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31results about How to "Small rotational inertia" patented technology

Wind farm reactive-power control strategy for promoting transient stability of weak power grid integrated with wind power

The invention discloses a wind farm reactive-power control strategy for promoting the transient stability of a large-scale weak power grid integrated with wind power. The strategy is divided into twoaspects of turbines and a wind farm, wherein in the turbine aspect, reactive-power priority control is adopted; in the wind farm aspect, based on a transient energy method, a transient unbalanced energy prediction value is calculated, a transient voltage stability margin is calculated, reactive power output of the different direct-drive wind turbines is adjusted, and a reactive power adjusting instruction is transmitted to each turbine. A strategy overall used by a controller is that according to interaction of the wind farm and an electric system in a system, reactive power control to the wind farm is decomposed into additional control to each draught fan. The control strategy needs no any additional hardware, the communication ability of a centralized control system of the wind farm andthe control strategy of direct drive wind turbines themselves are made full use of, the unreasonable fluctuation of overall reactive power voltage of the wind farm is avoided, and the transient stability performance of the weak power grid integrated with the wind farm can be effectively improved.
Owner:WIND POWER TECH CENT OF GANSU ELECTRIC POWER +2

Preparation method of woven carpet without gumming process

ActiveCN108411460AEnhanced shape retention and dimensional stabilityOmit the adhesive processHeating/cooling textile fabricsWoven fabricsCopolyesterWeft yarn
The invention discloses a preparation method of a woven carpet without a gumming process. A second coating layer is a hot-melt fiber-formed filament or a staple fibre yarn, a first coating layer is apolyester fiber filament or a staple fibre yarn, the second coating layer accounts for 20%-50% of the total mass of a composite yarn, the first coating layer accounts for 10%-15% of the total mass ofthe composite yarn, the balance is a core yarn, and a pile weft yarn is obtained by adopting the manner. When the non-adhesive carpet is produced by using a hot-melt copolyester fiber as a bonding material in combination with the pile yarn made of a polyester fiber, the melting occurs when the hot-melt copolyester fiber is heated to be higher than the melting point in a hot pressing process, the conformation of a fiber macromolecular chain is changed, the whole macromolecular chain slips through the transition of chain segments, viscous flow occurs, the pile and weft yarns as well as the weftyarns and warp yarns are effectively solidified after curing, and the pull strength of the pile and the shape retention and dimensional stability of the carpet are enhanced, so that the gumming process in the carpet preparation process is omitted, and the produced carpet is more environmentally friendly.
Owner:QINGDAO UNIV

Screen printing machine

The invention discloses a screen printing machine. The screen printing machine comprises a bottom plate. The bottom plate is sequentially provided with an inlet slice conveying mechanism, a rotating platform group and an outlet slice conveying mechanism. The rotating platform group comprises a rotating frame and a rotation drive mechanism driving the rotating frame to do rotating movement. A plurality of silicon wafer placement conveying platforms are arranged on the rotating platform in the circumferential direction. An inlet slice detection positioning mechanism, a screen printing device andan outlet slice detection mechanism are arranged on the circumferential side of the rotating frame, the silicon wafer placement conveying platforms sequentially move to the positions below the detection positioning mechanism, the screen printing device and the outlet slice detection mechanism in the rotating process. The rotating platform assembly design is simplified, the rotating platform and the silicon wafer placement conveying platforms are integrally designed, the assembly installation space is reduced, the total weight is reduced, the assembly weight is drawn close to the center of therotating platform so that the rotation inertia can be reduced, the printing precision is improved, the silicon wafer placement conveying platforms carry out conveying in a non-contact manner, the conveying power is stable, and the precision is good.
Owner:LIANCHENG KEKESI TECH CO LTD

Automatic rotation type coke cutter

The invention provides an automatic rotation type coke cutter, belongs to the technical field of hydraulic decoking, and mainly solves the problem that two working conditions including drilling and coke cutting cannot reach an optimal matching state since an existing coke cutter only can provide one pre-set rotary speed. The automatic rotation type coke cutter is mainly characterized by comprising a drilling rod connection part, a water power part, a throttle governing part, a decoking part and a switching part, wherein the throttle governing part is arranged between the water power part and the decoking part; the switching part is arranged in an axial cavity of the decoking part; the upper rend of a switching shaft is connected with a switching disc by a spline; the switching disc is provided with two switching blocks; a water supply flow channel of the decoking part is an inner annular flow channel; four or two coke cutting nozzles are distributed at the periphery of the water supply flow channel and four drilling nozzles are distributed at the bottom end of the water supply flow channel. The automatic rotation type coke cutter has the characteristics of providing rotation speeds meeting the two working conditions including the drilling and the coke cutting respectively and being good for removal of buried drilling when coke in a tower collapses and is power equipment capable of being widely applied to a hydraulic decoking process in the coke tower.
Owner:XIANGYANG HANGSHENG PETRO CHEM ENVIRONMENTAL PROTECTION EQUIP

