35results about How to "Guaranteed physical properties" patented technology

The invention discloses a geometric multi-grid aggregation method based on array plane propulsion, and belongs to the technical field of aerodynamic numerical calculation. In order to establish an efficient and rapid geometric multi-grid aggregation method, the method comprises the following steps: establishing a fine grid control body based on a generated grid suitable for flow field numerical solution, and carrying out layered marking; selecting a seed unit to be aggregated; constructing a propulsion array plane for the obtained seed units to be aggregated by using non-aggregated peripheral adjacent units, and establishing a list of units to be aggregated; optimizing to-be-aggregated units in the to-be-aggregated unit list to obtain an optimal to-be-aggregated unit and adding the optimal to-be-aggregated unit into a coarse grid control body; calculating an aggregation rate of the coarse grid control volume, judging whether aggregation is completed according to the obtained aggregation rate of the coarse grid control volume, and if so, performing next coarse grid aggregation; if not, continuing polymerization; and detecting whether all seed units of the fine grid control body are aggregated or not, if not, continuing aggregation, and if yes, removing isolated units and ending aggregation.

The invention relates to the technical field of polyolefin master batches, in particular to a degradable polyolefin functional master batch and a preparation method thereof.The degradable polyolefin functional master batch is prepared from, by weight, 50-80 parts of polyolefin resin, 10-50 parts of modified filler, 3-5 parts of photosensitizer, 0.5-1.2 parts of dispersing agent, 0.2-2 parts of antioxidant, 1-2 parts of plasticizer and 0.2-1 part of coupling agent. The invention aims to enable the polyolefin functional master batch to have good mechanical properties, different products can be prepared, and the products prepared from the polyolefin functional master batch are degradable and can be quickly degraded in various different climatic environments, so that the pollution of plastics to the environment is reduced.

The utility model relates to an anti-cracking automobile sealing ring which comprises a sealing ring body, clamping grooves are formed in the upper side and the lower side of the sealing ring body, annular rubber strips are arranged on the two sides in the clamping grooves, first heat insulation strips are arranged on the two sides in the sealing ring body, one end of each first heat insulation strip is connected with a second heat insulation strip, and the other end of each first heat insulation strip is connected with a third heat insulation strip. An annular metal plate is arranged on one side of the second heat insulation strip and located in the sealing ring body, a metal top plate is fixedly connected to the end of the annular metal plate, and a plurality of fixing blocks are fixedly connected to the two sides of the center of the annular metal plate. The heat insulation strip I and the heat insulation strip II are arranged in the sealing ring body, so that heat transferred into the sealing ring body can be reduced, the influence of external heat on the sealing ring body is reduced, and meanwhile, the strength of the sealing ring body is increased by arranging the annular metal plate and the metal top plate; the phenomenon that the sealing ring body cracks due to vibration or external force is prevented, and the using effect of the sealing ring is kept.

The invention provides a high-temperature-resistant carbon-ceramic brake disc and a preparation method thereof, and belongs to the field of carbon-ceramic brakes. The high-temperature-resistant carbon-ceramic brake disc is prepared from the following raw materials in percentage by weight: 45-70% of modified short carbon fibers, 1-5% of boron carbide, 3-10% of an adhesive, 2-5% of boron nitride, 2-6% of carbon black, 2-6% of silicone master batches, 1-4% of graphite powder, 1-3% of ethanolamine, 1-4% of sucrose fatty acid ester, 1-5% of heavy magnesium oxide, 1-6% of nitrile rubber powder and 8-20% of an organic solvent. According to the preparation method of the high-temperature-resistant carbon-ceramic brake disc, the production process can be optimized and simplified, the production cost is reduced, meanwhile, the performance of the carbon-ceramic brake disc is further improved, the high-temperature-resistant performance and the friction performance are improved, and the effective service life is prolonged.

