160results about How to "Guaranteed dense" patented technology

The invention discloses a nickel and zinc soft magnetic ferrite material and a preparation method thereof. A high-temperature-resistant soldering tin, nickel and zinc soft magnetic ferrite material comprises the following components in parts: 45-50mol percent of Fe2O3, 26-32 mol percent of ZnO, 17-21 mol percent of NiO and 4-8 mol percent of CuO, and also comprises the following components in parts: 0.2-0.5 wt percent of auxiliary material A and 0.1-0.2 wt percent of auxiliary material B, wherein the auxiliary material A is one or two of Bi2O3, SiO2 and Ta2O5, and the auxiliary material B is one or more of TiO2, ViO5 and Nb2O5. The high-temperature-resistant soldering tin, nickel and zinc soft magnetic ferrite material has the characteristics of high frequency, high magnetic conductivity,high Bs and TC (Temperature Curie).

The invention provides a casting method for an impeller made of a super duplex stainless steel 5A material. The method comprises the steps of preparation of a casting mould and a sand core, specifically, the casting mould and the sand core are prepared in the manner that alkaline phenolic resin is added to crude sand, the casting mould is provided with an impeller cavity for storing the sand core, and a dead head is internally provided with a ceramic foam filter; casting and pouring; and sand shakeout and heat treatment of a heat-filling furnace, and an impeller finished product is obtained. The temperature ranges of precipitation of brittle phases including Eta, Chi and Sigma can be avoided, precipitation of the brittle phases by an impeller casting structure is avoided, crack defects of an impeller casting are overcome fundamentally, density of the casting structure can also be guaranteed, and the yield rate of a casting finished product can be increased to 96% or above; and meanwhile, the casting production cost is greatly lowered as the technological yield is increased, and the heat-filling furnace process is implemented.

The invention relates to an expanding agent, a post-tensioning prestressed concrete porelike grouting agent and a grouting material. The expanding agent comprises a nitrogen expanding agent, gypsum and magnesium oxide at a mass ratio of (0.3-0.6):30:(3-15). The post-tensioning prestressed concrete porelike grouting agent comprises the following components in parts by mass: 5-12 parts of water reducing agent, 0.3-0.7 parts of stabilizing agent, 18-60 parts of mineral admixture, 0-15 parts of early strength agent, and 35-50 parts of expanding agent. The invention further provides the post-tensioning prestressed concrete grouting material which comprises portland cement, water and the grouting agent, wherein the mass ratio of the grouting agent to the portland cement is (10-20):(80-90), and a range of the water-binder ratio is 0.26-0.28. In a grouting material slurry hardening process, a continuous and stable expanding effect is generated, so that the grouting material can be tightly bonded with prestressed reinforcements and structural concrete, and the effective transmission of a stress is ensured.

Disclosed is a roll gap setting method of a wrapper roller in a recoiling machine. The method belongs to the technical field of control. A temperature measuring instrument is arranged at an inlet of a recoiling machine set. An initial roll gap set value static table is established in a host computer. According to characteristics of strip steel in different specifications, initial roll gap set values of different wrapper rollers are set. When the host computer receives a steel-biting signal, three initial roll gap set values of the wrapper roller are searched in the initial roll gap set value static table of the wrapper roller and then the three initial roll gap set values are downwardly sent to a recoiling basic automatic computer of the recoiling machine. According to an actual recoiling temperature, the recoiling basic automatic computer carries out a corresponding compensative correction to roll gap set values. Influences of factors such as a recoiling temperature, a width of the strip steel and a thickness of the strip steel on tightness degree of a rolling layer of an inner circle of a steel roll can be fully considered. All of the influences of the factors on the tightness degree of the rolling layer of the inner circle of the steel roll can be considered. Inner circles of various steel rolls are ensured to be compact and slipping accident of the recoiling machine can be effectively reduced. In addition, introduction of thick-specification stripe steel can be improved and steel-waste accident is reduced.

