159results about How to "Maintain strength" patented technology

The invention relates to the technical field of building materials, and particularly discloses high-strength lightweight concrete containing hollow glass beads and a preparation method of the high-strength lightweight concrete. The high-strength lightweight concrete containing the hollow glass beads is prepared from cement, fly ash, carbon fiber grafted hollow glass beads, lightweight sand, deionized water, polypropylene fiber grafted rubber particles and a water reducing agent according to the mass ratio of (58-75): (25-38): (45-65): (20-40): (42-55): (35-55): (5-12) through mixing, mold filling, vibration molding, covering and demolding. The addition amount of the hollow glass beads is strictly controlled, the influence on the overall strength of the concrete is avoided, the density and weight of the concrete are reduced due to the addition of the light sand and the hollow glass beads, the compactness and integrity of the concrete are improved due to the synergistic effect of the two added fibers, and the raw materials have excellent cohesiveness; the concrete can effectively absorb and disperse stress, and has the advantages of excellent strength, light weight, good durability and excellent comprehensive performance.

The embodiment of the invention provides a wind generating set rack design method and system, and belongs to the technical field of wind power. The method comprises the following steps: S10) carrying out topological optimization on a topological region of a rack model, and checking the rack model after topological optimization; s20) identifying and constructing a transfer matrix of stress and load of each key part; s30) executing a genetic algorithm based on a load updating result and the transfer matrix to obtain optimized geometric parameters of each key part; s40) on the basis of the optimized set parameters of each key part, updating a topological region optimization result of the rack, and checking the rack model after updating topological optimization; and (S50) repeating the step (S20) to the step (S40) until the geometric parameters, meeting the design requirements, of all the key parts are obtained, and outputting a corresponding rack design plane.According to the scheme, the lightweight design effect of the rack is improved, and the safety and economical efficiency of the rack are guaranteed.

The invention discloses an alloy wear-resistant sliding block and a preparation and production process, and belongs to the technical field of alloy sliding blocks. A position hole is formed in an upper base body, and position grooves are formed in the periphery of the position hole. The included angle between the position holes and the vertical axis is 17-35 degrees, an L-shaped pressing block is installed on the outer side of the arc-shaped body, and a curve part and a bevel part are arranged in the side direction of the L-shaped pressing block; the end parts of the curve parts are welded on the longitudinal water beam; and an anti-bending strip is arranged in the multiple groups of curve parts and is welded with the L-shaped pressing block. The alloy comprises the following components in parts by weight: 2 to 3 parts of C, 10 to 15 parts of Fe, 3 to 5 parts of S , 2 to 3 parts of Al, 15 to 19 parts of Cr, 3 to 5 parts of T , 0.3 to 1.5 parts of Nb, 6 to 9 parts of Co, 0.1 to 0.2 part of P and the balance of N and trace residual impurities, wherein REC is set to be equal to (A < l > + S + T + Cr) / 3N + (Nb + T ) / 2 (N + Cr), and REC is larger than or equal to 0.16 and smaller than or equal to 0.31. The technical problems that longitudinal expansive force is generated in the heat-resistant sliding block due to heating, cracks are generated on the surface of the longitudinal water beam under the action of tensile force, and then breakage is caused are solved.

The invention provides an NC30Fe high-chromium nickel-based alloy pierced billet as well as a preparation method and application of the NC30Fe high-chromium nickel-based alloy pierced billet. The preparation method comprises the following steps: firstly, heating an NC30Fe high-chromium nickel-based alloy tube blank to a specific charging temperature, and perforating by utilizing a hot cross rolling perforation process; in the punching process, it is ensured that the dimensional tolerance and eccentricity of a pierced billet meet the requirements by strictly controlling the roller distance, the top temperature and the extension coefficient; and then, quenching treatment is carried out on the pierced billet subjected to perforation, so that the grain size is controlled to be within the range of grade 3 to grade 7, and the high-temperature strength and creep resistance of the material are improved. According to the preparation method disclosed by the invention, through introduction of a hot cross piercing process, the problems of more surface defects, large eccentricity and difficulty in grain control caused by a traditional hot extrusion process are solved, the yield is increased to 93% or above, and the surface smoothness and the dimensional precision are remarkably improved. The pierced billet is suitable for preparation of high-temperature corrosion-resistant and high-precision nickel-based alloy pipes in the fields of petroleum, chemical engineering, aerospace and the like, and has high application value.

