66results about How to "Low production and processing costs" patented technology

The invention provides an automatic-control constant-speed descending device. A reel is suspended or supported on a cross rod of a holder through elastic mechanisms mounted on a center shaft of the reel; two groups of elastic mechanisms are mounted on two sides of the reel, respectively; the two ends of the center shaft extend into sliding grooves of two uprights of the holder, respectively; when the reel is under a gravity loading effect, the reel is capable of rotating along with the center shaft relative to the elastic mechanisms and capable of sliding downwards along the sliding grooves to stretch or compress the elastic mechanisms; a hydraulic damping mechanism is arranged such that a resistance torque applied to the center shaft is higher when the elastic mechanisms are stretched or compressed to a greater extent, and the resistance torque applied to the center shaft is lower when the elastic mechanisms are stretched or compressed to a smaller extent, thereby maintaining constant-speed rotations of the reel. The automatic-control constant-speed descending device does not need power and manual braking and is capable of keeping constant-speed descending under different gravity loads.

The invention relates to the field of foam ceramics, in particular to double-scale foam ceramics with macro-scale three-dimensional communicated hole diameter and micron-grade three-dimensional communicated hole diameter and a preparation method thereof. The silicon carbide foam ceramics have a three-dimensional communicated network structure; a millimeter-grade hole diameter is expressed in macrography; and a micron-grade mutual communicated mesh is expressed in a ceramic skeleton rib. A hole forming agent is uniformly mixed into silicon carbide slurry in the process of moulding a foal ceramic blank so that the silicon carbide foam ceramics are made into double-scale foam ceramics; and the double-scale silicon carbide foam ceramics are three-dimensional communicated network foam ceramics which simultaneously have macro-millimetre scale hole diameter and skeleton rib internal micron scale hole diameter. By being used as a reinforced body of a ceramic / metal double-continuous phase composite material, the double-scale silicon carbide foam ceramic material can eliminate foam skeleton cracks in a composite material, improve composite quality and expand the application of the composite material in friction brake, armour protection, electronic packaging, and the like.

The invention provides a kind of carbon nanotube / short-fiber composited nano-carbon paper and a continuous preparation method thereof. The nano-carbon paper mainly comprises disordered carbon nanotubes and short fibers, and is in a non-woven form. The preparation method of the nano-carbon paper comprises the following steps that: the disordered carbon nanotubes are dispersed in a solvent so as to form a dispersion liquid; then, mixing and dispersing the short fibers so as to form a size; preparing an initial film through vacuum assisted flow-casting film-forming; and then, removing polymers in the initial film through subsequent processing so as to obtain a target product. The composited nano-carbon paper disclosed by the invention integrates the huge specific surface areas, superior conductivity and functional characteristics of the carbon nanotubes and the enhancement effect of the short fibers on the strength and flexibility of the carbon paper, therefore, the composited nano-carbon paper is good in self-supporting property and flexibility; meanwhile, through the direct film-forming implemented by using a flow-casting method, the continuous film-forming of the nano-carbon paper is realized, therefore, the nano-carbon paper has the advantages of high efficiency, rapidness and easy large-scale preparation. The composited nano-carbon paper disclosed by the invention has a wide application prospect in the fields of energy electrodes, catalytic carriers, environmental management, static resistance, electromagnetic shielding, wave-absorbing camouflage, and the like.

The invention provides a V-groove substrate that can be used for the input and output ends of waveguide chips, including a substrate body and one or more V-grooves on it, and the V-groove includes an input section, a connecting section and an output section . In one implementation, the V-shaped groove is made into an optical fiber array and used for the output end of the waveguide chip, and the end face of the substrate body is perpendicular to the surface; the input section of the V-shaped groove is straight and is in line with the normal line of the end face of the substrate body. A certain deflection angle; the connecting section of the V-shaped groove is arc-shaped, and its bending radius is greater than the minimum bending radius required to meet the fiber macrobending loss index; the output section of the V-shaped groove is straight; when the number of V-shaped grooves is multiple, The V-shaped grooves are arranged in parallel, and the intervals between the V-shaped grooves are equal. Compared with the traditional V-groove substrate, the deflection angle of the V-groove substrate is flexible and adjustable, the control precision is extremely high, it can be produced in batches, and the processing cost is low.