115results about How to "Guaranteed not to crack" patented technology

The invention belongs to the field of materials of lithium ion batteries, and particularly relates to a negative electrode of the lithium ion battery and a preparation method thereof. The negative electrode of the lithium ion battery comprises a current collector and negative electrode paste for coating the current collector, wherein the negative electrode paste comprises the following dry ingredients by weight percent: 92-99% of active material and 1-8% of an adhesive; the active material is graphite or graphite alloy; the adhesive is waterborne multi-component copolymerization emulsion. The waterborne multi-component copolymerization emulsion is used for replacing conventional butadiene styrene rubber and serves as the adhesive for the lithium ion battery, so that the more excellent adhesive performance is realized in comparison with the adhesive performance of a conventional adhesive, and meanwhile, the prepared battery has prominently excellent performances such as good low temperature characteristics, low circulation expansion rate, good long cycling performance and relatively excellent processing characteristics; the negative electrode prepared by using the method has relatively small impedance and relatively good dynamic performance and is capable of effectively solving the problem of risk of separation of lithium in the lithium ion battery at low temperature; the prepared battery has the characteristics of safety, reliability and long cycle life.

The invention provides cement polymer based high-temperature concrete permeable pavement bricks and a manufacturing method thereof and belongs to the field of road surface pavement materials. Each cement polymer based high-temperature concrete permeable pavement brick is prepared from a permeable base layer and a permeable surface layer, wherein the permeable base layer is prepared from 290 to 345 parts of cement A, 0 to 6 parts of ultra-light aggregate A, 1630 to 1765 parts of coarse aggregate, 255 to 290 parts of sand, 0.50 to 0.85 part of polymer emulsion A, 0.35 to 0.50 part of an interface reinforcing agent A and 0 to 0.65 part of a loose soil constriction resisting agent; the permeable surface layer is prepared from 390 to 425 parts of cement B, 0 to 2 parts of ultra-light aggregate B, 0 to 7.5 parts of micro-pore fine aggregate, 1350 to 1400 parts of wear-resisting fine aggregate, 0.65 to 0.85 part of polymer emulsion B, 0.65 to 0.95 part of an interface reinforcing agent B, 8 to 13 parts of a deicer salt scaling resisting and alkali adsorption agent and 15 to 17 parts of pigment. According to the cement polymer based high-temperature concrete permeable pavement bricks, all technological performances of the permeable bricks are comprehensively improved.

The invention provides a machining and manufacturing method and application of heat-resistant titanium alloy Ti60 wires. The method comprises the steps that Ti60 titanium alloy ingot castings are smelted by adopting a vacuum consumable smelting technology; the smelted Ti60 titanium alloy ingot castings are forged into rods by adopting a free forging technology; the Ti60 titanium alloy rods are finish-forged into thick rod blanks by adopting a finish forging technology; the Ti60 titanium alloy thick rod blanks are rolled into straight strip wire blanks by adopting a hot rolling technology; surface treatment is conducted on Ti60 titanium alloy annealing wire blanks, and pre-oxidation oxidation film hanging treatment is conducted after defects on the surfaces of the wire blanks are removed; continuous high-temperature drawing deformation is conducted on the Ti60 titanium alloy wire blanks obtained after surface treatment by adopting a straight wire drawing machine; the drawn wires are straightened by adopting electric heating tension; and annealing heat treatment is conducted on the straightened wires, and finally centerless grinding is conducted. According to the machining and manufacturing method and application of the heat-resistant titanium alloy Ti60 wires, through combination of different heat machining and heat treating technologies, different matching combinations of the tensile strength, the plasticity and the shearing strength can be obtained, and the heat-resistant titanium alloy Ti60 wires can be used for manufacturing advanced aerospace fasteners such as rivets, bolts and nuts and are used in the temperature range of 600-650 DEG C.

