82results about How to "Prevent oxidation failure" patented technology

The invention discloses PVC / PE / PVCD solid medicine using composite hard sheet manufacturing technology. It includes the following steps: unreeling for PVC basis material; corona treatment for its surface; coating adhesive; drying; unreeling for PE film; compositing the PVE basis material and PE film; solidifying; dying; corona treatment for the PE film surface; coating adhesive; coating PVCD glue; drying to form PVCD film; repeating coating the PVCD glue on the PE film; drying; rolling, solidifying to form PVCD film again; patting cut and detecting.

The invention provides a low-melting-point metal thermal-conducting paste as well as a preparation method and an application thereof. The prepared low-melting-point metal thermal-conducting paste comprises a low-melting-point metal, an antioxidant and sodium gallium. The low-melting-point metal has high thermal conductivity, so that excellent thermal conducting performance of the thermal-conducting paste can be guaranteed; the antioxidant can restrain the low-melting-point metal from being oxidized by air and prevent the thermal-conducting paste from being gradually oxidized and losing efficacy during a use process; and the sodium gallium can reduce surface tension of the low-melting-point metal, can improve viscosity of the thermal-conducting paste, can enhance the characteristic of easiness in applying the thermal-conducting paste, and can prevent the flowing and leaking phenomena of the thermal-conducting paste during the use process. The low-melting-point metal thermal-conducting paste as well as the preparation method and the application thereof can be widely applied to the thermal-conducting and heat-dissipation fields, such as aerospace thermal control, advanced energy, electronic information and the like, which require for reducing thermal contact resistance.

The invention discloses a gang saw cutting head for cutting granites and a manufacture method thereof. The gang saw cutting head for cutting the granites comprises a cutting head body and a welding transition body, wherein the welding transition body is a metal bonding agent sintered together, and the outer surface of a combined body formed by sintering the cutting head body and the welding transition body is provided with a hard wear-resisting phase. By arranging the welding transition body, the problem of the welding quality caused by large difference in metal components of the cutting head body and steel bands is solved, and the cutting head can obtain firm swarf pushing force. By arranging the hard wear-resisting phase, the abrasive resistance of the surface of the cutting head body is improved remarkably, carcass metal on an inner layer is prevented from being abraded, the stable and continuous cutting process is ensured, accordingly mechanical holding force of the metal bonding agent to diamond grains is strengthened effectively, the processing efficiency of a tool is improved, and the service life is prolonged. In the forming process of the hard wear-resisting phase, the diamond grains in the cutting head body and the mechanical holding force of the metal bonding agent are greatly strengthened, and the requirement of cutting the granites is met.

The invention discloses selective laser fusion molding equipment for a ceramic material. A closed molding and processing cabin for forming a worktable is arranged in the equipment. According to the equipment, lifting motion of a molding cylinder is replaced by vertical motion of a scraper, a height adjusting device of the scraper is controlled by an industrial personal computer, a vacuum pump and an argon supply device are respectively conducted with the closed cabin through a pipeline; a laser scanning system is arranged on an upper surface of the closed cabin; a dynamic focusing system and a galvanometric scanning system in the laser scanning system are controlled by the industrial personal computer so as to realize real-time focusing; an induction heating system is arranged below the lower surface of the cabin, namely the worktable surface and is similarly controlled by the industrial personal computer, so that constant temperature heating can be realized. Preheating is performed through induction heating, the problem that ceramics are easily cracked due to extremely high temperature gradient in the molding process is solved, the oxygen content is strictly controlled due to atmosphere protection, influence on the performances of the parts of the equipment is avoided, and the whole equipment is simple and is conveniently sealed due to a special powder spreading structure.

The invention relates to anti-pitting self-repairing gear grease. The anti-pitting self-repairing gear grease comprises, by weight, 92-97% of a gear grease body and 3-8% of a self-repairing addition agent. According to calculation of the total mass of 100%, the self-repairing addition agent comprises, by weight, 50-70% of antioxidant, 10-25% of an anti-wear agent, 5-10% of an extreme pressure agent and 5-20% of organic molybdenum. The anti-pitting self-repairing gear grease has excellent antioxygen performance and extreme pressure wear resisting performance at different temperatures, can effectively prevent the surface of a gear from generating pitting, and can have a function of repairing the worn surface of the gear to a certain degree, so that the service life of the gear is prolonged.