The invention discloses a design method for a grouting channel of prefabricated concrete vertical members. The design method comprises the following steps that the upper-section prefabricated concretevertical member and the lower-section prefabricated concrete vertical member are prefabricated; a first bottom key groove, a second bottom key groove, an L-shaped grouting pipeline and an L-shaped observation pipeline are prefabricated in the upper-section prefabricated concrete vertical member; the first bottom key groove is connected with the L-shaped grouting pipeline, and the second bottom key groove is connected with the L-shaped observation pipeline; steel bar grouting sleeves are arranged on the lower portion of the upper-section prefabricated concrete vertical member and communicate with a horizontal joint of the upper and lower prefabricated members; and a grouting material sequentially enters the second bottom key groove, the horizontal joint of the upper and lower prefabricatedmembers and the first bottom key groove from the L-shaped grouting pipeline, is discharged form slurry outlets of the steel bar grouting sleeves firstly to block the slurry outlets of the steel bar grouting sleeves, and then is discharged from the L-shaped observation pipeline to block the L-shaped observation pipeline and the L-shaped grouting pipeline.

The invention provides a method for casting a swashplate of an automobile air-conditioning compressor and a mould thereof. The method comprises the steps: squeezing press is exerted to melt inside a feed room so as to cause the melt to flow into a die cavity stably from the side surface through a pouring channel; when the die cavity is filled with the melt, pressure-keeping press is exerted to the melt from one end vertical to the die cavity, feeding pressure is exerted to the center of the melt from the other end vertical to the die cavity before the melt is completely solidified and the pressure is canceled after maintained for 4-10s; the squeezing press is canceled after the melt at the connection part of a pouring channel and the die cavity is solidified; the pressure-keeping press is canceled after the melt is completely solidified; then a cast is fetched out by opening the die. The mould provided by the invention essentially comprises the sequentially communicated feed room, pouring channel and die cavity; the top and the bottom of the die cavity are respectively provided with a channel inside which a punch used for providing pressure to the top and the bottom of the die cavity is arranged. The aluminum alloy swashplate cast by the invention is compact and has small content of inner impurities, good shaped appearance, fine structure and no bubble in thermal treatment.

The invention provides a full automatic hydraulic building block forming machine without shock excitation, which comprises a frame, a workbench, an upper die, a lower die, a mould emptier, a feeding mechanism and a compaction mechanism. The compaction mechanism comprises a hydraulic cylinder, a hydraulic cylinder push frame, a bar chain force increasing and pressurizing mechanism. The hydraulic cylinder arranged on the frame passes through the frame; the lower end of the hydraulic cylinder is provided with the hydraulic cylinder push frame which is fixed. The lower end of the hydraulic cylinder push frame is provided with the bar chain force increasing and pressurizing mechanism. The lower end of the bar chain force increasing pressurizing mechanism is fixed with an upper templet. The invention provides a full automatic hydraulic forming machine of low power and large pressure without shock excitation, noise or a carrier for high strength bearing building blocks and interlocking building blocks.

The invention discloses a construction method of mass concrete of high-rise building foundations. According to the construction method, continuous construction is adopted for concrete construction, concrete is subject to segmental and layered casting and mechanical vibrating, and the temperature and the casting time are strictly controlled. The construction method is simple in technique, high in site construction efficiency, reliable in quality, short in construction period and low in labor intensity, the quality after construction reaches the design demands, and the thickness of casting layers is strictly controlled. Vibrators are arranged at multiple casting points to ensure density of the concrete. The opening temperature and the molding temperature of the concrete are strictly controlled so that shrinkage and closing of the concrete are effectively ensured. The concrete is vibrated in a fast inserting and slow stirring mode during casting so that holes caused by mixing of air during concrete casting are effectively prevented.

The invention discloses a concrete construction method for a big-gradient sloping roof. At first, a bottom layer formwork module 2 of the big-gradient sloping roof is installed according to needs, roof panel steel bars are bound according to construction drawings and standard requirements, then sprayed concrete construction is carried out on the big-gradient sloping roof panel 1, the big-gradient sloping roof panel 1 comprises the sloping roof formwork module 2 and pre-buried L-shaped pulling ribs 3, the formwork module 2 is machined in advance to be formed and to be hoisted to a full space bearing frame 4, concrete is continuously sprayed and constructed at one time, construction quality of the concrete can be visually observed, and it is guaranteed that the interior of the concrete is dense; after roof concrete is renovated by means of cement mortar with the same proportion of the roof concrete through cleaning of dross on the surface layer, the concrete is square in appearance size, the exterior of the concrete is flat, and the interior of the concrete is solid.

