19results about How to "Low structural stability" patented technology

The invention relates to a negative electrode material and a preparation method thereof, and a lithium ion battery, the negative electrode material comprises a porous carbonaceous material and a silicon material, the negative electrode material has a first region located in the central region in the porous carbonaceous material, a second region distributed on the surface of the first region, and a third region distributed on the surface of the second region, the porous carbonaceous material located in the first area has first pores, the porous carbonaceous material located in the second area has second pores, the porous carbonaceous material located in the third area has third pores, at least part of the first pores are communicated with the second pores, at least part of the second pores are communicated with the third pores, and the third pores are communicated with the third pores. At least part of the third pores are communicated with the surface of the negative electrode material, the silicon material is distributed in at least one of the first pores, the second pores and the third pores, the pore diameter of the first pores is 0.1-2.2 nm, the pore diameter of the second pores is 1.8-5 nm, the pore diameter of the third pores is 3-60 nm, and the probability entropy H of the pores in the porous carbonaceous material meets 0.96 gt; hgt; and 0.70%.

The invention relates to the technical field of positive electrode materials, and particularly discloses a preparation method and application of a modified lithium cobalt oxide positive electrode material. The preparation method comprises the following steps: S1, preparing modified graphene by taking polyvinyl alcohol modified porous graphene, phosphatic acid, 5-boracolinic acid, zinc sulfate and carboxymethyl chitosan as raw materials; s2, adding carboxymethyl chitosan into water, stirring and dissolving, adding the modified graphene, and uniformly mixing to obtain a modified solution; spraying the modified liquid on the surface of lithium cobalt oxide, and drying to obtain a modified lithium cobalt oxide positive electrode material; the modified graphene is prepared from the following raw materials in parts by mass: 10 to 12 parts of polyvinyl alcohol modified porous graphene, 2.5 to 4 parts of phosphatic acid, 2 to 3 parts of 5-boron pyridine carboxylic acid and 3 to 4 parts of carboxymethyl chitosan; the modified liquid is prepared from the following raw materials in parts by mass: 3 to 5 parts of carboxymethyl chitosan, 120 to 150 parts of water and 0.6 to 1 part of modified graphene.

The utility model relates to the technical field of biomimetic robots, in particular to a tensegrity biomimetic robot which comprises a first pressing rod, a second pressing rod, a third pressing rod, a fourth pressing rod, a fifth pressing rod, a sixth pressing rod, a plurality of drivers and a controller, the controller is located in the middle of a geometry formed by the pressing rods and electrically connected with the drivers, and inhaul cable assemblies are further installed between the drivers. According to the bionic robot, various forms can be changed, and the adaptability of the bionic robot is improved.

A telescopic storage box of the present invention is characterized in that: the storage box body is rectangular, includes side panels, a bottom panel and a top cover, the top cover is detachably rotatably connected to the top of one of the side panels, the side panels, the bottom panel and the top cover all include two groups of telescopic plate components symmetrically arranged inside and outside, the two ends of the telescopic plate components located on the inside are provided with clamping grooves, and the two ends of the telescopic plate components located on the outside are provided with outer sliding cavities matching the clamping grooves, the telescopic plate assembly includes a telescopic main board and a telescopic sub-board, the telescopic sub-board is provided with a guide groove and a positioning groove, the telescopic main board is provided with an inner sliding cavity matching the guide groove and the positioning groove, a longitudinal locking mechanism is provided between two adjacent side panels, and a transverse locking mechanism is provided on the side panels, which can freely perform telescopic deformation in three directions to change the volume that can be stored, and can be shaped by the locking mechanism after telescoping.

A COFs nano / BD resin composite material and its preparation method and application, the method comprising: uniformly mixing COFs nano material and allyl compound under ultrasonic action, then adding bismaleimide and mechanically stirring at 135°C to 145°C to obtain a prepolymer of a transparent solution; and heating and curing the prepolymer at 140°C to 250°C to obtain a COFs nano / BD resin composite material. The pore size of the COFs nano material provided by the present invention is 0.5nm to 0.67nm. Compared with metal organic frameworks, the crystalline COFs based on covalent bond connection have better structural stability and smaller pore size, which can not only reduce the possibility of structural collapse of COFs during high temperature curing, but also provide BD resin with excellent mechanical strength and thermal stability, so that it can maintain its performance stability even in long-term use or harsh environment, and its smaller pores can reduce the absorption and scattering of electromagnetic waves by the material, while improving the material's screening ability for ions or molecules.