The invention discloses solidified soil prepared from solid waste and a preparation method of the solidified soil, and relates to the technical field of constructional engineering materials. According to the solidified soil prepared from the solid waste, the self-made anti-dispersing agent and the composite curing agent are added, the self-made anti-dispersing agent is prepared by introducing graphene oxide to the surface of pretreated aramid fiber and then generating nano silicon dioxide on the surface in situ, the self-made anti-dispersing agent enters solidified soil components, dispersion is reduced, and therefore the strength of the solidified soil is kept; the composite curing agent comprises modified glass fiber reinforced plastic, sulphoaluminate cement, Portland cement and gypsum powder, the modified glass fiber reinforced plastic is prepared by carboxylating glass fiber reinforced plastic and then coating the carboxylated glass fiber reinforced plastic with a sulfydryl cross-linked polymer, and the modified glass fiber reinforced plastic enters the structure of the cured soil, so that shrinkage deformation is prevented, and the curing strength is enhanced.

The invention relates to the technical field of aluminum alloy strip preparation, in particular to an aluminum alloy strip and a preparation method thereof. The invention relates to an aluminum alloy strip which consists of the following elements in percentage: 3.85 percent to 4.85 percent of Cu, 1.14 percent to 1.89 percent of Mg, 0.35 percent to 0.88 percent of Mn, 0.01 percent to 0.48 percent of Fe, 0.01 percent to 0.5 percent of Si, 0.01 percent to 0.25 percent of Zn, 0.01 percent to 0.15 percent of Ti and the balance of Al. The composition proportion of the aluminum alloy strip is optimized, the compactness of the aluminum alloy strip is improved by increasing the adding proportion of Cu, Mg and Mn, gaps in an aluminum alloy strip matrix are filled through mixed adding of Cu, Mg and Mn, the compactness of the material is improved, and the mechanical property of the aluminum alloy is further improved in the alloying process.

The invention provides a cross-shaped moisture absorption and sweat releasing polyester fiber and a preparation method thereof, and relates to the technical field of polyester fiber production. The cross section of the cross-shaped moisture absorption and sweat releasing polyester fiber is in a cross shape, the cross-shaped moisture absorption and sweat releasing polyester fiber comprises four ribs evenly distributed in the circumferential direction and a cross-shaped through hole located in the center, a plurality of micropores are distributed in the surfaces of the ribs, and the average pore size of the micropores is 0.1-0.5 micrometer; secondly, the polyester fiber is composed of hydrophilic modified polyester, hydrophilic polyester master batches containing calcium carbonate powder and a moisture absorption and sweat releasing agent according to the mass percentage of 70-85: 10-20: 5-10, and the moisture absorption and sweat releasing agent is a polyether ester block copolymer. According to the cross-shaped moisture absorption and sweat releasing polyester fiber, the cross section is cross-shaped, the cross-shaped moisture absorption and sweat releasing polyester fiber has a large specific surface area, moisture diffusion and evaporation are facilitated, the moisture absorption performance of the fiber can be improved through the micropores in the surfaces of the beads, air circulation is facilitated through the cross-shaped through hole in the center, and the sweat releasing effect is improved.

The invention relates to the technical field of autoclave forming dies, and discloses a bullet train protection plate autoclave forming die which comprises a chassis and a bottom plate which are integrated, the bottom face of the chassis is of a grid structure, the top of the chassis is connected with the bottom plate through a supporting structure so that the bottom plate can be communicated with the outside, and a protection plate material containing groove is formed in the top face of the bottom plate. A plurality of through holes are formed in the side face of the chassis so that the through holes in the side face can communicate with the grid structure. Uniform distribution of heat is facilitated, stress concentration is reduced, the heating performance and the heat dissipation performance are improved, and sufficient heat stability and heat conduction coefficient are achieved, so that the production cost is reduced; through combination of a grid structure and a protection plate mold containing groove, the self weight is reduced so as to reduce the production and transportation cost, meanwhile, the strength and rigidity are kept, material use is optimized, reinforcing ribs are combined on the edge of the mold, stability and durability are improved, and fatigue and deformation risks are reduced; the net rack design facilitates heat dissipation, heat stability is improved, forming precision is ensured, and product defects are reduced.

