81results about How to "Regular shape" patented technology

The utility model relates to the technical field of steel wire automatic forming machines, in particular to a full-automatic steel wire wavy line forming machine which comprises an installation frame, a line pressing assembly is arranged at the bottom of the installation frame, and an extension module is arranged on the side face of the installation frame. The full-process automatic production of the wavy line formed by the steel wire can be completely realized, each part of the machine is simple and practical, the machine has the characteristics of low cost and high efficiency, the labor cost is saved, the risk of industrial injury is avoided, the machine is an advanced specialized machine, the driving motor is used as a power source, and the production cost is reduced. The driving motor drives the first gear and the second gear to rotate through the transmission structure, then conveying of the steel wire and forming of the wavy line are achieved, and the straightness of the steel wire in the conveying process and the regular shape of the formed wavy line are guaranteed through arrangement of the first straightener and the second straightener.

The utility model relates to the technical field of pull ring production, in particular to ultrathin pull ring continuous production equipment with a tension control function. The equipment is mainly composed of a rack, a discharging winding roller, an adjusting roller, a horizontal roller, an upper stamping die, a lower stamping die, a tension adjusting block, a motor and the like, raw materials are placed on the discharging winding roller, the adjusting roller and the horizontal roller guide the materials to be conveyed, the upper stamping die and the lower stamping die are responsible for pull ring stamping forming, and the tension adjusting block regulates and controls the tension of the materials. The motor drives the waste roller and provides power for the conveying belt through belt transmission, and a spring and a sliding block in the tension adjusting block are matched with the tension adjusting switch to achieve accurate tension adjustment. The tension control device has the beneficial effects that the product quality can be stabilized, the defects of the pull ring caused by the tension problem are reduced through accurate tension control, the product percent of pass is improved, and meanwhile, the continuous production process of equipment is matched with an efficient waste treatment and finished product collection mode, so that the production efficiency is greatly improved, the production cost is reduced, and the market competitiveness of enterprises is enhanced.

A method for preparing spherical aluminum hydroxide micropowder includes the following steps: A sodium aluminate solution A is prepared by mixing aluminum hydroxide and sodium hydroxide; after heating, a self-made polyvinylpyrrolidone-g-polysiloxane additive is added, and the mixture is continuously heated and stirred to form solution B; sodium bicarbonate is then added and the reaction is continued with stirring; after the reaction is complete, the mixture is filtered while hot to obtain the filtrate, which is solution C; solution C is heated under stirring conditions, and after the reaction is complete, the temperature is lowered at a certain rate to obtain a mixed product; the mixed product is filtered, washed, and dried to obtain spherical aluminum hydroxide. The spherical aluminum hydroxide prepared by this method has a regular morphology and concentrated particle size distribution, with a D50 of approximately 7-10 micrometers. Compared with irregularly shaped aluminum hydroxide of the same particle size, it has better filling performance, effectively improving the problems of poor dispersibility and high viscosity caused by high filling of aluminum hydroxide in polymer materials, and improving the subsequent processing performance of the material.

The utility model provides a segmented cutting forming tool of tricholoma matsutake. The segmented cutting forming tool of tricholoma matsutake includes: the workbench that sets up the inclined groove, the fixed plate is fixedly installed in the inclined groove, the cutting frame is hinged on the fixed plate, and the bottom rotation of cutting frame is installed with the winding shaft, the protective cover is fixedly installed on the cutting frame and is connected with the winding shaft rotation, the torsional spring is fixedly installed in the protective cover and is connected with the winding shaft, the cutting line one end is coiled on the winding shaft, the movable plate is slidably installed on the cutting frame, and the movable plate is fixedly connected with the other end of cutting line. The segmented cutting forming tool of tricholoma matsutake has the advantages that the efficiency of segmented cutting of tricholoma matsutake can be improved, and the production needs are met.

