33results about How to "Quarantine entry" patented technology

The invention provides Sn-Zn-Bi-series lead-free welding flux alloy and a preparation method thereof. The Sn-Zn-Bi-series lead-free welding flux alloy consists of the following elements in percentage by mass: 6-8% of Zn, 1-3% of Bi, 0.2-1% of Ti, 0.02-0.1% of Al, 0.001-0.005% of B and the balance Sn. Compared with the prior art, the Sn-Zn-Bi-series lead-free welding flux alloy has relatively good welding spot bonding strength and also has relatively good resistance to oxidation and wettability.

The present invention discloses a water curtain projection platform. The water curtain projection platform comprises a box body, the box body is internally provided with a water curtain generation module, the middle portion of the box body is provided with a projection module, the projection module is installed at the middle portion of the water curtain generation module, the projection module comprises a support plate, the support plate is provided with a four-prism, a projector projecting downwards is installed above the four-prism, a water-proof cover is installed between the four-prism andthe projector, and a projected image is projected to the water curtain generation module through reflection of the four-prism. Through arrangement of the four-prism, one projector is only used to achieve a holographic image effect to reduce the device manufacturing input and facilitate popularization, a lifting rotation module can drive the projection module to perform motion such as rotation andmovement up and down to allow audiences to obtain more visual experience, a flexible water-proof cover is arranged to effectively isolate water from entering a motor so as to ensure the normal usageof the drive motor.

The invention discloses a salt-fog-resistant phosphate modified acrylic waterborne antirust coating for a building scaffold. The salt-fog-resistant phosphate modified acrylic waterborne antirust coating is prepared from the following raw materials in parts by weight: 35-60 parts of salt-fog-resistant phosphate modified acrylic core-shell emulsion, 2-8 parts of cosolvent, 10-15 parts of cobalt naphthenate, 10-15 parts of lead chromate, 5-10 parts of iron laterite, 2-5 parts of strontium chromate, 1-3 parts of rosin, 2-9 parts of ammonium metaborate, 0.5-0.9 part of chlorinated paraffin, 0.3-0.6part of cellulose acetate, 0.2-1.2 parts of dibutyl phthalate, 0.2-1.5 parts of substrate modifier, 0.5-6 parts of auxiliaries and 12-35 parts of deionized water. According to the antirust coating disclosed by the invention, the adhesive force and compactness between a film and a substrate are enhanced, so that water molecules, chloride ions and sodium ions are effectively isolated from enteringbetween substrates, the adhesive force, water resistance and anti-flash rusting property of the film are improved in a wet environment, and the salt-fog-resistant phosphate modified acrylic waterborneantirust coating has good adhesive force, water resistance, salt fog resistance, anti-flash rusting property, acid and alkali resistance and corrosion resistance.

The invention discloses a preparation method of soldering paste for an automobile control panel and homogenizing equipment of the preparation method. The soldering paste is prepared from tin powder and paste flux in a mass ratio of 85: 15, wherein the tin powder comprises the following components of bismuth alloy solder powder, Sn-Ag-Cu series solder powder, nano titanium particles and graphene, the flux paste comprises the following components of disproportionated rosin, a surfactant, an organic solvent, organic resin powder, zinc chloride powder and an anti-aging agent, and the homogenizing equipment comprises a tank body, a stirring mechanism and a spraying mechanism. According to the method, graphene in a proper proportion is added, and the graphene interacts with solid solution titanium crystals, so that solid solution titanium preferentially reacts with oxygen, a thin and compact oxidation film is instantly formed on the surface of the molten solder, the oxidation film can effectively prevent external oxygen from entering the film, copper in the molten solder can be inhibited from being oxidized, and the oxidation resistance of the solder alloy is remarkably improved.

