410results about How to "Improve impact performance" patented technology

The invention relates to the technical field of castable, and discloses a silicon carbide castable which comprises main materials and auxiliary materials, the main materials comprise 30-70 parts of silicon carbide particles, 5-20 parts of micro powder which is silicon carbide micro powder, 5-20 parts of nano aluminum oxide, 5-20 parts of a phase change material and 5-20 parts of reinforced fibers, and the auxiliary materials comprise a binding agent, an additive, a heat stabilizer, a high-heat-conductivity additive and an antioxidant. The phase-change material is a metal alloy phase-change material, and the reinforcing fiber is 5-20 parts of steel fiber. The binding agent is 10-15 parts of pure calcium aluminate cement, and the additive is 3-5 parts. In the preparation process of the silicon carbide castable, the steel fiber, the metal alloy phase change material and the graphite are added, the overall performance of the silicon carbide castable can be remarkably improved, the steel fiber can remarkably improve the toughness and mechanical strength of the silicon carbide castable, the castable can be effectively prevented from being heated to deform at a high temperature, shrinkage is inhibited, and a good prevention and treatment effect on microcracks is achieved; therefore, the overall stability and durability of the pouring material are improved.

Alloy elements are reasonably matched, N and nitrides are added to form elements such as tungsten W, vanadium V, niobium Nb, cobalt Co, rare earth RE and the like for microalloying smelting, a forged and rolled material finished product is subjected to proper heat treatment, and the stainless steel subjected to heat treatment has good heat treatment performance through metallographic observation. According to the stainless steel, nanoscale carbides are separated out in a solid solution state, and fine particles mainly containing nitrides are dispersed and separated out in crystals in a thermodynamic state, so that the material is strengthened and does not diffuse to a crystal boundary, and the room-temperature mechanical property and the high-temperature mechanical property of the material are greatly improved; and when the stainless steel material produced by the method is used for manufacturing related products, the thickness of the stainless steel material can be reduced, and the overall input of the stainless steel material is greatly reduced, so that the large-scale application of noble metal strategic resource nickel is saved, and the aims of saving resources, energy and investment are fulfilled.

The invention relates to the technical field of phase change materials, in particular to an intrinsic flame-retardant solid-solid phase change material and a preparation method and application thereof. The invention provides an intrinsic flame-retardant solid-solid phase change material which is prepared from the following raw materials in parts by mass: 65-75 parts of polyethylene glycol, 7-17 parts of epoxy resin and 18-33 parts of a flame retardant, the flame retardant is prepared from phosphorus pentoxide, expanded graphite and melamine; the epoxy resin comprises epoxy resin glue and an epoxy curing agent. The intrinsic flame-retardant solid-solid phase change material can solve the technical problems that a phase change material is easy to leak and easy to burn.

The invention relates to the technical field of thermal printing head manufacturing, in particular to an energy-impact-resistant heating substrate for a thermal printing head and a preparation method of the energy-impact-resistant heating substrate, and the energy-impact-resistant heating substrate is high-temperature-resistant and capable of reducing adverse effects of thermal stress and is provided with an insulating substrate, a ground coat layer is arranged on the surface of the insulating substrate, and a heating resistor and an electrode wire are arranged on the ground coat layer. A protective layer covers the upper surfaces of the heating resistor body and part of the electrode lead, and the heating resistor body is characterized in that the heating resistor body is an energy-impact-resistant heating resistor body, the heating resistor body is made of a mixture of hafnium tantalum Hf / Ta alloy and SiC, the mass ratio of Hf to Ta in the hafnium tantalum alloy is (1-2): (8-9), the hafnium tantalum alloy accounts for 30-70% of the total mass of the heating resistor body, and the Hf / Ta alloy accounts for 30-70% of the total mass of the heating resistor body. The thickness of the heating resistor body is 10-500 nm, and the resistivity of the heating resistor body is 500-4000 E-8 omega.m.