The application discloses a die-casting device for window sliding wheel machining, which comprises an operating machine table arranged on the ground, a die-casting base fixedly arranged at the middle of the bottom of the inner cavity of the operating machine table, and a limiting guide rod fixedly arranged at the top of each corner of the die-casting base, and belongs to the technical field of die-casting. The die-casting device for window sliding wheel machining is characterized in that the upper die, the hydraulic rod, the lower die mechanism and the electric telescopic rod are matched to realize efficient and stable die-casting. During die-casting, the structures are cooperatively driven to automatically circulate and flow the cooling liquid, the cooling and shaping are rapidly completed, the processing efficiency is effectively improved, the circulating cooling liquid can drive the inside of the lower die mechanism to generate high-frequency oscillation, the internal bubble defects of the casting are eliminated, the product structural strength and surface quality are improved, meanwhile, the cooling liquid is uniformly disturbed in the die to improve the heat exchange efficiency, the temperature of the cavity is rapidly and evenly balanced, the deformation and cracking of the casting are prevented, the forming precision and product qualification rate are ensured, and the overall structure is simple, stable and reliable in operation.

This invention relates to the field of cable aluminum foil coil processing technology, and particularly to an integrated equipment and method for forming and coating cable aluminum foil coils based on a conical mold. The equipment includes a transport frame and coating wheels. A mold range adjustment mechanism is provided on the outer side of the transport frame, and a position adjustment mechanism is provided on the outer side of the conical mold range adjustment mechanism. The conical mold range adjustment mechanism includes a rotating column, a stabilizing plate fixedly connected to the top of the rotating column, and a conical mold piece on the top of the stabilizing plate. A fixing rod is fixedly connected inside the rotating column, and a movable tube is fixedly connected to the outer side of the fixing rod. In this invention, by adjusting the speed of a primary motor to change the range between the conical mold pieces, and in conjunction with the synergistic effect of the position adjustment mechanism, precise adjustment of the mold range and position can be quickly completed without the need for separate forming and coating processes, reducing equipment space requirements and process connection time.

This utility model belongs to the field of photovoltaic technology and discloses a positioning fixture for cutting silicon rod edge pieces. The positioning fixture for cutting silicon rod edge pieces includes a base, a first positioning component, and a second positioning component. The first positioning component is used to position the silicon rod edge piece when cutting the sharp corner of the end of the edge piece. It includes a first positioning post and a first clamping member, which are adjacent to each other on the base along a first horizontal direction. The side of the first positioning post is configured to abut against the side plane of the silicon rod edge piece, and the first clamping member is configured to clamp the arc surface of the silicon rod edge piece. The second positioning component is used to position the silicon rod edge piece when cutting the side arc block. It is set on the base and can simultaneously limit the silicon rod edge piece in the first and second horizontal directions, with the second horizontal direction perpendicular to the first horizontal direction. This utility model can position the silicon rod edge piece, ensuring the cutting accuracy of the silicon rod edge piece.

The invention relates to the technical field of granulators, in particular to a traditional Chinese medicinal material processing and granulating device which comprises a base, a grinding knife and a pressing blade which are rotationally arranged on the base, and a driving part which is arranged in the base, is connected with the grinding knife and the pressing blade and is used for driving the grinding knife and the pressing blade to rotate relatively. According to the device, materials are cut off through the arc-shaped scraper, so that particles are regular in shape; the movable pipe extends the extrusion path, particles are more compact and firmer, the granulation quality and uniformity are integrally improved, meanwhile, the position of the movable pipe can be adjusted, the length of the extrusion path of materials is changed, various production requirements are met, meanwhile, the arc-shaped scraper is attached to the surface of the movable pipe, it is ensured that the materials can be effectively cut off in different working states, and the production efficiency is improved. And internal and external co-extrusion is realized, so that the granulation effect is further optimized, and the production efficiency and the product quality are improved.

