17results about How to "Reduce stress concentration points" patented technology

The invention relates to the technical field of mechanical transmission, and provides a connecting rod transmission mechanism and a mirror image engine. The connecting rod transmission mechanism comprises a power sliding block, a power connecting rod and two power pistons, the power connecting rod comprises a connecting rod base body and two linear rod parts, the linear rod parts extend in the first direction, the front end of each linear rod part is connected with one power piston, and the rear end of each linear rod part is fixedly connected with the connecting rod base body; the two linear rod parts are located on the two opposite sides of the connecting rod base body in the first direction, and the power sliding block is installed on the connecting rod base body in a sliding mode in the second direction. The linear rod part does not need to contain a bearing, rotation motion does not exist, the overall cross section is uniform or roughly uniform, standard sinusoidal motion / cosine motion is met, the size reduction design of the linear rod part and the air cylinder is facilitated, the compression ratio in the air cylinder is increased, the combustion efficiency is improved, the overall structure of the engine is more compact, and the needed engine cabin space is reduced. And the power-to-weight ratio and the acceleration performance of the vehicle can be improved.

The utility model discloses a high-performance milling cutter for processing titanium alloy, which comprises a cylindrical cutter bar and a cutter head, the end part of the cutter head far away from one end of the cutter bar is hemispherical, the cutter head comprises a front end surface and six circumferential blades, the six circumferential blades are uniformly distributed on the outer surface of the cutter head, and a chip groove which rotates rightwards towards the direction of a cutter handle is formed between every two adjacent circumferential blades. A plurality of chip breaker grooves are formed in each circumferential blade, and two end blades are arranged on the front end face; according to the high-performance milling cutter for machining the titanium alloy, the six right-handed chip removal grooves are adopted, the heat dissipation area is increased, and the cutter can smoothly remove chips and disperse cutting force during cutting, so that the cutting resistance is reduced, the heat dissipation efficiency is improved, stress concentration points are reduced, resonance is reduced, and the cutting stability is good; and the chip breaker grooves are uniformly formed in the circumferential blade, so that chips are cut off, the length of the chips is reduced, the chip removal efficiency is improved, the cutting resistance is reduced, the friction force is reduced, the cutting heat is reduced, the service life of the cutter is prolonged, and the cutting stability is further improved.

This invention discloses a semiconductor quartz component polishing device, relating to the field of quartz component polishing technology. The device includes a main body, inside which a polishing assembly and a rotating assembly coaxially arranged with the polishing assembly are installed. A mounting arm is mounted on the rotating end of the rotating assembly, and a ball head seat is mounted at the bottom of the mounting arm. A positioning assembly capable of vertical rotation is installed inside the ball head seat. Through the arrangement of the polishing assembly and the positioning assembly, the quartz rod is positioned, allowing the polishing assembly to first polish the end of the quartz rod. Then, combined with the cooperation of the rotating assembly and the electric push rod, the entire circumference of the quartz rod's end face can be uniformly and continuously contacted with the polishing assembly. This eliminates the need for manual polishing of the quartz rod by hand, efficiently chamfering the end of the quartz rod, eliminating quality fluctuations caused by inconsistent polishing force and path during manual polishing, effectively removing micro-cracks, scratches, and unevenness left from cutting, and reducing potential stress concentration points.

The invention belongs to the technical field of light building materials, and particularly relates to a preparation method of normal-temperature mixed asphalt concrete. The preparation method of the normal-temperature mixed asphalt concrete comprises the following steps: uniformly mixing 90-100 parts by weight of aggregate, 10-20 parts by weight of limestone mineral powder and 6-12 parts by weight of a fiber material at room temperature, then adding 2-4 parts by weight of a polycarboxylic acid water reducer and 1-5 parts by weight of water, stirring for 20-30 minutes, then adding 20-30 parts by weight of carboxylated cationic emulsified asphalt, and stirring at normal temperature to obtain a mixture; and pouring the mixture to obtain the normal-temperature mixed asphalt concrete. According to the invention, the dynamic stability is effectively improved while good splitting strength is ensured, and the method can be applied to light building materials.

