427results about How to "No collapse" patented technology

The invention relates to a 3D printing technology, and aims at providing a multistage-temperature-control-based fused deposition modeling (FDM) type 3D printing sprayer and a temperature control method. The multistage-temperature-control-based FDM 3D printing sprayer comprises a printing sprayer body and a heating device arranged at the outer part of the printing sprayer body, and is characterized in that a forming chamber inside the printing sprayer body is divided into four parts of a fuse feeding section, a transition section, a fusion section and a printing and extruding section; the heating device is divided into three sections which are correspondingly arranged at the outer sides of the transition section, the fusion section and the printing and extruding section of the forming chamber, and each section of the heating device comprises an electric heater and a temperature sensor which are independent and is respectively connected with a multistage temperature control module of an FDM type printing sprayer through a signal wire. The multistage-temperature-control-based FDM type 3D printing sprayer is capable of realizing the corresponding gradient control of temperatures of all sections of the printing sprayer and ensuring that an FDM printing material is always kept in a printable state, and can not cause the problems of layer collapse, damage and blockage due to overhigh or overlow temperature due to the adoption of single temperature control; and meanwhile, the blockage and the fracture of a wire of a conventional printing head are avoided, and the quality of formed products is improved.

The present invention discloses a method of cryogenic surface activation direct bonding for preparation of a quartz glass capillary tube. According to the method, a wet chemical method is used to activate a quartz glass surface, and the manner of direct bonding of a stack of multiple layers of glass is applied, so as to prepare the quartz glass capillary tube at a lower temperature with a proper pressure. A steel needle of a specific size is added to a model and used to define a size and location of the capillary tube. The minimum diameter of the capillary tube prepared can reach as small as 200 micrometers ,and the bonding strength can reach 5 MPa. According to the method, the operation of cryogenic surface activation bonding is simple, the requirement on the glass sheet surface roughness is low, and no clean room or expensive ultra-high vacuum plasma treatment device is required. The method overcomes the problems of the pipe collapse, the device superficial devitrification and the inner wall roughness that may be caused by the conventionally prepared capillary tubes. The capillary tube produced has the smooth inner wall, increases the viewable region of the sample in the capillary tube, and dramatically improves chip performance.

The invention relates to a filling method and system of coal mine goaf. The filling system comprises a filling bin, a feeder, a weighing hopper, a stirrer, a slurry machine, a filling pump, a delivering pipeline, a working face pipe and a tee pipe, wherein the filling bin is respectively connected with the inlet of the stirrer through the feeder and the weighing hopper; and the outlet of the stirrer is connected to a filling point through the slurry machine, the filling pump, the delivering pipeline and a tee valve. The filling method comprises the steps that barren rocks with granularity of less than 25mm, a cementing agent, pulverized fuel ash and water are delivered to the weighing hopper through the feeder for weighing; the barren rocks, the cementing agent and the pulverized fuel ash are mixed in a mass ratio of 1:(0.22-0.80):(0.35-0.57), and are added with water to produce slurry in a mass concentration of between 70 and 83 percent through the stirrer; and the slurry is delivered to the filling point for filling through the slurry machine, the filling pump, the delivering pipeline, the working face pipe and the tee valve. According to the filling method and system, the sources of filling materials can be enlarged, the filling substance strength and durability can be increased, the filling material can be delivered to the filling point and uniformly filled by delivering and filling in a slurry state, and the filling effect can be improved.

The invention discloses a tunnel freezing consolidation and soil-accumulating watering shield arrival method, which comprises the following steps of: (1) consolidating a stratum of a tunnel arrival section by using a jet pile or a mixing pile; (2) stopping water for a stratum close to an opening of a receiving well by using a freezing method; (3) removing a retaining wall of a tunnel portal, and filling in the receiving well to obtain a mound; (4) injecting water into the receiving well to reach the designed height; and (5) making a shield machine tunnel to enter the receiving well structure to finish the whole receiving work. By the method, when tunnel portal concrete is removed, the integral stability of soil mass can be ensured, seepage damage caused by a fine sand stratum is prevented, muddy water pressure during tunneling of the shield machine can be balanced, and is prevented from breaking through the peripheral soil mass of the tunnel portal, and the shield arrival is carried out safely and smoothly.