The utility model discloses a miniaturized double-frequency wide-beam terminal antenna, which relates to the technical field of mobile terminal antennas and comprises an antenna cap, an antenna housing, a radiator assembly, a feed network module, a radio frequency connector and an antenna base, and the radiator assembly, the feed network module and the radio frequency connector are sequentially distributed inside the antenna housing from top to bottom. According to the miniaturized double-frequency wide-beam terminal antenna, the radiation copper strip is arranged in a gradually-changed spiral form, and when the radiation copper strip is at the same rising angle, the spiral arm with the top open circuit structure has a wider beam width than the spiral arm with the short circuit structure, so that low-elevation electromagnetic signal radiation and reception of the satellite antenna are facilitated; the radiation copper strip is provided with four feeding points, each feeding point is connected with two oscillator arms with different lengths, the circular polarization characteristic and the double-frequency radiation characteristic of the antenna are guaranteed, the two oscillator arms with the same feeding guarantee different rising angles and widths, the isolation degree of double-frequency radiation is improved, the shape of a directional diagram is more regular, and higher radiation gain is achieved.

The invention discloses a superfine medium-entropy nanoparticle catalyst for electrochemical oxidation of ethylene glycol and other micromolecules as well as a preparation method and application of the superfine medium-entropy nanoparticle catalyst. The catalyst comprises a superfine medium-entropy nano-particle metal material and a conductive substrate material, the superfine medium-entropy nano-particle metal material comprises copper metal and at least two precious metals, and the catalyst has outstanding catalytic ability. The preparation method of the catalyst is simple and convenient, and only the superfine medium-entropy nanoparticle metal material needs to be synthesized through a solvothermal method and is loaded on the conductive substrate material; the temperature of the whole synthesis process is lower than 200 DEG C, so that the problems of high cost, high energy consumption, poor stability, large potential safety hazard and the like in the traditional synthesis method are solved. The superfine medium-entropy nanoparticle catalyst prepared by the invention shows excellent performance in oxidation of micromolecules such as electro-catalysis ethylene glycol and the like. By taking ethylene glycol electrooxidation as an example, the Pb-CuPtPd MEANs-C can efficiently and stably convert ethylene glycol into glycollic acid, the mass activity of the Pb-CuPtPd MEANs-C under 0.9 V vs.RHE reaches up to 14 A mg <-1 > PtPd, and the Faraday efficiency (FEGA) of glycollic acid production is 82.3%.

This invention relates to the field of meat cutting technology and discloses a meat cutting device for food production, comprising: a rotating cutting blade in the shape of a grid cylinder with a cutting edge on the outer ring side; a base that partially surrounds the lower side and a horizontal side of the cutting blade; an arc-shaped surface located inside the base and corresponding to the cutting blade, with the distance between the lower end of the arc-shaped surface and the cutting blade gradually decreasing upwards; the meat to be cut enters through the gap between the lower end of the arc-shaped surface and the cutting blade, moves around the outside of the cutting blade, and gradually enters the inner side of the cutting blade grid to be cut into meat pieces; a pressing component located above the cutting blade, pressing down on the grid corresponding to the cutting blade, causing the meat pieces within the grid to pass through the cutting blade and fall; this invention utilizes the rotation of the cutting blade to bring the meat to be cut into the gap between its outer side and the arc-shaped surface, the arc-shaped surface causing the meat to gradually enter the inner side of the grid to be cut into meat pieces, and the pressing component to separate the meat pieces from the cutting blade, achieving one-time cutting into pieces, with the characteristics of no obvious impact and a stable cutting output process.

The present application relates to the technical field of construction machinery structure welding, and especially to an intelligent welding device for a lower frame of an excavator, comprising a base, a fixing seat arranged on the outer wall of the base, a rotary table sleeved on the outside of the fixing seat, an X support placed on the outside of the rotary table, and a continuous welding device arranged between the rotary table and the X support. The present application uses a rotating roller to real-time clamp and limit two cover plates, which can effectively prevent the cover plate angular deformation caused by the cooling and shrinkage of the weld, and can save the symmetrical welding, segmented skip welding and other processes, reduce the post-welding slag cleaning, polishing and other finishing workloads, compress the processing time, improve the welding forming quality and production efficiency, and meanwhile, with the help of the self-adaptive adjustment of the deflection assembly, the welding head can be accurately deflected along the inclined plane, the X support complex inclined plane continuous welding can be adapted, the angular deviation and welding blind area can be avoided, the weld penetration uniformity and the regular appearance can be ensured, and the welding precision and continuity can be further improved, and the overall welding quality can be stabilized.