The invention discloses a preparation method of a high-precision ultra-wide 50 steel cold-rolled steel strip, and belongs to the technical field of ferrous metallurgy. In the production process of the steel strip, the surface quality of the pickled steel strip is improved by optimizing the pickling process; the total reduction rate of cold rolling is adjusted, the problem of steel strip rolling edge cracking is eliminated, and a product is rolled to the target thickness; a process lubricating system of the rolling mill is optimized, so that the surface quality and the plate shape quality of a product are improved; and the annealing process parameters are optimized, so that the physical properties of the product are ensured. The high-precision ultra-wide 50 steel cold-rolled steel strip is successfully developed by adopting the measures of optimizing chemical components and physical properties of a cold-rolled base material, optimizing an acid pickling process, adjusting the total reduction rate of cold rolling, optimizing a rolling mill process lubricating system and annealing process parameters and the like; the problems that in the using process of a traditional steel belt, the thickness fluctuation is large, the plate shape quality is poor, and the surface quality is poor are solved.

The invention discloses a method for removing a wax coat of bamboo wood. The method comprises the steps that fresh bamboo wood is frozen and then subjected to temperature and humidity difference treatment; heat treatment is conducted on the bamboo wood, and according to the heat treatment system, heat preservation is conducted for 2-2.5 h at the temperature of 75-85 DEG C, then the temperature is increased to 115-125 DEG C, and heat preservation is conducted for 1-1.5 h; the bamboo wood subjected to heat treatment is subjected to acid treatment in an acid solution; ultrasonic treatment is conducted on the bamboo wood subjected to acid treatment, the frequency of ultrasonic treatment is 24-60 Hz, and the time is 0.15-0.2 h; and the bamboo wood subjected to ultrasonic treatment is dried. According to the method, the wax coat on the bamboo wood is treated through multiple composite treatment means such as heat treatment, acid treatment and ultrasonic treatment, and the wax coat on the bamboo wood can be basically removed without residues while the physical characteristics of the bamboo wood can be kept.

The invention discloses a modified fiber fabric and a preparation method thereof, belongs to the technical field of cellulose, and solves the technical problem that in the prior art, sodium and potassium in a CMC-H modified fiber product remain on a water absorbing material, so that the biocompatibility of the water absorbing material is influenced. According to the modified fiber fabric and the preparation method thereof provided by the invention, the fiber fabric raw material is subjected to modification treatment to obtain carboxymethyl cellulose and ammonia ammoniation treatment in sequence on the basis of keeping the fiber shape, so as to obtain the fiber fabric of which the modifier is the ammonium carboxymethyl cellulose; the fiber fabric raw material is used for maintaining a fibrous modification treatment reaction, specifically, in the modification treatment reaction process, in fiber molecules of the fiber fabric raw material, 1, 4-glucosidic bonds in glucose molecules are connected to form cellulose chains arranged in parallel, the cellulose chains are not changed, and specific chemical groups on specific carbon positions C6, C2 and C3 on the molecular chains of fibers are subjected to a modification reaction; and the softness and physical properties of the product paper or non-woven fabric are ensured.

The invention relates to the technical field of acrylate pressure-sensitive adhesives, and discloses an irradiation cross-linked antibacterial pressure-sensitive adhesive and a preparation method and application thereof, the irradiation cross-linked antibacterial pressure-sensitive adhesive comprises the following raw material components by weight: 80-99.5% of an acrylate polymer, 0.5-20% of an antibacterial agent and 0.5-3% of a cross-linking sensitizer, monomers forming the acrylate polymer comprise a soft monomer, a functional monomer and a hard monomer, the soft monomer comprises (methyl) acrylate with an alkyl group with 2-18 carbon atoms, and the hard monomer comprises methyl (methyl) acrylate, ethyl methacrylate, isobornyl methacrylate and isobutyl methacrylate; the cross-linking sensitizer comprises a polyfunctional carbon-carbon unsaturated bond compound, and the polyfunctional carbon-carbon unsaturated bond compound comprises triallyl isocyanurate, trimethylallyl isocyanurate, triallyl cyanurate, trimethylallyl cyanurate and trimethylolpropane trimethacrylate. The cross-linking sensitizer comprises a polyfunctional carbon-carbon unsaturated bond compound, and the polyfunctional carbon-carbon unsaturated bond compound comprises triallyl isocyanurate, trimethylallyl isocyanurate, trimethylallyl cyanurate, trimethylallyl cyanurate, trimethylallyl cyanurate and trimethylolpropane trimethylacrylate.

