31results about How to "Overcome the disadvantage of low strength" patented technology

The invention discloses a method for preparing high-strength semi-regenerative coarse aggregate concretes, and belongs to the technical field of regenerative coarse aggregate concretes. The preparation method comprises the step of preparing the high-performance semi-regenerative coarse aggregate concretes with good working performance, high early strength and good development in long-term strength by regulating the mixing amount of additives, mineral powder and coal ash in reference to the using amount of rubber materials of the common concretes.

The invention discloses a rock coarse fracture seepage simulation model and a making method. The rock coarse fracture seepage simulation model comprises a fracture main board, a left mounting board, a right mounting board, an upper mounting board and a lower mounting board, the fracture main board is of a cuboid structure, a hydrophobic area is arranged on one side of the cuboid structure, a water gathering area is arranged on the other opposite side, the hydrophobic area is communicated with the water gathering area, the outer side of the hydrophobic area is matched with the left mounting board, and the outer side of the water gathering area is matched with the right mounting board; the upper surface and the lower surface of the cuboid structure are respectively matched with the upper mounting board and the lower mounting board, and a pressure measuring hole communicated with a communicating area between the hydrophobic area and the water gathering area is formed in the upper mounting board. 3D printing technology is adopted to manufacture the fracture main board which is fixed through the upper, lower, left and right mounting boards, and a bolt or a water pressure sensor is mounted on each mounting board, so that the making method of the rock coarse fracture seepage simulation model is simple to make, convenient to experiment and capable of reflecting rock fracture seepage characteristics more really and more accurately.

The invention relates to a nanostructured pure titanium plate preparation method which includes the following phases: (1) selection of titanium powder particles, to be more specific, low oxygen and low hydrogen high purity titanium powder particles are selected, and the titanium powder particle size distribution range is 5-200 microns; (2) preparation of a pure titanium plate blank by high speed spray deposition method, to be more specific, titanium powder particles are accelerated, by collision of the high speed titanium powder particles and a substrate, a pure titanium plate blank is prepared by deposition caused by strong plastic deformation of the titanium powder particles; (3) plate blank heat treatment, to be more specific, and heat treatment of the prepared pure titanium plate blank is performed; and (4) hot rolling. The crystalline grain size of the pure titanium plate prepared by the method is small, the crystalline grain is nanocrystalline, uniform in organization, and excellent in performance, the shortcoming of low strength of the pure titanium plate is overcome, the hardness is 2 times greater than that of ordinary pure titanium plates, at the same time, the advantages of excellent corrosion resistance, heat resistance and biocompatibility and the like of the ordinary pure titanium plates are inherited. The nanostructured pure titanium plate preparation method is simple in process, good in controllability, and high in production efficiency, and helps to industrial application.

The invention relates to a compact siro spinning dacron viscose high-count yarn and a production method thereof, belonging to the field of textile processing. The invention aims at providing a compact siro spinning dacron viscose high-count yarn and a production method thereof, which overcome the bad problems that the traditional ring spun yarn feathers are more, the strength is low and the like. By adopting dacron fibers and viscose fibers as raw materials, the product has higher strength and fewer feathers, and the product has finer, softer and more comfortable characteristics. By adopting the method, the problems that the feathers of the traditional ring spun yarn are more, the strength is low, and the like can be overcome, in addition, by adopting dacron fibers and viscose fibers as raw materials, the product has higher strength and fewer feathers, and the product has finer, softer and more comfortable characteristics, and the compact siro spinning dacron viscose high-count yarn is more suitable for producing underwear and high-grade clothes on a water-jet loom.

The invention discloses a high-performance glass fiber composite baseball bat. The composite baseball bat is prepared from, by weight, 15-30 parts of modified bamboo fibers, 20-40 parts of glass fibers, 20-50 parts of polypropylene, 1-4 parts of isobutyl triethoxy silane, 20-40 parts of maleic anhydride grafted polypropylene, 1-10 parts of epoxy resin, 1-6 parts of an antioxidant and 10-20 parts of filler. The invention further discloses a manufacturing method for the high-performance glass fiber composite baseball bat. The baseball bat is high in strength and toughness, long in service life, simple in manufacturing process and easy to operate.

The invention provides a polypropylene non-woven fabric and a making method of the polypropylene non-woven fabric. The molecular weight distribution index of polypropylene in the polypropylene non-woven fabric is 2.5-5.5, and the high molecular trailing index PIHT in molecular weight distribution width is greater than 1.9. The polypropylene non-woven fabric has high strength.

The invention relates to a hogging moment rebar suspension construction control protection layer device and a construction method thereof. The device comprises tripod supporting bases, a horizontal fixing beam and a fixation binding line. The method includes the following steps that firstly, the thickness of a cast-in-place concrete plate is determined; secondly, the position and the use number of tripod supporting bases are determined and the tripod supporting bases are manufactured in batches; thirdly, the tripod supporting bases are placed in the middle of adjacent hogging moment rebar; fourthly, the horizontal fixing beam is arranged on the tripod supporting bases in an erected mode; fifthly, the hogging moment rebar is suspended on the horizontal fixing beam through the fixing binding line to be bound and fixed; sixthly, the surface of concrete on the lower portion of the horizontal fixing beam after casting is floated; seventhly, after concrete reaches the design strength, the upper portion horizontal fixing beam is detached. Compared with the prior art, the hogging moment rebar suspension construction control protection layer device and the construction method of the hogging moment rebar suspension construction control protection layer device have the advantages that the structure is simple and light, the device is convenient to use and low in investment cost and the situation that the position of the stressed rebar in a concrete structure is accurate and the thickness of the hogging moment rebar protection layer conforms to the requirements is effectively ensured.