The invention relates to the technical field of aerogel microsphere preparation, in particular to a method for preparing composite nanocellulose aerogel microspheres based on electrostatic field auxiliary regulation and control. Comprising the following steps: forming uniform liquid drops from a silane modified nano cellulose suspension through an electrostatic spraying device provided with an annular electrode group and a real-time monitoring feedback system; the liquid drops are induced by an electrostatic field in a pre-cooling area to be initially set and then subjected to liquid nitrogen cryogenic treatment, gradient freeze drying is conducted, and aerogel microspheres are obtained; and finally, carrying out surface modification on the aerogel microspheres, and loading nano microspheres under the assistance of an alternating electric field to obtain the composite nano cellulose aerogel microspheres. Through the synergistic effect of the multi-stage electric field, accurate regulation and control on the whole process of microsphere forming, internal structure construction and functional compounding are realized, so that the composite nanocellulose aerogel microspheres with narrow particle size distribution, uniform size and adjustable functions are prepared, and the composite nanocellulose aerogel microspheres have wide application prospects in the fields of adsorption, catalysis, biological medicine and the like.

The application provides a lithium-rich manganese-based material and a preparation method and application thereof. The chemical general formula of the lithium-rich manganese-based material is Li 1.2+x (Mn a Co b Ni c ) 0.8‑x O2, wherein, -0.2

The utility model relates to the technical field of particulate matter detection, in particular to a particulate matter filtering material performance testing device which comprises a first round pipe and a second round pipe, a connecting cylinder is fixedly connected to one side of the first round pipe, a wind speed measuring probe is fixedly connected to the surface of the first round pipe, a filtering structure is arranged in the first round pipe, and a wind speed measuring probe is fixedly connected to the surface of the second round pipe. A wind pressure measuring probe is fixedly connected to the surface of the second round pipe, a fan is arranged on one side of the interior of the second round pipe, and a fixing structure is arranged on the other side of the interior of the second round pipe. The wind speed measuring probe, the filtering structure, the wind pressure measuring probe, the fan and the fixing structure are arranged and integrated in one set of device, the matching error caused by independently adjusting various parameters is solved, the operation difficulty is greatly reduced, the size of the device is effectively controlled, and the filtering structure and the fixing structure are arranged, so that the device is convenient to use. The service life of the filter screen is prolonged, and the to-be-tested material is more convenient to clamp.

The utility model relates to a kind of sample preparation mould for liquid crystal encapsulation frame glue hardness test, belong to liquid crystal encapsulation frame glue testing technical field, sample preparation mould includes sample preparation layer, release layer and pressure cover layer, the sample preparation layer is structured as plate structure, and the center is provided with through-hole;Release layer is set to two pieces, respectively laid in the upper and lower two sides of the sample preparation layer;Pressure cover layer, set to two pieces, respectively laid in the other side of the release layer.The sample preparation mould for liquid crystal encapsulation frame glue hardness test provided by the utility model uses common material in each combination layer, and the manufacturing cost is low, and the mould can be repeatedly used;Through the sample preparation mould, the thickness of frame glue coating can be made consistent, shape is neat, UV curing effect is good, and easy to release.