The invention relates to the technical field of cement additives, in particular to a powder composition for cement addition and a preparation process of the powder composition, modified sodium lignin sulfonate serves as an important component of the powder composition, dispersity and stability of sodium lignin sulfonate are effectively improved through sulfomethylation and condensation reaction, and in cement concrete, the powder composition has the advantages that the dispersity and stability of sodium lignin sulfonate are improved; the modified sodium lignin sulfonate can be adsorbed on the surfaces of cement particles to form a protective film, friction force and resistance among the cement particles can be reduced, so that the fluidity of the concrete is improved, meanwhile, a sulfomethylation structure of the modified sodium lignin sulfonate can chemically react with calcium ions in the cement to form stable calcium salt, the stability of the concrete is further enhanced, and the service life of the concrete is prolonged. According to the powder composition for cement addition and the preparation method of the powder composition, the performance of cement concrete can be remarkably improved through well-designed components, and the composition has excellent flowability, anti-permeability, anti-freezing property, water resistance, mildew resistance and rust resistance.

The invention relates to the technical field of structural damping devices, and particularly discloses a prestressed shape memory alloy damper which comprises a yield type assembly and two viscous type assemblies, and the two viscous type assemblies are fixedly connected to the two sides of the yield type assembly; the yield type assembly comprises an energy dissipation core plate, a plurality of prestressed inclined struts, a first supporting plate, a second supporting plate, an upper connecting plate, a lower connecting plate, a pre-tightening bolt, a first base plate, an angle plate, a restraining plate and a second base plate, and the prestressed inclined struts are fixedly connected to the front side and the rear side of the energy dissipation core plate correspondingly. According to the damper, the defect that the shape memory alloy material is high in yield strength and cannot rapidly enter energy consumption prior to a main body structure is overcome by adopting a pre-tightening force mechanism, meanwhile, the advantages of high ductility and high fatigue of the shape memory alloy material are exerted, and the damper has the anti-seismic and shock-absorbing effect of multi-coordination energy consumption.

The utility model relates to the technical field of iron removal equipment, in particular to a self-cleaning rotary iron remover which comprises a rack and an iron removal mechanism, the iron removal mechanism is mounted on the rack, the iron removal mechanism comprises a magnetic attraction assembly and a scraping assembly, the magnetic attraction assembly comprises two fixing discs, a plurality of magnetic bars and a driving part, and a left vertical plate and a right vertical plate are fixedly connected to the rack; the two fixing discs are arranged close to the left vertical plate and the right vertical plate respectively, the multiple magnetic bars are evenly distributed in the circumferential direction of the fixing discs and arranged in the length direction of the rack, the two ends of each magnetic bar are fixedly connected with the two fixing discs respectively, and the driving part is used for driving the fixing discs and the multiple magnetic bars to rotate integrally. The scraping assembly is used for scraping scrap iron adsorbed on the magnetic bar; a plurality of magnetic bars in the self-cleaning rotary iron remover are arranged in a rotary grid shape, so that the magnetic bars are in full contact with materials in the rotating process and adsorb iron impurities in the materials, and the iron removal effect is further improved.

The invention relates to the technical field of purification devices, and discloses a hyperfine silicon carbide micro-powder cleaning and purifying device and a purifying method.The hyperfine silicon carbide micro-powder cleaning and purifying device comprises a separation box, an impurity removal mechanism is arranged on the separation box, and the impurity removal mechanism comprises T-shaped separation grooves formed in the inner wall of the front face and the inner wall of the back face of the separation box; t-shaped sliding blocks are slidably mounted in the two T-shaped separation grooves correspondingly, fixing blocks are slidably mounted on the two T-shaped sliding blocks correspondingly, and the ends, close to each other, of the two fixing blocks extend out of the two T-shaped sliding blocks correspondingly. Silicon carbide particles falling on the inner wall of the bottom of the impurity removal round box can be continuously turned up in the plane rotation process of the impurity removal round box, so that impurity removal holes in the bottom of the impurity removal round box are prevented from being blocked by impurities, and the silicon carbide particles can be turned up in a small range through movement of the impurity removal round box; therefore, surface damage of the silicon carbide particles caused by mechanical force generated by movement of the impurity removal round box is reduced, and the overall strength and durability of the silicon carbide particles are maintained.

Disclosed is a separator for a lithium secondary battery including a porous polyolefin substrate and showing a tan(δ) of 0.3 or less in the storage-loss modulus curve. Also disclosed is an electrochemical device including the separator. The separator shows low viscosity but high elasticity at high temperature. Therefore, the separator maintains its strength at high temperature and ensures resistance against external force in the state of high-temperature exposure, and thus can provide a lithium secondary battery with improved safety. In addition, according to an embodiment of the present disclosure, it is possible to obtain a crosslinked polyolefin separator through a simplified process, unlike the related art.

