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110results about How to "Change elasticity" patented technology

Polyamide 66 membrane covered nickel-titanium alloy intravascular scaffold and preparation method thereof

The invention relates to a polyamide 66 membrane covered nickel-titanium alloy intravascular scaffold and a preparation method thereof. The intravascular scaffold comprises a nickel-titanium alloy scaffold and a polyamide 66 membrane, and is provided with a tubular blood vessel shaped structure or a cylindrical blood vessel shaped structure, wherein the surfaces of an inner wall and an outer wallof the scaffold are covered by thin membranes with the thickness between 0.2 and 5 millimeters. The preparation method comprises the following steps of: preparing 1 to 20 percent of polyamide 66 solution by using formic acid as a solvent; coating a layer of the polyamide 66 solution on a glass rod and volatizing the solvent; sleeving a nickel-titanium shape memory alloy expanding scaffold on the glass rod; coating another layer of the polyamide 66 solution on the glass rod and volatizing the solvent; and peeling off the polyamide 66 membrane and the nickel-titanium alloy intravascular scaffold from the glass rod, and performing vacuum drying to obtain the polyamide 66 membrane covered intravascular scaffold. The intravascular scaffold prepared by the method has a stable structure, good mechanical property, transportability and anti-seepage property, overcomes the performance defects of a single material, and has a simple preparation process.
Owner:DONGHUA UNIV

Tool for ball screw pair outer raceway grinding and grinding force loading

The invention provides a tool for ball screw pair outer raceway grinding and grinding force loading. The tool comprises a flexible nut, a grinding outer cover, a sensor assembly, a thread end cap, a polyurethane elastic body, a polyurethane buffering body and an outer cover base. The outer cover base is arranged at the front end of the grinding outer cover and forms a grinding cavity with the grinding outer cover, a first lead screw through hole is formed in the outer cover base, and the flexible nut is arranged in the grinding cavity and connected with a lead screw in a matched mode. The flexible nut is sleeved with the polyurethane buffering body, and the polyurethane buffering body is sleeved with the polyurethane elastic body. The inner wall of the polyurethane elastic body and the outer wall of the polyurethane buffering body are tightly matched, and the outer wall of the polyurethane elastic body and the inner wall of the grinding cavity are tightly matched. The thread end cap is provided with a second lead screw through hole and extends into the grinding cavity to be fixed from the rear end of the grinding outer cover, the sensor assembly is arranged between the thread end cap and the polyurethane elastic body and provided with tension and pressure sensors, and the pressure sensors measure the axial pressure of the thread end cap on the polyurethane elastic body.
Owner:NANJING UNIV OF SCI & TECH

Damping-rigidness-controllable double-freedom-degree vibration active control platform

A damping-rigidness-controllable double-freedom-degree vibration active control platform comprises a cross-shaped beam frame and a square base which are connected through a flexible hinge. A cross-shaped beam of the cross-shaped beam frame is distributed in the diagonal directions of the square base. A structure column is arranged at the center of the cross-shaped beam frame. Sensors and actuators are connected between the lower portions of the diagonal top ends of the cross-shaped beam frame and the square base respectively. Four limiting columns are arranged between the cross-shaped beam of the cross-shaped beam frame and the square base respectively. Prearranged gaps are reserved between the limiting columns and the cross-shaped beam frame. Four balancing weights are fixed on the lower portion of the cross-shaped beam frame between the sensors or the actuators and the limiting columns respectively. Twisting limiting spring pieces are arranged at the symmetrical positions on the lower portion of the cross-shaped beam frame between the limiting columns and the flexible hinge. The electromagnetic type sensors and the electric-damping electric-rigidness actuators are used to achieve detecting of angular speed and actuating, the flexible hinge and the spring piece with changeable thickness are combined to achieve controllable damping and rigidness in a quantifying mode, and double-freedom-degree vibration active control in the x direction and the y direction of the structure is achieved.
Owner:XI AN JIAOTONG UNIV

Magneto-rheological elastomer double-annular-membrane damper

The invention discloses a magneto-rheological elastomer double-annular-membrane damper which comprises a work cylinder, a damping rod, large annular damping membranes, small annular damping membranes, an annular damping washer and two single-face annular electromagnets. The work cylinder comprises a drum and the two single-face annular electromagnets, the two single-face annular electromagnets are fixed to the two ends of the drum, and opposite poles of the two single-face annular electromagnets are opposite in direction. The large annular damping membranes and the small annular damping membranes are respectively composed of a magneto-rheological elastomer, the inner circumferences of the small annular damping membranes are fixed to outer circumferences of the tops of inner circular tubes, the inner circular tubes are fixed into center holes of the single-face annular electromagnets, the outer circumferences of the small annular damping membranes are fixed to the inner circumference of the annular damping washer, the outer circumference of the annular damping washer is fixed to the inner circumferences of the large annular damping membranes, and the outer circumferences of the large annular damping membranes are fixed to the inner circumference of a work cylinder circular tube. One end of the damping rod is fixed to the annular damping washer through a support, and the other end of the damping rod extends out of one end of the work cylinder through sliding bearings in the circular tubes, at one end of the work cylinder, of the single-face annular electromagnets.
Owner:谭苹