The utility model provides a waterproof water gap structure, and belongs to the technical field of water tanks. The waterproof water gap structure comprises an annular body, the annular body is provided with an inserting end and a mounting end, the inserting end is provided with an anti-bending part, the anti-bending part penetrates into the water tank shell sleeving pipe connector and clamps the periphery of the pipe connector through the anti-bending part, the mounting end extends outwards in the circumferential direction to be provided with an abutting part, and the mounting part sleeves the end of the pipe connector and abuts against the water tank shell through the abutting part. By designing the waterproof structure with the inflection part, a gap between the waterproof structure and the water tank pipe joint is enlarged, installation personnel can more conveniently connect the pipe, meanwhile, the size error of the pipe joint can be compensated, and effective sealing between the waterproof structure and the pipe joint is ensured; by arranging the structures such as the arc-shaped abutting part, the drainage hole and the water blocking protruding block, water is guided to flow away towards the periphery of the waterproof structure, water is effectively prevented from entering the shell, and the situation that parts in the water tank are subjected to electrochemical corrosion, and consequently corrosion perforation is caused is avoided.

The utility model belongs to the technical field of switch panels, and particularly relates to a switch power supply panel with a reinforcing rib structure, which comprises a shell assembly, a switch assembly, a reinforcing assembly and a protection assembly, the switch assembly is arranged in the shell assembly, the reinforcing assembly is arranged in the shell assembly, and the protection assembly is arranged in the shell assembly. The protection assembly is arranged on the outer side of the shell assembly, through arrangement of the reinforcing frame, the reinforcing frame is used for protecting the outer frame of the switch assembly, meanwhile, the stability of the switch assembly during use after installation is improved through the limiting plate, and the reinforcing plate enables the shell assembly to be used for a long time, the rib height is properly increased so as to enhance the bending resistance, and the service life of the switch assembly is prolonged. According to the utility model, the structure is simple, the appearance of the shell assembly is not easy to deform, the shell assembly is provided with the installation groove for installing the reinforcing assembly, the reinforcing frame is connected with the shell assembly through bolts, stress concentration points at connection gaps are reduced, the reliability and strength of connection are improved, and the problems of accidental touch of a user and low strength are solved.

The utility model provides an auxiliary frame and a vehicle, and relates to the technical field of new energy automobiles, the auxiliary frame comprises an annular frame and a plurality of arc rings, the annular frame is provided with a first long shaft end and a second long shaft end, and the annular frame is provided with a first side and a second side which are oppositely arranged; the two ends of each arc ring are the first end and the second end respectively, the first end is arranged at the first long shaft end, the second end is arranged at the second long shaft end, each arc ring is divided into a plurality of arc upper rings and a plurality of arc lower rings, each arc upper ring is arranged on the first side, and each arc lower ring is arranged on the second side; the outer contour defined by the ring frame and the arc rings is in an ellipsoid shape, and an electric cavity is defined in the outer contour. The auxiliary frame has high structural strength and high rigidity, stress distribution is uniform when the auxiliary frame bears loads in multiple directions, and the auxiliary frame is high in deformation resistance and stability under complex working conditions.

This invention relates to the field of green special refractory ceramics technology, and particularly to a green refractory thermal shock resistant converter slag-blocking sliding plate and its preparation method. The raw materials for the aforementioned green refractory thermal shock resistant converter slag-blocking sliding plate, by weight, include: 50-80 parts of tabular corundum particles, 10-20 parts of fine tabular corundum powder, 1-3 parts of α-alumina micro powder, 5-10 parts of zirconium mullite, 5-10 parts of dispersed graphite, 1-2 parts of carbon fiber, 1-2 parts of silica micro powder, 1-2 parts of titanium powder, 1-5 parts of boron nitride, 1-5 parts of boron carbide, and 1-3 parts of phenolic resin; the raw materials for the dispersed graphite include: flake graphite powder, ferric nitrate, urea, potassium nitrate, and surfactant; the mass ratio of flake graphite powder, ferric nitrate, urea, potassium nitrate, and surfactant is 5-10:1-3:1-3:1-2:1-2. The thermal shock resistance, compressive strength, and high-temperature flexural strength of the converter slag-blocking sliding plate obtained by this invention are simultaneously improved.