The invention provides a lithium ion battery. The lithium ion battery comprises a positive pole piece, a negative pole piece, an isolating membrane and an electrolyte, wherein the positive pole piececomprises a positive current collector and a positive active material layer which is arranged on the surface of the positive current collector and contains a positive active material, an inorganic dielectric layer which does not contain a binder is arranged on the surface of the positive active material layer, and the resistance of the positive pole piece is not higher than 8 ohm. The inorganic dielectric layer has good chemical stability, the stable existence can be realized under a high voltage, the change of the surface structure of the active substance caused by the over-high voltage of the positive electrode active material can be slowed down, a cathode active substance with strong oxidizing property is effectively prevented from being directly contacted with an additive with poor stability in the electrolyte, a solvent and the outer surface of the isolating membrane, so that the gas production rate of the lithium ion battery is reduced, and failure of a polymer on the surface layer of the isolating membrane under high voltage is avoided; and the resistance of the positive pole piece is not higher than 8 ohm, so that relatively low internal resistance, relatively small polarization and relatively good cycle performance and rate capability of the battery are ensured.

The invention discloses a biomass granular carbon-based fertilizer and a preparation method thereof. The fertilizer is prepared from the following components in parts by weight: 20-30 parts of fecal residues, 35-40 parts of a straw mixture, 12-16 parts of castor bean meal, 15-23 parts of furfural residues, 7-9 parts of sulfonated lignin-vinyl acetate, 6-8 parts of arbuscular mycorrhiza, 21-25 parts of medium elements and 4-5 parts of trace elements. The preparation method comprises the following steps: carbonizing and thermally decomposing straw under the protection of nitrogen, controlling the strict anaerobic condition, performing liquefying, fermenting the fecal residues and the furfural residues with methane, performing pre-leaching with alkali liquor, expanding the castor bean meal with steam, and finally, homogenizing, granulating and drying all the materials to obtain the biomass granular carbon-based fertilizer. Methane, hydrogen, carbon monoxide, ethanol, butanol and other fuel are separated by carbonization thermal decomposition and methane fermentation, the added value of biomass raw materials is improved, and the produced carbon-based fertilizer has balanced and comprehensive nutrient elements, can release fertility continuously for a long time, and is easy to be absorbed and utilized by crops.

The invention discloses a thermal power measuring device. The thermal power measuring device comprises a constant temperature system, a heat measurement system, a reaction system, a heat calibration system, a gas supply system and a data collecting and control system. The constant temperature system comprises a temperature controller and a constant temperature furnace connected with the temperature controller. A heat measuring cylinder is arranged in the constant temperature furnace. A soaking block is arranged in the heat measuring cylinder. A reaction tank cavity and a reference tank cavity are formed in the soaking block and are symmetrical about the axis of the soaking block. The reaction system comprises a reaction tank sample holder and a reference tank sample holder. The calibration system comprises a reaction tank calibration sample holder and a reference tank calibration sample holder. The reaction tank calibration sample holder and the reference tank calibration sample holder respectively comprise a tubular sample rod and a soaking body II arranged at one end of the tubular sample rod. A ceramic tube is arranged in each soaking body II. A thermal resistor is wound around the ceramic tube of the reaction tank calibration sample holder. The thermal resistor is connected with four leads. The gas supply system comprises a reference gas source and a reaction gas source. The reaction tank cavity and the reference tank cavity are distributed symmetrically in the radial direction, and the influence of axial temperature change of the constant temperature furnace on the measurement of thermal power is offset.