The invention belongs to the technical field of fine chemical engineering, and particularly relates to a process for preparing nano calcium carbonate by a wet method. A process for preparing nano calcium carbonate by a wet method comprises the following steps: polymerizing N-isopropylacrylamide and vinyl imidazole to generate a copolymer, then adding the copolymer into a calcium hydroxide suspension to form a crystal nucleus, dispersing the crystal nucleus, introducing carbon dioxide gas to carry out carbonization reaction, introducing nitrogen after the reaction is completed, and carrying out vacuum drying to obtain the nano calcium carbonate. Recovering the copolymer to be neutral and desorbing from the crystal surface; and finally, carrying out centrifugal separation, collecting a solid product, and carrying out vacuum drying to obtain the nano calcium carbonate. The nano calcium carbonate prepared by the process is uniform in particle size and good in dispersity. No toxic or harmful auxiliary agent needs to be introduced in the nano calcium carbonate production process, and the production purity is high.

The utility model discloses a cable foamed filling strip, including the conductor by trapezoidal annealing copper monofilament stranding, its outside is covered with coaxial inner semiconductive layer, insulating layer, outer semiconductive layer, buffer tape layer, copper band shielding layer, inner sheath, double -deck reverse steel tape armoring and high -resistance no -halogen outer sheath, the fan -shaped ceramicizable polyolefin foamed filling strip of built -in steel wire rope is arranged between the adjacent conductive wire core, the cable has low thermal resistance, low loss characteristic under normal temperature, the foamed strip ceramicization is rapid when the fire, makes integral thermal resistance instantaneous rise >=5 times, and the cooperation double -deck reverse steel tape armoring realizes hundred meters vertical difference self -supporting, the distributed optical fiber is inlayed in buffer tape layer, can real -time monitoring conductor temperature. The utility model discloses compact structure, energy -conserving and environment -friendly, fire -resistant, high mechanical strength, is applicable to high -rise building, tunnel and high difference power supply and distribution system.

The invention discloses a preparation method of a rare earth doped silicate-based ceramic luminescent material, and belongs to the technical field of luminescent materials. The preparation method comprises the following steps: weighing raw materials according to the stoichiometric ratio of Ba0. 975Si2O5: 0.01 Eu < 2 + >, 0.015 Pr < 3 + >, mixing and grinding to obtain mixed powder; adding sodium chloride and potassium chloride into the mixed powder, grinding, then calcining under protective gas, and finally washing, separating and drying to obtain the rare earth doped silicate-based ceramic luminescent material. According to the preparation method of the rare earth doped silicate-based ceramic luminescent material, the calcination temperature and time can be reduced, and the energy consumption and time cost required by production can be reduced. In addition, the preparation process is simple, and the prepared material is high in crystallinity and regular in morphology and has excellent optical storage performance.

The utility model provides a drying device for drying sludge by using waste oil, which relates to the technical field of sludge treatment devices and comprises a wet sludge conveyor inserted into a frying and drying tank, a molding plate is welded at a discharge port of the wet sludge conveyor, a round hole is formed in the surface of the molding plate and communicated with a connecting pipe, and the diameter of the connecting pipe is the same as that of the round hole. The end, deviating from the molding plate, of the connecting pipe is connected with a feeding port of a drying screw conveyor, and the drying screw conveyor penetrates out of a discharging port of the frying and drying tank and is arranged above the dry sludge bin; the technical problems that in the prior art, the drying period is long, cooperative treatment with waste oil is not achieved, and resources are wasted are solved, and the technical effects that energy consumption is reduced, drying time is shortened, sludge and waste oil are synchronously treated, and resources are cooperatively utilized are achieved.

This invention relates to the field of freeze-drying technology, specifically to an intelligent vacuum freeze dryer and its usage method. The dryer includes a main unit and a pre-freezing vacuum chamber within it, a shelf placed inside the pre-freezing vacuum chamber, the shelf having an internal cavity and a main gas inlet at its bottom for gas to enter the internal cavity; a carrying tray with multiple evenly arranged internal components for storing materials, the tray having multiple planar grids and heating elements for releasing heat, multiple push rods for moving materials within the planar grids, and an adjustment component for adjusting the position of the push rods according to different usage environments; and side rotating columns with multiple evenly rotatable components connected to the sidewalls of the carrying tray, each side rotating column having multiple exhaust ports, and the carrying tray having an efficiency-enhancing component for driving the side rotating columns.