This invention relates to the field of zinc alloy surface modification technology, and particularly to a corrosion-resistant medical zinc alloy, its preparation method, and its applications. The preparation method includes the following steps: weighing raw materials according to the chemical composition of the zinc alloy; cleaning the surface of the raw materials; smelting, refining, and casting to obtain an ingot; subjecting the ingot to equal-channel angular extrusion deformation to obtain an extruded zinc alloy; performing high-energy ion implantation on the zinc alloy to obtain a nitrogen-ion-implanted zinc alloy; and preparing a coating on the surface of the nitrogen-ion-implanted zinc alloy to obtain the final product. This invention achieves a high-adhesion, dense, and uniform deposition effect on the alloy surface through the synergistic control of "equal-channel angular extrusion + high-energy nitrogen ion implantation + biomimetic coating deposition," solving the problem of severe galvanic corrosion at localized sites in existing zinc alloys under corrosive environments. Simultaneously, the dense deposition layer helps inhibit rapid dissolution of the zinc alloy surface, significantly reducing the corrosion rate of the zinc alloy in corrosive environments.

The invention discloses a curing agent, a tunnel waste slag regenerated low-permeability material based on curing of various solid wastes and a preparation method of the tunnel waste slag regenerated low-permeability material, and belongs to the technical field of comprehensive utilization of tunnel waste slag. The curing agent comprises a gelling component, an alkali-activated component, a bonding component and a reinforcing component, wherein the ratio of the gelling component to the alkali-activated component to the bonding component to the reinforcing component is (6-7): 1: (0.45-0.7): (1.6-1.7). Materials prepared from the curing agent comprise tunnel waste slag, the curing agent and water. The binding component and the multi-element solid waste synergistically improve the anti-permeability performance of the material, a three-dimensional network formed by the binding component and hydration products of the blast furnace slag and the ferronickel slag jointly act, tiny pores in the material are filled, and the porosity is reduced; and the material has higher thermal stability and gelling capacity, and is more resistant to acid and alkali environments, so that better support and stability can be provided when solid wastes are mixed.

The utility model discloses a photosensitive color-changing sun-proof aramid fiber fabric which comprises a wind-up roller, a rotating handle, a pressing block and a fabric main body, the fabric main body is sleeved outside the wind-up roller, a base layer is arranged in the middle of the interior of the fabric main body, a wear-resistant layer is arranged outside the base layer, and a corrosion-resistant layer is arranged on one side of the wear-resistant layer. The wear-resistant layer, the corrosion-resistant layer and the photosensitive layer are arranged in the aramid fabric, the overall strength of the aramid fabric can be improved through the wear-resistant layer and the corrosion-resistant layer, the use stability of the aramid fabric is guaranteed, meanwhile, the color of a photosensitive compound in the photosensitive layer can be changed in real time according to the intensity of ultraviolet rays, and the service life of the aramid fabric is prolonged. The aramid fiber has excellent heat resistance and flame retardance, so that ultraviolet rays can be effectively blocked, and the performance and the strength of the material can be kept in a high-temperature environment.

This utility model relates to the field of wind turbine technology, and the technical problem it aims to solve is the insufficient fatigue strength. To address this problem, this utility model provides a blade main beam and a wind turbine blade. The utility model includes: an upper blade main beam comprising multiple spliced ​​upper sub-beams; the upper sub-beam includes a C-shaped connecting body and two connecting lugs; the connecting lugs are formed by bending outwards from the end of the connecting body; a lower blade main beam comprising multiple spliced ​​lower sub-beams; the upper and lower blade main beams are joined vertically, and their connecting lugs are fixedly connected; a strength-equalizing connection assembly comprising a C-shaped strength-equalizing connection part and a connecting plate; the connecting plate is connected to the opening of the strength-equalizing connection part; at the splicing position, the strength-equalizing connection assembly is inserted into the interior of the connecting body, and the top wall of the strength-equalizing connection part is fixedly connected to the top wall of the connecting body. The fatigue strength of the blade of this utility model meets the requirements.