The invention provides 1900MPa-grade cold-rolled medium manganese steel and a preparation method thereof, and relates to the technical field of high-strength and high-toughness automobile steel. The thickness of the 1900 MPa-grade cold-rolled medium manganese steel ranges from 1.3 mm to 1.5 mm, and the 1900 MPa-grade cold-rolled medium manganese steel is prepared from, by mass, 0.22%-0.25% of C, 6.5%-7.5% of Mn, 1.2%-1.7% of Al, 0.7%-0.9% of Si and Plt. 0.005%, Slt; 0.02% of the total weight; and the balance of Fe and inevitable impurities. The preparation method comprises the steps of raw material preparation, smelting, casting, forging, hot rolling, two-phase region annealing, tempering, cold rolling, quenching and baking treatment. According to the invention, by optimizing the two-phase region annealing process and the quenching temperature, ultrafine-grained ferrite, austenite and martensite microstructures are formed, the strength of the medium manganese steel is greatly improved, the enough percentage elongation after fracture is ensured, and the performance requirements of automobile anti-collision structural components are met.

The invention discloses a cover plate assembly and a single battery, and belongs to the technical field of batteries, the cover plate assembly comprises: a cover plate body having an explosion-proof hole; the explosion-proof valve covers and seals the explosion-proof hole, the explosion-proof valve comprises a connecting part, a first thinning part and a second thinning part, the first thinning part is connected to the second thinning part in a surrounding mode, and a nick is arranged at the connecting position of the first thinning part and the second thinning part. Through the arrangement of the boss, the electrode assembly and the explosion-proof hole can be separated, the explosion-proof hole is prevented from being blocked by the electrode assembly when the battery is subjected to thermal runaway, and meanwhile, the boss is provided with the first through hole, the second through hole and the circulation cavity, so that gas in the battery can conveniently pass through the first through hole, the second through hole and the circulation cavity to impact the explosion-proof valve; the explosion-proof valve can be opened to release pressure, even if the electrode assembly moves towards the direction of the explosion-proof valve, only the second through hole is blocked, gas still enters the circulation cavity through the first through hole, the explosion-proof valve cannot be blocked, and normal exhaust of the explosion-proof valve is guaranteed.

The invention relates to a low-temperature liquid medium storage container and a construction and arrangement method of a metal film on the inner wall of the low-temperature liquid medium storage container, and belongs to the technical field of low-temperature liquid medium storage. The structure of the metal film comprises a top surface film, a right side surface film, a bottom surface film, a left side surface film, four transition surface films, a front surface film and a back surface film which are respectively arranged on the top surface, the right side surface, the bottom surface, the left side surface, four transition surfaces, the front surface and the back surface of the annular side surface of the low-temperature liquid medium storage container, the top surface film, the right side surface film, the bottom surface film and the left side surface film are respectively connected with the four transition surface films to form an annular side surface film; and the front film and the back film are connected through the annular side film to form a totally-closed three-dimensional film.

The present invention discloses an ambient air constant-current automatic sampling system and a sampling method thereof. The system includes a vacuum sampling tank, a buffer container and a switching valve. The buffer container is respectively connected to the vacuum sampling tank and the atmospheric environment through the switching valve. Through the switching control of the switching valve, the buffer container is alternately connected to the atmospheric environment and the vacuum sampling tank to achieve the pressure balance of the sampled gas. The present invention also discloses a constant-current ambient air sampling method. The present invention breaks the foreign technical monopoly on high-precision atmospheric constant-current sampling devices, ensures the accuracy of atmospheric sampling flow control, ensures the inertness of the overall gas flow path, has flexible flow control and adjustment methods, uses commonly used industrial mass-produced devices and materials, realizes consumable-free and easy maintenance, and constructs an economical and efficient fully automatic ambient air constant-current automatic sampling system, contributing to the country's atmospheric environment monitoring and governance.

The invention provides a full-biodegradable composite film and a preparation method thereof. The full composite membrane comprises an outer layer, a middle layer and an inner layer, wherein the outer layer comprises modified calcium carbonate, PLA, PBAT and an epoxy chain extender; the middle layer comprises modified montmorillonite, PLA (polylactic acid), PBAT (poly (butylene adipate-co-terephthalate)), PPC (polypropylene carbonate) and an epoxy chain extender; the inner layer comprises PLA (polylactic acid), PBAT (poly (butylene adipate-co-terephthalate)), an epoxy chain extender and an optional anti-blocking agent. The preparation method of the raw materials of the middle layer comprises the following steps: (i) dividing an epoxy chain extender used by the middle layer into an epoxy chain extender A and an epoxy chain extender B, and mixing PPC, modified montmorillonite and the epoxy chain extender A to prepare a first master batch of the middle layer; (ii) mixing PLA, PBAT and an epoxy chain extender B to prepare a middle-layer second master batch; and (iii) uniformly mixing the middle-layer first master batch and the middle-layer second master batch, extruding and granulating to obtain a middle-layer raw material. The full-biodegradable composite film prepared by the preparation method disclosed by the invention is good in uniformity and quality.

