116 results about "Square mesh" patented technology

The invention provides a device and a method for testing a forming limit of a sheet material in a three-dimensional stress state, relating to the device and the method which are used for testing the forming limit of the sheet material. Aiming to the problems that the forming limit of the sheet material in the three-dimensional stress state is difficult to test and an influence of normal pressure to the forming limit is difficult to estimate, the device comprises an upper die and a lower die. In a test, a fluid medium is injected into the lower die, a test sample of the sheet material is placed, mold clamping force is applied, the fluid medium is injected into the upper die, and pressurized deformation is carried out by controlling pressure in the upper die and the lower die in sequence. Braking strains of the test sample of the metal sheet material can be calculated according to measured data before and after circular or square mesh deformation, namely epsilon 1=Ln[d1-d/d] and epsilon 2=Ln[d-d2/d]; a plurality of groups of different limit strain data points can be obtained by changing a ratio of a long shaft to a short shaft of an oval cross section of a cavity; and the obtained data points can be connected or fitted by respectively using the epsilon 1 and the epsilon 2 as a transverse coordinate and a vertical coordinate, so as to obtain the sheet material forming limit curve at the three-dimensional stress state at a certain normal pressure condition to estimate the influence of the normal strain to the forming limit in the three-dimensional stress state.

The invention relates to a wind farm multi-model draught fan optimized arrangement method based on a genetic algorithm. The method includes the following steps that (1) a wind farm region is divided into square meshes which are the same in size according to the diameter of a draught fan, and an integer matrix which is the same in line and row is generated randomly to be used as the initial solution of the algorithm; (2) the individual fitness value of a current generation is calculated; (3) parent individuals participating in crossover are selected through even random selection operators, and then filial generation individuals are generated by the adoption of improved crossover and mutation operators; (4) repairing operators are introduced to the individuals in a population; (5) a Tabu operator is introduced to an optimal solution of the current generation of the population, the optimal solution is used as the initial solution of a Tabu algorithm, and the neighborhood solution of the optimal solution is searched for; (6) whether the biggest number of iterations is reached or not is judged, if yes, the multi-model draught fan optimized arrangement is completed, and if not, the step (2) is executed again. Compared with the prior art, the wind farm multi-model draught fan optimized arrangement method based on the genetic algorithm has the advantages of being visual in coding mode, good in performance index, high in local search capacity, high in expansibility, high in practicability and the like.

The invention relates to a granite powder composite mineral admixture and a preparation method therefor. The admixture contains raw materials, i.e., modified granite powder, modified pulverized coal ash, slag and a reinforced activator, wherein the mass content of the former three kinds of raw materials is as follows: the mass content of the modified granite powder is 40 to 70 parts, the mass content of the modified pulverized coal ash is 10 to 25 parts, the mass content of the slag is 15 to 35 parts, the sum of mass contents of the three kinds of raw materials is 100 parts, and the mass of the reinforced activator accounts for 0.1% to 0.3% the total mass of the former three kinds of raw materials. The preparation method comprises the steps: proportionally weighing the raw materials, i.e., the modified granite powder, the modified pulverized coal ash, the slag and the reinforced activator, mixing the raw materials, then, putting the mixture into a ball mill, carrying out milling until the screening volume of a square-mesh screen with the pore size of 45 microns is lower than 10%, baking the obtained screen underflow, and carrying out cooling, thereby obtaining the granite powder composite mineral admixture. According to the scheme of the invention, the activity of the granite powder is enhanced, the utilization ratio of the granite powder is increased, and thus the economic and social benefits are very good.

The invention discloses a rough surface-based three-dimensional contact stiffness calculation method for a spur gear. The method comprises the steps of firstly by adopting hexahedral mesh generation, requiring all square meshes on a tooth surface to be equal in area; calculating contact pressure distribution of the smooth tooth surface based on a finite element method, and extracting node pressure intensity of a contact region; calculating normal contact stiffness and tangential contact stiffness of a single square mesh based on a fractal theory; and calculating the contact stiffness of the tooth surface. According to the method, the precision of a gear contact stiffness calculation model is further improved; the defect of smooth contact according to a Hertz theory in an original calculation process is overcome; an influence law of a roughness parameter on a gear stiffness characteristic in a rough tooth surface contact process and a calculation method are disclosed; and meanwhile, a finite element-based three-dimensional contact stiffness calculation model is more accurate than an original two-dimensional calculation model or calculation formula, and the influence of errors in actual assembling and manufacturing processes of the gear is considered, so that the gear contact stiffness is more accurate and a foundation is laid for gear dynamics analysis.