The invention discloses a long-acting crack-resistant sidewall rubber composition for an off-the-road tire, and relates to the technical field of tires. According to the technical scheme, the rubber composition comprises the following components in parts by weight: 100 parts of a rubber component, 43-53 parts of carbon black, 5-10 parts of processing oil, 2-4 parts of tackifying resin, 1-2 parts of a rubber cracking prevention agent DH-175, 2-4 parts of an anti-reversion agent DC-273, 4-6 parts of an anti-aging agent, 1-2 parts of protective wax, 3-5 parts of zinc oxide, 1-2 parts of stearic acid, 1.3-1.8 parts of sulfur, 1.4-1.8 parts of an accelerant and 0.1-0.2 part of a scorch retarder. The invention overcomes the problem of insufficient flexural aging resistance of the existing tire sidewall rubber material, and provides the long-acting and cracking-resistant sidewall rubber composition for the off-the-road tire, which can be used for a long time in a high-heat and high-ultraviolet scene, so that the flexural aging resistance of the sidewall rubber is greatly improved.

The invention discloses a durable rubber shaft sleeve preparation method which comprises the following steps: S1, rubber improvement: when a rubber material is selected, the application scene and requirements of actual hardware need to be considered so as to determine the most suitable rubber material, and elasticity, wear resistance, chemical stability, heat resistance, high temperature resistance, oil resistance and corrosion resistance need to be considered; when the rubber material is selected, various factors need to be considered according to specific requirements, and the material suitable for the actual finished product size and application requirements is selected. The use resistance of the high-rise rubber bearing can be improved, the service life of the high-rise rubber bearing can be prolonged, meanwhile, the physical performance of a rubber material is kept, and the rubber bearing kit manufactured through the method has the following advantages that durability is high, the abrasion resistance, aging resistance and the like of the rubber material can be greatly improved through special treatment, and the service life of the high-rise rubber bearing is prolonged. The service life is longer, the performance is more stable, and the durability is improved.

The present application discloses a kind of high whiteness polyamide fibers, the whiteness value of the polyamide fiber is above 85;The polyamide fiber contains the following weight parts of additive: 1.0~5.0wt% of titanium dioxide, 0.5~10.0wt% of whitening powder, 5ppm above of silicon dioxide and / or silicon dioxide hydrate, 5ppm above of aluminum compound and / or zinc compound.The obtained polyamide fiber is good in dispersibility, high in whiteness, and expands the application of polyamide fiber in preparing clothes.

This invention relates to the field of in-situ asphalt pavement recycling technology, specifically a high-frequency vibration scraping device, including a traveling vehicle, a blade holder, and an impact blade. A support frame is located at the front of the traveling vehicle, and a rotation adjustment component is provided between the support frame and the blade holder. A depth adjustment component is mounted on the rotation adjustment component. A high-frequency hydraulic impact device is mounted on the blade holder, and the impact blade is located at the front end of the high-frequency hydraulic impact device. A limiting seat for guiding the impact blade is provided on the blade holder. This high-frequency vibration scraping device allows workers to flexibly adjust the tilt angle of the blade holder and blade during asphalt pavement removal by rotating the adjustment component. This enables the device to adapt to the scraping angle required for removing different pavements, achieving precise and highly adaptable removal operations. The depth adjustment component precisely controls the cutting depth of the blade through a screw mechanism, which facilitates the separation of the surface layer material from other layers.

The invention belongs to the technical field of silica gel preparation, and discloses high-temperature-resistant silica gel and a preparation method thereof.The high-temperature-resistant silica gel comprises matrix silica gel, filler, a cross-linking agent, a plasticizer, an antioxidant and a coloring agent, the matrix silica gel accounts for 72% of the total formula, the filler accounts for 25% of the total formula, the cross-linking agent accounts for 2% of the total formula, the plasticizer accounts for 2% of the total formula, and the antioxidant accounts for 2% of the total formula. The plasticizer accounts for 10% of the total formula. Through the selection of the plasticizer silicone oil and the precise regulation and control of the viscosity, the silica gel is endowed with good flexibility and processability, so that the silica gel can still keep good form and performance in a high-temperature environment, the degradation reaction in high-temperature and oxidation environments is effectively prevented, the service life of the material is remarkably prolonged, and meanwhile, the silica gel can be used as a high-temperature-resistant material. By adopting the non-volatile high-temperature dye, the color selection of the silica gel is enriched, the color stability under a high-temperature condition is also ensured, the color fading phenomenon is avoided, and the requirements of high-end fields on attractive appearance and performance are met.

