41results about How to "Increase the surface friction coefficient" patented technology

The invention discloses a construction method of a composite column integrally formed by 3D printing and knitting and the composite column. The construction method comprises the steps that (1) after spatial modeling according to the architectural model, spatial shape optimization is performed according to the functional requirements, and the wire knitting tightness is designed according to the bearing capacity requirements; (2) according to a determined spatial shape and the determined knitting tightness, a matrix printing sequence and anchoring points of wires are arranged to obtain a printing and knitting integrated process, and 3D printing materials are prepared; and (3) according to the printing and knitting integrated process, a solid composite column or a column shell is printed layer by layer. According to the construction method of the composite column integrally formed by 3D printing and knitting, the high-strength wires are knitted in when printing a matrix, and the tensile resistance, shear resistance, abrasion resistance and crack resistance properties of the 3D printing matrix are improved while replacing a steel bar.

The invention discloses a method for coating and modifying surface of inorganic paper making fiber calcium sulfate whisker, which comprises the following steps: 1) mixing the calcium sulfate whisker with a dispersant relative to 1-10% of mass fraction of calcium sulfate whisker, dispersing the calcium sulfate whisker; filtering and drying after treating to obtain the calcium sulfate whisker with high dispersion; 2) measuring water, ethanol, ammoniacal liquor and organosilicon source with set volume ratio, placing the water, ethanol and ammoniacal liquor in a three-mouth flask, performing magnetic stirring, adding a proper amount of surfactant, uniformly mixing for standby; 3) adding the prepared calcium sulfate whisker with high dispersion in the three-mouth flask filled with a mixed solution, uniformly mixing, slowly adding the measured organosilicon source by batches; and 4) stirring and modifying the prepared mixed solution at the temperature of below than 25 DEG C, subsiding for 8-10 hours, filtering, and drying under the temperature of 95% to prepare the modified calcium sulfate whisker.

The invention belongs to the technical field of damping material preparation, and discloses a method for preparing an iron tailings sand damping material with modified surface friction coefficient and viscosity. Vinyl triethoxysilane and styrene are used for step-by-step modification; vinyl Triethoxysilane is used as a preliminary modifier on the surface of iron tailings sand to evenly cover a layer of vinyl on the surface of tailings sand. The content of vinyltriethoxysilane is controlled at 1% of the mass of the ethanol-water mixed solution, and the amount of ethanol and aqueous solution is 1%. The mixing mass ratio is 90:10; styrene is used as a secondary modifier, and the tailings sand with a uniform layer of polymer on the surface is obtained by polymerization initiated by potassium persulfate, and the particle damping performance is regulated from the surface friction coefficient and surface structure. The invention changes the component structure of the tailings sand surface, improves the surface friction coefficient, and also changes the viscous performance, and the damping value is increased by more than 10% compared with ordinary granular damping materials.

The invention discloses a torsion-resistant pull rod structure of a power assembly. The torsion-resistant pull rod structure of the power assembly comprises a torsion-resistant pull rod framework, wherein the two ends of the torsion-resistant pull rod framework are respectively provided with a large bushing and a small bushing; the large bushing comprises a large bushing rubber ring and a large bushing liner; the large bushing rubber ring is provided with a forward gear rubber impact block and a reverse gear rubber impact block; the ends of the forward gear rubber impact block and the reversegear rubber impact block are tapered; the two sides of the forward gear rubber impact block are provided with forward gear impact block buffer grooves; and two sides of the reverse gear rubber impactblock are provided with reverse gear impact block buffer grooves. According to the invention, the rigidity curves of an initial section and an end section in an acceleration process of a three-gear area are smooth, and abrupt change of rigidity does not exist, so that the vibration strength is reduced, and the NVH performance of a whole vehicle is improved; and a special gasket is arranged betweenthe large bushing liner and a front auxiliary frame assembly, and a small bushing rubber ring is provided with a limiting boss and a buffer groove, so that the connection stability of the two ends ofa torsion-resistant pull rod is enhanced.

The invention discloses a metal hip-joint combination handle including a handle body of a femoral bone handle, a neck body of the femoral bone handle, a near-end lining of the femoral bone handle, positioning pins and fixing bolts. With functional and physical design of each part of the metal hip-joint combination handle, the data of the near-end lining of the femoral bone handle is introduced into an electron beam melting and molding device, the titanium alloy power within the device is scanned, melted and molded into a conic cylinder body with intensity and elasticity similar to those of the biological cancellous bone by means of electron beam, the handle body part and the neck body part of the femoral bone handle are manufactured by precise forging[w2] or machine work, then the handle body of the femoral bone handle, the neck body of the femoral bone handle and the near-end lining of the femoral bone handle are serially assembled as a whole through positioning pins and fixing bolts, thus the metal hip-joint combination handle is configured. The combination handle has advantages of porous structure growing within cells, excellent dynamic and biological performance similar to those of human bones, high friction coefficients, stable configuration, multi combination modes among parts, high anastomosis degree and better matching capability with human medulla ossium lumen, relieving pains, stabilizing arthrosis, straightening monstrosity, improving functions of joint, facilitating operation execution, long service life and popular application.

The invention discloses an automobile paint surface polishing agent and a preparation method thereof, and relates to the technical field of automobile paint surface processing. The polishing agent isprepared from hydrophobic repairing abrasive, a surfactant (fatty alcohol polyoxyethylene ether), an oil remover (dimethyl silicone oil), an excipient (sodium alginate), an aqueous thickening agent (potassium sorbate), a composite brightener, and a diluent prepared by mixing a plurality of solvents. The raw materials are mixed and stirred, and then the mixture is subjected to vacuum defoaming to obtain the polishing agent. After the polishing agent is painted on an automobile paint surface, the paint surface is fully grinded, a compact protective film is formed, the repairing performance is good, the automobile paint surface has good glossiness and brightness, and the color difference between processed paint surface and the original paint surface is small. A polishing device, which can beused to artificially adjust the force of spraying the polishing agent, is adopted; a foldable airbag, which is safe and is convenient to replace, is used to store the polishing agent; and the polishing quality and polishing speed are largely improved.

The invention discloses preparation and application of metal artificial bone trabecula for medical purposes. The structural design of the metal artificial bone trabecula is completed by a computer, and then inputted in an electron beam fusion former; the high temperature generated by electron beams is used to carry out the stratified scanning and high-temperature fusion to titanium alloy powder in the former so as to obtain the metal artificial bone trabecula with bio-cancellous bone morphology, strength and elasticity modulus and a rough and loose outer surface formed by a porous structure. The obtained artificial bone trabecula has mechanical and biological characteristics similar to a human bone, high surface friction coefficient, stable structure and wide range of application, and is applicable to various bone defects, bone filling, bone supporting, bone remodeling and bone repair in a human skeletal system as well as bone restoration of bone remodeling and bone repair of different bone joints of a human body.