142results about How to "Reduce flash" patented technology

The present invention relates to a silencer for reducing muzzle blast and noise of firearms or similar devices. The present silencer has a hollow cylindrical or other shape casing comprising front and rear end caps and an opening aligned along a longitudinal axis defining a passage for a projectile and propellant gases to emerge from the muzzle opening. A plurality of serially placed baffles of symmetrical or slanted orientation and intervening coaxial spacers are positioned within the casing and define a multitude of chambers among the baffles, spacers, and outer housing. The baffles shear propellant gases away from the projectile path and through openings or ports into additional chambers formed between the spacers and outer housing. The arrangement of baffles and spacers provides flow-impeding paths, dispersion, and controlled expansion of gases and lowers gas temperature to reduce audible noise and observable signature of the muzzle blast.

A suppressor and flash hider device for firearms defines primary and secondary propellant gas paths that function simultaneously to quickly decrease gas pressure within the tubular housing of the suppressor to minimize blow-back toward the firearm user. The tubular housing has a collet-like firearm clamping system that establishes symmetrical clamping that will not tend to force the suppressor off coaxial alignment with the firearm barrel to which is mounted. A front wall mounted to the housing defines a central projectile port through which propellant gas also passes and defines an array of angularly oriented discharge passages for discharging propellant gases from the secondary propellant gas path forwardly and angularly toward gas being discharged from the projectile port of the front wall.

A muzzle brake and stabilizing device is provided for a firearm having a barrel, the barrel having a barrel axis, a muzzle, and a breech end. The muzzle brake comprises walls defining a first chamber adjacent the muzzle end of the barrel, the first chamber having a substantially closed end wall and side wall through openings. Walls defining a second chamber are proximate the first chamber, the second chamber has a substantially closed end wall and side wall through openings. Walls defining a third chamber are proximate the second chamber, the third chamber with a substantially open end and having side wall through openings. Walls defining an intermediate chamber are adapted to receive gases passing through the side walls of the first, second, and third chambers, the intermediate chamber with closed side walls and a substantially closed end wall. Walls defining a fourth chamber are proximate the end wall of the intermediate chamber, the fourth chamber having a substantially open end, and side wall closed end openings.

A gun suppressor having a single or multiple vacuum chambers that create a vacuum enclosed volume for gases to expand into. Accordingly, the pressure of the gas that exits the suppressor is reduced significantly; therefore, the sound of the gun firing is more silent than conventional silencers. Prior to firing the gun, a vacuum seal is placed at the exit orifice of the suppressor and a vacuum is created inside of the suppressor with the use of a vacuum pump. The vacuum chamber reduces the pressure wave caused at the end of the firearm's barrel. When the firearm is discharged, the gases fill the vacuum chamber instead of exiting at normal atmospheric pressure level. As the bullet continues its travel through the end of the suppressor, it perforates the vacuum seal and continues its flight path.

A technology for manufacturing the coupler tail frame of cargo train by forging includes such steps as blanking, heating, making raw coupler tail frame, die forging step by step, that is, forging one end and then another end, removing excessive edge, bending an welding. Its die set is composed of upper die with internal cavity whose length is equal to that of finished blank, and lower die with internal cavity having a central locating pit.

The invention relates to an upsetting force self-compensation stirring tool suitable for aclinal frication stir welding. The upsetting force self-compensation stirring tool comprises a clamping section, a cylindrical section and a stirring needle. The clamping section, the cylindrical section and the stirring needle are of an integrated structure from top to bottom. The clamping section is a cylinder, and a plane used for fastening is milled in the side face of the clamping section. The cylindrical section is a cylinder, the diameter of the cylindrical section is larger than that of the clamping section, and a heat radiating groove is formed in the circumferential direction of the cylindrical section. The lower end face of the cylindrical section is a shaft shoulder. The outer circle of the shaft shoulder is a plane and is provided with at least two archimedes screw grooves. The inner circle of the shaft shoulder is inwards concave. The inwards-concave part and the stirring needle achieve smooth transition. The stirring needle is a thick-end-up circular truncated cone. The side face of the stirring needle has a thread feature. The upsetting force self-compensation stirring tool anda conventional inwards-concave type stirring tool have a function that upsetting force self-compensation is generated for welded material along with welding, and the hole defect liable to occur to aclinal frication stir welding can be avoided effectively.