The present invention relates to the field of photovoltaic equipment, and in particular to a water photovoltaic equipment with a protective function, including a floating photovoltaic equipment, a protective plate, a pressure plate and a collection box; the front side of the floating photovoltaic equipment is detachably connected with a protective plate to prevent seawater from splashing when the waves hit; the protective plate is arranged to be bent forward; the front side of the floating photovoltaic equipment is provided with a pressure plate; the floating photovoltaic equipment is provided with a plurality of collection boxes to prevent the equipment from being contaminated by garbage; the pressure plate is detachably connected to the collection box. The present invention realizes guiding the waves to impact downward by setting the protective plate to be bent forward, while dispersing the impact force of the waves hitting the buoy, and the highest point of the protective plate is always higher than the height of the waves rolling up, so as to prevent the splashed seawater from adhering to the photovoltaic panel.

The invention belongs to the technical field of refractory materials, and discloses a high-temperature high-strength ceramic wear-resistant castable as well as a preparation method and a construction method thereof. The high-temperature high-strength ceramic wear-resistant castable is prepared from the following raw materials in percentage by mass: 14 to 22 percent of mullite with the particle size of 8 to 5mm, 16 to 24 percent of mullite with the particle size of 5 to 3mm, 13 to 18 percent of brown aluminum oxide with the particle size of 3 to 1mm, 12 to 19 percent of brown aluminum oxide with the particle size of 1 to 0.074 mm, 16 to 25 percent of brown aluminum oxide with the particle size of less than or equal to 0.074 mm, 3 to 7 percent of activated aluminum oxide powder, 4 to 7 percent of submicron SiO2 powder and 0.3 to 0.6 percent of pure calcium aluminate cement, and rare earth modified titanium-aluminum alloy fibers accounting for 1-1.5% of the total mass of the raw materials, a water reducing agent accounting for 0.05-0.15% of the total mass of the raw materials, explosion-proof fibers accounting for 0.03-0.1% of the total mass of the raw materials and water accounting for 3.5-4.5% of the The submicron SiO2 powder is used as a binding agent to endow the castable with certain normal-temperature strength, the activated alumina powder is combined to provide high-temperature strength, the brown fused alumina and the sintered mullite are used as aggregates, and the rare earth modified titanium aluminum steel fibers are combined to endow the castable with high-temperature, high-strength and wear-resistant properties.

The invention relates to the technical field of coatings, and discloses a preparation method and application of an organosilicon waterproof coating. The organic silicon waterproof coating is obtained by uniformly stirring and mixing the solvent, the epoxy resin, the pigment filler, the dispersing agent, the defoaming agent, the polyether modified organic silicon polystyrene and the curing agent. According to the invention, polyether modified organosilicon polystyrene is added into the epoxy resin coating, crosslinked polystyrene has very high mechanical strength, a molecular main chain contains flexible siloxane, a side chain contains a polyether chain segment of a three-dimensional branched molecular chain, and the polyether chain segment and an epoxy resin molecular chain form a physical space crosslinking effect; according to the present invention, the main chain organosilicone polystyrene has characteristics of good toughening effect, significantly improved tensile strength, significantly improved elongation at break, significantly improved bending strength and significantly improved impact property, and the main chain organosilicone polystyrene has strong hydrophobicity, such that the hydrophobicity can be improved when the main chain organosilicone polystyrene is added into the epoxy resin coating material, and the water absorption rate can be easily reduced, and the water resistance can be easily improved.

