56results about How to "Obstructed movement" patented technology

The invention discloses an electric trench excavator. The electric trench excavator comprises a triangular rack, a sliding bracket, a supporting seat, a lifting mechanism, a power mechanism and a spiral drilling rod, wherein the triangular rack comprises three vertical rods and a plurality of transverse rods; the three vertical rods are triangularly distributed; the transverse rods connect the three vertical rods with one another; wheels and handles are arranged on the rear side surface of the triangular rack; three supporting legs are arranged at the bottom of the triangular rack; the sliding bracket comprises a plurality of guide rods and a supporting seat; the guide rods are fixedly arranged on the triangular rack; the supporting seat is provided with a plurality of sleeves which are sleeved on the guide rods respectively; the lifting mechanism is connected with the supporting seat to drive the sliding bracket to lift; the power mechanism is arranged on the supporting seat and comprises a storage battery, a motor and a speed reducer; the storage battery supplies power to the motor; the speed reducer is connected with the motor; the spiral drilling rod is connected with the speed reducer. The electric trench excavator is simple in structure, convenient to transport, applicable to mountain forest sloping fields with complicated terrain, high in trench excavating stability and low in labor intensity.

The invention belongs to the technical field of epoxy resin, and especially relates to a high-performance epoxy resin and a preparation method thereof. The high-performance epoxy resin comprises a curing agent and is prepared from the following components in parts by weight: 50-80 parts of an epoxy resin polymer, 1-5 parts of a diluent, 1-5 parts of epoxy polyhedral oligomeric silsesquioxane, 1-5parts of a flame retardant, 30-60 parts of filler and 0.1-2 parts of an auxiliary agent, the curing agent is prepared from the following components in parts by weight: 3-12 parts of amino polyhedral oligomeric silsesquioxane, 0-5 parts of curing accelerator and 6-50 parts of amino curing agent. The epoxy resin provided by the invention has high mechanical strength, heat resistance and flame retardance after being cured.

The invention relates to the technical field of packaging materials, in particular to a high-barrier PLA / PBAT composite packaging film. The biodegradable PLA / PBAT composite material is poor in barrierproperty to oxygen and water vapor. Aiming at the problems, the invention provides the high-barrier PLA / PBAT composite packaging film, the molecular structure of the modified nano silicon dioxide contains C=C double bonds, and the modified nano silicon dioxide can be polymerized with the modified graphene in the extrusion granulation process to form a tightly interlaced network structure, so thatthe internal free volume in the PLA / PBAT composite material system is filled to a certain extent; the oxygen blocking performance of the PLA / PBAT composite material is greatly improved; a tightly interlaced network structure formed by the modified nano silicon dioxide and the modified graphene and a molecular chain of polylactic acid are interpenetrated and intertwined together through hydrogen-bond interaction, so that the water vapor blocking performance of the PLA / PBAT composite material is further improved.

The invention discloses a flexible actuator which comprises a cover plate, a bottom plate, a dielectric elastic body, flexible electrodes and aluminum foils. The cover plate is of a circular ring structure; the bottom plate is located on the lower side of the cover plate and is of a round structure, a blind hole is formed in the bottom plate, and an inflation hole is formed in the bottom of the blind hole; the dielectric elastic body is tightly pressed between the lower end face of the cover plate and the upper end face of the bottom plate after being pre-stressed, the portion, between the cover plate and the bottom plate, of the dielectric elastic body is an activity area, the dielectric elastic body is formed by stacking multiple single-layer dielectric elastic main bodies, and the active area of each layer of the dielectric elastic main body is divided into multiple symmetric sub areas in the same way; the upper surface and the lower surface of each sub area are coated with the flexible electrodes, and a distance is reserved between every two adjacent flexible electrodes; the aluminum foils are arranged on the upper surface and the lower surface of each sub area in a one-to-one correspondence mode and are led out from boundaries formed by the bottom plate and the cover plate. The flexible actuator has the advantages of being good in flexibility, large in drive force, simple in structure and good in universality, is simple in structure, can be repeatedly used and is low in cost, free of noise and magnetism and convenient to install.