The present invention discloses a rhodium catalyst for synthesizing acetic anhydride by acid methyl carbonyl, which is a cis-dicarbonyl rhodium cation structural catalyst formed by carbonyl rhodium and ligand function; the catalyst is a chelate square plane complex; the cation part of the catalyst is cis-dicarbonyl rhodium cation and the ligand is acetyl morpholine. The catalyst not only shows excellent thermal stability, but also keeps excellent catalyzing activity during the reaction of synthesizing acetic anhydride by acid methyl carbonyl; simultaneously the solubility of the catalyst species can also be increased in a reaction system, thus avoiding the addition of acetic acid and / or acetic anhydride as a catalyst solvent in the industrial production, thus effectively reducing the load of flash evaporation and evaporation and improving the manufacture efficiency of acetic anhydride synthesis by acid methyl carbonyl. The present invention also discloses a preparation method of synthesizing acetic anhydride by acid methyl carbonyl by the rhodium catalyst..

A bulked continuous filament with a three-sided exterior configuration is characterized in that each side has a smoothly curved contour extending between a first and a second rounded tip with an inwardly extending depressed region being disposed adjacent to each tip. Generally, the filament has an exterior modification ratio in the range from about 1.4 to about 2.0, and a tip ratio in the range from about 2.0 to about 4.0. The filament generally delta-shaped void with three major apices extending centrally and axially therethrough. Each side of the void is convexly shaped and formed from a pair of facets that meet to define minor apices. The void is oriented such that each major apex extends toward the approximate midpoint of one side of the exterior of the filament and each minor apex extends toward a tip of an exterior side. The distance (RM) from the geometric center of the void to each major apex and the distance (Rm) from the geometric center of the void to each minor apex defines an apex ratio (RM / Rm) in the range from about 1.0 to about 1.55. The void occupies from about four percent (4%) to about twenty-five percent (25%) of the cross sectional area of the filament.

The invention discloses an antimicrobial low-warpage low-flash PPS composite material and a preparation method thereof. The material is prepared from, by weight, 31.5-48% of PPS resin, 6-12% of PPE resin, 40-45% of glass fibers, 8-12% of antimicrobial agent, 0.5-1% of nucleating agent, 0.4-0.5% of antioxidant and 0.5-0.6% of lubricating agent. An engineering plastic, namely PPS, serves as a main body, the PPE resin, the glass fibers, the antimicrobial agent, the nucleating agent the antioxidant and the lubricating agent are added, the raw materials are mixed together and melted through a double-screw extruder, and then the antimicrobial low-warpage low-flash PPS composite material which is capable of meeting the antimicrobial requirements of household appliances is prepared. The material has the advantages of being antimicrobial, low in warpage and low in flash on the basis of ensuring the original excellent mechanical performance, heat resistance, fire resistance and electrical performance of PPS.

The invention discloses a boot file system mounting method and apparatus. The method comprises the steps of creating a first file system; creating a second file system, and generating a whole mirror image; extracting a second mirror image file from the whole mirror image, and establishing a first correlation between the second mirror image file and a pre-created loopback device of the first file system; according to the first correlation, mounting the loopback device to a read-write directory, and establishing a second correlation between the read-write directory and the loopback device; and according to the second correlation, converting the read-write directory into a root directory of a preset running environment, and based on the root directory of the preset running environment, booting a startup script. The technical problem of relatively high resource consumption due to occupation of relatively large flash memory and running memory in a method in the prior art is solved.

A gun silencer comprises and outer tube having and single inner vacuum chamber or multiple vacuum chambers that creates a vacuum enclosed volume for the gases to expand into, so the pressure of the gas that exits the suppressor is reduced significantly; therefore, the sound of the gun firing is more silent than conventional silencers. Prior to firing the gun, a vacuum seal is placed at the exit orifice of the suppressor and a vacuum is created inside of the suppressor with the use of a vacuum pump. The inner vacuum chamber reduces the pressure wave caused at the end of the firearm's barrel. When the firearm is discharged the gases fill the vacuum chamber instead of exiting at normal atmospheric pressure level. As the bullet continues its travel through the distal end of the suppressor, it will perforate the vacuum seal and continue its flight path.

The invention discloses a casting forming process for a large wind power planetary carrier casting. The planetary carrier casting comprises an upper annular plate and a lower annular plate which are vertically connected with triangular vertical columns, and a parting face of the planetary carrier casting is arranged on the interfaces of the upper annular plate and the triangular vertical columns;a first sand core and a second sand core are arranged between the upper annular plate and the lower annular plate, a triangular air outlet channel is formed in the outer sides of the sand cores, and vertical air outlet channels are formed in the centers of the sand cores; open risers are arranged right above the intersections of the upper annular plate and the triangular vertical columns, blinderrisers are arranged on the lower annular plate, and external chills are arranged under the lower annular plate. Pouring is carried out by adopting combined pouring mode of bottom-back pouring gates and stepped pouring gates. The planetary carrier produced by the method is good in forming and qualified in size, the matric structure of the casting is compact, joint parts of the triangular verticalcolumns and the upper annular plate and the lower annular plate has no crack defect, the other parts only need to undergo modification repair welding, the production cost of the casting is reduced, and higher economic benefits are achieved.