The invention discloses an environment-friendly rubber nano composite material for tires, and relates to the technical field of rubber, the rubber nano composite material is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber components: 100.0 parts of natural rubber, 10.0-90.0 parts of carbon black, 1.0-80.0 parts of white carbon black and 1.0-20.0 parts of nanocrystalline cellulose, and a proper amount of a vulcanizing agent, an accelerant, an active agent and an anti-aging agent. Precipitated silicon dioxide, carbon black and nano microcrystalline cellulose are used as reinforcing filler, high reinforcing property is achieved, the viscous modulus is gradually reduced along with increase of the amount of carbon black replaced by nano microcrystalline cellulose due to the fact that waste paper nano microcrystalline cellulose is polar while natural rubber is non-polar, and the viscosity modulus is gradually reduced along with increase of the amount of carbon black replaced by nano microcrystalline cellulose. Due to the addition of the waste paper nano microcrystalline cellulose, the networking of the filler is reduced, so that the energy consumed by irreversible deformation is reduced, and the service life of the waste paper nano microcrystalline cellulose is further prolonged.

This invention belongs to the field of molding technology for laser imaging office equipment components, specifically a method for manufacturing a scraper. The scraper manufacturing method provided by this invention includes the following steps: S1 film molding; S2 removing the film, cleaning it to remove impurities and release agent from the film surface, obtaining a clean film; S3 preparing a coating according to the formula requirements; S4 uniformly applying the coating prepared in step S3 to the working position of the clean film obtained in step S2, obtaining a coated product; S5 drying the coated product obtained in step S4 to obtain a cured product, and cutting or slitting the cured product; S6 pasting the cut or slitting cured product from step S5 onto a metal bracket. The scraper manufacturing method provided by this invention, by coating a functional coating onto the PU film after molding, produces products with high qualification rates, strong versatility, reduced R&D costs, and increased product functionality.

The utility model discloses an asphalt blade coating device for waterproof coiled material processing, and relates to the technical field of coiled material processing. The device comprises an operation table, a first adjusting mechanism is arranged on the operation table, the first adjusting mechanism comprises a [-shaped frame fixedly connected to the top of the operation table, a [-shaped plate is slidably connected to the inner wall of the [-shaped frame, and sliding grooves are formed in the inner wall of the front side and the inner wall of the rear side of the [-shaped plate. The inner walls of the two sliding grooves are fixedly connected with first sliding rods, and the two first sliding rods are slidably connected with sliding blocks. According to the utility model, the first adjusting mechanism can adapt to the fluctuation of the thickness of the coiled material, so that the coiled material can be well attached to the surface of the coiled material no matter how the thickness of the coiled material changes, asphalt is uniformly scraped and coated on the coiled material, the overall quality of the waterproof coiled material is improved, meanwhile, the impact force can be effectively buffered in the scrape coating process, and the service life of the coiled material is prolonged. The damage to the coiled material caused by excessive pressure is avoided, and the integrity and the physical property of the coiled material are ensured.

This application discloses a servo turntable assembly for a center-driven vertical injection molding machine and the vertical injection molding machine itself, belonging to the field of intelligent manufacturing equipment. It includes a mold base, an upper mold-closing base, a lower mold-closing base, a turntable, a turntable servo assembly, a mold-closing linkage assembly, a mold-closing servo assembly, and a mold-closing fine-tuning assembly. This application has the effects of reducing injection molding machine energy consumption, reducing pollution, and improving mold-closing accuracy.