The invention relates to a polyphenylene sulfide composite material and a preparation method thereof. The polyphenylene sulfide composite material is prepared from the following raw materials in parts by weight: 60-80 parts of polyphenylene sulfide, 20-40 parts of polyamide, 5-10 parts of a compatilizer, 0.5-1 part of an antioxidant, 10-20 parts of a conductivity improver, 20-40 parts of filler, 0.5-1 part of a coupling agent and 0.4-0.8 part of a lubricant, wherein the compatilizer is a styrene-vinyl-butadiene-styrene segmented copolymer grafted maleic anhydride. The polyphenylene sulfide composite material has relatively good rigidity, heat resistance and anti-static performance.

The invention provides a floating-type wave energy utilization device with strong fault tolerance and high efficiency, comprising a duck body floating on the water surface; the duck body is composed of a duck body casing and a central shaft; the duck tail is of a circular arc shape; the shaft center of the central shaft is arranged in the center of the circular arc; the part of the duck head against the wave has a larger volume; an underwater appendage which is fixedly connected with the central shaft and hangs below the duck body is installed below the duck body; a cystic pump serving as an energy switching mechanism is installed inside the duck body; the cystic pump is a closed flexible water sac which is internally injected with liquid, retained with folds and can be stretchable; the water sac is fixed on the central shaft in the duck body and the cystic pump is connected with a cystic piston through a water pipe; the upper end of the cystic piston is connected with the energy switching mechanism; the cystic pump and the cystic piston are not completely filled with liquid; and the underwater appendage is connected with the seabed through an energy storage type mooring system. The invention has low requirement on installation precision, strong fault tolerance, low cost, simple and easily realized installation and simple placement, thus being hopeful to be a floating-type wave energy generating device applied in large scale.

The invention relates to a biological zinc alloy with a fine lamellar eutectic structure and a preparation method thereof, and belongs to the technical field of design and manufacturing of biologicalzinc alloys. The eutectic biological zinc alloy is prepared from the following components in percentage by mass: 98.9 to 99.1 percent of zinc, 0.8 percent of aluminum and 0.1 to 0.3 percent of zirconium. The preparation method comprises the following steps: taking zinc powder, aluminum powder and zirconium powder according to designed components; carrying out ball milling for 2 to 4h at the speedof 250 to 400r / min under a protection atmosphere to obtain mixed powder; preparing the zinc-aluminum-zirconium eutectic biological alloy by adopting an SLM technology under the protection atmosphere.According to the biological zinc alloy provided by the invention, an aluminum-rich phase and a zinc-rich phase in a base body are alternatively separated out and condensed, so that the lamellar eutectic structure is generated in a zinc-aluminum alloy, and the content of zirconium is increased and can further refine the lamellar eutectic structure; in addition, the characteristic of quick solidification rate of an SLM technology is applied and can inhibit nucleation growth, thus further refining the lamellar eutectic structure of the zinc alloy; the lamellar eutectic structure is formed and refined, so that the mechanical properties of the biological zinc alloy are improved, and the application of the biological zinc alloy to the field of tissue repairing is promoted.

The invention provides a metallocene catalyst and a preparation method thereof, and a preparation method of polyethylene nanofiber. The metallocene catalyst is formed by loading metallocene on porous polymeric microsphere through an aluminoxane compound, wherein the aluminoxane compound is methyl aluminoxane and / or modified methyl aluminoxane; the metallocene is represented as a formula (I) in the specification, wherein x is 1 or 2, y is 2 or 3, Cp is a cyclopentadiene group or a cyclopentadiene group derivative, and the cyclopentadiene group derivative is a methyl cyclopentadiene group or an ethyl cyclopentadiene group. Compared with the prior art, the metallocene catalyst has the advantages that the porous polymeric microsphere are used as carrier by the metallocene catalyst, and the porous polymeric microsphere is of a hierarchical pore structure, so that the molecular chain in the polymer product can only grow along the pore canal direction, and the growth in other directions is inhibited so as to obtain a fibrous product, the entanglement of the molecular chains is caused in the existence of hierarchical pores, the movement of the molecular chains is obstructed, and thus the melting point of the obtained polymer is increased.