The present invention discloses one kind of heat resistant anticorrosive composite polyphenylene sulfide epoxy paint and its preparation process. The anticorrosive paint consists of primer, finishing paint and intercoat paint. The primer consists of polyphenylene sulfide, epoxy resin, glass scale and cyanamide dimmer. The finishing paint consists of polyphenylene sulfide, epoxy resin, silicon carbide, 4, 4'-diamino diphenyl sulphone and cyanamide dimmer. The intercoat paint consists of polyphenylene sulfide, epoxy resin, silicon carbide, glass scale, dihydrazide sebacate and 4, 4'-diamino diphenyl sulphone. The anticorrosive paint produces no sag, and can form homogeneous and smooth coating with excellent physical and chemical performance, high heat resistance, high corrosion resistance, high impact strength, and high insulating performance.

The invention discloses a figuration phase change material based on tetradecane. The figuration phase change material is formed by mixing and processing the tetradecane with the mass percentage between 30 and 80 percent and the balance being a polymer framework material, wherein the polymer framework material is one or a combination of polyethylene (PE), styrene-butadiene-styrene copolymer (SBS) or styrene-isoprene-styrene copolymer (SIS). The invention has the tetradecane absorbed and/or wrapped in the specific polymer material as a framework. Because the polymer material as the framework can not be deformed in the working temperature range (20 below zero to 40 DEG C for example) of the tetradecane, the shape of the material can be kept, and the problems about collapse or flowing and leakage can not occur. Therefore, the obtained figuration phase change material can be widely applied to the low-temperature preservation and transportation of medicines, foods and the like.

The invention relates to a function-restorable assembly type wave web beam-column composite joint connection device and belongs to the technical field of structural engineering. The function-restorable assembly type wave web beam-column composite joint connection device is composed of a round steel pipe column with a cantilever beam section, a wave web I-shaped composite beam section and a connecting device between the round steel pipe column with the cantilever beam section and the wave web I-shaped composite beam section. Welding of the joint connection device and assembly of the wave web I-shaped beam section and a composite floor are finished in a factory; weld seam and member qualities are easier to control; the round steel pipe column with the cantilever beam section and the wave web I-shaped composite beam section are assembled only through high-strength bolts and connection plates on site, so that the construction speed and quality are greatly improved; the wave web I-shaped composite beam section can be built on the lower flange connection plate of the round steel pipe column with the cantilever beam section, so that the hoisting difficulty is lowered and on-site assembly and positioning are easy; and through specific design, the structure destroyed positions can appear in the positions of energy dissipation members such as the easy-to-replace high-strength bolts and lower flange connection plate under the action of earthquake load, so that post-earthquake restoring is facilitated, and the function-restorable assembly type wave web beam-column composite joint connection device is adapted to development demands of a function-restorable assembly type steel structure.

The invention discloses an artificial nasolacrimal duct which is simple in structure, capable of being led in and led out conveniently, and capable of avoiding repeated operations. The artificial nasolacrimal duct comprises an inner tube which is made of silica gel materials and a locating piece. The locating piece is arranged on the outer wall of the inner tube, and the artificial nasolacrimal duct can be supported by the locating piece to be located in a pipeline of a human body nasolacrimal duct. The inner tube is of a splicing structure of multiple channels and multiple sections. The locating piece either can be a section of spiral band which is made of degradable and expandable materials and arranged on the outer wall of the inner tube or can be an outer pipe which is arranged on the outer wall of the inner tube and made of degradable and expandable materials. The locating piece can further comprise a locating groove and an absorbable line. The spiral locating groove is formed in the outer wall of the inner tube, the absorbable line is wound in the locating groove, the maximum external diameter of the wound absorbable line is slightly larger than the external diameter of the inner tube, so that the absorbable line is in direct contact with the inner wall of the human body nasolacrimal duct, and thus the effect that the artificial nasolacrimal duct is located in the human body nasolacrimal duct through the absorbable line can be achieved.

The double spherical shock absorbing and insulating bearer for railroad bridge includes an upper bearing plate, a middle bearing plate and a lower bearing plate superposed successively and sliding teflon plates set between bearing plates. The lower bearing plate has fixed shearing force member. The middle bearing plate has an upper spherical surface in small curvature radium for connection to the upper bearing plate through spherical spin friction, and a lower spherical surface in great curvature radium for connection to the lower bearing plate through spherical sliding friction. In addition, there are also a top basin on the upper bearing plate and a sliding teflon plate in between. the present invention has obvious shock absorbing and insulating effect, easy control and regulation, capacity of ensuring structural safety and lowering engineering cost, and other features.