The invention discloses a test-paper-strip-based automatic paper delivery device. A shell of the automatic paper delivery device is divided into two chambers; a specially-shaped rotating shaft, a test paper disc, a motor, a nylon tape guide disc, a guide wheel, a marking detection device and a separation guiding mechanism are arranged in one chamber; the test paper disc sleeves the specially-shaped rotating shaft, a test paper strip is wound on the test paper disc, the other end of the test paper strip goes around the guide wheel to be wound on the nylon tape guide disc, the nylon tape guide disc fixedly sleeves a motor rotating shaft, the marking detection device is arranged near the test paper strip, and the test paper strip is wound outside the guide wheel and is provided with the separation guiding mechanism; and a control circuit, an indicator light and a button are arranged in the other chamber; and the control circuit is connected with the button, the motor, the marking detection device and the indicator light respectively. According to the test-paper-strip-based automatic paper delivery device, the test paper can be delivered out automatically, oxidation deactivation of the test paper or cross contamination among test paper can be effectively avoided, the processes such as package tearing are removed, the automatic paper delivery device is simple, has high efficiency and can remind users of replacing the test paper disc timely.

The invention discloses a preparation method of a nanometer chain-like core-shell type nickel / polyaniline composite wave absorption material. The preparation method comprises the following steps of utilizing the reducibility of hydrazine hydrate, reducing nickel salt with liquid phase under normal pressure, and preparing a nickel nanometer chain which is formed by self assembling spherical particles in uniform size; then coating the surface of the nanometer chain with polyaniline by using an in-situ polymerization method, and acquiring the nanometer chain-like core-shell type nickel / polyaniline composite wave absorption material, wherein the nanometer chain-like core-shell type nickel / polyaniline composite wave absorption material is of a core-shell structure and takes a magnetic metal nickel nanometer chain as a core and the polyaniline as a conductive polymer as a shell layer. According to the preparation method provided by the invention, the nanometer chain which is formed by self assembling the nickel nanospheres is utilized as a magnetic core, the magnetic anisotropy is strengthened through the geometric effect, and the microwave permeability of a core-shell structure whole body is further improved in the premise of ensuring dielectric loss, so that impedance matching of the wave absorption material is improved, surface reflection of electromagnetic waves is lowered, and the wave absorption performance of the material is improved.

The invention provides a high temperature resisting deep-circulation lead acid battery, whose positive grid alloy employs silver-bearing alloy with high temperature and corrosion resistance and dehydration prevention, and rare earth oxide yttria is added into the anode lead paste formula, and a mixed expanding agent with high temperature resistance and oxidation prevention is added into the cathode lead paste formula. A battery housing and a top cover are made of PC / ABS alloy plastic with high temperature resistance. In order to satisfy the tight assembling requirement of the battery, the pole group is banded and packed into the housing, thereby guarantying the pole group assembling pressure does not change obviously during the usage period of the battery. The battery has effectively improved high temperature resisting deep circulation performance and service life, and is suitable for application in environment above 45 DEG C.

The invention discloses a high-sensitivity film thermocouple sensor chip and a making method thereof. The high-sensitivity film thermocouple sensor chip comprises a shell. The shell is internally provided with a cavity for placing an alloy film and an annular hole for placing graphene. The annular hole is at the periphery of the cavity. The cavity is internally provided with an alloy film which is made into a film thermocouple. The annular hole is internally provided with graphene. The shell includes three sections: a test probe, a middle circular truncated cone, and a lead end. By designing a new sensor structure, temperature signals can be measured for a long time in a dynamic high temperature field. Through forced heat transfer, a large thermal gradient is formed between the cold end and the hot end of the thermocouple film, and the sensitivity of the film thermocouple is enhanced. The sensor chip has the characteristics of high sensitivity, small size, resistance to high temperature, anti-oxidation, high Seebeck coefficient, and applicability to dynamic test. The problem in the prior art that the film thermocouple is of low sensitivity due to too high temperature at the cold end in a dynamic high temperature field test environment is solved.