The invention discloses a phosphorus-containing flame-retardant polyester ionomer / nanocomposite material and a preparation method thereof. The phosphorus-containing flame-retardant polyester ionomer / nanocomposite material is prepared by in-situ polymerization of terephthalic acid or dimethyl terephthalate, ethylene glycol, phosphorus-containing ion monomers (i) or phosphorus-containing ion monomers (ii), inorganic nanoparticles or / and organic modified inorganic nanoparticles. The numbers of phosphorus-containing ion group structure units in the composite material account for 2% to 5% of the numbers of structure units of the terephthalic acid or the dimethyl terephthalate in the composite material. The content of the inorganic nanoparticles or / and organic modified inorganic nanoparticles accounts for 0.5 to 10% of the total mass of the composite material. Meanwhile, the phosphorus-containing flame-retardant polyester ionomer / nanocomposite material is excellent in flame retardance, melt drip resistance and crystallization resistance. The intrinsic viscosity of the phosphorus-containing flame-retardant polyester ionomer / nanocomposite material can reach 0.6dL / g to 1.0dL / g. Thus, the phosphorus-containing flame-retardant polyester ionomer / nanocomposite material can be directly taken as a raw material used for preparing fibers, engineering plastics, thin films and the like.

The invention discloses a pipeline robot which comprises a robot body, wherein the robot body comprises an end part and a tail part; supporting nozzles for supporting the robot body are encircled and distributed on the robot body; a driving nozzle for driving the robot body is arranged on the tail part of the robot body; and the supporting nozzles and the driving nozzle are connected with a spraying source. The pipeline robot disclosed by the invention can be suspended in a pipeline in a manner that the supporting nozzles spray spraying media, and driven to travel in the pipeline in a manner that the driving nozzle sprays a spraying medium, so that the robot can travel in the pipeline without the conventional tracks, wheels or supporting rods; and therefore, a phenomenon that the robot is blocked by foreign matters in the pipeline or due to problems of deformation and the like of the pipeline body is avoided.

The invention discloses a cutting method for fabricated building steel structure machining, and belongs to the technical field of building structures. A workbench, a cutting box, a first supporting table and a second supporting table are included, a limiting assembly is arranged on one side of the second supporting table, the cutting box is provided with a fixed cylinder and a rotating cylinder, and the rotating cylinder is provided with a cutting assembly. A circular sliding rail and a pushing groove are fixed to the corresponding side wall of the cutting box, and a pushing assembly is arranged in a pushing groove. According to the cutting method for fabricated building steel structure machining, the position of a limiting plate is adjusted, so that the cutting length of a steel pipe is determined through the distance between the limiting plate and a cutting knife; and the to-be-cut steel pipe is placed on the first supporting table, the steel pipe is moved, the end of the steel pipe makes contact with the limiting plate on the second supporting table, a cutting assembly is started, the cutting knife conducts cutting around the steel pipe by one circle, after cutting is finished, the limiting effect of a limiting assembly is cancelled, the to-be-machined steel pipe is pushed, the cut steel pipe is forced to move outwards, and the cut steel pipe is discharged.

The invention discloses an electric reel storage device which comprises a frame, wherein two sets of driving and driven chain wheels are symmetrically arranged on the left and right of the frame; two transmission chains are arranged; each transmission chain is arranged on the driving chain wheel and the driven chain wheel; a plurality of reel connection devices for mounting reels on the transmission chains are arranged at the positions corresponding to each transmission chain; the electric reel storage device also comprises a drive device and a control device; the transmission chains are arranged on the frame in an inclining manner; the frame also comprises left and right support rails arranged between the driving chain wheel and the driven chain wheel; one side of each support rail toward the reel is a support surface; the support surface is parallel to the transmission chains; the distance between the support surface and the axis of each reel is suitable for supporting of the support surface to the reel and sliding along the support surface in a conveying process. In the electric reel storage device, not only is the area of a work area increased by arrangement of the inclined transmission chains and the support rails, but also reel unwinding and storing are facilitated; and the tension of the transmission chains can be reduced, and the service life of the chain can be prolonged.