The invention relates to a manufacturing method for a flowered nickel screen die roll. The technical process comprises the following steps: machining, copper plating, grinding, glue coating, pattern fabrication, laser engraving, corrosion, rubber filling and nickel plating. The preparation method is characterized in that: the pattern fabrication process comprises the following steps: applying a 70 mesh screen to a needed pattern grey scale file to obtain square mesh points with various sizes and directly form a pattern; eliminating screen pattern information loss caused by screen wires of a common nickel screen; synthetically sorting a grey chart file, the laser engraving expansion, the corrosion expansion and the die roll nickel plated screen expansion to form a laser engraved file which is represented by grey scale values from 0 to 100; and adopting a file with the grey scale value above 98 to fabricate a minimal screen wall, and adopting a file with the grey scale value below 3 to fabricate a maximal screen wall. The method adopts the grey chart and the screen with the same meshes and different mesh sizes to form the pattern, and directly fabricates the pattern on the die roll of a nickel plated circular screen. The electroplated nickel circular screen is directly used for printing without pattern information loss, and has rich gradual change gradations.

A high-performance superfine sand concrete cementitious material with waste stone powder and an application method thereof pertain to the field of construction materials. The method comprises the following steps: firstly, the waste stone powder is dried and sieved by a 200-mesh sieve, the sieved part and original particles of the water quenched blast furnace slag are mixed and ground to not more than 5% screen residue of 0.045mm square mesh sieve, wherein, the weight percentage of the waste stone powder is 30-40% and the weight percentage of the water quenched blast furnace slag is 70-60%; the water quenched blast furnace slag, mixed fine powder of the waste stone powder, original particles of cement clinker, a water reducing agent or a pumping agent are mixed and ground to not more than 5% screen residue of 0.045mm square mesh sieve according to a certain proportion, the powder obtained is the high-performance superfine sand concrete cementitious material. The cementitious material obtained, superfine sand and coarse aggregate are mixed to obtain the high-performance superfine sand concrete with good working performance, low dry shrinkage, no crack, high strength and good lasting quality. The material has the three beneficial effects of consuming waste stone powder, solving the problem of sand rareness in normal construction in part areas and promoting popularization and application of the high performance concrete.

The invention discloses a method for processing net-combined-type neritic sea square net cages, relates to an aquaculture net cage, and provides a method for processing neritic square net cages. In the invention, a high-strength rope, a high-strength nylon warp knitting net and a copper alloy inclined square net are adopted. The method provided by the invention is characterized in that a double floating tube square frame structure is adopted in a buoyancy system of the net cage; 28 cylindrical foam floaters with the same specification are arranged under the two rows of floating tube frames; the net system of the net cage combines a first high-strength nylon warp knitting net, a second copper alloy inclined square net and a high-strength nylon warp knitting net used for the bottom of the net cage; after being equipped with ropes, the net at the bottom of the net cage is assembled on a high-density polyethylene frame; a vertical force net is longitudinally arranged along the net from the upper horizontal rope of the first high-strength nylon ware knitting net to the bottom of the net cage; 8 sinking blocks are hung on the high-density polyethylene frame used for the bottom of the net bottom evenly, and the weight of each sinking block is 5kg. The method provided by the invention is suitable to be applied to neritic square net cages.

The invention discloses a content testing method of river sand and coal ash in the concrete mixture, which comprises the following steps: sampling; segregating rough aggregate; segregating fine aggregate; preparing the gelatinization material sample; analyzing through chemical selection solution method; calculating the content of river sand and coal ash in the concrete, wherein the rough aggregate segregation adapts wash screening method of 4.75mm standard square mesh sieve; the fine aggregate segregation adapts wash screening method of 0.15mm standard square mesh sieve; the preparation of gelatinization material sample adapts the ceramic funnel to extract and filter the gelatinization material and water mixing paste and dry the filtered cement paste in the baking oven at 105-110 deg.c to constant weight.

