks and other closed scenes.04- Research and Development Team At present, there are 3 professors, 2 associate professors, 2 lecturers, 3 industry professors, 7 full-time doctoral students and more than 20 master students.05- Research and Development conditionsBattery material synthesis experimental platformFuel cell test standEnvironment binCharge and discharge machine06- PartnersWork together to tackle key problems in the whole industry chain -- establish a "fuel cell vehicle demonstration and application consortium" to ensure the iterative research and development of a new generation of fuel cell vehicles through the efficient linkage between the upstream and downstream of the industry chain of vehicle enterprises, fuel cell system enterprises, operators, users and hydrogenation stations.07- Results releasedThe first generation of sightseeing carsSecond generation patrol carTechnical parameters and characteristics:To overcome four major technical problems, break through ten key technologies, and establish the R&D capability of fully digital fuel cell electro-electric depth hybrid commercial vehicle power system platform;Comprehensively master the key technologies of integrated development and control of the new generation of special fuel cell vehicles, and fully enter the domestic and foreign markets.08- Research and development results In the past three years, 30 papers have been published, including 26 SCI papers. A total of 35 invention patents were applied, among which 14 were authorized and PCT3 were applied.

Technical fieldThe invention relates to the technical field of transmission in mechanical engineering, and relates to a magnetic induction coupler with non-contact connection, in particular to a adjustable speed magnetic dual-barrel asynchronous magnetic coupler. It can be applied to large vibration between the motor and the load, as a power transmission and speed regulation of the transmission system.Technology backgroundIn the field of mechanical engineering, transmission technology is one of the most basic and important parts, involving all fields of the mechanical industry, widely used in mining, metallurgy, aviation, weapons, hydropower, chemical, textile and transportation sectors.Because the traditional transmission technology adopts rigid connection, friction and wear will occur during operation, which will affect the transmission efficiency of power and cause energy waste. In addition, when installing, it is easy to produce radial and angular deviation, which will produce alternating load and cause vibration. This will reduce the life of the coupler if the problem is light, but it can also affect the normal operation of the equipment if seriously.The magnetic coupler, as a form of new transmission, uses the magnetic force generated by permanent magnet materials to realize the non-contact transmission of torque, reduces the loss of transmission components and prolongs the service life of related components. Based on the above advantages, magnetic couplers have gradually replaced mechanical couplings in some fields to transfer torque and power. However, compared with traditional couplers, magnetic couplers are not strong on load. Therefore, it is an important research direction of expanding the application range if high-power and high-torque output of magnetic couplers can be realized.A three-cylinder permanent magnet governor is disclosed in Chinese patent CN201520148142.2. The invention adopts a three-cylinder structure. The upper and lower ends of the permanent magnet are arranged with copper conductors, which are surrounded by permanent magnets. The magnet works on both sides to generate eddy currents in the copper conductor and realize the transmission of torque. However, the invention adopts unilateral structure and the shape, magnetization and arrangement of permanent magnets adopt traditional methods. In some cases, the carrying capacity may be insufficient.The magnetic coupler of the invention adopts a bilateral structure, and the two adjacent permanent magnets are one pole and the magnetizing directions are perpendicular to each other, so that the magnetic field intensity is greatly improved. The adjacent surfaces of permanent magnets in different magnetizing directions tilt at a certain angle to enhance the self-shielding effect of the coupler, so that the output of high power and large torque can be realized.The Chinese patent CN201210434324.7 discloses a magnetic governor with automatic speed change and its speed regulation method. Through gear drive and thread drive, the matrix of the two driven discs move towards or against each other along the axis, so as to change the thickness of the air gap between the driven disc and the driving disc to achieve speed regulation.However, in the speed regulation process of the invention, the speed regulation device will be affected by the huge axial force between the driven disk and the driving disk, which requires higher output power of the servo motor. At the same time, the servo motor is set on the rotation axis, and the servo motor will rotate accordingly when working, which will have an impact on the actual speed regulation process. In the speed-regulating device of the invention, the influence of the axial force of the magnetic coupler is small and the output torque of the servo motor is low. In addition, because the speed-regulating device of the invention does not rotate with the rotation of the drive shaft and the driven shaft, the servo motor can be fixed and installed. Therefore, the speed-regulating device is more practical and easy to realize.

Responsible person: Zhang Yuan, PhD, Assistant Researcher. The research interests include active free radical polymerization under heterogeneous conditions, synthesis of functional polymers, assembly and application of block copolymer particles. 8 papers have been published in Macromolecules, Polymer Chemistry and other journals, 5 of which have been published as the first author. She participated in "National Science Foundation for Outstanding Young People" and "National Key Projects". He has been awarded "National Scholarship for Doctoral Students", "First-class Scholarship for Academician He Binglin", "Second-class Scholarship for Nankai University", "Outstanding Party Affairs Worker", "First-class Scholarship for Huigu" and "Outstanding Graduate Student of Nankai University".Assembly of block copolymer nanoparticlesEasy to operateLow-toxicHigh concentrationRich morphologyWide universalityAmphiphilic polymer particles are used in biomedicine, controlled drug delivery, stimulation-responsive materials, and template materials, etc.