The invention relates to a foamed concrete building block made of waste residues of ceramics and a method for manufacturing the foamed concrete building block. The foamed concrete building block is manufactured by the following steps of: uniformly stirring waste residues of ceramics, waste polystyrene foam, Portland cement, calcium oxide, calcium sulphate, bentonite, a polycarboxylate high-efficiency water reducing agent, sodium cellulose glycolate, aluminum sulphate, sodium chloride and water, which serve as raw materials, by using a twin-shaft mixer, and mixing the mixture with tea saponin and saponin powder to form foam; under the full-automatic control of a computer, conveying the mixture to a high-speed mixed foam pulping mixer by using a spiral tube conveyor, uniformly stirring the mixture to obtain pasted foam pulp; and transmitting the foam pulp to a mold, moulding the foam pulp to obtain a concrete building block mould, reshaping, and transmitting the shaped mould to a curing room for solidifying; and demolding, performing automatic stacking, packaging, and storing the packaged concrete building block in a storage yard. The product has the advantages of light weight, high strength, environment friendliness, low cost and high benefits and is in line with the national rules and regulations about energy conservation and emission reduction, development of low-carbon economy and environmental protection.

The invention belongs to the technical field of heat treatment of heavy industry, and particularly relates to a heat-treating process for hot-working die steel forgings. The heat-treating process comprises the following steps: spheroidizing and annealing, quenching, cooling and tempering. The heat-treating process is suitable for 5CrNiMo die steel or H13 die steel; spheroidizing and annealing heat treatment is added before quenching, so that the preheating treatment structure of a workpiece is transformed into globular pearlite and cementite; the risk of a quenching crack of the workpiece is reduced; the quenching temperature is improved; austenization is relatively full; and the temperature of a quenching medium is improved. Warm water at 40-60 DEG C is adopted as the quenching medium, so that the performance of the workpiece is improved under the premise that no crack of the workpiece is ensured. Through combination of three improvement points, the performance of the workpiece, especially the impact strength is obviously improved; and the performance requirements are met.

The invention discloses a micro-alloyed cast iron glass die. The micro-alloyed cast iron glass die comprises, by mass, 3.55-3.65% of C, 1.85-1.95% of Si, 0.50-0.55% of Mn, 0.05-0.10% of Cr, 0.05-0.10% of Ni, 0.50-0.55% of Mo, 0.06-0.07% of V, 0.10-0.20% of Ti, 0-0.10% of Cu, and the balance Fe. A making method of the glass die comprises the steps of melting, inoculating, casting and annealing, and an inoculant adopts a 75 ferrosilicon inoculant and a silicon-barium inoculant as a coinoculant to carry out stream inoculation + ladle inoculation + cavity inoculation mode mixed inoculation. A position having a distance of ~8mm to the inner cavity of the micro-alloyed cast iron glass die made in the invention is characterized in that the graphite has a D-shaped form and a length of 6-8 grades, the pearlite quantity is less than 5%, no carbides exist, and the mechanical properties are excellent.

The invention discloses resistance slurry used for a thick film circuit and based on a ceramic tile and a preparation process thereof. The invention aims to provide the resistance slurry capable of being matched with the ceramic tile and provides the possibility to the preparation of a novel floor heating element. The resistance slurry is characterized in that microcrystal glass powder composed of Bi2O3, SiO2, Al2O3, ZnO, B2O3, CuO and Ni2O3, silver powder, and an organic binding agent composed of terpilenol, tributyl citrate, alcohol ester 12, ethyecellulose, hydrogenated castor oil and lecithin are put into a container at a weight ratio of the microcrystal glass powder to the silver powder to the organic binding agent of (48%-64%) to (16%-38%) to (15%-30%), and then are stirred and rolled by a three-roller rolling mill to form the finished-product resistance slurry. The resistance slurry disclosed by the invention has the main effect that the resistance slurry can be directly printed on the back face of the ceramic tile to form the thick film circuit.

The invention discloses a heat-resistant wear-resistant steel plate and a production method thereof. The heat-resistant wear-resistant steel plate consists of the following components in percentage byweight: 0.33%-0.40% of C, 0.2%-0.4% of Si, 0.80%-1.00% of Mn, 0.5-0.7% of Cr, 0.2-0.4% of Mo, 0.015%-0.03% of Nb, 0.0005-0.0022% of B, 0.10%-0.20% of Ti, 0.015%-0.045% of Als and the balance of Fe and inevitable impurities; and impurity elements in steel are controlled as follows: less than or equal to 0.015% of P, less than or equal to 0.005% of S, less than or equal to 0.0040% of [N] and less than or equal to 0.0020% of [O]. According to the heat-resistant wear-resistant steel plate and the production method thereof provided by the invention, the steel plate has surface hardness greater than HB400 after being tempered at a temperature lower than 500 DEG C; the production method is simple, and does not need special compound equipment; and residual stress is low, cracks are not liable togenerate, components are simple and common, and the cost is low.