The invention discloses an A2.0 B04 grade autoclaved aerated concrete block prepared from quartz eroded sand. The A2.0 B04 grade high-performance autoclaved aerated concrete block is prepared from quartz eroded sand, cement, quick lime, industrial waste phosphogypsum, aluminum paste and water. The dry density of the concrete block is 415kg/m<3>, the cube crushing strength average value is 2.1 MPa, the single unit minimum value is 1.9 MPa, the ratio of splitting tensile is 0.19, the frost quality loss is 3.7%, the frost strength is 1.7 MPa, the heat conductivity coefficient (dry state) is 0.116 W/(m.K), the dry shrinkage value (standard value) is 0.22 mm/m and the percent of pass is greater than 98%. The raw material processing method is reasonable, the formula calculation is scientific, the production process is simple and the production waste can be recycled. The concrete block is a novel energy-saving and environmentally-friendly wall material and is suitable for industrial process.

The invention belongs to the technical field of macromolecular cellular materials, provides an isopolymolybdate organic-inorganic hybrid compound and a preparation method thereof and aims to solve the problem of diminishing or complete losing of porous channels due to proneness to entanglement networks in construction of cellular materials. The isopolymolybdate organic-inorganic hybrid compound with a molecular formula being C36H48N16O27Mo8Cu belongs to a monoclinic crystal system. The preparation method includes: synthesizing BBTZ; synthesizing ionic liquid [Bmin]Br; mixing (NH4)6Mo7O24.4H2O, CuCl2.2H2O, BBTZ and the ionic liquid [Bmin]Br at the room temperature, regulating pH with HCl, transferring to a reaction kettle with a polytetrafluoroethylene liner, keeping for 5 days at 160 DEG C, and cooling to the room temperature at a speed of 10 DEG C.h<-1> to obtain the compound. The isopolymolybdate organic-inorganic hybrid compound and the preparation method thereof have the advantages of technical simplicity, high repeatability, high yield, mild process conditions, stable crystal structure, availability for cation exchange, excellent thermal stability and chemical stability and applicability as high-temperature materials.

The invention discloses a 3D printing spray head device. The 3D printing spray head device comprises an extruding mechanism, a feeding mechanism and a heating mechanism. The extruding mechanism comprises a material guide cylinder which is positioned and mounted through an upper fixing plate and a lower fixing plate. A feeding screw mounted through a rolling bearing is arranged in the material guide cylinder. The upper end of the feeding screw extends out of an upper cylinder opening of the material guide cylinder and is connected with a motor output shaft mounted on the upper fixing plate. A detachable spray head is mounted on a lower cylinder opening of the material guide cylinder. The feeding mechanism comprises a feeding pipe. The feeding pipe communicates with a feeding opening in a material guide cylinder body. The heating mechanism comprises air heaters arranged on the lower fixing plate. Air blowing openings of the air heaters all face a spray nozzle of the spray head. The 3D printing spray head device is simple in structure, good in extrusion effect, uniform to heat and capable of quickly curing a model, and the spray head is not likely to be blocked.

The invention belongs to the technical field of repairing of blast furnace linings and particularly relates to a wet-process spray-coating material for a lining of an upper shaft of a blast furnace, an application of the wet-process spray-coating material and a method for repairing the lining of the upper shaft of the blast furnace. The spray-coating material contains the following ingredients in percentage by weight: 4-8wt% of electrically-fused mullite with the granularity of 5mm to 8mm, 10-20wt% of electrically-fused mullite with the granularity of 3mm to 5mm, 15-25wt% of electrically-fused mullite with the granularity of 1mm to 3mm, 15-25wt% of electrically-fused mullite with the granularity of 0.088mm to 1mm, 25-35wt% of electrically-fused mullite with the granularity not greater than 0.088mm, 1-4wt% of silica micropowder, 5-10wt% of activated alumina micropowder and 0.3-0.5wt% of admixture. The service life of the spray-coating material can reach 24 months or more and is greatly prolonged compared with those of spray-coating materials in the prior art; and the spray-coating material has the characteristics of long construction time, excellent medium-temperature physical properties, short baking time and long one-time repair service life, the cost is lower, and the resistance to fracture caused by temperature changes is higher.