The invention provides an organic silica gel mechanical design method based on a load spectrum. The organic silica gel mechanical design method comprises the following steps that 1, a mechanical parameter library of impact resistance is constructed, and the value range of corresponding mechanical parameters is determined; 2, constructing a material formula set of the organic silicon gel, and determining formula main control parameters influencing the performance parameters of the organic silicon gel and the value range of the formula main control parameters; 3, constructing a corresponding performance parameter library of the organosilicone gel, and determining the value range of key performance parameters; 4, constructing a design variable and mapping relation model of'load environment-material formula-mechanical parameter-performance parameter 'of the organosilicone gel; and 5, constructing an objective function of the impact resistance mechanical optimization design of the organic silicon gel, and carrying out multi-objective optimization solution and validity verification of the objective function. According to the method, the optimal design of the shock resistance of the organic silicon gel can be quickly realized, so that the high matching with the actual shock load environment of the organic silicon gel is realized.

The invention relates to the technical field of polystyrene materials, in particular to polystyrene plastic for an SMT carrier tape and a preparation method of the polystyrene plastic. The problems that in the prior art, SMT carrier tape polystyrene plastic is insufficient in mechanical property and poor in aging resistance are solved. The preparation method comprises the following steps: introducing alkenyl-terminated polysiloxane into a polystyrene main chain, and carrying out heat treatment to obtain modified polystyrene; carrying out modification treatment on polycarbonate by using an anti-aging agent to obtain modified polycarbonate; the preparation method comprises the following steps: modifying nano titanium dioxide by using KH-550 to obtain modified titanium dioxide, and carrying out melt extrusion on modified polystyrene, modified polycarbonate, modified titanium dioxide and an auxiliary agent to obtain the polystyrene plastic for the SMT carrier tape. By adjusting the part ratio of polystyrene to alkenyl-terminated polysiloxane and the use amount of modified polyethylene and modified polycarbonate, the mechanical property of the polystyrene plastic is improved; the anti-aging agent is introduced into the polycarbonate structure, so that the anti-aging capability of the plastic is improved.

The invention provides a fin unit, a heat exchange fin and a heat exchanger, and relates to the technical field of heat exchangers. Each fin unit comprises a first bottom plate, a second bottom plate, a first spoiler, a second spoiler, a third spoiler and a fourth spoiler; the first bottom plate, the first spoiler, the second spoiler and the second bottom plate are sequentially connected, the second bottom plate, the third spoiler, the fourth spoiler and the second bottom plate are sequentially connected, and projections of the second spoiler and the third spoiler on a first plane are arranged in a crossed mode. The inclination angle of at least one of the first spoiler, the second spoiler, the third spoiler and the fourth spoiler is smaller than that of the other spoilers, so that fluid can strongly flow on the spoilers with smaller inclination angles in the flowing process of the fluid in the heat exchange fins; therefore, the fluid can impact the tops and the bottoms of the fin units more strongly, and the heat exchange efficiency is improved.

The invention relates to the technical field of composite materials, in particular to a high-strength elastic composite aerogel and a preparation method thereof.Negative Poisson ratio composite aerogel designed with a centripetal structure cooperating with a supramolecular system is prepared, the supramolecular system design is adopted, a hydrogen bond network of nanofibers serves as a weak interface bonding layer, and the elastic composite aerogel with the high strength is prepared. The fiber and the silane-based material interface are covalently interlocked to form a firm supramolecular system, and a centripetal structure is cooperated to realize a coupling effect between resistance and deformation. Through the cooperative strategy, the composite aerogel obtains excellent specific modulus and good recovery speed, and can be qualified for high-impact and high-strength application scenarios.

The utility model provides an unattended distribution room control cabinet, and belongs to the technical field of control cabinets. The unattended distribution room control cabinet comprises a cabinet body and a driving part, a monitoring box is fixedly connected to the upper portion of the cabinet body, an observation window is formed in the monitoring box, a protective door is arranged on the observation window, a rotary cylindrical transparent cover is arranged in the protective door, the transparent cover is in power connection with the driving part, and the driving part is in power connection with the transparent cover. A camera is arranged in the transparent cover, and the transparent cover is in friction connection with the protective door. According to the application, the vibration sensor is used for monitoring the vibration of the cabinet body so as to trigger the driving piece to drive the transparent cover to rotate, and the protective door is driven by friction to open the observation window, so that the camera can observe the underneath condition through the transparent cover, and the transparent cover continuously rotates to change the exposed position so as to conveniently bear impact; and dirt on the surface can be scraped by using the protective door, so that the monitoring reliability of the camera is further improved.