The invention relates to a nutritional supplement with effects of relieving alcoholism and protecting livers, and a preparation method of the nutritional supplement, and belongs to the technical field of food processing and preparation. The nutritional supplement with the effects of relieving alcoholism and protecting livers comprises the following raw materials in percentage by weight: 10.00-40.00% of maltodextrin, 10.00-35.00% of enzymolysis oat powder, 8.00-25.00% of whey protein, 5.00-50.00% of granulesten, 1.00-10.00% of phosphatidylcholine, 2.00-5.00% of dietary fibers, 1.00-5.00% of casein phosphopeptides, 0.10-0.50% of chicken powder, 0.10-0.50% of beef powder, 0.10-0.50% of carrot powder, 0.10-0.50% of lotus root powder, 0.10-0.50% of Chinese wolfberry powder, 0.10-0.50% of celery powder, 0.10-0.20% of composite vitamins, and 0.50-2.00% of composite minerals. According to the nutritional supplement, the phosphatidylcholine is particularly added, so that the nutritious ingredients are comprehensive; besides, the main ingredients have the effects of complementing and efficiency improvement on the function of auxiliary protection for chemical liver injury, which has an important significance in improving the health conditions of Chinese residents.

The invention discloses a seamless solid core aluminum-calcium core-spun yarn and a production system and method thereof, and belongs to the technical field of core-spun yarns. The core-spun yarn comprises an inner core and a sheath wrapping the surface of the inner core. The sheath is a metal aluminum pipe which is a seamless metal aluminum pipe formed by conducting extrusion punching on an aluminum bar. The production system comprises a dummy ingot extruding head, a heating furnace and a punching extruder. The to-be-machined aluminum bar sequentially passes through the heating furnace and the punching extruder. The heating furnace is used for heating the aluminum bar. The punching extruder is used for conducting punching extrusion on the heated aluminum bar to form the seamless metal aluminum pipe. The to-be-wrapped inner core penetrates into the aluminum bar through the dummy ingot extruding head. By means of the core-spun yarn, the complete, seamless and tight wrapping of the sheath is achieved, the sealing performance is good for the inner core, the oxidation failure of alloy elements in the inner core can be effectively avoided, and the yield of alloy elements of the inner core in molten steel can be increased by 8-10%.

The invention discloses a high-temperature pressure sensor chip based on an MEMS process. The high-temperature pressure sensor chip comprises a chip base, a P-type epitaxial layer, an N-type epitaxiallayer, a pressure-sensitive thin film, a piezoresistive element, a connection support, a piezoresistive element isolation layer, an ohmic contact window, a metal layer and a metal layer protective layer, wherein the obverse side of the chip base bears the piezoresistive element; the pressure-sensitive thin film is formed on the reverse side of the chip base in an etched mode; the piezoresistive element and the connection support are formed on the N-type epitaxial layer in an etched mode; the piezoresistive element isolation layer covers the piezoresistive element and the connection support; the metal layer and the piezoresistive element are connected with each other through the ohmic contact window etched in the piezoresistive element isolation layer; and the connection height between thepiezoresistive element and the metal layer is the thickness of the piezoresistive element isolation layer. The pressure sensor chip not only can work stably in a high-temperature environment but alsoeffectively avoids the problem of oxidation failure of the piezoresistive element and the metal layer, thereby having a broad application prospect.

The invention discloses a capacitive deionization electrode, a preparation method thereof and a capacitive deionization device. According to the electrode, graphite paper serves as a current collector, and an activated carbon material serves as an electrode material; wherein the surface of the positive electrode material is covered with a layer of anion exchange polymer, the surface of the negative electrode material is covered with a layer of cation exchange polymer, and the preparation method comprises the following steps: S1, mixing an activated carbon material with a conductive agent and abinder to obtain electrode slurry, then coating graphite paper with the electrode slurry, and drying to obtain a substrate electrode; S2, defoaming the membrane scraping liquid containing the anion exchange polymer, coating one surface of the activated carbon material of the substrate electrode with the membrane scraping liquid in a scraping manner, forming a membrane, and modifying to obtain a positive electrode; and S3, defoaming the membrane scraping liquid containing the cation exchange polymer, coating one surface of the activated carbon material of the substrate electrode with the membrane scraping liquid in a scraping manner, and performing modification after membrane formation to obtain the negative electrode. The electrode provided by the invention not only can effectively inhibit the occurrence of side reactions and improve the desalination effect, but also has enhanced toughness.