Technical fieldThe invention relates to the technical field of a precision seeder of agricultural machinery, in particular to a seed layer uniform control seed brush device of an air suction vibration type precision seeder for field seedling cultivation.Background techniqueSeeding is an important technical link in the process of agricultural production, and seeder is the core component to realize mechanization and precision seeding. In recent years, the planting area of super rice has been expanding continuously. Compared with conventional rice, super rice has the advantages of tall plant type, strong stalk, strong corn capacity, large ear and many grains. The sparse planting was beneficial to miliary generation and single plant growth, and the high-yield population structure was formed. The average planting of 5000 ~ 7000 holes per mu was less than that of conventional rice. This puts forward a higher standard for seeding and seedling cultivation technology, requiring the seeding accuracy to be improved from 3 ~ 5 seeds/hole to 1 ~ 2 seeds/hole. Precision seeding has become the main feature of modern seeding technology. The pneumatic suction vibrating disc precision seeder for field seedling cultivation is to make the material form "quasi-fluid" by the vibration of the seed plate, so that the seeds can be separated from each other, and the pneumatic suction parts can complete the precision sowing. In the working process of precision seeder, it is necessary to add seed box continuously. The seed adding box is arranged on both sides of the seed tray, and the seeds are distributed at both ends of the seed box. The thickness of the seed layer is not uniform, which affects the "boiling" movement of the seeds and is not conducive to seed suction. A set of seed layer uniform control device is needed to make the seed layer thickness in the seed tray return to the uniform state after adding seed, so as to facilitate the seed suction movement. When working, the servo motor drives the movable seed brush to move back and forth automatically along the horizontal axis direction of the seed tray, so that the seeds in the seed tray of the precision seeder are evenly distributed. The uniform control device of seed layer is simple, convenient, safe and reliable, and provides conditions for realizing the precision sowing of air-sucking vibrating disk type field seedling cultivation.The invention has the advantages of:(1) The uniform device has the advantages of simple structure, convenient operation, easy control and high control precision.(2) The shear pin safety coupling is applied to the uniform device. When the device fails, it will not be damaged and the reliability of the uniform control device increases.(3) The servo motor can be used to control moving speed of the mobile seed brush, round trip times and other operating parameters, so as to humanize the device and improve the comfort of the operator.