This invention relates to the field of cable technology and proposes a water-blocking cable and its preparation method. A water-blocking cable comprises, from the inside out, a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a metal shielding layer, a water-blocking layer, and an outer sheath layer. The outer sheath layer comprises the following components by weight: 15-20 parts of tetrafluoroethylene rubber, 40-50 parts of chlorosulfonated polyethylene, 20-30 parts of ethylene-butyl acrylate copolymer, 20-30 parts of filler, 1-3 parts of vulcanizing agent, 0.5-1.5 parts of co-vulcanizing agent, and 4-6 parts of stabilizer; the chlorine content in the chlorosulfonated polyethylene is 26wt%-35wt%; and the butyl acrylate content in the ethylene-butyl acrylate copolymer is 27wt%-35wt%. This technical solution solves the problem of poor impact resistance of the outer sheath layer in existing water-blocking cables.

The application discloses a kind of high-performance glass fiber reinforced polypropylene composite material and preparation method thereof, it is related to high molecular composite material technical field;The application constructs the co-continuous gradient transition layer by polypropylene oligomer between glass fiber surface and polypropylene matrix, the polypropylene oligomer in the transition layer is gradually decreased in concentration in the direction from glass fiber surface to polypropylene matrix, concentration adjacent glass fiber surface is higher than adjacent polypropylene matrix concentration, so that there is no clear interface boundary between glass fiber and polypropylene matrix;The application passes through high concentration and low concentration polypropylene oligomer solution by layer gradient impregnation process in sequence by glass fiber, after drying, and polypropylene matrix is fused and is compounded so that gradient transition layer and matrix form molecular chain entanglement network, stress transmission mode is changed from jumping type to continuous type, and stress concentration point in traditional two-phase structure is eliminated.

The utility model provides a long -life papermaking forming net, it solved the problem such as forming net machine service life is limited, it includes main net body, main net body is connected with contact guide roller transmission, its characterized in that, contact guide roller and main net body between setting up tensioning assembly, and contact guide roller and main net body's contact site is provided with the washing assembly and is equipped with the protection structure of washing assembly. The utility model has long service life, stable structure and other advantages.

The utility model discloses a double-crest reinforced spiral corrugated pipe, and relates to the technical field of corrugated pipes. The double-wave-crest reinforced spiral corrugated pipe comprises at least two coaxially-connected annular corrugated cylinders, each annular corrugated cylinder comprises a pipe inner wall of a solid wall structure, two sets of second wave crests symmetrically arranged, first wave crests, a reinforcing structure and a protection structure, and the second wave crests are fixedly installed on the outer wall of the pipe inner wall; the first wave crest is fixedly installed on the outer wall of the pipe inner wall and located between the two sets of second wave crests, the first wave crest and the two sets of second wave crests are arranged at intervals and do not make contact with each other, the reinforcing structures are arranged on the inner walls of the second wave crests, and the protection structures are arranged on the inner wall of the pipe inner wall. According to the double-wave-crest reinforced spiral corrugated pipe, local deformation can be restrained, fracture caused by stress concentration can be avoided, meanwhile, bending deformation of the two sets of second wave crests in butt joint can be induced through the arrangement of the annular stress buffering grooves, stress can be smoothly dispersed, deformation can be guided, stress concentration points can be reduced, and fracture caused by stress concentration is further avoided.

The utility model relates to the technical field of cigarette manufacturing, in particular to a tobacco leaf kneading and pressing device which comprises a kneading and pressing part, a power part and a containing part used for containing tobacco leaves. The power part drives the kneading and pressing part to do reciprocating motion in the vertical direction so as to repeatedly knead and press the tobacco leaves in the containing part; tobacco leaves are kneaded and pressed for multiple times through the kneading and pressing part, the tobacco leaves can be tightly compressed, it is ensured that more tobacco leaves can be contained in the same storage space, and the tobacco leaf kneading and pressing efficiency and the warehouse utilization rate are effectively improved. In addition, the tobacco leaves can be compressed more evenly through multiple times of kneading and pressing, the internal structures of the tobacco leaves are gradually adjusted, it is guaranteed that the density of the tobacco leaves in all areas is consistent, the tobacco leaf quality is improved, and uneven internal pressure of the tobacco leaves caused by one-time excessive compaction is effectively avoided.