The invention provides a control method for preventing a factory grade level from cracking. The method comprises the step of: dividing the factory grade level into blocks for pouring, wherein the area of each block is less than or equal to 6*8 square meters; during pouring, benzene plates or foaming plates with the thickness of 8 to 10 millimeters are vertically arranged in a connected gap between every two adjacent blocks, on the edge of the wall and at the periphery of a column; and the height of each of the benzene plates or the foaming plates is 8 to 10 millimeters lower than the thickness of the grade level. The method has the advantages that: the benzene plates are arranged on the edge of the wall and at the periphery of the column; when the foundation of a house main structure is subjected to differential settlement, the adjacent grade levels and the peripheral wall surface are not influenced mutually due to the partition of the benzene plates, so the damage to the grade level is reduced greatly during the differential settlement,, and cracks due to a temperature difference between the indoor and the outdoor can be prevented; moreover, steel bars arranged at the periphery of the column enhance the integrity of the sides of the column; and after the pouring of the grade level is finished, the periphery of the grade level is subjected to lancing and caulked joint to reduce inclined cracks on the sides of the column effectively.

The invention relates to an abrasion resistant steel and low-carbon steel dissimilar metal consumable electrode gas shielded welding technology and belongs to the technology field of dissimilar metal welding technologies. According to the technology, by the adjustment and controlling to welding positions, welding parameters, interlayer-temperature and the like, when the high-carbon and high-manganese abrasion resistant steel is welded with the low-carbon steel dissimilar metal, the purposes of preheating before welding and slow cooling after welding are achieved, so that no cracks occur in welding seams after welding is completed, the welding seams do not crack after being heated again through a heating furnace, and it is guaranteed that rolling goes on smoothly. Compared with a traditional abrasion resistant steel and low-carbon steel dissimilar metal welding technology, the abrasion resistant steel and the low-carbon steel dissimilar metal consumable electrode gas shielded welding technology has no special requirements for raw materials and equipment, so that the manufacturing cost is lowered.

The invention relates to a device and a method for preparing an undisturbed soil sample of a ring cutter. The device comprises a work table, a support column, a soil sample lower backing plate, a force transmission frame, a pressing head, a lever, a spring clip and other common tools for preparing the soil sample, wherein the preparation materials can be steel, aluminum, alloys and the like. By utilizing the device and the method, the original sample of the ring cutter is prepared under a condition that a sample box is not completely opened, so that an opportunity that the soil sample is damaged in the preparation process of the sample is effectively reduced; for soil samples of loess, cracked clays and the like which are easily cracked, the ring cutter sample with high quality can be prepared, and the sample manufacturing success ratio is high and the scrap ratio is low; and for sand soil with low cohesive force, the original sand soil sample can be sampled by a common soil taking device so as to further prepare the undisturbed soil sample of the ring cutter.

The invention discloses an 825 / X70 / 825 double-sided clad plate and a production method thereof. A composite blank for preparing the clad plate includes an X70 low alloy steel base material and an 825alloy composite; the lengths and widths of the base material and composite are the same, the lengths are 2-4 m, the widths are 1-3 m, and the thickness ratio is 2-10; the composite blank can be formedby the composite and base material which are successively stacked and machined according to the sequence of the composite, the base material and the composite, and vacuum electron beam seal welding can be performed on the composite blank after vacuum pumping; and the welded composite blank can be heated to 1,200-1,250 DEG C to perform heat preservation, an initial rolling temperature is 1,180-1,200 DEG C, a single pass reduction rate is greater than or equal to 10%, and the first three pass reduction rates are greater than or equal to 15%, and the total reduction rate is greater than or equalto 75%. The produced clad plate of 5-70 mm is excellent in corrosion resistance on inner and outer sides, excellent in mechanical properties of center parts, and suitable for making requests of highcorrosion resistance for the inner and outer sides and simultaneously considering the pipeline manufacturing of whole structure mechanical properties.