The utility model belongs to the technical field of cables, and particularly relates to a high-temperature-resistant communication cable, which comprises eight wire core conductors which are uniformly arranged, insulating layers are wrapped outside the uniformly arranged wire core conductors, an aluminum foil layer is arranged in the cable, and the aluminum foil layer not only plays a role in shielding, but also plays a role in heat insulation. The insulating wire cores are in contact with the aluminum foil layer, the aluminum foil layer is in contact with the braiding layer, the double-layer shielding effect is achieved, the signal shielding effect can be improved, the heat insulation and temperature resistance can be improved, the braided wire cores are extruded through the sheath layer to achieve the protection effect, and the cable core is prevented from being damaged by the braiding wire. The sheath layer is made of tetrafluoroethylene materials, tetrafluoroethylene further provides signal protection and high-temperature-resistant functions, meanwhile, the physical performance of the cable is guaranteed, the signal transmission performance of the cable is improved, the heat insulation and high-temperature-resistant performance of the cable is improved, and the signal transmission quality of the cable under the high-temperature condition is guaranteed.

The utility model belongs to the technical field of aerial cables, and particularly relates to a highly wear-resistant aerial cable, which comprises a conductor and an insulating layer, the insulating layer is arranged on the peripheral side of the conductor, a heat-insulating layer is arranged on the peripheral side of the insulating layer, a heat-resistant reinforcing layer is arranged on the peripheral side of the heat-insulating layer, a heat-resistant layer is arranged on the peripheral side of the heat-resistant reinforcing layer, and a flame-retardant layer is arranged on the peripheral side of the heat-resistant layer. A protective layer is arranged on the peripheral side of the flame-retardant layer, and a wear-resistant coating is arranged on the peripheral side of the protective layer. According to the utility model, the problems that when the cable is exposed in the sun for a long time, the material on the surface of the cable is possibly subjected to thermal aging and further cracks due to poor high temperature resistance of the cable are solved, and the problem that the cable is loosened or fractured due to structural damage caused by frictional wear in the long-term use process is solved.

A geometric multi-grid aggregation method based on array advancement belongs to the technical field of numerical calculation of aerodynamics. In order to establish an efficient and fast geometric multi-grid aggregation method, the present invention includes establishing a fine grid control body based on a generated grid suitable for numerical solution of flow field for hierarchical marking; selecting seed units to be aggregated; constructing an advancement array with unaggregated surrounding adjacent units for the obtained seed units to be aggregated, and establishing a list of units to be aggregated; optimizing the units to be aggregated in the list of units to be aggregated, obtaining the optimal units to be aggregated and adding them to the coarse grid control body; calculating the aggregation rate of the coarse grid control body, judging whether the aggregation is completed according to the obtained aggregation rate of the coarse grid control body, and if it is completed, performing the next coarse grid aggregation; if it is not completed, continuing the aggregation; detecting whether all seed units in the fine grid control body have completed the aggregation, judging if it is not, continuing the aggregation, judging if it is, removing the isolated units, and ending the aggregation.

The invention provides a carbon fiber tube for weaving a multi-angle unmanned aerial vehicle as well as a production line and a preparation process thereof, which are used for solving the problem that the weaving angle of carbon fibers cannot meet the application of the carbon fiber tube in the field of unmanned aerial vehicles while the production efficiency is ensured in the prior art. In order to achieve the purpose and other related purposes, the production line for weaving the carbon fiber tube for the multi-angle unmanned aerial vehicle comprises a first angle weaving unit and a second angle weaving unit, the second angle weaving unit can weave fiber yarn on the surface of a core mold at the angle of 0 degree, and the second angle weaving unit can weave the fiber yarn on the surface of the core mold at the angle of 0 degree. The first angle weaving unit can weave fiber yarns to the surface of the core mold, so that the production line can use a pultrusion process to ensure the production efficiency and ensure that the physical properties of a fiber yarn layer can meet the product requirements; therefore, the problem that the weaving angle of the carbon fiber cannot meet the application of the carbon fiber tube in the field of unmanned aerial vehicles while the production efficiency is guaranteed is solved.