The invention provides an anti-erosion and no sand card fracturing sliding bush which can be connected with an oil pipe and arranged inside a bushing. The anti-erosion and no sand card fracturing sliding bush compromises a shell body. The upper end of the shell body is connected with an upper contact, and the lower end of the shell body is connected with a closed outer cylinder. A plurality of open holes is arranged on the circumferential direction of the closed outer cylinder. The outer shell is provided with a movable piston cylinder. The anti-erosion and no sand card fracturing sliding bush also compromises a sand blasting body. The upper end of the sand blasting body is stuck between the shell body and the piston cylinder. The upper end of the sand blasting body is connected with a lower contact. A nozzle is embedded inside the sand blasting body. The nozzle is provided with a plurality of bell shaped spray holes along the circumferential direction. The spray holes can be communicated with the open holes. The inside of the sand blasting is provided with sliding bush which is used for sealing the spray holes, and the sliding bush is connected with the lower contact detachably. The anti-erosion and no sand card fracturing sliding bush has the advantages of being capable of reducing casing damage during fracturing, and avoiding the sand card when lifting the pope, being thorough in back flushing, and high efficient in fracturing.

The invention provides an electromagnetic clutch. The electromagnetic clutch comprises an upper cover plate, a clutch gear, a return spring, an output spindle and an electromagnetic control mechanismfor controlling the clutch gear to move up and down; the output spindle is rotationally arranged on the upper cover plate; the output spindle is sleeved with the clutch gear which can move up and down; the output spindle is sleeved with the return spring; the return spring is arranged between the upper cover plate and the clutch gear; and the output end of the electromagnetic control mechanism isin drive connection with the top end of the clutch gear. By controlling the clutch gear to move up and down through the electromagnetic control mechanism, the clutch gear can be disengaged or engagedwith other transmission gears according to actual needs, and switching between a manual mode and an automatic mode of the clutch gear is achieved, and torque consumption is low.

The invention relates to an impregnation proofing press, aiming to provide an impregnation proofing press which can be used for proofing by using finished pattern paper of small size so as to save printing paper and has the characteristics of high production efficiency, convenience in use, accurate result and simple structure. According to the technical scheme, the impregnation proofing press is characterized by comprising a reciprocating drying mechanism consisting of a guide rail, a printing paper tightening mechanism, a traction mechanism and a drying oven, and also comprises a lifting rubber tank, a vertical action metering roller component, a gluing roller component and a flattening roller, which are sequentially arranged on a rack from front to back along the guide rail, wherein the lifting rubber tank is arranged below the front part of the guide rail; the guide rail is horizontally fixed on the top of the rack along the front and back directions; the drying oven is fixed on the rack and at the rear part of the guide rail; the printing paper tightening mechanism is arranged on the guide rail through multiple rollers; and the traction mechanism drives the printing paper tightening mechanism to move back and forth in the guide rail in a reciprocating mode.

The invention relates to a room-temperature high-plasticity magnesium-stannum-yttrium-zirconium alloy and a preparation method thereof, and belongs to the technical field of magnesium alloys. The magnesium alloy consists of the following components of, by mass percentage, 0.2-0.4% of Sn, 0.4-0.9% of Y, 0.4-0.6% of Zr, less than or equal to 0.15% of unavoidable impurities, and the balance Mg. The elements of Sn, Y and Zr are added into the magnesium alloy, and the contents of the three elements are controlled simultaneously, so that it is guaranteed that the magnesium alloy finally prepared hasthe high plasticity, the stretching rate is as high as 40%, and it is guaranteed that the magnesium alloy has the moderate yield strength and tensile strength. In the magnesium alloy preparation process, only a small quantity of rare-earth elements are required to be added, so that the plasticity of the magnesium alloy can be remarkably changed; the preparation method of the magnesium alloy is simple, traditional extruding is only required to be carried out at one time, and a complicated processing technology is not required; a smelting furnace and an extruding machine which are used serve asconvectional general equipment, and the transportability is high; and the magnesium alloy is convenient to achieve in industry.