The invention discloses a long-acting repairing eye mask. The eye mask comprises an eye mask base body and essence which are separately packaged, wherein the eye mask base body comprises a left membrane and a right membrane which are symmetrical; each of the left membrane and the right membrane sequentially comprises a skin-friendly layer, a waterproof layer, a heating layer and a breathable layerwhich are attached to each other from inside to outside; pH response particles are loaded on the sides, away from the waterproof layers, of the skin-friendly layers; vitamin C and vitamin E are loaded in the pH response particles; the essence is prepared from the following raw materials: sodium hyaluronate, Europe horse chestnut seed extract, hydrogenated lecithin, acetyl hexapeptide-8, polysorbate-80, citric acid, phenoxyethanol, glycerol, 1, 3-butanediol and water. Vitamin components are loaded on the eye mask base cloth through the pH response particles, release of the vitamin components under pH control is achieved through cooperative use of the vitamin components and the acidic essence, the vitamin components are prevented from being oxidized in the storage process, and therefore theeye mask can be stored for a long time, and the repairing effect is improved.

The invention discloses a production method for a seamless pure calcium core-spun yarn, and belongs to the technical field of alloy core-spun yarn. The production method comprises the steps that after being heated, a metal calcium bar is extruded and formed into a metal calcium wire with the diameter of 8.7-12.9mm through an extruding machine; the extruded metal calcium wire is guided into a vacuum coating processing tank so that the surface of the calcium wire can be uniformly coated with a nano ceramic coating; the calcium wire coated with the nano ceramic coating is guided into a curing processor and is subjected to curing treatment through a hot air device; and after the coating on the surface of the metal calcium wire is cured, the metal calcium wire is guided into a sizing mill to be subjected to sizing treatment through a guide wheel, then the residual coating on the surface of the calcium wire is cut off, and the calcium wire is rewound into the seamless pure-calcium core spun yarn with the diameter of 9-13mm. According to the technical scheme of the production method, the treatment effect of the obtained core-spun yarn on molten steel can be effectively guaranteed, the rejection rate of an obtained core-spun yarn product is low, a production system is simple in structure, the production efficiency is high, the cost is low, and popularization and use can be facilitated.

The invention discloses a LED light source structure. The light source structure comprises a fixing support, a LED chip, a packaging glue and a quantum dot glass box. The fixing support is successively provided with a packaging groove and an installation groove from a bottom portion to a top portion. A width of the installation groove is larger than a width of the packaging groove. The LED chip is packaged into the packaging groove by using the packaging glue. The installation groove possesses a size which matches with a size of the quantum dot glass box. The quantum dot glass box is clamped and placed in the installation groove. The quantum dot glass box comprises a glass box and a quantum dot phosphor powder material. The glass box possesses an accommodation cavity. The quantum dot phosphor powder material is packaged into the accommodation cavity in a solidification mode. The invention also discloses a packaging method of the LED light source structure.

The invention belongs to the technical field of airplane component strength testing, and particularly relates to an airplane component strength testing heating device which comprises: a box body, wherein the box body is provided with an inert gas inlet communicated with the internal space of the box body, an inert gas outlet communicated with the internal space of the box body and a radiation heating window communicated with the internal space of the box body; a graphite heating element which is arranged in the internal space of the box body; and glass which is arranged in the radiation heating window and blocks the radiation heating window, wherein the graphite heating element can radiatively heat the aircraft component through the glass. In addition, the invention relates to an airplane component strength testing heating method implemented based on the airplane component strength testing heating device.