Technical fieldThe invention relates to the technical field of transmission in mechanical engineering, and relates to a magnetic gear of non-contact transmission, in particular to an air gap adjustable magnetic gear using a side sinusoidal magnetic regulating device. It can be used in non-contact transmission system with the characteristics of large vibration, no leakage, large torque and high speed transmission.Background techniqueIn industrial and agricultural production, national defense, aviation, aerospace and other fields, we need transmission mechanism to achieve power transmission, at the same time to achieve speed change. According to the different application occasions, people have developed a variety of conversion devices or equipment to meet the above requirements, such as chain, wire rope, transmission belt, screw rod, crank connecting rod, slider mechanism, CAM ejector mechanism. In these conversion devices, the transmission mechanisms contact each other, which brings friction, vibration, noise and other problems, and reduces the transmission efficiency of the system and the stability of the transmission mechanism.Magnetic gear is a kind of non-contact transmission device, with good reliability, smooth transmission, long life, no friction loss, no lubrication and no oil, etc., and it is gradually used in the field of variable speed drive. The existing internal and external air gap size of concentric magnetic gear is determined to be a fixed value according to finite element analysis and theoretical calculation. However, under the influence of realistic conditions, it is difficult for magnetic gear to achieve the desired transmission efficiency, which requires that the air gap can be changed according to changes in realistic conditions, so that the transmission efficiency of magnetic gear can reach the expected value. In addition, The magnetic regulating device is affected by the electromagnetic force in the changing magnetic field, so the magnetic regulating device needs a large structural strength. The existing magnetic regulating devices all use connecting bridges to improve the structural strength of the magnetic regulating device, but the connecting bridges also increase the eddy current loss and reduce the transmission efficiency of the magnetic gear.Jiangsu University mentioned in invention patent 201010161362.0 a concentric magnetic gear using a squirrel cage magnetic regulating device, and the squirrel cage magnetic regulating device is made of soft magnetic material, which improves the structural strength of the magnetic regulating device, but also increases the eddy current loss caused by the magnetic sensing line cutting of the magnetic regulating device, thus reducing the transmission efficiency of the magnetic gear. In addition, the concentric magnetic gear regulating device is fixed in axial position and cannot adjust the internal and external air gap of the concentric magnetic gear.In the invention patent 200810036390.2 mentioned a magnetic regulating device with magnetic material and non-magnetic material closely arranged along the circumference; the non-magnetic material is epoxy resin, but the magnetic regulating device with epoxy resin as the substrate has low overall impact strength, bad heat resistance, and is not suitable for outdoor use and other shortcomings.In invention patent 201210432030.0, an I-shaped composite magnetic regulating device is mentioned. Its magnetic regulating pole plate is manufactured into I-shaped structure to increase the contact area with non-magnetic materials. However, the I-shaped magnetic regulating device adopts a large angle transition at the structural transition point, which is easy to cause stress concentration under the action of electromagnetic force. Thus, the structure of the magnetic regulating device will be deformed or destroyed.Advantages of the inventionThe magnetic regulating device in the invention is composed of axial superposition of magnetic pole plates, which can reduce eddy current loss of magnetic regulating device. Meanwhile, the side of magnetic pole regulating plate is set into sinusoidal type, so that the magnetic pole regulating plate can improve the structural strength of magnetic regulating device through its own structure and avoid using connecting bridge to increase strength, which can further reduce eddy current loss of magnetic regulating device and improve transmission efficiency of magnetic gear. Linear guide rails improve the moving accuracy and stability of the support frame. At the same time, the left and right movement of the magnetic regulating device changes the size of the external air gap formed between the magnetic regulating device and the external rotor permanent magnet as well as the size of the internal air gap formed between the magnetic regulating device and the internal rotor permanent magnet. The change of the internal and external air gap can change the transmission efficiency of the magnetic gear. Thus, the position with the highest transmission efficiency is determined by the left and right movement of the magnetic regulating device. The limit block can limit the movement distance of the support frame, so as to ensure that the magnetic regulating device does not contact the inner rotor permanent magnet and the outer rotor permanent magnet. Moreover, the limit block can be moved to the ideal position along the linear guide rail by loosening the screw on the limit block.

Responsible person: Song Jianan, PhD, assistant researcher, PhD degree from Shanghai Jiao Tong University. His research interests include surface treatment modification of fillers, preparation and properties of heat-conducting composites, and high performance and functionalization of universal rubber and plastic materials. He has participated in the National Natural Science Foundation project, National Natural Science Youth Foundation, Shanghai Science and Technology Commission nano special project and other science and technology projects. He has participated in more than 10 enterprise horizontal projects as a key member, including ExxonMobil, Japan Cola, Goldilocks Technology, Double Money Tire, etc. He has guided students to participate in the Undergraduate Innovation and Entrepreneurship Training Program, "Challenge Cup" National Undergraduate Extracurricular Academic Science and Technology Works Competition, etc.. He has published 8 papers as the first author in Chemical Engineering Journal, Composites Part A: Applied Science and Manufacturing, International Journal of Heat and Mass Transfer and other TOP journals, and authorized 3 national invention patents.Influencing factors of thermal conductivity compositesThe key technology of thermal conductivity composite materialApplication of heat-conducting compositesThere are many downstream applications of heat dissipation, including consumer electronics, automobiles, base stations, servers and data centers, such as mobile phones, 5G base stations, and new energy vehicle battery packs.Thermal conductivity composite products are numerous 

Principal: Sheng Weichen, Doctor, Associate professor, graduated from the Institute of Polymer and Polymerization Engineering of Zhejiang University, and now works in the Institute of Polymer Materials & School of Materials and Engineering of Jiangsu University. His current research interests include functional polymer microspheres (nano/micron) design and polymerization regulation, photoelectrical/thermal polymer composites preparation and application. He has participated in the National Natural Science Foundation, Science Foundation of Jiangsu Provincial Education Department, key Laboratory Fund, provincial & municipal policy guidance program and many horizontal product development projects. He has published dozens of papers in Polymer, Polymer Chemistry, Journal of Applied Polymer Science, High Performance Polymers, Journal of Functional Materials, Polymer Journal, Polymer Materials and Engineering, Polymer Bulletin, Chemical Journal, Chemical Journal, Fine Chemical Industry, modern chemical industry, New chemical materials, Functional materials, ion exchange and adsorption and other journals. He has written a number of national invention patents, and has authorized four.Spy satellites can now see objects 10 to 15 centimeters above the ground, and even license plate numbers of moving cars at night. The survivability of military installations in wartime is threatened and camouflage technology is paid more and more attention.The chameleon paint in the future will not only fool the eyes of satellites and scouts in the sky, but also cheat infrared and ultraviolet rays and radar reconnaissance, so as to achieve an integrated effect with the environment.