The invention relates to the technical field of corrugated board production, and particularly discloses a high-wear-resistance and high-strength flexible laminating device which comprises a supporting seat, the two lifting driving mechanisms are oppositely arranged above the two sides of the supporting base in the length direction, and the multiple arc-shaped scale type pressing pieces are arranged at the bottom of the arc-shaped base in a linear mode; the multiple elastic connecting mechanisms are arranged between the arc-shaped base and the supporting base in a linear mode and connected with the multiple arc-shaped scale type pressing pieces correspondingly. According to the high-abrasion-resistance high-strength flexible attaching device, an upper pressure roller of a traditional corrugated board production pressing machine is replaced with the high-abrasion-resistance high-strength flexible attaching device; the corrugated paper and the bottom paper which are pasted can be flexibly pressed in cooperation with low-temperature and low-pressure steam, the situation that the corrugated paper and the bottom paper are crushed due to single-point-line hard pressing fit under high-temperature and high-pressure steam is avoided, the physical performance of raw paper is kept, and the quality of corrugated boards is improved.

The invention provides a high-temperature-resistant low-pressure-change shock-absorbing material and a manufacturing process of the high-temperature-resistant low-pressure-change shock-absorbing material. The rubber composition comprises the following components in parts by mass: 190 parts of oil-extended EPDM (100 parts of oil / 100 parts of rubber), 5 parts of natural rubber, 30-80 parts of carbon black, 30-100 parts of an inorganic reinforcing agent, 5-20 parts of white carbon black, 70-100 parts of high-flash-point paraffin oil, 5 parts of zinc oxide, 3-10 parts of magnesium oxide, 1 part of stearic acid, 1-2 parts of polyethylene glycol, 1-4 parts of a heat-resistant anti-aging agent, 0.2-0.8 part of sulfur and 4-7 parts of an accelerant. The anti-aging agent and the high-flash-point paraffin oil are added into the shock-absorbing material, so that the consumption of sulfur is reduced on the premise that the original physical properties and low pressure change performance of the shock-absorbing material are kept, the heat-resistant temperature of the shock-absorbing material is further increased to 145 DEG C, and the hardness change does not exceed + 8A under the thermal oxidation condition of 145 DEG C.

The present application relates to the technical field of waste plastic regeneration processing, and particularly relates to an ABS plastic particle intelligent grading production line and a production method thereof. The production line comprises a vibrating screen structure, a multi-layer screening structure, a feeding structure, a blockage prevention structure and an auxiliary cleaning structure. The multi-layer screening structure comprises longitudinally stacked screen frames. The blockage prevention structure comprises a rotatable central blockage cleaning rod arranged in the screen frame. The system realizes intelligent linkage and speed self-adjustment through feeding, screening, blockage cleaning and discharging, ensures the continuity and stability of production, perfectly matches the continuous feeding rhythm of downstream equipment such as an extruder and a granulator, significantly improves the operation rate of the whole regeneration production line, meets the intelligent demand of the ABS waste plastic regeneration production line, and the output can be directly and seamlessly connected to subsequent plasticizing and molding equipment, so that the intelligentization of ABS waste plastic from crushing, cleaning to high-quality regeneration processing is realized.

The invention provides a novel monofilament high-gauge mattress material and a preparation method thereof, and belongs to the technical field of textile, high-quality composite fiber is selected as a core material, a middle spacer layer is composed of thousands of superfine and super-tough fiber filaments, the toughness is good, the supporting force is high, and the problem that in the production process of existing high-gauge fabric, the high-gauge mattress material is not prone to deformation is solved. Only the middle separation wire is simply inserted into the upper surface and the lower surface, and nodules are not fixed and are easy to slide. The product disclosed by the invention can show extraordinary rebound resilience when being pressed, has excellent air permeability, is completely non-toxic and harmless, does not release formaldehyde, does not contain heavy metals, does not release any other harmful substances, and realizes perfect fusion of safety and environmental protection.

The invention provides textile moisture absorption equipment, and relates to the technical field of moisture absorption equipment, the textile moisture absorption equipment comprises an air suction device and a moisture absorption device, the air suction device is fixedly connected with the moisture absorption device through a pipeline; wherein the moisture absorption device comprises a moisture absorption box body, a condensation mechanism and a water collection mechanism, an air inlet is formed in the top end of the moisture absorption box body, the end, away from the air suction device, of the pipeline is connected with the air inlet, and the condensation mechanism is arranged at the end, close to the pipeline, of the moisture absorption box body; the water collecting mechanism is arranged at the end, away from the pipeline, of the moisture absorption box body, and the liquid outlet end of the condensation mechanism is connected with the water collecting mechanism; according to the moisture absorption equipment for the textiles, by continuously reducing the humidity of the storage space, the fiber strength of the textiles is effectively prevented from being reduced, the problems of fiber deformation, adhesion or musty odor and the like caused by too high humidity are reduced, the service life of the textiles is prolonged, and the original quality and value of the textiles are kept.