Toy gyro good in defensiveness

The invention provides a toy gyro good in defensiveness. The toy gyro comprises a spiral cover, a spiral sheet, a spiral base and a hillock point, and is characterized by further comprising an elastic shock absorption piece for buffering impact force when the gyro is impacted. The shock absorption piece is provided with an elastic part used for resisting impact and a connection part fixedly connected with the spiral base. The elastic part is located on the periphery of the spiral base through fixed connection of the connection part and the spiral base, and therefore when the gyro competes with other gyros and the other party impacts on the elastic part, impact force will be reduced due to elastic deformation of the elastic part; thus, the shock absorption effect is achieved to make the gyro rotate stably, anti-impact force is produced and returned to the other party at the same time to interfere the other party, and accordingly the win rate of the gyro is improved. The toy gyro is strong in interestingness, the elastic property of the elastic shock absorption piece can be changed by a player according to judgments so as to achieve a better anti-impact effect, the method to play the toy gyro is novel, the toy gyro can attract more players, and manipulative ability and competitive ability of children can be trained at the same time.
Owner:ALPHA GRP CO LTD +2

Method and system for controlling end portion vibration of generator winding

The invention discloses a method and system for controlling end portion vibration of a generator winding. The method comprises: a vibration amplitude of the end portion of a generator winding is monitored in real time; the vibration amplitude is compared with a preset vibration amplitude; if the vibration amplitude is larger than the preset vibration amplitude, adjustment of the temperatures of cooling water and hydrogen is triggered; the temperatures of cooling water and hydrogen are adjusted to change the inherent frequency of the end portion of the generator winding; and when the vibrationamplitude of the end portion of the generator winding is monitored to be reduced to be below a target vibration amplitude and the value is stable, adjustment is completed. According to the invention,on the basis of a relationship between a generator temperature field and a modal frequency of the winding end structure, the temperature field inside the generator is changed based on the temperaturesof cooling water and hydrogen, so that the material structural force and elasticity modulus of the end portion of the generator winding are changed and thus the inherent frequency of the end portionof the generator stator winding is changed. Therefore, the excitation force frequency is avoided and the vibration amplitude is reduced.
Owner:GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD

Double-scraper diaphragm butterfly valve

The invention discloses a double-scraper diaphragm butterfly valve. The double-scraper diaphragm butterfly valve is characterized in that a valve body, a support and an execution mechanism are included, and the support and the execution mechanism are sequentially connected with the valve body; a butterfly plate is arranged in the valve body; a tetragonal-prism-shaped groove ring lug and a cylindrical groove ring lug which are parallel to the plane of the butterfly plate are arranged above and below the rear end of the butterfly plate; a tetragonal-prism-shaped upper valve rod is arranged in the tetragonal-prism-shaped groove ring lug; a cylindrical lower valve rod is arranged in the cylindrical groove ring lug; the butterfly plate is further connected with a sealing structure, and the sealing structure comprises a valve seat pressing plate, a valve seat, a diaphragm ring, a pressing plate ring, a butterfly plate sealing pad, a front pressure cavity and a rear pressure cavity; and a diaphragm front end thrust groove, front through-flow holes and pressing plate bolt holes are formed in the pressing plate ring. The elastic diaphragm pressure self-sealing structure is adopted, the diaphragm front end thrust groove and a diaphragm rear end thrust face achieve the function of scrapers, and special connection of the upper valve rod and the lower valve rod and locking prevention are achieved; low twisting force and the small structure are achieved, and compressive resistance is high; and the butterfly valve has the beneficial effects of being reliable in performance and long in service life.
Owner:天津自阀流体控制有限公司

Three-dimensional elastic rotating color changing fiber and spinneret plate thereof

The invention relates to a three-dimensional elastic rotating color changing fiber and a spinneret plate for manufacturing the three-dimensional elastic rotating color changing fiber. The specific rotating color changing effect of the three-dimensional elastic rotating color changing fiber is ensured through the dye-uptake difference between two components of the three-dimensional elastic rotating color changing fiber and a three-dimensional spiral crimp structure of a parallel composite fiber. The three-dimensional elastic rotating color changing fiber and the spinneret plate are characterized in that each micropore of the spinneret plate for producing the three-dimensional elastic rotating color changing fiber is shaped like the Arabic numeral eight; a composite spinning assembly and a specially-shaped spinneret assembly are adopted; moisture absorption and sweat releasing performance of the three-dimensional elastic rotating color changing fiber can be improved due to grooves in the surface of the three-dimensional elastic rotating color changing fiber. The three-dimensional elastic rotating color changing fiber has the stable crimp resilience and is simple in manufacturing process, the elastic range of the three-dimensional elastic rotating color changing fiber can be adjusted according to the heat treatment technology, and the three-dimensional elastic rotating color changing fiber can be widely applied to sports wear, underwear, woven tapes and the like.
Owner:TAICANG RONGWEN SYNTHETIC FIBER