The utility model provides an integral bridge type suspension and a vehicle. The integral bridge type suspension comprises an integral bridge and a steel plate spring installed on a steering knuckle in the integral bridge. The steering knuckle is provided with a steering knuckle main body and an axle body connecting part connected with an axle body in the integral axle, and the steering knuckle main body comprises an upper wall and a lower wall which are oppositely arranged up and down, and a side wall connected between the upper wall and the lower wall; the axle body connecting part is connected between the upper wall and the lower wall, a hub bearing mounting part is arranged on the side wall, a cavity for a driving half shaft to pass through is formed between the upper wall and the lower wall, and the steel plate spring is mounted at the bottom of the lower wall through a mounting structure. According to the integral bridge type suspension, the installation and arrangement of the steel plate spring on the axle can be realized under the condition that the suspension driving half shaft is separated from the axle housing, and the arrangement requirement of the steel plate spring in the integral bridge type suspension can be met.

The invention discloses a method for extracting white carbon black from shale vanadium extraction tailings. The method comprises the following steps: (1) crushing and screening the shale vanadium extraction tailings to obtain tailings powder; (2) uniformly mixing the tailing powder with a roasting additive, and then carrying out roasting treatment to obtain a roasted material; the roasting additive is prepared from alkali, CH3COONa and NaF; (3) leaching the roasted material, and carrying out solid-liquid separation to obtain a silicon-containing leachate; and (4) carrying out silicon precipitation, filtering, washing and drying treatment on the silicon-containing leachate to obtain the white carbon black. According to the method for extracting the white carbon black from the shale vanadium extraction tailings, the adopted roasting additives comprise the alkali, the CH3COONa and the NaF, and the alkali, the CH3COONa and the NaF have a synergistic effect, so that leaching of silicon dioxide in the shale vanadium extraction tailings can be promoted, leaching of impurities is reduced, the leaching rate of the silicon dioxide can be increased, and a high-dispersity and high-purity white carbon black product can be obtained.

The utility model belongs to the technical field of vehicle frame tools, and particularly relates to a vehicle frame tool assembling structure and a vehicle frame tool used for assembling a double-wishbone suspension, the vehicle frame tool assembling structure comprises a bottom plate and a plurality of positioning pieces used for positioning and supporting different parts of a vehicle frame, the bottoms of the positioning pieces are all arranged on the bottom plate and matched with the bottom plate in an inserted mode, and the positioning pieces are arranged on the bottom plate. And in the plurality of positioning pieces, adjacent positioning pieces forming an angle are inserted and matched in the transverse direction and / or the vertical direction. According to the utility model, the frame assembly link can be simplified, the skill requirement on a welding technician is reduced, and the assembly precision of the frame tool is improved, so that the assembly precision when the frame tool is used for frame assembly in the later period is improved, the welding time can be reduced, and the manufacturing period is shortened. And the position precision of the positioning pieces on the frame tool during assembly is achieved, the structural stability between the positioning pieces is improved, the deformation degree of the frame tool in the long time is reduced, and the precision of the frame tool in the long-time use process is guaranteed.

The invention belongs to the technical field of lithium ion batteries, and relates to a high-nickel positive electrode material of a lithium ion battery as well as a preparation method and application thereof. The preparation method comprises the steps that raw materials are mixed and then subjected to at least two times of sintering and one time of coating treatment, the raw materials are subjected to three times of sintering, the coating treatment is carried out before the third time of sintering, the temperature of the first time of sintering is 700-900 DEG C, and the raw materials comprise a Li source, a metal A source and a nickel-manganese hydroxide precursor. The prepared high-nickel positive electrode material of the lithium ion battery has relatively good cycle performance and relatively high capacity, and meanwhile, the increase of impedance in the cycle process of the battery is relatively small.

This utility model provides a suspension arm assembly, belonging to the field of automotive parts technology. It solves the problem of insufficient structural stability in existing suspension arm assemblies when reducing weight. This suspension arm assembly includes an arm body, a ball joint assembly, and a bushing assembly. The arm body includes a V-shaped main body, end rings at both ends of the main body, and a central cylinder in the middle of the main body. The end rings are fixedly connected to the bushing assembly, and the central cylinder is fixedly connected to the ball joint assembly. The main body is flat and strip-shaped. Both the front and back of the main body have quadrilateral, closed-sided weight-reduction grooves. The length of the weight-reduction grooves is along the length direction of the main body. The weight-reduction grooves on the front and back of the main body have the same shape and corresponding positions. Both the front and back of the main body have two weight-reduction grooves located on either side of the central cylinder. One end of the weight-reduction groove is spaced apart from the central cylinder, and the other end of the weight-reduction groove is spaced apart from the corresponding end ring. This suspension arm assembly can reduce weight while maintaining structural stability.