The utility model discloses a clutch pressure plate with a good heat dissipation effect, and relates to the technical field of clutch pressure plates, the clutch pressure plate comprises a pressure plate body, the center of the pressure plate body is provided with a center hole, and the pressure plate body comprises an inner plate surface and an outer plate surface; a plurality of rivet holes are formed in the edge of the top of the pressing disc in a circular array mode. A thickening sleeve is arranged on the outer disc surface; a plurality of short protruding edges are arranged on the top of the thickening sleeve in a circular array mode, a plurality of arc-shaped heat dissipation through grooves are formed in the top of the thickening sleeve and the pressure plate body in a circular array mode, and all the short protruding edges are located between every two adjacent arc-shaped heat dissipation through grooves respectively. A long rib is arranged on one side, far away from the short rib, of the arc-shaped heat dissipation through groove; the problem that the clutch pedal makes contact with the clutch plate to slip when the clutch pedal is loosened is solved, the heat dissipation effect is achieved, deformation or cracking caused by temperature changes in the using process is avoided, and the service life of the pressure plate body is prolonged.

The invention discloses cable straightening equipment for communication engineering, and particularly relates to the technical field of cable straightening, the cable straightening equipment comprises a workbench, a plurality of heating plates are used for generating heat so as to heat the surface of a cable, the temperature of the cable reaches 60-90 DEG C, a second stepping motor is used for driving a shaping roller to rotate, and the shaping roller is used for shaping the cable. The surface of a cable insulation layer is subjected to primary shaping, then the shaped cable enters the first mounting frame in the conveying process, at the moment, the smooth inner wall faces of the two shaping covers carry out secondary shaping on the surface of the cable insulation layer, and then the cable moves to the interior of the second mounting frame along with conveying. When the cable is straightened, the plurality of air outlet nozzles blow to the surface of the cable to cool the cable, and in the process, the cable material is gradually shrunk, so that the internal stress is reduced or eliminated, and the effects of straightening the cable and relatively keeping the original rigidity and strength of the cable in the straightening process are achieved.

The utility model relates to the technical field of gum, and discloses a foam tape with an anti-deformation structure, which comprises a base, the top end of the base is fixedly connected with an isolating piece, the top end of the isolating piece is fixedly connected with a breathable piece, the top end of the isolating piece is provided with a plurality of water guide grooves, the top end of the breathable piece is fixedly connected with a protective film, and the protective film is fixedly connected with the bottom of the base. A ventilation piece is arranged on the base, honeycomb holes are formed in the ventilation piece, reinforcing ribs are arranged in the base, a water guide assembly is arranged at the upper end of the base and comprises an isolation piece, a plurality of water guide grooves are formed in the top end of the isolation piece, and the base is made of polyethylene. The adhesive tape disclosed by the utility model is beneficial to keeping the surface and the interior of a packaged article dry and reducing the accumulation of moisture, so that the risks of mould and mildew are reduced, the negative effects of humidity and moisture on the adhesive property of the adhesive tape can be effectively resisted, and the adhesive force and the strength of the adhesive tape under different weather conditions are kept.

The invention relates to an electric arc furnace gunning mix which comprises the following components in parts by weight: 35-55 parts of bauxite, 15-25 parts of silicon carbide (SiC), 10-25 parts of white corundum, 3-8 parts of silicon oxide (SiO2), 2-5 parts of silicon nitride (Si3N4), 0-3 parts of zirconium diboride (ZrB2), 3-8 parts of coke powder, 0-8 parts of a sintering aid and 5-10 parts of a binding agent, and the zirconium diboride is not zero. The method has the beneficial effects that a high-temperature ceramic body containing a ZrB2-SiC multiphase material is generated at a damaged furnace lining part through added zirconium diboride and silicon carbide and coke powder in the zirconium diboride under the action of a sintering aid, and the high-temperature ceramic body has good oxidation resistance, thermal shock resistance and ablation resistance, so that the service life of the electric arc furnace lining can be greatly prolonged.

The invention discloses a water-swelling elastic plugging agent for a water-based drilling fluid and a preparation method of the water-swelling elastic plugging agent. The water-swelling elastic plugging agent comprises the following components in parts by weight: 100 parts of a polyolefin elastomer matrix material; 15 to 20 parts of a reinforced matrix material; 0.8 to 1.5 parts of a polyolefin elastomer matrix material cross-linking agent; 8 parts to 15 parts of a reinforcing agent A; 20 to 30 parts of a reinforcing agent B; 15 to 30 parts of super absorbent resin; 15 to 20 parts of a plasticizer; 0.2 to 0.8 part of an isolating agent; 0.5 to 1 part of an anti-aging agent; the plugging agent provided by the invention is simple in preparation process, not only is beneficial to industrial production, but also is convenient to prepare plugging slurry on site, can achieve a good plugging effect, and provides an effective technical means for well leakage treatment.