Wing of micro ornithopter

ActiveCN102501972AFlat stiffness distributionSmooth transition of stiffness distributionOrnithoptersAcute angleFront edge
The invention discloses a wing of a micro ornithopter. According to the present invention, a main beam is level and straight; the front edge points of five wing ribs are fixed on the main beam; the wing rib No.1, the wing rib No.2 and the wing rib No.3 are perpendicular to the main beam; the wing rib No.4 and the wing rib No.5 form acute angles with the tip part direction of the main beam; the chord lengths of the wing rib No.1, the wing rib No.2 and the wing rib No.3 are the same; the chord length of wing rib No.4 and the chord length of the wing rib No.5 are sequentially reduced, and are shorter than the chord length of the wing rib No.1; an assistant beam is an arc structure; the outer edge point of the assistant beam is fixed on the main beam between the end point of the tip part of the main beam and the rear edge point of the wing rib No.5, the root part of the assistant beam passes through the rear half part of the wing rib No.1, the assistant beam contacts the positions corresponding to the five wing ribs and is fixed with the positions corresponding to the five wing ribs; the main beam, the assistant beam and the wing ribs form a wing structure frame, and a skin is adhered above the frame to form a complete wing. With the present invention, the stiffness distribution of the whole wing flatly transits, the structure continuity is good, the good force loading property is provided, the structure is simple, and the wing of the present invention is convenient to manufacture.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Outdoor self-erasing camera for mobile internet

ActiveCN110971802ASolve the problem of not automatically adjusting the cleaning outputSolve the problem of inaccurate cleaning frequencyTelevision system detailsColor television detailsInternet usersMetal sphere
The invention relates to the technical field of photographic equipment for the Internet. and discloses an outdoor self-erasing camera for mobile internet. The camera comprises a photography body. Anintermittent structure is connected to the interior of a movable frame; a first metal ball is connected to the left end of a fixing rod, an expansion strip is connected to the right end of a connecting rod, a cable is arranged on the outer side of a wire coil, a metal sheet corresponding to the first metal ball is arranged in the photographing body, a water bag is connected to the lower end of tahose, a second metal ball is arranged on the upper portion of the supporting sliding block, and a variable resistor is arranged on the right portion of the photographing body. A sliding rod is pushedto move rightwards through the upper end of an expansion strip; rainwater flows into the water bag through a conical groove and the hose. A supporting sliding block drives the second metal ball to slide on the variable resistor, the size of the rainwater can be indirectly detected through the weight of the water bag, and therefore the output size of the driving shaft is changed, and the structuresolves the problem that an existing internet camera cannot automatically adjust, clean and output during photographing.
Owner:徐正才

Preparation of functionalized carbon nano-tube modification polyurethane elastomer

The invention relates to a method for preparing a functional carbon nanotube modified polyurethane, which comprises: firstly, preparation of the functional carbon nanotube, namely, dissolving a carbon nanotube into a mixed solution of concentrated sulfuric acid and concentrated nitric acid the volume ratio of which is 3:1, performing ultrasonic vibration for 1 to 2 hours, heating the mixed solution in water bath, refluxing the mixed solution for 3 to 4 hours, taking out the mixed solution, and obtaining CNT-COOH after dilution, centrifugation, filtration and drying of the mixed solution by deionized water; and dispersing the CNT-COOH into an organic solvent, adding isocyanate into the organic solvent, performing heating in water bath, and obtaining the functional carbon nanotube; and secondly, preparation of a functional carbon nanotube / polyurethane composite system, namely, dissolving the functional carbon nanotube into a thermoplastic polyurethane solution by a solution mixing method, and processing the functional carbon nanotube to form the functional carbon nanotube / polyurethane composite system; or directly mixing the functional carbon nanotube and polyurethane by means of fusing and processing, and extruding the functional carbon nanotube to form the functional carbon nanotube / polyurethane composite system. The method is easy, simple and convenient, has simple equipment,and is suitable for mass production and used in the fields of material reinforcement, electrical conductance, heat conduction and so on; and the elasticity, the mechanical property and the thermal stability of the material obtained are changed correspondingly.
Owner:DONGHUA UNIV
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