The invention provides a combined box body system used for a floating net cage and a mated frame system thereof, relating to a seawater cultivation floating net cage. A copper alloy inclined square mesh, a copper alloy weaving mesh, high-strength polyamide warp knitting fishnet, ropes, a galvanized iron pipe and foam buoys. The combined box body system is characterized in that a floating net cageframe system comprises two rows of square galvanized iron pipe frames; the foam buoys are distributed below the two rows of galvanized iron pipe frames; the fishnet system of a net cage body combinesa first high-strength polyamide warp knitting fishnet, a second copper alloy inclined square mesh and the copper alloy weaving mesh used for the bottom of the net cage'; the edge installing wire ropeof the fishnet at the bottom of the net cage is assembled on a square high-strength polyamide pipe frame; the high-strength polyamide pipe frame and a horizontal wire rope at the lower edge of the second copper alloy inclined square mesh are connected by an ultrahigh-strength rope; and a vertical force net is installed in the vertical direction of the fishnet and extends to the edge wire rope of the copper alloy weaving mesh used for the bottom of the net cage.

The invention relates to a numerical simulation method for obtaining aircraft flow fields, wherein an interrupted Galerkin method based on non-structural right angle meshes is used to solve the flow field, and right angle meshes with a quadtree structure are used to disperse a to-be-solved flow field area into a set of meshes; each quadrilateral mesh is processed by dual-linear coordinate conversion, so each mesh under a current physical coordinate system can be mapped onto the next regular mesh in a computational coordinate system, so standard square meshes can be obtained; conservation variables in units under the computational coordinate system are obtained through numerical computation; a front face, a lower face, a left face and a right face of each mesh under the physical coordinate system are determined; according to differences between the left and right vibrations of unit interfaces, an interrupted detector is established; and the conservation variables in each mesh are processed by flow field display on the disperse meshes, so flow field distribution can be obtained. According to the invention, the interrupted Galerkin method based on the non-structural right angle meshes is introduced into flow field computation, so accuracy of the flow field computation is increased, and complicated flow phenomena can be solved.

The invention discloses a method for detecting water absorption of coke, comprising the following steps: (1) pulverizing the coke to 10-20 mm, sieving it horizontally with a 10 mm square-hole sieve, and taking the coke on the sieve as a sample; Put the sample into a drying box to dry, take out and cool down to room temperature to get dry coke; (3) add water to the dry coke to submerge the dry coke, and soak it; (4) filter the water out of the soaked coke, and use a cotton cloth to remove the water on the surface of the coke. Absorb it, and weigh the wet coke mass; (5) Calculate coke water absorption: coke water absorption = (wet coke mass - sample mass) ÷ sample mass × 100%. The method and the required equipment of the invention are simple and low in cost, and the gas permeability and combustion performance of the coke are evaluated by detecting the water absorption of the coke to guide the production.

The invention provides a shrimp trawl selective device which comprises a drum net cover, a guide net, a transverse separation grid, a longitudinal separation grid, an escape opening, a square mesh netbody, a net bag and a longitudinal force line. The tail end of the drum net cover is connected with the net bag, and the square mesh net body is further connected between the drum net coat and the net bag, and the square mesh net body is a node-free square mesh net cover, a square-mesh escape window is formed in the back of the net body; the drum net coat, the square-mesh net body, the longitudinal force line is arranged on the two sides of the net bag, and the longitudinal force line is an ethylene fiber rope. The guide net is located inside the drum net coat and is in a funnel shape with alarge end and a small end, and the large end of the guide net is sewed with the inlet end of the drum net coat, and a transverse separation grid is arranged at the abdomen of the drum net coat corresponding to the small end of the guide net, a longitudinal separation grid is arranged at the outlet end of the drum net coat, and an escape opening is formed in the drum net coat. According to the method and the device disclosed by the invention, the intra-species and inter-species separation of the byproduct can be realized.

There is provided an electromagnetic field intensity calculator for calculating the intensity of electromagnetic field radiated from an electric circuit device based on a moment method. A conductor pattern obtained from CAD data is divided into a square mesh pattern. In the mesh pattern of the outline part, the entire region in the mesh pattern is filled with the conductor pattern according to the ratio of area between the conductor pattern region and the blank region, or subjected to correction for blanking, so that a mesh data model is automatically configured by mesh pattern group consisting of only squares conforming to the moment method and reflecting the outline of the conductor pattern.