The utility model discloses a grease leakage prevention bearing which comprises an inner ring, an outer ring, a plurality of rolling bodies and a retainer, the rolling bodies and the retainer are arranged between the inner ring and the outer ring, the rolling bodies are installed in a plurality of bags of the retainer in a one-to-one correspondence mode, and the pitch diameter of the bags of the retainer is smaller than that of the bearing. According to the utility model, the sinkage of the retainer is adjusted by adjusting the size difference between the pitch diameter of the pocket of the retainer and the pitch diameter of the bearing, so that the rolling body is firstly contacted with the outer diameter of the retainer, the contact scraping between the inner ring of the retainer and the rolling body is avoided, and the lubricating grease scraped by the mutual operation of the retainer and the rolling body is reduced; a gap between the outer diameter of the inner ring of the bearing and the inner ring of the retainer is adjusted, so that a grease accumulation space at the gap is enlarged, and the accumulation and extrusion height of grease on a rolling body scraped by the retainer is reduced; the cross section area of the retainer is not changed, the strength and the operation stability of the retainer are maintained, and the service life of the retainer and the bearing is prolonged.

The invention belongs to the technical field of microorganisms, and particularly relates to a high-yield high-temperature-resistant pectinase strain and application thereof. The invention provides an aspergillus niger mutant strain AR-11 for producing high-yield and high-temperature-resistant alkaline pectinase, the enzyme activity level of pectinase produced by utilizing the strain for industrial fermentation can reach 8000-8200U / mL or more, the production cost is greatly reduced, and large-scale application, energy conservation and emission reduction of the alkaline pectinase are facilitated. The produced pectinase has high enzyme activity under a high temperature condition, keeps the stability of the enzyme activity in a wide pH value range, can meet the requirements of a pectinase preparation in the aspects of ramie degumming and textile refining, and can be widely applied to the ramie degumming industry.

The present invention provides a portable self-oxygen-supply long-acting fire-fighting breathing device. The breathing device includes a shell, an oxygen-producing module and a cover. The top opening of the shell is hollow inside to form a storage cavity. An exhaust hole is provided on the bottom surface of the shell. The oxygen-producing module is stuck at the opening of the shell, and the inside of the oxygen-producing module is hollow. A granular oxygen-producing agent is provided in the oxygen-producing module, and air ports are provided on the upper and lower end surfaces of the oxygen-producing module. An elastic airbag connected to the inside of the oxygen-producing module is also provided on the lower end surface of the oxygen-producing module. The cover is used to seal the opening side of the shell. A hollow connecting column for connecting a breathing hose or a mask is provided on the cover. At the same time, the shell and the cover are made of waterproof and fireproof materials. The breathing device with the above structure is very light in overall weight and easy to carry. At the same time, the granular oxygen-producing agent forms a gap space inside, and it is not easy to gelatinize. Under the condition of the same weight of oxygen-producing agent, the rescue time can be increased tenfold.

The present invention relates to the technical field of sheet cutting, and discloses a lifting and conveying device for cutting sheet materials for smart home, including a bottom support seat, the top surface of the middle part of the bottom support seat is respectively connected with a power output mechanism and a lifting and conveying mechanism, the power output mechanism is connected with the lifting and conveying mechanism, the top of the lifting and conveying mechanism is connected with a material receiving plate, the outer sides of the front and back sides of the material receiving plate are provided with a discharge support mechanism, and the inner side of the material receiving plate is provided with a clearance hole. The present invention can form a lifting and conveying device by arranging a power output mechanism, a lifting and conveying mechanism, a material receiving plate and a bottom support seat, and after being assembled together, it can be used together with a sheet cutting device, and the materials can be loaded in a centralized manner and discharged at the same level. Therefore, while ensuring that the loading operation time is not delayed, the loading operation interval time is reasonably planned, the physical strength of the staff is saved, and the high processing efficiency is maintained for a long time.