The invention provides a fragrant ceramic decorative plate and a preparation method thereof. The fragrant ceramic decorative plate is obtained by infiltrating a solid fragrant substance into a porousceramic plate through a melt impregnation process; and the porous ceramic plate is prepared from kaolin, calcined bauxite, a mineralizing agent, a sintering aid and a reinforcing agent. The preparation method of the fragrant ceramic decorative plate comprises the steps of ball milling, spray drying, compression molding, first firing, ink-jet printing and glazing, second firing, fragrance infiltration and surface treatment. The high-strength and high-porosity ceramic plate is prepared under the condition of no pore-forming agent by virtue of the enhancement effect of in-situ synthesized mullitewhiskers, a storage carrier with excellent performance is provided for fragrance substances, and the defect of low strength of a traditional fragrance ceramic carrier is overcome; and solid fragrancesubstances are infiltrated and surface treatment is performed through melt impregnation operation, so that a large amount of fragrance can be stored and slowly released, and lasting release of the fragrance is guaranteed.

The invention discloses a steel slag-based pervious concrete. The concrete comprises, by weight, 100 parts of steel slag, 15-30 parts of phosphate, 1-5 parts of a retarder and 50-150 parts of steel slag aggregate. When in use, the concrete materials are uniformly stirred and mixed with water, the obtained mixture is formed and naturally cured. The concrete has the excellent properties of high early strength, high low-temperature setting speed, small volume deformation, wide environmental adaptability, good water permeability and the like; and the defect that traditional pervious concrete is low in strength is overcome, meanwhile, a large amount of waste steel slag can be effectively treated, energy conservation, consumption reduction and emission reduction are achieved, and certain environmental protection and economic benefits are achieved.

The invention provides pervious concrete and a preparation method thereof. The pervious concrete is prepared from, in parts by weight, 200-300 parts of cement, 30-80 parts of mineral powder, 30-80 parts of fly ash, 1400-1700 parts of gravel, 1-5 parts of rubber powder, 0.5-5 parts of cellulose and cellulose ether, 0.5-5 parts of starch ether, 3-4 parts of an additive and 57-84 parts of water. The raw materials used in the pervious concrete are common and easy to obtain, the production process is simple, and cellulose/cellulose ether and starch ether are added as thickening and water-retaining agents, so that the produced pervious concrete is suitable for long-distance transportation, high-strength pervious concrete can be prepared while good pervious rate is met, and the pervious concrete is suitable for production of common commercial concrete mixing plants.

The invention discloses an internal spiral heat exchanger. The heat exchanger comprises an upper cover, a base and middle sections connected between the upper cover and the base, each middle section comprises an inner pipe and an outer sleeve, the upper cover and the base are provided with elbows with openings formed in the plate face of the upper cover and the plate face of the base, annular grooves are formed in the plate face of the upper cover and the plate face of the base and surround the opening portions of the elbows, openings in the two ends of the elbows are connected with the inner pipes of the adjacent middle section, interlayers are formed among the outer sleeves, the inner pipes and the annular grooves, communicating cavities are formed in the upper cover and the base to enable the two adjacent interlayers close to the elbows to communicate, the upper cover and the base are formed through metal injection molding, first threaded ribs are arranged on the inner wall face of the inner pipes, the thread pitch L1 of the first threaded ribs meets the condition that L1 is smaller than 0.028 Re*D1, Reynolds number Re=, v is the average flow velocity of fluid on the inner walls of the inner pipes, D1 is the diameter of the inner walls of the inner pipes, and mu is the current kinematic viscosity coefficient of the fluid on the inner walls of the inner pipes. A roundabout heat exchange structure with a long route is formed in the heat exchanger, and sufficient heat exchange between a refrigerant and a secondary refrigerant can be achieved.

The invention discloses a heat exchanger of a spring rib structure. The heat exchanger comprises a first end cover and a second end cover and further comprises a heat exchange sleeve, the heat exchange sleeve comprises inner pipes and outer sleeves, the first end cover and the second end cover are provided with bottom plates, an elbow and a communicating groove are integrally formed in each bottom plate in a metal injection mode, the two ends of the elbows are opened in the bottom plates, the communicating grooves are formed in the plate wall portions, connected with the two opening portions of the elbows, of the bottom plates, the openings in the two ends of the elbows are connected with inner pipes of the two adjacent heat exchange sleeves, outer sleeve interlayers of the two adjacent heat exchange sleeves connected with the elbows communicate through the communicating grooves, and therefore, two independent heat exchange runners are formed between the first end cover and the heat exchange sleeves and between the second end cover and the heat exchange sleeves. According to the heat exchanger, the metal injection molding technology is applied, the reasonable and mature brazing welding technology is additionally adopted, integral forming of s bent pipe and a sleeve can be achieved in a simple and effective mode, a spring is installed in a pipe body, the screw pitch L of the spring meets the condition that L is smaller than 50*D, so that additional heat resistance is reduced, and the heat exchange effect is better.