The invention discloses a process for manufacturing a porous sound absorption material by using blast furnace water quenching slag. In the method, the porous sound absorption material having a certain strength and excellent sound absorbing performance is manufactured by screening granular blast furnace water quenching slag processed by a water quenching process with a square-mesh sieve according to a certain grain size degree, making a bonding agent from silica powder added with solution of NaOH, performing compression forming at a pressure of 1.5 to 4.0MPa and sintering the formed product at a high temperature of about 1,100 DEG C for 1 to 6 hours. For the sound absorption material manufactured by the process, the sound absorption coefficient is more than 0.70, the first resonance frequency is less than 350Hz, and the strength is more than 4.0MPa. The method provides a new application for the blast furnace water quenching slag and has the advantages of simple manufacturing process, small required investment and low production cost. And the application of the method is expected to create excellent economic and environmental benefits.

The invention discloses a low-noise asphalt pavement mixture which is composed of the following components in percentage by mass: 40-50% of basalt 10-15, 40-50% of basalt 5-10, 2-10% of stone dust, 2-6% of lime rock machine-made sand, less than 5% of ore powder, 0.2-0.6% of fiber and 6.0-7.0% of asphalt, totaling 100%. The size distribution of the ores is as follows: the percent of ores passing through a 16mm square mesh sieve is 100%, the percent of ores passing through a 13.2mm square mesh sieve is 86-100%, the percent of ores passing through a 9.5mm square mesh sieve is 56-74%, the percent of ores passing through a 4.75mm square mesh sieve is 11-25%, the percent of ores passing through a 2.36mm square mesh sieve is 6-10%, the percent of ores passing through a 0.075mm square mesh sieve is 2-4%, and the void volume of the mixture is 18-20%. The pavement prepared by the asphalt mixture has the advantage of low noise.

The invention provides a method for improving the quality of a fly ash concrete admixture. 50 to 97 percent of undisturbed fly ash, 1 to 30 percent of blast furnace slag, 1 to 30 percent of tailings of magnet quartzite type iron ore or quartzite tailings or marble tailings or granite tailings or stone powder scrapped during stone processing, 0.1 to 1 percent of melamine formaldehyde resin sodium sulfonate, in weight percentage, are mixed and ground together until the triage of a 0.045mm square-mesh sieve is less than or equal to 12 percent. The off-standard fly ash and III-grade fly ash with a gross amount over 80 percent can be improved into the I-grade fly ash or II-grade fly ash according to the method, the utilization value of inferior fly ash can be raised substantially, and the method has advantages of good economic benefit, enlarging the amount of admixture, saving cement and improving the performance of concrete.

The invention provides a preparation method for producing aluminate gelled material by ferro vanadium waste, which is characterized in that, after the discharged hot ferro vanadium waste is cooled by wind, the ferro vanadium waste is smashed and milled into powder, wherein the fineness is required to meet the requirement that not more than 20 percent of screen residue is left after going through a 0.045mm square mesh sieve; and then the aluminate gelled material is obtained. The aluminate gelled material is characterized by high fire resistance degree, high compressive strength and rupture strength, good corrosion resistance, etc., which can be widely applied to amorphous refractory products.

A chain link woven mesh comprises successive undulated transverse links (1,2,3,4), which are interconnected together at the bent portions of the links, whereby each pair of successive undulated links (1,2), (3,4) forms a row of adjacent rectangular or square meshes (5) with four sides. At least at one border of the mesh, for each pair of successive links, the last side of the first link (1) is bent upwardly and backwardly over a sharp angle, whereby the end of this last side is hooked around the penultimate (last but one) side of the second link (2). The last side of the second link (2) is bent downwardly and backwardly over a sharp angle, whereby the end of this last side is hooked around the penultimate (last but one) side of the first link (1). The advantage is that a very strong border is obtained.