The invention discloses a single-layer effect alkali-decrement light-weight quick-drying antibacterial weft knitting fabric and a production method thereof. The single-layer effect alkali-decrement light-weight quick-drying antibacterial weft knitting fabric is formed by interweaving 40S microporous blended yarns and 50D / 36F Dupont SORONA two-component fully-drawn polyester FDY (Fully Drawn Yarn) filaments, wherein the 40S microporous blended yarns are woven with the 50D / 36F Dupont SORONA two-component fully-drawn polyester FDY filaments; the microporous blended yarn covers 50D / 36F Dupont SORONA two-component fully-drawn polyester FDY filaments and is formed by interweaving through a fine weaving process, and a plain front coil layer and a plain back coil layer are formed; the yarn weight ratio of the 40S microporous blended yarns to the 50D / 36F Dupont SORONA two-component fully drawn polyester FDY filaments is (70%-74%): (26%-30%); according to the single-layer effect alkali-decrement lightweight quick-drying antibacterial weft-knitted fabric, the processes of alkali decrement, acid pickling, antibiosis and the like are carried out in the dyeing and finishing process, so that the surface touch of the fabric is softer and more skin-friendly, a cloth cover style between two hues is formed, in addition, the single-layer effect alkali decrement lightweight quick-drying antibacterial weft-knitted fabric is endowed with the functions of light weight, quick drying, antibiosis, deodorization, moisture absorption and breathability, and the fabric is more comfortable and healthy to wear.

The utility model relates to the technical field of crystal bead rounding, in particular to a crystal bead pressing rounding device which comprises an adapter tube, a first rectangular rod is fixedly connected to one side of the outer surface of the adapter tube, a rotating shaft is fixedly connected to the end, away from the adapter tube, of the first rectangular rod, and a threaded hole is formed in the axis of the rotating shaft. Through the arrangement of the first rectangular rod, the rotating shaft, the second rectangular rod, the threaded rod, the knob and the limiting ring, during use, a worker loosens the limiting ring and rotates the knob, the knob drives the threaded rod, and the rotating threaded rod horizontally moves in the threaded hole; and then the included angle between the first rectangular rod and the second rectangular rod can be adjusted through pressing of the rotating shaft, and after adjustment is completed, a rotary knob and a limiting ring are rotated again to fix the rotating shaft, so that the effect of conveniently adjusting and fixing stress of a cylinder on crystal bead polishing is achieved, the using burden of workers is reduced, and physical strength is saved.

The invention belongs to the technical field of concrete, and discloses concrete capable of inhibiting concrete cracks, which is prepared from the following raw materials in parts by weight: 300 to 500 parts of composite cement, 1000 to 1200 parts of high-temperature-resistant aggregate, 500 to 550 parts of fine aggregate, 35 to 55 parts of anti-crack fiber, 3 to 5 parts of expanding agent, 3 to 5 parts of polymer emulsion, 100 to 150 parts of mineral powder, 5 to 7 parts of air entraining agent and 1 to 3 parts of high-efficiency water reducing agent. According to the invention, the composite cement is prepared by taking ordinary Portland cement as a base material and adding the Al2O3 cement, so that the high temperature resistance of the composite cement is enhanced; the strength and the stability of the concrete are maintained, meanwhile, the volume expansion caused by high temperature or the strength loss caused by too fast cement hydration reaction is reduced, the generation of cracks is further inhibited, and finally, the evaporation speed of water can be reduced through the use of the polymer emulsion and the air entraining agent; therefore, shrinkage cracks caused by too fast water loss are reduced, and the strength of the concrete is effectively improved.

The invention discloses a light pipe truss welding auxiliary positioning device and a using method thereof, and relates to the technical field of welding auxiliary structures, the light pipe truss welding auxiliary positioning device comprises a base unit, a vertical rod unit, a vertical rod limiting assembly arranged on a base, a vertical rod arranged on the vertical rod limiting assembly and a supporting rod limiting assembly arranged on the vertical rod; and the supporting unit comprises a supporting rod assembly arranged on the supporting rod limiting assembly, a positioning rod assembly arranged on the supporting rod assembly and a rotating reset assembly arranged on the positioning rod assembly. According to the light pipe truss welding auxiliary positioning device, the multiple sets of vertical rod units are arranged on the base, and the multiple sets of supporting units are arranged on the vertical rod units, so that a three-dimensional light pipe truss welding auxiliary structure is formed, workers are helped to position parts of pipelines or trusses to correct positions, welding is facilitated, and the welding efficiency is improved. By arranging the supporting rods and the positioning rods, it is ensured that all parts of the pipeline or the truss are accurately aligned.