The invention relates to an environment-friendly anti-collapse drilling fluid and a preparation method thereof, and belongs to the field of petroleum drilling fluids. The environment-friendly anti-collapse drilling fluid comprises the following components in parts by weight: 100 parts of water; 2-6 parts by weight of sodium bentonite; 0.5-2 parts by weight of anti-collapse starch; 0.3-0.8 part byweight of high temperature resistant modified starch; 0.5 to 1 part by weight of polyanionic cellulose; 2-5 parts by weight of a humic acid fluid loss agent; 2-5 parts by weight of lignite resin; 0.2to 0.5 part by weight of sodium sulfite; 2-6 parts by weight of calcium carbonate with a particle size of 40-70 microns; and 5-10 parts by weight of calcium carbonate with a particle size of 10-30 microns. The environment-friendly anti-collapse drilling fluid is an environment-friendly anti-collapse drilling fluid system taking environment-friendly anti-collapse modified starch as a main agent; and the provided drilling fluid has a good rheological property and a strong water loss resistant property after being aged at 150 DEG C for 16 hours, can be applied to a high-temperature environment, has a good anti-collapse performance and environmental protection performance, can maximally reduce environmental pollution, and meets the requirements of drilling engineering for safety, high quality,rapidness and high efficiency.

The invention relates to preparation of nanometer materials and specifically discloses a method for large-scale continuous preparation of nanometer zero-valent metal materials. The method includes thefollowing steps that (1) biomass adsorption particles and a metal salt ion solution make contact in a soaking mode according to the solid-to-liquid ratio of 1:1-50 g / ml, and after filtering, separation and washing, water is added for size mixing to form a suspension state according to the solid-to-liquid ratio of 1:1-50 g / ml, and a material A is obtained; (2) a sodium borohydride aqueous solutionwith the concentration being 0.1-1 mol / L is prepared to serve as a material B; and (3) the material A and the material B are added into an auger type spiral mixer in a mixed mode according to the volume-flow rate ratio of 1:1-5, mixing and reinforcing contact are carried out in the auger type spiral mixer, a reduction reaction is completed, residual reagents are removed by rapidly washing outputmaterials, and the nanometer zero-valent metal loaded composite materials are obtained. By means of the method, the technical problems that nanometer zero-valent metal is prone to air oxidation and solid-liquid separation and washing are difficult in large-scale preparation are solved, and a highly engineered technological approach for large-scale preparation of the nanometer zero-valent metal materials is provided.

The invention discloses a preservative fresh keeping agent formula rich in hexalactone ferulate. The preservative fresh keeping agent formula comprises 1-2 parts of hexalactone ferulate, 1-2 parts ofsilver crap scale collagen peptide, 0.5-1 part of a jasmine flower extract, and 4-5 parts of pullulan polysaccharide. The invention further discloses an application of the preservative fresh keeping agent composition formula to medicinal plant raw materials and food processing, particularly an application of the preservative fresh keeping of fresh dendrobium candidum strips. According to the formula and the application thereof, the problems that the fresh dendrobium candidum strips are rotten, change color, dehydrate and the like during storage are effectively solved, the efficacy of the treated fresh dendrobium candidum strips can be maintained for a long time, and the herbal medicine taste of the fresh dendrobium candidum strips can also be effectively reduced. The developed solid freshkeeping agent is convenient to apply and transport, the produced fresh dendrobium candidum strips can be stored for a long time, the nutrient value and the safety are high, and the preservative freshkeeping agent formula meets market requirements.

The invention discloses a silicon carbide ohmic contact electrode and a manufacturing method of the silicon carbide ohmic contact electrode. The manufacturing method includes the steps of providing a SiC wafer material, and cleaning the surface of a SiC wafer; depositing ohmic contact metal Ni on the surface of the SiC wafer; depositing TiW alloy on the ohmic contact metal Ni; conducting high-temperature annealing on ohmic contacts, and completing manufacturing of SiCohmic contact structures. According to the silicon carbide ohmic contact electrode and the manufacturing method, as the TiW alloy has certain oxidation resistance, ohmic contact partial oxidation efficacy losing in the ohmic contact annealing and follow-up technological process can be prevented; the ohmic contacts of TiW / Ni / SiC structures have the better reliability compared with ohmic contacts of Ni / SiC structures.