The invention discloses a communication implementation method for a wireless network. The movement area of the wireless network is composed of 2n1*2n2 two-dimensional square meshes, wherein n1 and n2 are positive integers, the side length is the transmission radius r of a mobile node, the coordinates of each mesh are (x, y), and x and y are nonnegative integers; the mobile node obtains the geographic coordinates (Gx, Gy) thereof through GPS technology, and the coordinates of the mesh where the mobile node is located are obtained according to a formula. The communication implementation method for the wireless network is used for such fields as vehicle monitoring, medical treatment and health, and national defense and military, for example, in the vehicle monitoring field, the communication implementation method technology for the wireless network is used for monitoring the road congestion, each vehicle can be provided with a plurality of nodes, after each node is configured with an address, the nodes can communicate information to transmit the road traffic situation to effectively avoid road congestion and keep traffic smooth, and therefore, the technology has high popularization value.

The invention discloses a sapphire optical window with an electromagnetic shielding function. The sapphire optical window comprises a sapphire substrate; an electromagnetic shielding functional film layer, a hard multiband antireflection film and a hydrophobic film which are sequentially evaporated on the sapphire substrate. The electromagnetic shielding functional film layer is composed of a first aluminum oxide film layer, a metal mesh film layer embedded into the first aluminum oxide film layer and a second aluminum oxide film layer plated on the metal mesh film layer. The metal mesh film layer is formed by the periodic arrangement of square mesh units in a first aluminum oxide film layer, and the edge of the second electromagnetic shielding functional film layer is plated with an edgeelectrode film layer forming ohmic contact with the metal mesh. The invention also discloses a preparation method thereof. According to the invention, the sapphire optical window is mainly used in a marine environment and an underwater pressure-bearing environment, and the window has the functions of 4MPa water pressure resistance, salt mist resistance, seawater soaking resistance and mould resistance, and has high transmittance in visible light and medium-wave infrared bands, wherein the average electromagnetic shielding effectiveness at 30MHz-1.5 GHz bands reaches 30dB or above.

The invention discloses a double-layer net bed for repairing water by planting submerged plants. The double-layer net bed comprises an upper net sheet and a lower net sheet, wherein the upper net sheet is a quadrilateral net sheet with square meshes, and the side length of the square is 1 -5cm; the lower net sheet is a quadrilateral fishing net with square meshes, and the side length of the square is 2-10mm; four corners of the upper net sheet and the lower net sheet are fixed on four piles in quadrilateral arrangement respectively; and the upper net sheet is 3-5cm away from the lower net sheet. According to the size of the upper mesh, a bundle of vallisneria can be exactly inserted into the mesh, and the roots of the vallisneria can be ensured to contact the lower net sheet; and according to changes of the water level and the transparency of water to be repaired, ecological niche is continuously changed so as to overcome the limitation on submerged vegetation restoration by the transparency and improve the repairing effect.

The invention discloses a particle shaping method for machine-made aggregate. The method comprises the steps that the broken machine-made aggregate is firstly sieved through a square mesh sieve to obtain the thick aggregate with the nominal particle diameter of 5-40 mm and the thin aggregate with the nominal particle diameter smaller than 5 mm, and then rolling shaping treatment is performed on the thick aggregate and the thin aggregate through a rolling machine to obtain the shaped thick aggregate and thin aggregate. According to the shaping method, the content of elongated and flaky particles can be decreased, the strength of the recycled aggregate is improved, and the improvement of the workability of a freshly mixed concrete mixture is facilitated.

The invention provides a culture method of cultchless oysters. The method includes the steps of primary spatfall culture, wherein first plastic sheet substrata with roughened surfaces are hung in an oyster spat pool, it is guranateed that the plastic sheet substrata are immersed in water of the oyster spat pool, a sunshade net is additionally arranged over the oyster spat pool, and primary spatfall culture is carried out; secondary spatfall culture, wherein the first plastic sheet substrata obtained after primary spatfall culture are taken out of the pool, oyster spats adhering to the first plastic sheet substrata are sheared off one by one along the edges and then adhere to adherence points of second plastic sheet substrata, each second plastic sheet substratum is of a black plastic square mesh structure with the four corners provided with through holes, each mesh is provided with four adherence points, every 10 second plastic sheet substrata to which oyster spats adhere are strung together with ropes in a vertical stringing mode to form a substratum string, a weight is hung at the lowermost portion of each substratum string to prevent the substrata from floating or twining underthe action of water flow, and the substrata are hung in seawater for secondary spatfall culture.