The invention discloses an inertia flywheel control method and system based on reinforcement learning, and the method comprises the steps: storing a conversion experience multi-tuple obtained through an interactive simulation environment and a neural network into an experience pool, and randomly sampling a set number of experience multi-tuples from the experience pool at the current moment to update the neural network; according to the reward in the current experience pool, judging whether a neural network updating ending condition is satisfied, if so, taking the updated neural network as a trained neural network, otherwise, continuing to update the neural network until the ending condition is satisfied; and inputting the state quantity of the output end of the inertia flywheel, which needs to be subjected to control quantity calculation, into the trained neural network to obtain an action, and obtaining the control quantity to be input into the inertia flywheel based on the action and the torque set value. According to the scheme of the invention, the neural network can adjust the strategy according to the actual performance, and the motion corresponding to the state quantity of the output end of the inertia flywheel can be predicted and calculated more accurately.

The invention discloses an epoxy plaster for repairing high-strength concrete for electric power engineering, which comprises a component A and a component B. The mass ratio of the component A to the component B is (8-12): 1. The component A comprises the following components in parts by weight: 35-50 parts of bisphenol A epoxy resin, 15-25 parts of multifunctional epoxy resin, 10-15 parts of a functional diluent, 20-40 parts of filler, 1-5 parts of a coupling agent and 1-3 parts of an auxiliary agent; the component B comprises the following components in parts by weight: 45-65 parts of hydrophobic amine modifier curing agent, 20-40 parts of filler, 1-5 parts of coupling agent, 1-5 parts of adhesion promoter and 1-5 parts of assistant. The epoxy plaster is a modified high-molecular high-strength repairing and protecting material, and has the advantages of high bonding force, high temperature resistance, durability, impermeability, impact resistance, compactness, extremely high bonding force and extremely strong waterproof effect.

The invention discloses a rubber and plastic composite retaining dam bag material as well as a preparation method and application thereof, and belongs to the technical field of rubber retaining dams. The rubber and plastic composite retaining dam bag material sequentially comprises a rubber sealing filling layer, an ultra-high molecular weight polyethylene fiber layer, a bonding transition layer and an ultra-high molecular weight polyethylene protection layer from inside to outside. The thickness of the rubber sealing filling layer is 3.2 + / -0.2 mm, the thickness of the ultra-high molecular weight polyethylene fiber layer is 10 + / -0.5 mm, the thickness of the bonding transition layer is 1 + / -0.1 mm, and the thickness of the ultra-high molecular weight polyethylene protection layer is 10 + / -0.5 mm. The rubber and plastic composite retaining dam bag material has the advantages of aging resistance, wear resistance, impact resistance and stable chemical property, the service life of a dam bag can be effectively prolonged, and meanwhile, the maintenance and management cost is reduced.

The invention discloses liquid hydrocarbon fuel combustion equipment and a supercritical carbon dioxide circulation system, the liquid hydrocarbon fuel combustion equipment comprises a nozzle, a combustion chamber and a rotational flow assembly, the rotational flow assembly comprises a first-stage pipe, a second-stage pipe, a first-stage cyclone, a second-stage cyclone and a third-stage cyclone, and the first-stage pipe and the second-stage pipe are both scaling venturi pipes. The supercritical carbon dioxide circulation system comprises fuel supply equipment, pure oxygen supply equipment and a circulation assembly, mixed gas of carbon dioxide and water vapor generated by combustion of the liquid hydrocarbon fuel combustion equipment is circulated through the circulation assembly to obtain high-purity carbon dioxide, and the high-purity carbon dioxide is divided into three paths to flow into a first-stage swirler, a second-stage swirler and a third-stage swirler; the carbon dioxide flowing into the second-stage cyclone is uniformly mixed with oxygen from pure oxygen supply equipment before flowing into the second-stage cyclone. The combustion ignition delay period and the mixing time can be prolonged, a standing vortex high-temperature rapid reaction area is formed, the problem that the combustion speed is low in the concentrated carbon dioxide atmosphere is solved, and the supercritical carbon dioxide circulation efficiency is improved.