The invention discloses an N(2)-L-alanyl-L-glutamine preparation for injection and a preparation method thereof. The preparation is prepared through directly preparing a liquid with a raw material N(2)-L-alanyl-L-glutamine, freeze-drying, and carrying out separate packing. The method comprises the following steps: (1) taking the raw material N(2)-L-alanyl-L-glutamine, adding water for injection, and fully stirring to completely dissolve N(2)-L-alanyl-L-glutamine; (2) adding needle active carbon to a solution obtained in step (1), fully stirring, filtering to decarburize, and carrying out germ filtering through passing through a filter with a diameter of 0.2 [mu]m; (3) putting a filtrate obtained in step 2 into a sterilized freeze-dried disc, loading the disc into a cooling chamber of a freeze dryer, and carrying out pre-freezing, vacuumizing, heating, sublimation drying, desorption drying, and vacuum break to end freeze-drying; and (4) accessing high purity nitrogen for drying and degerming, taking out of the chamber, carrying out asepsis packing, tamponading, and capping. So N(2)-L-alanyl-L-glutamine for injection is obtained.

The invention relates to a paper bag processing device and a paper bag processing method. An upper bag body mechanism comprises a frame and a bag body storing mechanism, wherein the bag body storing mechanism comprises a support plate which is arranged obliquely and of which the upper end is connected together with the frame, a blocking-pushing frame positioned on the support plate, and a driving mechanism for driving the blocking-pushing frame to move along the inclination direction of the support plate; a bag body transferring mechanism, a bag body opening and loading mechanism and a bag opening and holding frame are arranged on the frame; the bag body transferring mechanism is positioned between the bag body storing mechanism and the bag body opening and loading mechanism; the bag opening and loading mechanism is positioned between the bag body transferring mechanism and the bag body opening and holding frame. According to the upper bag body mechanism, a bag body plate on which a hand rope is to be arranged can be changed into an open bag body, and the bag body is kept in an open state, so that the problem of limitation on realization of automatic installation of the hand rope since a mechanism for changing the bag body on which the hand rope is to be arranged to the open state and keeping the bag body in the open state is unavailable is solved.

The invention relates to a freeze-drying composition of a posaconazole prodrug and a preparation method and application of the freeze-drying composition of the posaconazole prodrug. The freeze-drying composition has the advantages that the freeze-drying composition is high in water solubility, and safety of the freeze-drying composition is guaranteed due to the fact that cyclodextrins auxiliary materials need not to be added during the preparation of the freeze-drying composition; the freeze-drying composition is suitable for being used for treating various amphotericin-intolerant or refractory adult invasive fungal infections; the freeze-drying composition is used as a preventive drug for high-risk patients, the freeze-drying composition is applicable to patients above 13 years old and with impaired immunity and especially applicable to patients who have graft versus host disease (GVHD) after hematopoietic stem cell transplant, patients with leukemia and patients with long-term leukopenia due to chemotherapy; compared with control drugs such as fluconazole and itraconazole, the freeze-drying composition can effectively prevent invasive aspergillosis and can lower the mortality related to the invasive fungal infections.

The invention provides a production method of instant fruit and vegetable shortcakes. The method comprises the following steps: pre-processing vegetable and fruits, respectively crushing and pulping, mixing the above obtained fruit pulp with the above obtained vegetable pulp, adding inulin, natural fructose syrup, white granulated sugar and a natural lemon juice, blending, homogenizing to obtain a mixture, pouring the mixture into a die supporting box, and carrying out vacuum freeze drying to obtain the instant fruit and vegetable shortcakes. The fruit and vegetable pulps and other raw materials are mixed according to a specific ratio and undergo vacuum freeze drying to make the fruits and vegetables form a novel and instant fruit and vegetable shortcake food, so the kind of the fruit and vegetable products in the market is enriched. The fruit and vegetable shortcakes made through the production method maximally reserve nutritional components in the fruits and vegetables without loss of the nutritional components or destroys of the color or the taste, and solve the problem of flavor change of the fruit and vegetable fruits, induced by present production technologies; and the fruit and vegetable shortcakes produced through the method also have the advantages of low water content, light weight, easy storage, and convenient transportation and carrying.