This invention discloses a method for detecting paper tube fireworks, including shaping the paper tube fireworks, first photographic detection, and deformation of the outer perimeter. The deformation component squeezes or stretches the outer perimeter, causing the fuses inside the fireworks tube to move. A second photographic detection is then performed, followed by comprehensive data analysis. First, the paper tube fireworks, just assembled mechanically, are shaped to ensure a regular shape and accurate arrangement of all paper tubes during photographing. This allows for accurate capture of the fuses inside each individual tube, avoiding interference between tubes and significantly reducing the amount of data processing required. Second, after the first photograph, the outer perimeter is deformed, and a second photograph is taken. This deformation causes a slight shift in the two fuses inside each tube, and a second photograph is taken, causing misalignment of overlapping fuses and reducing the false positive rate.

The invention discloses a visual guidance self-adaption splitting machine in intelligent central kitchen complete equipment, and relates to the technical field of central kitchen splitting, the visual guidance self-adaption splitting machine comprises an upper frame and a cutting table I. A driving assembly used for assisting splitting is arranged in the upper frame, and the driving assembly comprises a first hydraulic rod, a second hydraulic rod, a bottom plate and a connecting plate; a connecting plate is mounted at the output end of the second hydraulic rod. According to the visual guidance self-adaptive splitting machine in the intelligent central kitchen complete equipment, accurate visual detection of materials is achieved through cooperation of the CCD camera and the light supplementing lamp, the size, the shape and the placing position of frozen meat products can be automatically recognized, positioning can be completed without manual intervention, the driving assembly drives the splitting structure to conduct self-adaptive adjustment, and the working efficiency is improved. The slitting knife is in sliding fit with the built-in groove, two slitting modes of slicing and small slicing can be flexibly switched, the slitting distance and size can be adjusted, the slitting requirements of materials of different specifications can be met, and the problems that traditional equipment is poor in adaptability and needs frequent manual adjustment are solved.

The application discloses a zinc oxide / molybdenum disulfide nanocomposite and a preparation method and application thereof. The zinc oxide / molybdenum disulfide nanocomposite is prepared by taking bulk molybdenum disulfide and zinc acetate as raw materials, peeling off few-layer molybdenum disulfide nanosheets from the bulk molybdenum disulfide by using an ultrasonic cell pulverizer, and depositing ZnO nanoparticles on the molybdenum disulfide nanosheets in situ by using a coprecipitation method. The composite material has regular morphology, and the sizes of the two base materials are matched. The specific steps of the preparation method include that the method has low cost, simple equipment and low operation difficulty, and can be used for industrial large-scale production. The obtained zinc oxide / molybdenum disulfide nanocomposite has excellent abilities in antibiosis, biofilm removal, anti-inflammation and blood vessel formation, and can be applied to the fields of biomedical materials and the like.

A method for preparing a hydrodemetallization catalyst, belonging to the field of catalyst preparation technology, includes the following steps: impregnating spherical carbon particles with an iron-containing solution and drying them; mixing the dried carbon particles uniformly with alumina sol and forming droplets; drying and calcining the formed products to obtain an iron-modified alumina support; immersing the iron-modified alumina support in an organic ammonium solution for a first and second hydrothermal treatment; drying and calcining the treated products to obtain a treated alumina support; impregnating the treated alumina support with an active component impregnation solution; drying and calcining the impregnated support to obtain the hydrodemetallization catalyst. The catalyst prepared by this method exhibits high dehydrogenation, Ni removal, and V removal activity, while also possessing high tolerance for metal impurities. This catalyst is particularly suitable for the hydrotreating of heavy oil with high Ni impurity content.