The present invention discloses a heat preserving wall concrete aggregate grain diameter selecting and pouring method, which comprises the following steps: a, preparing a concrete with separable aggregate grain diameters, wherein, the aggregate grain diameters of the concrete adopt subsection continue preparation, the pebble with grain diameter of 5 to 10 mm is 30 to 35% of the total amount of the pebble, and the pebble with grain diameter of 10 to 30 mm is 65 to 70% of the total amount of the pebble; b, conveying the concrete with separable aggregate grain diameter to a pouring working surface by a set of concrete conveying equipment, separating the concrete by using a concrete aggregate grain diameter selecting and separating device, conveying the concrete with small grain diameter aggregate to a shuttering with small thickness and pouring the concrete to a protection wall, and conveying the concrete with big grain diameter aggregate to a shuttering with large thickness and pouring the concrete to a shear wall, and the two pouring processes are carried out at the same time; c, vibrating the concrete at the two sides to guarantee that the concrete is compact. The invention has convenient construction, easy operation, low cost and excellent pouring effect, is suitable for the construction of the home building and office building in various forms in the town, and has good society and economic benefits.

The invention provides an environment-friendly water permeable brick as well as a compression forming mould and a preparation method for preparing the environment-friendly water permeable brick. The water permeable brick is formed by a water permeable brick surface layer and a water permeable brick base layer, wherein materials of the surface layer mainly comprise sand with the particle size being 10 to 20 mesh and cement; materials of the base layer mainly comprise large gravel with the particle size being 3 to 8mm and cement. The method specifically the steps of adding the materials into two stirring machines respectively, adding other materials of corresponding formulas for evenly stirring, then compressing by a brick compression forming machine, distributing the base layer materials twice and the surface layer materials once in a lower mould hollow part of the compression forming mould, performing shaking compression for 2 to 3s after each time of material distribution, thus preparing a formed green brick, and then performing curing to form the water permeable brick. A dry-press forming process is adopted to prepare the water permeable brick, so that the production cost and the energy consumption are reduced; the prepared water permeable brick has good water permeability, abrasion performance, skid resistance and crushing resistance.

The invention relates to a small concrete compaction and curing slowing device used for an experiment. The device includes a vibration mechanism, a centrifugal mechanism, a curing slowing mechanism, amaterial loading and unloading mechanism and a clamping mechanism; the vibration mechanism is located on the outermost layer of the device, the centrifugal mechanism is located on the middle layer ofthe device, the curing slowing mechanism is located on the secondary inner layer of the device, and the material loading and unloading mechanism is located on the innermost layer of the device. The invention further discloses a concrete compaction and curing slowing method by means of the concrete compaction and curing slowing device. According to the small concrete compaction and curing slowingdevice used for experiment and its implementation method, solid compaction and curing slowing functions are both achieved, there is a big difference between the existing experimental method and corresponding instruments and the small concrete compaction and curing slowing device and its implementation method, the characteristics such as low noise, low loss, low splashing, disassembly, matching, uniform sample discharge and compaction in the compaction process of concrete are taken into consideration, and the device is very high in feasibility and practicability.

The invention relates to a lining wall concrete placement top-down method based on an underground diaphragm wall. The lining wall concrete placement top-down method comprises the following steps: (1) the underground diaphragm wall is constructed; (2) a foundation floor slab is constructed; (3) an upper floor slab is constructed; (4) a formwork is erected, an upper layer of lining wall concrete is poured, a steel pipe is pre-buried every 2-3 meters in the upper layer of lining wall concrete, and the lower end of each pre-buried steel pipe is arranged on the top of an inverted groove in the lower portion of an upper lining wall which is formed in a pouring mode; (5) a lower lining wall formwork is erected, wherein the formwork is directly connected with the upper lining wall from the bottom surface of the foundation floor slab and is mounted in a closed mode, pump truck concrete delivery pipes used for pouring a lower layer of lining wall concrete are inserted in the pre-buried steel pipes to conduct pouring continuously, the concrete is compacted by means of vibration, a micro-expanding agent is added into the concrete, and then pouring of the lining wall concrete is completed. The lining wall concrete placement top-down method based on the underground diaphragm wall is simple in operation process, can sufficiently guarantee that the concrete poured in the lining walls later is compact, accelerates construction progress, and improves construction efficiency.