The application discloses a kind of water conservancy construction geotechnical sampling device and method, it is related to soil detection sampling technical field, including base, lifting mechanism, sampling execution mechanism;Sampling execution mechanism includes sampling column, drive assembly and inlay strip, sampling jaw;Drive assembly is used to drive sampling jaw swing;Inlay strip can be moved to outside relative to sampling jaw, to extrude soil at the edge of sampling jaw to outside displacement.The application in the process of jaw convergence, adjacent permanent magnet on inlay strip attract each other, drive inlay strip to move to outside.This action will be extruded soil at the edge of jaw to outside shear, displacement, so that disturbed soil is located at the outside of sampling jaw.Finally, the sample left in the inside of sampling jaw is substantially not subjected to lateral extrusion force, so as to maintain the original density, porosity and permeability of soil, ensure the reliability of detection data, reduce edge soil extrusion, maintain the physical properties of sample as is.

The invention discloses a space-time high-precision structure-preserving numerical algorithm, and belongs to the technical field of algorithms, the algorithm is based on a Lagrange multiplier method, and an original equation or equation set and related physical properties are combined to establish a whole problem by introducing a proper number of Lagrange multipliers; the whole problem is converted into a nonlinear equality constraint optimization problem with partial differential equation or equation set constraint in combination with an optimization thought; performing high-precision numerical discretization on the time direction and the space direction of the nonlinear equality constraint optimization problem; and an appropriate optimization method is selected to solve an optimization problem under a discrete condition, so that numerical calculation of the whole algorithm can be realized. The algorithm provided by the invention is constructed from a new angle of optimization, and based on the characteristic that the original physical properties are naturally ensured by a higher-dimensional system, the degree of freedom in the construction of the structure-preserving numerical algorithm is larger, and the algorithm has good algorithm stability in solution of related problems and numerical simulation, and is suitable for long-time numerical calculation.

The utility model discloses a reinforcing steel bar cutting machine capable of rapidly switching cutting angles, and belongs to the technical field of construction engineering machinery and equipment. The device comprises a base, a fixing clamp, a fixing rod, a fastening bolt, a cutting machine fixing plate, a power rod, a vibration block, a saw blade push rod and a saw blade. Through the design of the fixing clamp and the fixing rod, rapid adjustment of the cutting angle of the cutting machine is achieved, a user can adjust the angle only by unscrewing the fastening bolt and then tighten the fastening bolt for fixation after adjustment, operation is easy and convenient, angle adjusting time is shortened by about 50%, and working efficiency is improved by about 25%; a straight saw is adopted to replace a circular saw, the cutting precision is improved by about 20%, the error is reduced to be within 1 mm, cutting heat accumulation and vibration are reduced, the service life of equipment is prolonged by about 20%, and the maintenance cost is reduced by about 30%. According to the device, the cutting precision, the operation convenience and the equipment stability are remarkably improved, and an efficient and reliable reinforcing steel bar cutting solution is provided for building construction.

The invention relates to the technical field of foaming materials, in particular to a polypropylene foaming material and a preparation method thereof. The polypropylene foaming material comprises the following components in parts by weight: 88-96.5 parts of polypropylene resin, 0.5-2 parts of a sensitizing agent, 2-5 parts of a nucleating agent and 1-5 parts of other auxiliary agents. The preparation method of the polypropylene foaming material comprises the following steps: S101, uniformly mixing polypropylene resin, a sensitizing agent, a nucleating agent and a compound additive according to a ratio to obtain a mixed material; s103, feeding the mixed material into an extruder, and carrying out extrusion granulation; s105, carrying out irradiation crosslinking on the extrudate obtained in the step S103; and S107, performing blow molding, extruding and foaming to obtain the polypropylene foaming material. The polypropylene foaming material is high in foaming ratio.