The invention provides a polymer microsphere as well as a preparation method and application thereof. The polymer microspheres contain a first polyester material and a second polyester material, the first polyester material is polyester modified by a hydrophilic substance, and the second polyester material is polyester not modified by the hydrophilic substance; the polymer microsphere has a through pore channel structure, the through pore channel structure forms pores in the surface of the polymer microsphere, and the interior of the polymer microsphere is of a porous honeycomb structure. When the polymer microsphere provided by the invention is used as an organism filling agent, the polymer microsphere has a good adhesion effect on cells, better cell adhesion can be realized, and collagen secretion is improved; meanwhile, the through pore channel structure enables body tissues to grow more uniformly in the microspheres and strengthens the combination of the tissues and the polymer microspheres, so that the polymer microspheres are not easy to displace after being injected and in the later degradation process, and the safety is improved.

The application discloses a preparation method of amino-modified magnetic microspheres, which comprises the following steps: modifying the surface of magnetic nanoparticles to obtain magnetic microspheres with double bonds on the surface; performing a polymerization reaction on the surface of the magnetic microspheres to form core-shell magnetic beads with a surface polymer; and performing an amino-modification treatment on the core-shell magnetic beads to form amino-modified magnetic microspheres. The magnetic microspheres have strong magnetism, uniform particle size distribution, regular morphology, and small batch difference, and the sensitivity of magnetic bead extraction is greatly improved.

The present application relates to a kind of multi-channel acoustic black hole sound absorption structure and silencer, belong to noise control technical field, the defects of current acoustic black hole sound absorption structure are solved, including shell, the side of shell is open, the open side of shell is used to receive incident sound wave, partition is equipped in shell to separate the space in shell into multiple sound absorption channels, multiple rib plates are equipped in each sound absorption channel, the outer end of rib plate is fixed with the inner side of shell, rib plate is perpendicular to the incident direction of sound wave, multiple rib plates are spaced along the incident direction of sound wave, and along the incident direction of sound wave, the width of multiple rib plates gradually increases, the inner end of multiple rib plates is set power law function distribution, the inner end of multiple rib plates is bonded with the outer side of porous plate and is fixedly connected with porous plate, the sound absorption structure of the present application can better realize ultra-wideband sound absorption.

This invention discloses a three-stage displacement-related friction energy dissipation device and method, comprising a nested layer consisting of an integrally formed U-shaped outer layer and an I-shaped inner layer, with long friction blocks and U-shaped concave surfaces respectively on the U-shaped outer layer and the I-shaped inner layer; it also includes an intercalation layer with short friction blocks and arc-shaped protrusions corresponding to the long friction blocks and U-shaped concave surfaces. The two arms of the intercalation layer are inserted into the gap between the long friction blocks and U-shaped concave surfaces of the U-shaped outer layer and the I-shaped inner layer of the nested layer, and slide relative to the nested layer to achieve the first level of limiting; a second level of limiting is achieved by a screw sequentially penetrating the nested U-shaped outer layer, the intercalation layer, and the I-shaped inner layer. This invention achieves three-stage variable stiffness friction adaptive energy dissipation by providing constant friction force during the small displacement stage, exponentially increasing friction force during the medium displacement stage, and mechanically limiting and locking during the large displacement stage, which can better adapt to the differentiated requirements of structures for damping force and stiffness under earthquakes of different intensities.

A mold, fixture, and forming and testing method for uniaxial tensile testing of concrete are disclosed. The mold includes a base plate, side plates, and a non-standard assembly block formed by bolting a flat plate and a transition block with an arc. After assembly, the whole block has a gradually changing cross-sectional shape adapted to a dog-bone rod-shaped specimen, which can ensure that the transition section of the specimen is formed regularly and the dimensional accuracy is consistent, effectively avoiding the stress concentration problem caused by unreasonable transition section design in traditional molds. The fixture is clamped at the upper and lower ends of the specimen, and the fixture has a V-shaped groove that matches the end of the specimen. At the same time, a fixing steel plate is added to limit the deformation of the fixture. The V-shaped groove fits tightly with the side wall of the specimen, which can effectively limit the lateral movement of the specimen during the tensile process. When testing the dog-bone rod-shaped concrete specimen, the deformation of the tensile area is measured by an extensometer and its rectangular frame fixing device, and the full stress-strain curve of concrete under uniaxial tension can be obtained.