Backing roll fiber-braided composite layer

The invention discloses a backing roll fiber-braided composite layer and belongs to a backing roll. The composite layer comprises a fiber-braided structure reinforcement layer and a pouring layer; the outside of the fiber-braided structure reinforcement layer is wrapped by the pouring layer; the fiber-braided structure reinforcement layer is a sleeve-mesh-shaped braided fabric formed by braiding a composite in a braiding machine and is single-layer or multilayer; the pouring layer is formed by wrapping an external cylinder of the fiber-braided structure reinforcement layer by using various materials through a pouring process; and the pouring layer is made of resin, rubber or polyurethane. The composite layer disclosed by the invention is braided in a reciprocated way by using the braiding machine, so that the thickness of an outer layer is increased, and the drop of the fiber-braided structure reinforcement layer is avoided; the outer cylinder is formed by pouring a special high-strength material for the backing roll; and the backing roll fiber-braided composite layer is light in weight, high in tensile strength, free of breakage at the outer layer, small in rotary inertia, high in outer cylinder precision, free of deformation, free of mechanical waves on the formed backing roll, antistatic, corrosion-resistant, high-temperature-resistant and long in life, so that the product quality is improved, and the productivity is increased.
Owner:XUZHOU HENGHUI BRAIDING MACHINE

A kind of preparation method of machine-woven carpet without back glue process

The invention discloses a preparation method of a machine-woven carpet without adhesive backing process. The second coating layer is filament or staple fiber yarn formed by hot-melt fibers, and the first coating layer is polyester fiber filament or staple yarn. Fiber yarn, the second covering layer accounts for 20%-50% of the total mass of the composite yarn, the first covering layer accounts for 10%-15% of the total mass of the composite yarn, and the rest is the core yarn to obtain the pile weft yarn . When hot-melt copolyester fibers are used as bonding materials to produce adhesive-free carpets, and pile yarns made of polyester fibers, when the hot-melt copolyester fibers are heated above their melting point in the hot-pressing process, they melt, and the fibers The conformation of the macromolecular chain changes, and through the transition of the chain segment, the entire macromolecular chain slips and viscous flow occurs. After curing, the pile and weft yarn as well as the weft and warp yarn are effectively consolidated, which enhances the pull-out strength of the pile and the carpet Excellent shape retention and dimensional stability, thereby omitting the back glue process in the carpet preparation process, making the prepared carpet more environmentally friendly.
Owner:QINGDAO UNIV

Composite-forming ultra-light floor roller

The invention discloses a composite-forming ultra-light floor roller. The composite-forming ultra-light floor roller comprises a shaft core and a fiber-woven composite layer. An outer cylinder of the shaft core is covered with the structural-fiber-woven composite layer; the shaft core comprises an outer barrel, an inner barrel and supports; the inner barrel and the outer barrel are homocentric, and the multiple supports are arranged between the inner barrel and the outer barrel and evenly distributed between the inner barrel and the outer barrel in a spiral mode; a composite layer comprises a fiber-woven-structure enhancement layer and a pouring layer; the fiber-woven-structure enhancement layer is covered with the pouring layer, is a sleeve mesh-shaped woven fabric woven with composite materials in a weaving machine and comprises a single or multiple players. The composite-forming ultra-light floor roller has the advantages that the mass is light, the strength is high, the rotational inertia is small, the accuracy of the outer cylinder and the extension strength are high, the floor roller is not deformable and not straightened, the outer layer is not fractured, and the formed floor roller is free of mechanical wave, resistant to static electricity, corrosion and high temperature and long in service life; the making processes are reduced, energy is saved, consumption is reduced, the manufacturing cost and the maintaining cost are low, the parking time is short, and the product quality and the production yield are increased.
Owner:XUZHOU HENGHUI BRAIDING MACHINE

Preparation method of woven carpet without gumming process

The invention discloses a preparation method of a woven carpet without a gumming process. A second coating layer is a hot-melt fiber filament or a staple fibre yarn, a first coating layer is a polypropylene fiber filament or a staple fibre yarn, the second coating layer accounts for 20%- 50% of the total mass of a composite yarn, the first coating layer accounts for 10%-15% of the total mass of the composite yarn, the balance is a core yarn, and a pile weft yarn is obtained by adopting the manner. When the non-adhesive carpet is produced by using a hot-melt ethylene-vinyl acetate copolymer fiber as a bonding material in combination with the pile yarn made of a polyester fiber, the melting occurs when the hot-melt ethylene-vinyl acetate copolymer fiber is heated to be higher than the melting point in a hot pressing process, the conformation of a fiber macromolecular chain is changed, the whole macromolecular chain slips through the transition of chain segments, viscous flow occurs, thepile and weft yarns as well as the weft yarns and warp yarns are effectively solidified after curing, and the pull strength of the pile and the shape retention and dimensional stability of the carpetare enhanced, so that the gumming process in the carpet preparation process is omitted, and the produced carpet is more environmentally friendly.
Owner:QINGDAO UNIV
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