This invention discloses a salmon protamine preservative, its preparation process, and its application, relating to the field of food preservation technology. The process includes: preparing a salmon protamine solution with a mass concentration of 2-5%; preparing a sodium alginate solution with a mass concentration of 1-3%; mixing the salmon protamine solution and sodium alginate solution at a volume ratio of 1:1 to 1:3 to obtain a mixed solution; adding the mixed solution dropwise to a calcium chloride solution with a mass concentration of 2-4% to form gel microspheres; solidifying the microspheres in the calcium chloride solution and filtering to obtain the gel microspheres; immersing the washed gel microspheres in a chitosan solution with a mass concentration of 0.5-1.5%; and freeze-drying the obtained gel microspheres to obtain the final product. This invention achieves efficient encapsulation and long-term sustained release of salmon protamine, enhances the structural stability of microspheres in acidic environments, prevents premature leakage of active ingredients, exhibits broad-spectrum antibacterial activity, extends food shelf life, and is characterized by a mild, environmentally friendly process that facilitates storage and transportation.

The utility model provides a sheet material forming tool for manufacturing corrugated sheet, including upper tool assembly and lower tool assembly, upper tool assembly and lower tool assembly include base and a plurality of finger elements respectively, a plurality of upper finger elements and a plurality of lower finger elements are inserted in upper base and lower base along the feeding direction, interval, upper finger elements and lower finger elements are opposite, set alternately, are used for stamping sheet material to form the corrugation of corrugated sheet, the inner wall surface of upper base and lower base is abutted on the side wall of upper finger elements and lower finger elements respectively. The sheet material forming tool will be subject to wear forming element and fixed element split body manufacture, only need to replace the damaged finger element, and do not need to replace the whole sheet material forming tool, thereby shorten the replacement time, improve production efficiency, also save the replacement cost. And the cooperation structure of finger element and base is simple, avoids stress concentration, reduces the probability of damage.

The invention relates to the technical field of stamping, in particular to a backboard reinforcing rib production process and a backboard, and the process comprises the following steps: designing a reinforcing rib at a micro rib position to replace an original reinforcing rib on the backboard; a bottom punch and a top cavity are arranged in the stamping die, the bottom punch and the top cavity are matched with each other, and convex hull forming is carried out on the reinforcing rib during stamping; wherein during convex hull forming, the bottom punch and the top cavity extrude materials at the R corners at the two ends of the reinforcing rib. The micro-rib position reinforcing ribs are used for replacing traditional large-size reinforcing ribs to reduce the thickness of the back plate and improve the flatness, and R-angle areas at the two ends of the reinforcing ribs are extruded, so that the rib position strength is remarkably improved, the structural stability of the back plate under the thinning condition is ensured, the stretching amplitude of rib position materials is reduced, and the phenomenon that the rib positions are prone to tension cracks is avoided; and the surface of the back plate is smoother, automatic production can be carried out by adopting a universal sponge sucker, the step of designing a special sucker is omitted, and the production cost is reduced.

The invention relates to a motor fixing structure of a two-stage axial flow fan, which is a cylindrical motor fixing structure, is arranged at the central axis position in a fan shell and is provided with a motor fixing cylinder body, and a plurality of cylinder body inner wall boss surfaces are arranged in the motor fixing cylinder body. And the motor fixing cylinder is in matched positioning connection with the motor fixing surface of the motor shell through the boss surface on the inner wall of the cylinder, and is fixed by a bolt assembly. The problems that a motor of the two-stage axial flow fan is difficult to disassemble, the maintenance space is small, and the replacement cost is high are solved. A cylindrical motor fixing structure is adopted, the overall structural stability is high, the influence on the aerodynamic performance of the fan is small, the heat dissipation requirement of the motor is met, the special space requirement of ship maintenance is better met, and conditions are provided for efficiently solving the problem of ship ventilation equipment maintenance.

