10results about How to "Reduce stress concentration points" patented technology

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 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 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 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.

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.