This invention discloses a photothermal multilayer film device with a dual-aperture structure, its fabrication method, and its applications, belonging to the fields of photothermal conversion devices and micro / nano fabrication technology. The device consists of an array of unit pixel structures, each a dual-aperture structure supported by silicon microbridges, with a pixel line spacing greater than 2 μm. From top to bottom, the unit pixel structure comprises an aluminum black film, a polyimide film, a silicon microbridge, and a silicon substrate, excluding a metal thermally conductive layer. The dual-aperture structure reduces etching stress concentration and improves fabrication success rate by increasing the line spacing; omitting the metal thermally conductive layer allows heat to be retained in the upper film, enhancing infrared emission performance. This device can achieve a 3200×3200 pixel array on a 4-inch silicon wafer, with a photothermal conversion efficiency of 16.32%. This invention solves the problems of low yield and complex structure in existing photothermal thin-film devices, and can be used for infrared scene generation, infrared imaging, and infrared decision-making training for autonomous driving.

The invention discloses a high-reliability silver-copper-titanium AMB solder and a preparation method thereof, and belongs to the technical field of electronic welding materials. The solder is composed of silver powder, copper powder, titanium powder, an organic binder and an organic diluent, wherein the organic binder is prepared from acrylic resin and a specific organic solvent. The key point of the preparation method is that the silver powder, the copper powder, the organic binder and the organic diluent are finely mixed and dispersed through a specific multi-stage gradient rolling process; and then, under the condition that the roller gap is adjusted to be large, titanium powder is slowly added in batches and mixed, so that the activity of the titanium powder is prevented from being damaged in violent processing. The solder paste prepared by the method is uniform and stable in performance. When the AMB solder is applied to brazing of an aluminum nitride ceramic substrate, reliable welding spots low in interface porosity, high in bonding strength and excellent in temperature cycle resistance can be formed, and the problems that an existing AMB solder is large in number of pores, poor in strength and insufficient in reliability are effectively solved.

The utility model provides a kind of base glue gradual change's tread mouth plate, it solves the problem that current tread mouth plate is small in application range and low in production efficiency in base glue extrusion forming process. Including pre mouth plate and the mouth plate main body closely matched with it, mouth plate main body includes detachably connected upper plate and lower plate;The side of lower plate top close to pre mouth plate is equipped with sliding slot along the length direction of lower plate, two symmetrical glue baffle of sliding connection are in sliding slot, and the top of glue baffle is flush with lower plate top;The opposite side of two glue baffles and the bottom surface of sliding slot are enclosed to form base glue runner, and the inside of glue baffle is equipped with inclined gradual change edge;The side of upper plate bottom close to front end is equipped with glue outlet, and base glue runner end communicates with glue outlet. The utility model is widely applied in semi-steel tire processing equipment technical field.

This utility model relates to the field of joint connections and discloses a lower joint of a connection mechanism. The lower joint includes a connecting cylinder, a fork-shaped wing, and reinforcing ribs. The connecting cylinder is fixed to the top of the fork-shaped wing and is used to connect with a lifting rod. The fork-shaped wing is used to connect with a crossbeam. The reinforcing ribs longitudinally span across the connecting cylinder and the fork-shaped wing. Reinforcing ribs are provided on both sides of the lower joint and are symmetrical to each other. This component adopts a one-piece milling forming process. Its symmetrical reinforcing rib design optimizes the force flow path and significantly reduces stress concentration between the connecting cylinder and the fork-shaped wing. At the same time, the milling process eliminates defects such as internal porosity and shrinkage, thereby comprehensively improving fatigue resistance and service life.