The application discloses a titanium-doped silicon-carbon negative electrode material and a preparation method thereof. The preparation method comprises the following steps: S100, mixing a carbon source, a titanium source and a pore-forming agent in water to obtain a first product containing titanium oxide through freeze-drying; S200, calcining the first product in a reducing gas to obtain Ti4O7-doped porous carbon; and S300, performing gas-phase deposition of a silane gas source and a carbon gas source on the outer surface and pores of the Ti4O7-doped porous carbon in an inert gas to obtain a silicon-carbon negative electrode material. The carbon source, the titanium source and the pore-forming agent are mixed in water to generate titanium oxide, and the titanium oxide is calcined by using a reducing gas, so that the titanium oxide is reduced into Ti4O7 with metallic conductivity and high catalytic activity, and the electron transmission is fast and the structure is stable. The silane gas source and the carbon gas source are gas-phase deposited on the Ti4O7-doped porous carbon to generate silicon-carbon active substances in situ, and the structural stability and the conductivity are improved.

The invention relates to the technical field of steel rail flaw detection, in particular to a steel rail flaw detection and multifunctional detection railcar which comprises a heat preservation mechanism and flaw detection mechanisms, the flaw detection mechanisms are arranged on the two sides of the heat preservation mechanism, the heat preservation mechanism comprises a moving assembly, a water supply assembly, a flow guide assembly and a heating assembly, and the water supply assembly is arranged on the front side of the top of the moving assembly; the flow guide assemblies are arranged on the two sides of the front side of the water supply assembly, the heating assemblies are arranged on the two sides of the water supply assembly, the flaw detection mechanism comprises guide assemblies, deicing assemblies, coupling assemblies, adapting assemblies and adjusting assemblies, the guide assemblies are arranged on the front sides of the two sides of the flow guide assemblies, and the deicing assemblies are arranged at the bottom of the flaw detection mechanism. The steel rail flaw detection and multifunctional detection rail car is provided with a structure for continuously preserving heat of flaw detection equipment, so that failure of the flaw detection equipment due to low temperature is avoided, and the stability of the flaw detection equipment during steel rail detection is improved.

The invention discloses a calcium silicate board powder coating and a preparation method thereof, and belongs to the field of coatings. The calcium silicate board powder coating is prepared from the following raw materials in percentage by weight: 55-70% of low-temperature curing polyester resin; 5-8% of a curing agent; 0.5%-1.5% of a wetting agent; 0.5 to 1.5 percent of a flatting agent; 0.5 to 1.5 percent of a filling agent; 5-10% of a flame retardant; 0.6-1% of a modified degassing agent; the balance of pigment and filler; the modified degassing agent is prepared from unsaturated polyoxyethylene ether grafted polytetrafluoroethylene wax. The powder coating has the effect of improving the adhesive force and smoothness of the powder coating on the calcium silicate board.

The application belongs to the technical field of high-voltage electrolyte of lithium metal battery, and specifically discloses a high-voltage electrolyte for lithium battery and application thereof. The electrolyte comprises lithium salt, organic solvent and additive. The lithium salt comprises lithium hexafluorophosphate and lithium diboronic acid; the organic solvent is composed of ethylene carbonate, dimethyl carbonate and diethyl carbonate; and the additive is 2-cyano-4-methoxyphenylboronic acid. The application also discloses a lithium metal battery comprising the electrolyte. By adopting mixed lithium salt with a specific proportion, mixed solvent and adding a specific amount of 2-cyano-4-methoxyphenylboronic acid additive, the synergistic effect of each component makes the electrolyte have excellent stability at high voltage, can form a stable and low-impedance interface film on the surface of the positive and negative electrodes, effectively inhibits the structural degradation and interface side reaction of the lithium cobaltate positive electrode, protects the lithium metal negative electrode, and significantly improves the cycle life of the lithium metal battery at high voltage.

The utility model belongs to the technical field of medical instruments, and discloses an external locking type catheter fixing device which comprises a fixing part and a rotating part, a strake is arranged between the fixing part and the rotating part, and the middle of the strake keeps horizontally bent in the radial direction under the action of elasticity of the strake. A locking mechanism is arranged between the fixed part and the rotating part; a convex-concave structure is arranged on the circumferential surface of the rotating part, a spring piece is arranged on the fixed part, the spring piece abuts against the circumferential surface of the rotating part under the elastic effect, the spring piece is provided with a matching structure interacting with the convex-concave structure, and the spring piece and the convex-concave structure are combined to form the locking mechanism. The locking mechanism adopted by the utility model is not provided with an independent part and does not need to be additionally assembled, and when the rotating part is mounted on the fixed part, only the leaf spring needs to be moved to avoid the rotating part, so that the rotating part is more convenient to mount.