The invention discloses a rib-grouting body interface mechanical property testing system and method, and solves the problem that the radial deformation of a test piece cannot be accurately measured inthe prior art. The invention has the beneficial effect of improving the accuracy of obtaining the radial deformation of the rib-grouting body interface. The specific scheme is that the system comprises a test piece container used for containing the test piece, wherein the test piece is arranged in the test piece container; an extensometer is arranged between the test piece and the test piece container, an anchor rod of the test piece penetrates through the test piece container, and a loading device provides confining pressure for the test piece and provides an acting force for the anchor rod.

A Zr, Sr composite micro-alloyed and Mn-alloyed high-strength Al-Si-Cu cast aluminum alloy and a preparation method thereof, characterized in that the aluminum alloy is mainly composed of aluminum, silicon, copper, manganese, magnesium, Composed of zinc, zirconium, strontium and iron, wherein the mass percentage of silicon (Si) is 8.28-8.41%, the mass percentage of copper is 2.06-2.29%, the mass percentage of manganese is 0.472-0.483%, and the mass percentage of zirconium is 0.187 ~0.192%, the mass percentage of strontium is 0.0334~0.0378%, the mass percentage of iron is 0.142~0.147%, and the balance is aluminum and a small amount of impurity elements. The as-cast structure of the aluminum alloy of the present invention is dense, and the average value of the unnotched impact toughness at room temperature measured by the as-cast alloy is 18.386366 J/cm2, and its tensile strength is 238.85 MPa, elongation is 7.06%, and the temperature is 37 ° C in 3.5% NaCl aqueous solution. The average uniform corrosion rate is 0.324870443 mm/y, which can meet the manufacturing needs of large complex thin-walled high-strength cast aluminum alloy structural parts.

The invention discloses a great-width multi-hole lightweight core formwork which comprises a lightweight core formwork laid on a to-be-poured concrete hollow floor bottom formwork in advance, wherein pouring areas used for pouring concrete hollow floors are formed between the lightweight core formwork and the bottom formwork and between adjacent lightweight core formworks; a supporting piece used for supporting the lightweight core formwork is arranged between the lightweight core formwork and the bottom formwork; a notch used for enhancing the connection strength of concrete in the pouring areas is formed in the lightweight core formwork; and pouring holes which penetrate through the upper and lower surfaces of the lightweight core formwork and inject concrete into the pouring areas and vibrating holes for performing vibrating compaction on the concrete in the pouring areas are respectively formed in the lightweight core formwork. According to the invention, the problems thin concrete even cavities occur around the central holes of the lightweight core formwork after penetration holes are reserved in the middle of the great-width multi-hole lightweight core formwork and the like are solved, the construction quality is ensured, and the economic benefits are improved.

The invention discloses a method for solving the saltpetering problem of a water permeable brick. A specially-made water permeable brick is included, the specially-made water permeable brick comprisesa water permeable surface layer and a water permeable base layer, and the water permeable surface layer and the water permeable base layer are tightly combined into a whole; the water permeable baselayer comprises internal aggregate, and cement, a reinforcing agent and cementing material slurry which are mixed and uniformly coat the surface of the internal aggregate, wherein the internal aggregate, the cement, the reinforcing agent and and the cementing material slurry are mutually bonded; the cementing material slurry in the water-permeable base layer comprises a hydrophilic binder; and thewater-permeable surface layer comprises an external aggregate, and cement, a water repellent, a pigment mixture, an enhancer and cementing material slurry which are mixed and uniformly coat the surface of the external aggregate, and the cementing material slurry comprises a hydrophilic binder, a hydrophilic resin binder and an inorganic binder. The method for solving the saltpetering problem of the water permeable brick achieves the effects of good water permeability, low cost and capability of solving the saltpetering problem of the brick.