The invention discloses a lubricant and a preparation method and application thereof, the lubricant is of a core-shell structure, the core is molybdenum disulfide particles, and the shell is silicon dioxide coating the molybdenum disulfide particles. The preparation method of the lubricant comprises the following steps: adding molybdenum disulfide into a strong oxidizing solution, continuously stirring for a certain time, and then washing and drying; adding deionized water into the treated molybdenum disulfide, carrying out ultrasonic dispersion, coarsely preparing a turbid liquid, then mixing the turbid liquid with absolute ethyl alcohol, adding tetraethoxysilane and ammonia water, starting to react at a certain temperature, and reacting for several hours under electromagnetic stirring; and separating the reaction product, washing with absolute ethyl alcohol for multiple times, washing with deionized water for multiple times, and drying in vacuum to obtain the lubricant. The lubricant prepared by the invention can be used as a lubricant for metal material processing such as hot extrusion, and the method has the characteristics of simple process, easily available raw materials, low cost, good lubricating property and the like.

The invention relates to a switch for an automobile brake lamp. The switch comprises a shell, a shell cover, a pushing rod, a positive electrode pin and a negative electrode pin, wherein the shell and the shell cover are correspondingly matched; one end of the positive electrode pin and one end of the negative electrode pin are respectively connected with electrodes; one end of the pushing rod extends out of the pushing rod hole of the shell, and the other end of the pushing rod is a U-shaped end, and two sides in the U-shaped end are respectively provided with a magnetic block; the two ends of the U-shaped rod of the pushing rod are respectively connected with a spring, and the other end of each spring is connected with the inner side of the shell cover; the positive electrode pin and the negative electrode pin are respectively arranged on the shell cover, and the electrode ends of the positive electrode pin and the negative electrode pin are respectively positioned in the shell cover, wherein one pin is of an L shape, thus the contact points of the electrodes of the positive electrode pin and the negative electrode pin are corresponding up and down, contact point ends of the positive electrode pin and the negative electrode pin are respectively positioned in a seal protection body, and the seal protection body is corresponding to the middle part of the U-shaped end of the pushing rod. The contact points of the switch provided by the invention are isolated from atmosphere, contact oxidation invalidity is avoided, and the service life of the switch is prolonged so as to meet the automobile using requirements; and the switch is suitable for various different automobiles.

The invention discloses a carbon steel welding rod and a manufacturing method thereof. The carbon steel welding rod comprises a metal core and a coating. The metal core comprises a work part and a clamping part which are fixedly connected. The outer surface of the work part is coated with the coating, the coating contains 17.0-20.0% of magnetite, 13.0-14.0% of ferromanganese, 12.0-16.0% of starch, 4.0-6.0% of ilmenite, 6.0-8.0% of rutile, 5.0-7.0% of magnesia, 4.0-7.0% of manganese carbonate, 1.0-2.0% of magnesuim-aluminium alloy and the balance microcrystalline cellulose. The work part is made of iron alloy wires, and the clamping part is made of copper-coated aluminum wires. The method includes the step that the work part and the clamping part are coated with the coating after rubbing with each other and being welded. According to the structure of copper-coated aluminum, on one hand, the clamping portion of welding tongs has good conductivity; meanwhile, oxidation failure of the clamping portion is also effectively avoided; moreover, color of a copper-coated layer has remarkable identifiability compared with a welding rod coating and a steel structure.

The invention discloses a nickel plated welding rod and a manufacturing method thereof. The nickel plated welding rod comprises a metal welding core and a covering, wherein the metal welding core comprises a working part and a clamping part which are fixedly connected; the covering is coated on the outer surface of the working part; the working part is an iron alloy wire; the clamping part is a nickel plated aluminum wire; the top of the working part is conical; the vertex angle of the taper is 20-50 degrees; the mass ratio of iron, silicon, manganese and chromium in the iron alloy wire is (4-6):(1-3):(0.5-1.5):(0.3-0.8). According to the method, the covering is coated after the working part and the clamping part are subjected to friction welding. The components of the iron alloy wire are rational, and the quality of a weld joint can be improved; remaining of a discharge electrode on the weld joint is avoided by using different materials.