The invention provides a non-shrinkage high-sound-isolation self-heat-insulation heat-isolation sand light wall module and a manufacturing method thereof and belongs to the field of wall materials. The module and the manufacturing method solve the technical problems that sand with the sand content larger than 3% can not be used as an existing wall material, cracking occurs, the sound-isolation effect is poor, and a light wall material can not serve as a self-bearing wall. A non-bearing wall module is manufactured through super-light aggregate, cement, sand, bulk cement shrinkage-preventing agents, interface activity enhancers, solution viscosity hollow particle polymer and water. A self-bearing wall module further comprises coarse aggregate. The non-bearing wall module is manufactured in the steps that materials are stirred, poured into a half-piece type mould, pressurized and formed through variable-frequency vibration and buffering, and maintained; adhesive faces are cut flattened and bonded together, and the periphery of the module is cut and flattened. The self-bearing wall module is manufactured in the steps that materials are stirred, poured in a whole-piece mould, pressurized and formed through variable-frequency vibration and buffering, and maintained. The wall module integrates non-shrinkage, self-heat-insulation, heat-isolation, high-sound-isolation and fire resistance, sand with the sand content being 3-25% is used, the manufacturing method is simple, and construction is convenient.

The invention relates to a foam concrete block produced with waste ash and a manufacturing method thereof. The manufacturing method is characterized in that waste ash, waste polystyrene foam, portland cement, calcium oxide, calcium sulfate, bentonite, polycarboxylate superplasticizer, sodium carboxymethyl cellulose, sodium lauryl sulfate, aluminum sulfate, sodium chloride, borax and water are used as raw materials, the raw materials are uniformly mixed by a double-shaft mixer into mixture, foam is prepared through mixing the mixture with sodium dodecyl benzene sulfonate and polyacrylamide, a computer is used for fully automatic control, the mixture is fed by a spiral tube conveyor into a high-speed mixing and soaking slurry-producing mixer and is mixed well into paste type foam slurry, the slurry is poured into a die, shaped and then delivered into a curing room for curing, the cured product is fed into a stripping machine for stripping, stacking, packaging and storage on a yard are performed after stripping, and thus the foam concrete block product made of the waste ash is prepared. The product has the advantages and effects of light weight, heat preservation, thermal insulation, sound insulation, capabilities of being nailed, sawn and processed into different specifications, high strength, no pollution, low cost and good profits, and complies with national requirements for energy conservation, emission reduction, development of the low-carbon economy and environmental protection.

The invention discloses a method for controlling an investment casting to solidify. The method comprises the steps of determining water-immersed cooling parameters of a mold shell which is cast; manufacturing a wax mold, and combining into a mold group; painting the mold group so as to prepare the shell, reinforcing the outer surface of the mold group when 50% to 70% of the schedule of the shell layer preparing number is completed, and then continuing to implement the painting and shell preparing procedure; dewaxing and roasting after the shell preparation is completed so as to form the finished mold shell; and casting, and performing water-immersed cooling treatment on positions, which need to be cooled, of the mold shell according to the water-immersed cooling requirement after casting.According to the method for controlling the investment casting to solidify, the mold shell is properly reinforced, so that the mold shell is not cracked in a water cooling process, and the cooling process and positions of the mold shell which is cast are improved by utilizing a casting process simulation analysis technique, so that the purpose of controlling the casting to solidify during investment casting is achieved, the local solidifying and cooling speed of the casting is increased, the defects of shrinkage cavities and looseness of the casting are avoided, and the yield and the rate of finished products of the casting are increased.

The invention discloses a high-shear-strength super-thick composite steel plate for a generation III nuclear power station and a manufacturing method of the composite steel plate. The composite steelplate consists of steel-plate carbon steel and 304L austenitic stainless steel. The assembly sequence is as the follows from top to bottom: stainless steel, carbon steel, an isolating agent, carbon steel and stainless steel. Edge sealing is carried out on four edges of a combined billet by welding, vacuumizing treatment is carried out, and the vacuum degree is 100 Pa or lower. The heating temperature of the combined billet is 1200-1270 DEG C, the heating time is 10-15 hours, the single-stroke reduction rate is 5%-15%, the final rolling temperature is controlled to be 1050 DEG C or above, tempering heat treatment is carried out after rolling, the quenching temperature is 870-930 DEG C, the heat preservation time is 2-4 min / mm, and the heating rate is 1.0-1.5 min / mm. The tempering temperature is 620-660 DEG C, the heat preservation time is 3-6 min / mm, and the heating rate is 1.5-2.0 min / mm. The thickness of a finished composite steel plate is 29-110 mm, the shearing strength is good, andthe requirement of steel for composite boards of a nuclear power station is met.