The invention discloses a railway wagon coupler buffer, and belongs to the technical field of coupler buffers, the coupler buffer comprises a buffer and a coupler knuckle arranged on the buffer, one end, far away from the coupler knuckle, of the buffer is fixedly provided with a slave seat plate, the coupler knuckle is sleeved with an impact seat, and auxiliary mechanisms are symmetrically arranged between the impact seat and the slave seat plate; the auxiliary mechanism comprises a connecting rod arranged on the impact seat, and a buffer cylinder used for being arranged on the connecting rod in a sleeving mode is installed on the seat plate. By designing multi-stage buffering, the situation that the single-stage load of the buffer is too heavy can be reduced, so that frequent application of limit load is reduced, the service life of the buffer is prolonged, each stage of buffering can play a role, the pressure of each impact stage is relieved, and when a vehicle is connected, the buffering effect is good. The buffer firstly provides softer buffering force to reduce the initial impact, and the buffering force can be gradually increased in the subsequent buffering stage so as to cope with stronger impact.

The invention belongs to the technical field of preparation of a porous gas diffusion layer in an electrolytic cell, and particularly relates to a preparation method of an anode gas diffusion layer porous electrode, which is characterized in that a manganese dioxide / Ti electrode with a porous structure is prepared by coating and sintering a coating solution A containing manganese salt on a titanium substrate. The porous manganese dioxide supporting layer serves as micropore extension of the porous transmission layer, the impact effect of water flow and air flow on the proton exchange membrane is weakened, transmission of an oxygen evolution intermediate in the hydrogen production process is facilitated, and the proton exchange membrane is suitable for strong air flow and liquid impact under high current density.

The invention provides poly (butyl acrylate), a preparation method and ASA (acrylonitrile styrene acrylate) resin. The preparation method of the poly (butyl acrylate) comprises the following steps: S1, mixing butyl acrylate, an RAFT reagent, an emulsifier, an optional electrolyte and water, and then adding an initiator and a reducing agent for reaction to obtain a PBA seed emulsion; s2, mixing butyl acrylate, an RAFT reagent, an emulsifier, an initiator and water to obtain a pre-emulsion; s3, a reducing agent and the pre-emulsion are added into the PBA seed emulsion for a reaction, and poly (butyl acrylate) is prepared. The prepared poly (butyl acrylate) is high in molecular weight, narrow in molecular weight distribution, high in branching degree and good in rubber toughening effect, the ultrahigh impact ASA resin can be prepared with a small amount of rubber powder, the impact strength is larger than 400 J / m, the weather resistance is extremely good, and dE is smaller than 15 after an ultraviolet aging test is conducted for 500 h.

The utility model relates to the technical field of PU synthetic leather production lines, and discloses a washing device of a PU synthetic leather wet process production line, which comprises a working table, a movable groove is arranged at the center of the working table, a T-shaped groove is arranged on the bottom wall of the movable groove, a T-shaped convex block is connected inside the T-shaped groove in a sliding mode, and the T-shaped convex block is connected with the working table in a sliding mode. The top of the T-shaped protruding block is fixedly connected with a cleaning box, the side wall of the cleaning box is rotationally connected with an inner roller shaft, the surface of the inner roller shaft is slidably connected with an outer roller shaft, the surface of the outer roller shaft is sleeved with a leather belt, and the right side of the top of the workbench is fixedly connected with a collecting box. The left side of the top of the workbench is fixedly connected with a first stand column. According to the washing device of the PU synthetic leather wet production line, the shaking mechanism is arranged, rapid reciprocating movement of the ejector rod is achieved, and therefore high-frequency vibration of clean water in the cleaning box is achieved, the surface impact and contact duration of the clean water and a leather belt is prolonged, and the cleaning effect is improved.

The invention relates to the technical field of refrigerator inner container production, and discloses a material for manufacturing a refrigerator inner container plate, the material comprises PETG, aluminum powder and a modified material, and the modified material comprises PCTG, a flexibilizer, an antioxidant, an auxiliary antioxidant, a lubricant and a weather-proof agent. In the application, the impact strength and heat resistance of the plate can be improved, the yield of the refrigerator liner is improved, and the production cost is reduced. The invention further discloses a refrigerator inner container and a refrigerator.