The invention discloses a preparation method of an insulation medium with an improved energy density. The preparation method comprises following steps: dissolving 1,4-phenylene diisothiocyanate into apolar solvent, then adding organic diamine, carrying out reactions for 3 to 6 hours at a room temperature in a nitrogen atmosphere, then adding 4,4'-diaminodiphenyl ether and pyromellitic dianhydride, carrying out reactions for 12 to 18 hours at a room temperature in a nitrogen atmosphere to obtain a polythiourea-polyamide acid random copolymer solution; then paving the polythiourea-polyamide acid random copolymer solution on a copper plate, and heating the copper plate in a gradient mode to obtain a polythiourea-polyamide acid random copolymer. The arrangement mode of polyimide monomers in the copolymer molecular chains is changed to change the dielectric response feature and trap parameters of the insulation medium so as to control the dielectric constant and breakdown field strength, finally the energy density of the insulation medium is controlled or improved; and the insulation medium can be wildly used in many fields: high voltage energy storage devices, pulse power source, aeronautics and astronautics, hybrid vehicles, and the like.

The invention discloses a heat treatment method for improving the dielectric constant of an insulating medium. The method comprises the steps that a polythiourea polymer is dissolved in a polar solvent and uniformly stirred, the polythiourea solution is dropwise added onto a glass sheet through a tape casting method, the glass sheet is placed on a heating bench for treatment for 0.5-1 hour at 55-65 DEG C, then the temperature of the heating bench is increased to 75-85 DEG C, treatment is carried out for 4-6 hours, finally, drying is carried out, and a polythiourea film is obtained; the polythiourea film is treated for 1-4 hours under the high-temperature condition of 100-140 DEG C and then placed in liquid nitrogen for quenching, and the polythiourea insulating medium is obtained. According to the method, the dielectric response characteristic of the polythiourea insulating medium is regulated by changing the heat treatment condition of the alicyclic polythiourea film and regulating the state of a polythiourea internal molecular chain, and the dielectric constant of the insulating medium is finally controlled or improved. The method can be widely applied to the fields of high-pressure energy storage equipment, high-energy pulse generators and the like.

The invention belongs to the technical field of agricultural and sideline products processing, and specifically discloses a rod-shaped agricultural product cutting device, which includes a fixed cylinder in which several accommodating cylinders distributed in a circular shape run through. The fixed cylinder is rotatably connected with a rotating shaft. The cutting knife and the other side are provided with a propulsion mechanism, and the cutting knife is fixedly connected to the rotating shaft. The propulsion mechanism includes a propulsion disc and several propulsion rods, and the lengths of several propulsion rods increase successively. Sliding freely in the sleeve, the sleeve is fixedly connected to the propulsion plate, several movable parts can slide freely in several storage tubes, and the end of the storage tube close to the cutting knife is provided with a snap ring, and the snap ring is provided with a A switch for controlling the power-off of the electromagnet, and a transmission mechanism is connected between the propulsion mechanism and the rotating shaft. The cutting efficiency and cutting precision of rod-shaped agricultural products can be improved by adopting the invention.

The invention discloses a sound insulation and noise reduction composite waved plate tile which is of a two-layer composite structure and comprises a PC layer and a sound absorption layer. The PC layer is prepared from the following raw materials in parts by weight: 60 to 70 parts of PC resin, 15 to 20 parts of polyacrylonitrile-butadiene-styrene copolymer, 0.8 to 1 part of an ultraviolet light absorber, 2 to 3 parts of a composite filler and 0.5 to 0.7 part of a compound flame retardant; thesound absorption layer is made of a polyurethane rigid foam material blended with modified expanded graphite; the invention further discloses a production process of the sound insulation and noise reduction composite waved plate tile. According to the sound insulation and noise reduction composite waved plate tile, the PC layer is prepared by takingPC resin as a polymer matrix, ABS copolymer is adopted for blending modification, the compound flame retardant and the composite filler are used as auxiliary materials, and the PC layer has good heat insulation, mechanical and sound insulation properties; the sound absorption layer has excellent sound-absorbing and sound-insulating effects and flame-retardant performance; the obtained sound insulation and noise reduction composite waved plate tile has good sound insulation, noise reduction and flame retardant properties, and is a high-performanceroof material product.