The invention discloses a blackbody material and an energy-saving radiation cup made of such blackbody material, belonging to the technical field of energy-saving material. The blackbody material is composed of the following constituents according to percentage by weight: 95% of silicon carbide, 0.5% of iron trioxide, 0.5% of manganese dioxide and 4% of aluminum oxide. The energy-saving radiation cup comprises a cup body and a cup bottom, wherein the cup body is in the shape of a straight cylinder, the middle of the cup body is a hollow cavity, the part of the hollow cavity close to the cup bottom is spherical, and the section of the outlet of the hollow cavity is trapezoidal; an arc groove is arranged on the cup bottom plane. The blackbody material provided by the invention has the advantages of greatly reducing heating-up time of hearth and improving the uniformity of hearth temperature, improving the capacity of industrial kilns and industrial boilers, and saving fuel, wherein the energy saving rate can be 7%-20%.

The invention relates to a quench cooling process for H13 steel. The process sequentially comprises a grading heating step, a gas cooling step, a water cooling step and an air cooling step. During quench cooling in the invention, gas cooling, water cooling and air cooling occur in order. Water cooling speeds up the cooling rate of quenching, so that austenite is rapidly supercooled to a martensite region, thus ensuring a martensitic structure obtained during quenching. The air cooling after water cooling greatly slows down the cooling rate, therefore, the structural stress generated when the austenite structure transforms into the martensitic structure is reduced, thus guaranteeing that a workpiece does not crack and a deeper hardening layer can be obtained. The process provided in the invention is suitable for quench cooling of H13 steel.

The invention belongs to the technical field of environment protection and discloses a preparation method of a water dephosphorization porous ceramic filter ball. Typical solid waste is used as a rawmaterial for collaborative treatment. The method includes: pretreating a raw material, controlling raw material grain size, and grading; uniformly mixing the raw material to obtain paste; granulating,and aging; performing gradient temperature-controlled calcining, wherein the raw material is composed of, by mass, 21-65% of Bayer-process red mud, 9-38% of urban domestic waste incinerator slag, 4-23% of excitant, 3-15% of pore forming agent and 5-10% of binder. The porous ceramic filter ball prepared by the method has the advantages of high porosity, uniform pore distribution, large specific surface area, high water absorptivity, high dephosphorization ability and speed and resistance to hydraulic impact, is excellent in various physiochemical properties, can be applied in water dephosphorization and can realize solid waste cooperative treatment and recycling and reduce solid waste accumulation.

The invention relates to the technical field of aluminum alloy fasteners. The invention further discloses a machining method of a high-strength aluminum alloy sleeve. The high-strength aluminum alloysleeve comprises the following alloy elements in parts by weight: 0.2%-6% of Zn, 0.2%-6% of Mg, 0.2%-3% of Mn, 0.2%-4% of Cu, 0.1%-2% of Sc, 0.1%-2% of Yb, 0.1%-1% of Tb, and 0.2%-2% of Zr, with the balance being Al. According to the machining method, after the selected alloy components are subjected to aging treatment, the alloy sleeve can meet the requirements that the tensile strength is 450 MPa or above and the hardness is 160 HV or above. Warm upsetting forming is performed on the material; the hot temperature, the heating time and the production speed are controlled, it is guaranteed that a product does not crack in the forming process, meanwhile, the mechanical property is not obviously reduced, the production efficiency can reach 50 pieces per minute or above through the warm upsetting technology, the material utilization rate reaches 90% or above, the efficiency is improved by 100 times or above than that of a traditional machining mode, and the product machining cost is greatly reduced.

The invention provides a method for producing H-shaped support piles which are low in cost, bending resistant, shearing resistant and high in intensity. The technical scheme includes that the method specifically includes: (1) placing stop plates on the baseplate of an H-shaped support pile die or at two ends of the baseplate, serially connecting the stop plates on prestressed steel via holes on the stop plates, serially connecting a plurality of stirrups on the prestressed steel, connecting one end of the prestressed steel on a first tensioning device, and connecting the other end of the prestressed steel on a second tensioning device; and (2) adjusting distributing distance of the stop plates and the stirrups, closing the H-shaped support pile die to tension the prestressed steel, and the like.