The invention relates to the technical field of seismic mitigation and isolation, and discloses a building high-damping magneto-rheological seismic isolation device which comprises a bottom plate, a vertical seat, a main plate and a reset column, through grooves are formed in the two sides of the upper surface of the bottom plate, and two sleeve blocks are slidably clamped in the through grooves. According to the high-damping magneto-rheological shock insulation device for the building, the rigidity and damping of the shock insulation support are controlled by changing the size of a magnetic field, the resonance phenomenon is effectively avoided, meanwhile, when a sliding block moves downwards, a third gear is driven to rotate, meanwhile, the third gear can drive a second gear to rotate, and therefore the shock insulation effect is improved. When a sliding block moves, a rack can carry a sleeve block to synchronously move, a reset spring is driven to stretch, the pulling force of the reset spring is applied to the sleeve block, the rack is driven to move, and a multi-buffering and damping mechanism and multi-stage buffering and damping are achieved. And the vibration can be counteracted through the reset spring and the first magneto-rheological damper, so that different types of vibration are adapted, and the vibration isolation effect is achieved.

The cold work die steel comprises the following components in percentage by mass: 0.95 to 1.05 percent of C, 0.80 to 1.2 percent of Si, 0.40 to 0.50 percent of Mn, 7.00 to 9.0 percent of Cr, 2.0 to 2.5 percent of Mo, 0.25 to 0.35 percent of V, 0.50 to 0.80 percent of W, 0.005 to 0.01 percent of Y, less than or equal to 0.25 percent of Ni, less than or equal to 0.15 percent of Cu, less than or equal to 0.025 percent of P, less than or equal to 0.008 percent of S and the balance of iron and inevitable impurities. Wherein the matrix structure of the cold work die steel comprises martensite and lower bainite, and the volume fraction of the lower bainite is 10-20%. According to the cold work die steel and the preparation method thereof, by adding the heavy rare earth element Y, the effects of purifying a matrix and improving inclusions of the rare earth element are exerted, and the toughness and impact performance of steel are improved; meanwhile, strong carbide is added to form an element W, decarburization is reduced, and wear resistance is improved; the element W can prevent tempering softening, and the high-temperature hardness of the tempered steel is improved; and meanwhile, the total content of the C element and the W element is reasonably controlled, and the carbide distribution state of the cold work die steel is optimized, so that the cold work die steel has better toughness.

The invention discloses a core-shell toughening agent as well as a preparation method and application thereof, and the preparation method of the core-shell toughening agent comprises the following steps: obtaining styrene-butadiene latex with double particle size distribution; grafting: mixing water, an emulsifier, acrylate, methyl methacrylate, a cross-linking agent, an initiator, sodium formaldehyde sulfoxylate and styrene-butadiene latex for first-step grafting, then adding sodium formaldehyde sulfoxylate and a monomer mixture containing the initiator, the cross-linking agent and styrene, and performing second-step grafting to obtain an emulsion; and demulsifying, namely demulsifying the emulsion by adopting inorganic salt to produce sand, and filtering and drying to obtain the core-shell toughening agent. The modified plastic has the advantages of effectively improving the low-temperature impact resistance and yellowing resistance of the plastic when being applied to the plastic, and the like.

The invention relates to the technical field of oil field water distributors, and discloses an eccentric water distributor and an anti-blocking assembly thereof.The eccentric water distributor comprises the anti-blocking assembly and a shell, the shell comprises an inner pipe and an upper outer pipe, a plurality of blind holes are formed in the upper surface of the inner pipe, and a vibration assembly used for generating vibration is arranged in each blind hole; a plurality of nozzles are arranged on the bottom surface of the upper outer pipe, a plurality of water spraying grooves are formed in the inner wall of the inner pipe, the inner wall of each water spraying groove is an inclined plane, and a pressure valve is arranged in each water spraying groove; through the mutual cooperation of the spray head and the water spray tank, two streams of opposite water flow can be generated, the two streams of water flow collide together, the inner wall of the cavity collapses firstly to form bubble interception, a rapid jet flow liquid column is generated in the center, and jet flow and collapse of the cavity can generate strong impact and cleaning effects on the inner wall of the cavity; therefore, the situation that after water injection is completed, part of sundries can flow back into the eccentric water distributor along with water, subsequent water is evaporated to form cakes, and a water conveying opening is prone to being blocked is avoided.