The invention discloses a reel-to-reel equipment plasma strength deactivation device and method, the device comprises an unreeling cabin, a cell quartz ingot, a coil, a quartz tube, a reeling cabin, an equipment frame and a radio frequency controller, the unreeling device is arranged at one end of the upper end surface of the equipment frame, and the reeling cabin is arranged at the other end of the equipment frame. The reel-to-reel equipment plasma strength deactivation device and method have the advantages that the adopted cell quartz ingot is used for ensuring the reaction and protecting uniform inlet of the air source, accordingly, the particle movement of the plasma inclined unreeling cabin can be effectively hindered, the route of the plasma is well shortened, besides, the microporesin the cell quartz ingot can hinder the plasma route, the plasma effective collision is greatly improved to reduce the plasma strength, the plasma entering the unreeling cabin is reduced, the possibility of corroding the outer surface of a copper foil reel and the end surface of the reel edge is realized, the bombarding of the plasma to the substrate surface is weakened, the internal stress of the film and the substrate is reduced, and the film-forming quality and efficiency are improved.

The invention relates to a high-concentration Re / Ru nickel-based single crystal superalloy with high temperature bearing capacity and high creep resistance, and belongs to a new material for special purposes. The nickel-based superalloy comprises the following components of, in percentage by mass, 5.4-6.2% of aluminum, 7.2-7.8% of tantalum, 2.6-3.5% of chromium, 1.7-2.5% of molybdenum, 4.2-4.8% ofcobalt, 4.2-5.0% of tungsten, 5.8-6.4% of rhenium, 4.7-5.4% ruthenium, 0.07-0.12% of hafnium and the balance nickel. The preparation method of the nickel-based superalloy comprises a heat treatment process. The single-crystal nickel-based alloy has high temperature bearing capacity, good high-temperature mechanical property and creep property, good creep strength and long service life under the ultrahigh-temperature condition, and is a nickel-based single-crystal superalloy suitable for producing blades of hot end parts of high-thrust-ratio aero-engines and gas turbines.

The invention relates to a compound, a preparation method thereof and a quantum dot light-emitting diode. The compound has a structure shown as a formula I, wherein X < + > is a metal cation; Y<-> isan anion connected with an alkyl side chain; wherein n is a positive integer ranging from 100 to 300. The compound is used as an interface modification material, hole injection and transmission efficiency can be improved, or electron transmission is hindered, charge balance can be promoted, the service life of a QLED can be prolonged, and excellent luminous efficiency of quantum dots can be maintained.

The invention discloses a steel bar corrosion inhibitor for marine concrete and a preparation method of the steel bar corrosion inhibitor. The corrosion inhibitor is prepared from 30 to 50 parts of N,N-dimethyl ethanolamine, 20 to 30 parts of polycarboxylic acid terpolymer, 5 to 10 parts of 2-phenylimidazoline quaternary ammonium salt, 10 to 15 parts of hydroxide, 1 to 5 parts of water-based polyaniline, 2 to 5 parts of polyol phosphate and 40 to 60 parts of water, and the pH value is 11 to 13.5. The concrete reinforcing steel bar corrosion inhibitor has good retaining performance for concrete structures, has efficient reinforcing steel bar corrosion inhibition performance, and can be applied to reinforced concrete structures such as harbor engineering, coastal buildings and civil buildings.

The invention discloses a flexible actuator, comprising: a cover plate, which is a ring structure; a bottom plate, which is located below the cover plate, is a circular structure, has a blind hole inside, and an air-filling hole at the bottom of the blind hole; The dielectric elastomer is pre-stretched and tightly pressed between the lower end surface of the cover plate and the upper end surface of the bottom plate. The dielectric elastic body in the middle part of the cover plate and the bottom plate is the active area. The dielectric elastomer consists of multiple layers and single layers. Dielectric elastomers are superimposed, and the active area of ​​each layer of dielectric elastomer is divided into multiple symmetrical sub-areas in the same way; flexible electrodes are coated on the upper and lower surfaces of each sub-area, and the adjacent flexible electrodes are kept Spacing: Aluminum foils are arranged one by one on the upper and lower surfaces of each sub-region, and are drawn out from the boundary formed by the bottom plate and the cover plate. The invention has the advantages of good flexibility, large driving force, simple structure, good versatility, simple structure, repeated use, low cost, no noise, no magnetism and easy installation.