The invention discloses a nuclear power station reactor core cooling system safety injection box composite steel plate and a manufacturing method thereof. The steel plate is composed of carbon steel of tempered sorbite organization and 304L austenitic stainless steel. The steel billets are symmetrically compounded, an upper layer and a lower layer are carbon steel, two layers in the middle are stainless steel, and an isolating agent is added between the two layers of the stainless steel. The vacuum degree of a composite billet is 1.0-5.0 x 10<-2>Pa. A heating temperature is 1200-1250 DEG C, heating time is 10-15 hours, a single-pass pressing rate is 5%-15%, and the final rolling temperature is larger than or equal to 1000 DEG C. The quenching temperature is 890-920 DEG C, the heat preservation time is 2-3 min / mm, the temperature rising rate is 1.0-1.5min / mm, and water is cooled to be less than or equal to 100 DEG C after being discharged from a furnace. The tempering temperature is 630-660 DEG C, the heat preservation time is 4-6 min / mm, and the temperature rising rate is 1.5-2.0 min / mm. According to the manufacturing method, the produced steel plate has high normal temperature andhigh temperature performance, good shearing strength and bonding strength, and meets requirements for the steel usage by the nuclear station.

The invention discloses an anti-rut pavement paving method capable of continuously paving a base layer and a surface layer, and belongs to the field of road engineering. The method is characterized inthat a super-early-strength anti-cracking cement stabilized macadam base layer is paved firstly, and after the base layer is rolled, a cold-mixed cold-paved rigid-flexible composite surface layer ispaved under the condition that the surface is still in a wet state. Compared with the prior art, according to the anti-rut pavement paving method capable of continuously paving the base layer and thesurface layer, continuous paving of the cement stabilized macadam base layer and the surface layer can be realized; maintenance time for 7 days of the cement stabilized macadam base layer can be omitted, meanwhile, the continuity of the base layer and the surface layer is improved, the overall cooperative stress of the pavement structure is guaranteed, a permeable layer and a macadam sealing layerdo not need to be sprayed on the surface of the cement stabilized macadam base layer, and the construction cost is reduced. Meanwhile, the cold-mixed and cold-paved rigid-flexible composite surface layer does not need centralized hot mixing, so that construction is convenient, resources are saved, and the environment is protected. The anti-rutt pavement structure with the base layer and the surface layer capable of being continuously paved has high high-temperature anti-rutting performance, anti-cracking performance, water stability and durability, and has high popularization and applicationvalues.

This invention discloses a process for synthesizing epoxy vinyl ester resin with low exothermal peak. The process comprises: reacting bisphenol A type epoxy resin with epoxy equivalent of 455-1000 g / mol, and unsaturated organic monocarboxylic acid at 120-160 deg.C in the presence of catalyst and polymerization inhibitor, and then diluting with crosslinkable monomer. The obtained epoxy vinyl ester resin has low exothermal peak (90-120 deg.C), low shrinkage, high toughness, and moderate viscosity, good wetting performance with glass fibers and glass textiles, and high chemical corrosion resistance. The epoxy vinyl ester resin can be used in molding process of fiber-reinforced plastics by pasting, winding, stretching or injecting.

The invention relates to a flexible die hot pressing furniture edge sealing device and a furniture heteromorphous component edge sealing technique. The edge sealing device comprises an outer casing boy with a lower mounting opening, an inflatable bag arranged in the outer casing, a flexible heat pipe located below the inflatable bag, an insufflation port extending out of the outer casing is formed in the inflatable bag, and the capacity of air in the inflatable bag is larger than the volume of the outer casing. According to the invention, the flexible die hot pressing edge furniture edge sealing device formed by the outer casing, a flexible die inflatable bag arranged in the outer casing, the flexible heat pipe and the like are adopted, so that when in use, the flexible die hot pressing furniture edge sealing device to inflate and pressurize the inflatable bag to achieve pressurization of the flexible heat pipe and enable a sealing edge strip rubberizing surface to quick shape and solidify, so that an edge sealing strip is quickly and efficiently clung to the edge of a heteromorphous component, and the pressed and shaped furniture heteromorphous component edge sealing has enough strength, good stability, and a product surely cannot degum and crack in case of humidity change. The flexible die hot pressing furniture edge sealing device and the furniture heteromorphous component edge sealing technique can be widely applicable to the field of furniture.

The invention belongs to the technical field of dielectric insulation characteristic testing, and particularly relates to a device and a method for detecting dielectric insulation characteristics. Thedevice comprises a first cavity which is provided with a sealed space for accommodating a medium and is used for testing the insulation characteristic of the medium to be tested; wherein a first electrode and a second electrode are arranged in the first cavity; a second cavity, provided with a sealed space for accommodating a medium and used for controlling the temperature of the first cavity; amedium container, connected with the first cavity through a pipeline; and an air extracting pump, used for extracting air in the device and adjusting the vacuum degree of the device. The device can simultaneously test the insulativity of a medium under the conditions of low temperature, high air pressure, high voltage and high air tightness, the minimum temperature can reach -269 DEG C, the maximum temperature can reach 300 DEG C, and the maximum pressure intensity can reach 30 atmospheric pressures.

The invention discloses a box type top plate structure for a large-span city tunnel. The box type top plate structure for the large-span city tunnel comprises a tunnel top plate, wherein the tunnel top plate comprises upper plates and lower plates, and the upper plates and the lower plates are arranged between tunnel side walls in a spaced mode; end plates are correspondingly arranged at the two ends of a cavity formed by enclosing the upper plates, the lower plates and the tunnel side walls; and the inner part of the cavity is divided into a plurality of box chambers arranged in the longitudinal direction by webs, form stripping holes are formed in the upper plates of all the box chambers, the lower plates of all the box chambers all adopt waterproof mortar to find a slope, and ventilation drainage holes are formed in the lower plates. A continuous beam structure of the box type top plate structure for the large-span city tunnel is convenient to design and construct, the top plate self weight and soil covering thickness can be reduced, and then loads borne by the top plate, even the side walls, middle walls and a bottom plate are reduced; and especially, when prestressing force isset, the span of a city tunnel cross section can be enlarged to a greater extent, and the regular rebar use quantity required by crack-resistant design control is greatly reduced.

The invention relates to a wood drying method, which is a method for controlling a wood drying process by wood stress. In a drying process, the bending degree of a stress test piece represents a stress value to control the temperature and the moisture of a drying kiln so as to control a wood drying process. Wood of a certain length is sawn on dried material; the sawn wood is equally divided into two parts on the half of the thickness direction along the fiber direction, i.e. a first stress test piece and a second stress test piece; except the wood surface, the two stress test pieces seal rest five surfaces to isolate the five surfaces from air; then, the five sealing surfaces of the second stress test piece are fastened by a fixing sleeve; the two stress test pieces are put on the position with the highest drying speed in the drying kiln along with the dried material; the stress of the dried material is judged according to the bending degree of the two stress test piece; and the bending degrees of the stress test piece is observed to control the temperature and the moisture of a drying medium and the drying kiln so as to guarantee the drying quality of the wood and prolong the service life of the dried material. The method is especially suitable for drying tree types which are difficult to dry.

The invention discloses a construction method of an urban tunnel branching port with a box type top plate structure. A box type top plate comprises upper plates and lower plates which are arranged between the side walls of a tunnel at intervals, wherein main port end plates are arranged at one ends of cavities enclosed by the upper plates, lower plates and the side walls of the tunnel, and branching port structures are formed by the other ends of the cavities through side beams and outer branching port end plates. The interiors of the cavities are divided by webs into a plurality of boxes arranged in the longitudinal direction, mould removing holes are formed in the upper plates of the boxes, and ventilation drainage holes are formed in the lower plates of the boxes by using waterproof mortar to find the slope. The construction method mainly comprises the steps that foundation pits are excavated; concrete is poured on tunnel bottom plates, side walls and embedded columns of branching ports; concrete is poured on the lower plates, the webs, the side beams, the main port end plates, the branching port end plates and the upper plates; and finally a waterproof layer is arranged, and the backfilling of covering soil is carried out. According to the construction method, the self-weight of the structural top plates can be reduced, the thickness of the covering soil of the structural top plates is reduced, loads on the structure are reduced, and the span of an urban tunnel section is increased.