The invention discloses a bistable electromagnetic system applied to a contactor and the contactor thereof. The bistable electromagnetic system comprises a yoke iron shell frame, a coil structure, a magnetic pole and a movable iron core assembly; the magnetic pole is fixed in a middle cavity of the coil structure, and the movable iron core assembly comprises an upper iron core, a permanent magnet and a lower iron core which are connected into a whole and arranged in the middle cavity; and the upper iron core is provided with a driving rod penetrating out of the upper end portion of the yoke iron shell frame, and the driving rod is connected with a moving contact assembly of the contactor. The electromagnetic system adopting the technical scheme has a bistable magnetic holding function and is good in vibration resistance, the coil structure can work by adopting a positive and negative pulse excitation mode, the power-on time is short, the response speed is high, and the power consumption of the coil structure can be greatly reduced. The electromagnetic system is simpler in structural design, convenient to form and manufacture, high in assembly efficiency, beneficial to reducing the size of the electromagnetic system, stable in product performance and capable of reducing the production cost, and thus the use performance and the market competitiveness of the contactor are improved.

The invention discloses a far-infrared rheumatalgia plaster and a production method thereof and relates to the technical field of medicinal plasters. The far-infrared rheumatalgia plaster includes, by weight, 70-80 parts of natural rubber, 10-20 parts of cashew nut shell oil, 2-5 parts of glutaraldehyde, 20-30 parts of rosin, 40-50 parts of zinc oxide, 2-7 parts of Vaseline, 1-5 parts of wool fat, 1-3 parts of an anti-aging agent, 20-25 parts of far-infrared ceramic powder, and 3-7 parts of traditional Chinese medicine powder. The traditional Chinese medicine powder is prepared from, by weight, 7-12 parts of honeysuckle stem, 5-10 parts of anemone raddeana, 7-12 parts of cortex acanthopanacis, 5-10 parts of mulberry twigs, 5-10 parts of panax notoginseng, and 3-7 parts of pawpaw. In the invention, the natural rubber is subjected to blend modification with the cashew nut shell oil which has abundant sources and low cost, and then the natural rubber is subjected to crosslinking condensation under the glutaraldehyde to generate a polymer, so that a crosslinked network structure is formed with rubber hydrocarbon and proteins, thus reducing generation of allergy reaction; in addition, the cashew nut shell oil can improve the anti-aging performance of the natural rubber. The plaster has certain treatment effect on symptoms such as rheumatic joint pain, and is safe and is free of allergy phenomenon.

The invention belongs to the technical field of epoxy resins, and specifically relates to a high-performance epoxy resin and a preparation method thereof. The high-performance epoxy resin includes a curing agent, and the epoxy resin is composed of the following components in parts by weight: 50-80 parts of epoxy resin polymer, 1-5 parts of diluent, 1-5 parts of epoxy clathrate polysilsesquioxane, 1-5 parts of flame retardant, 30-60 parts of filler and 0.1-2 Parts of auxiliary agent; the curing agent is composed of the following components in parts by weight: 3-12 parts of amino cage polysilsesquioxane, 0-5 parts of curing accelerator and 6-50 parts of amino curing agent. The epoxy resin of the invention has higher mechanical strength, heat resistance and flame retardancy after being cured.

The invention belongs to the technical field of cooking fume elimination, and particularly relates to a spraying type cooking fume eliminating device capable of preventing backflow and a use method. The pipe diameters of an inlet, a first pipeline, a second pipeline and an outlet which are arranged inside a backflow-preventing pipeline are increased sequentially, cooking fume flows flow sequentially along the inlet, the first pipeline, the second pipeline and the outlet by the aid of the negative pressure, backflow of the cooking fume flows is avoided by the aid of the negative pressure, different cooking fume flows are handled through control on the change of the pipe diameters of the first pipeline and the second pipeline, and control on the cooking fume flows is divided by the power ofa range hood of a resident.