The invention relates to solder paste special for welding an SMD diode. The solder paste is prepared from, by weight, 10-20 parts of tin-bismuth alloy solder powder, 60-80 parts of Sn-Ag-Cu series solder powder, 2-4 parts of nano titanium particles, 4-6 parts of graphene, 6-10 parts of phenolic alcohol resin, 1-3 parts of malonic acid, 0.5-1.5 parts of lactic acid, 0.5-1.5 parts of benzoic acid, 6-12 parts of n-butyl lactate, 5-15 parts of ethylene glycol, 1.5-2.5 parts of polyoxyethylene ether and 1-3 parts of nitromethane. The solder paste special for welding the SMD diode has the advantagesthat through the components and the proper proportion of the solder paste, the welding quality can be effectively ensured through the solder paste, and thus the solder paste can be applied to electronic devices effectively.

The invention discloses a vegetable greenhouse with ventilation and buffer functions. The vegetable greenhouse comprises a greenhouse back wall, a greenhouse framework and greenhouse thin film, the greenhouse framework comprises a greenhouse front arc frame and a greenhouse back arc frame, and a ventilation bracket is fixed to the upper end of a greenhouse back wall; the outer side of the ventilation bracket is sleeved with a wind shielding quit, the outer side of the greenhouse front arc frame is fixedly covered with the greenhouse thin film, and the outer side of the greenhouse back arc frame is sleeved with a ventilation quit. According to the vegetable greenhouse, a ventilation structure in a bonnet shape is arranged, cold and warm air go in and go out of the ventilation structure in abuffer manner during the process of letting in fresh air by utilizing the ventilation structure, during the process of letting in the fresh air, the cold air entering into the ventilation structure is firstly mixed with the warm air discharged from the ventilation structure in the ventilation structure, and after the cold air is heated, the heated cold air enters inside the greenhouse, thereby effectively solving the problems that letting in the fresh air causes growth and nutrition problems of the vegetable located at the draught positions.

The invention relates to the field of welding, in particular to a welding wire impurity-removal mechanism for welding. The welding wire impurity-removal mechanism for welding comprises a welding gun gun-head, a welding wire, a welding gun impurity-removal cabin and a welding wire reshaping impurity-removal part, wherein an impurity-removal cabin front supporting rod and an impurity-removal cabin rear supporting rod are separately arranged at the two sides inside the welding gun impurity-removal cabin; the inner structure of the welding wire reshaping impurity-removal part is symmetrical vertically; charge holes are formed in the middle parts of two ends of the welding wire reshaping impurity-removal part; a rotary rod is fixedly mounted above the welding wire reshaping impurity-removal part; and a fan part is arranged at the upper end of the welding wire reshaping impurity-removal part. Threads at the tail end of the rotary shaft are fixedly equipped with limiting screws which can limit fan blades, so that dropping during high-speed rotation is prevented; and a filter screen which is a nylon wire screen is arranged at the right end of the fan bracket, so that dust in air can be effectively prevented from entering; and impurities on the surface of the front roller and the surface of the rear roller can be discharged through suction force of a fan.

The invention relates to an explosion-proof three-phase asynchronous outer rotor motor. The motor comprises a motor stator and a stator coil which are arranged on a main shaft. An outgoing line is connected to the stator coil. A bearing is arranged in the main shaft. A motor rotor is arranged on the main shaft in a rotating way by the bearing. A fastening bolt is screwed on the end part of the main shaft. A sealing cap is arranged on the fastening bolt. An end cover is fixedly arranged on the main shaft by the fastening bolt. A connecting sleeve is fixedly arranged on the end cover. The outgoing line is inserted into the connecting sleeve. An explosion-proof filler is filled between the outer wall of the outgoing line and the inner wall of the connecting sleeve. The outgoing part of the motor is provided with the connecting sleeve and epoxy resin is filled in a gap after the outgoing line is inserted to effectively isolate explosive gases; and certain assembly precision and certain axial jointing lengths are adopted for all jointing surfaces to effectively achieve an isolation effect.

The invention relates to a preparation method of a soldering paste special for patch diode welding. The soldering paste comprises the following components of, by weight, 10-20 parts of tin-bismuth alloy solder powder, 60-80 parts of Sn-Ag-Cu series solder powder, 2-4 parts of nano titanium particles, 4-6 parts of graphene, 6-10 parts of phenolic resin, 1-3 parts of malonic acid, 0.5-1.5 parts of lactic acid, 0.5-1.5 parts of benzoic acid, 6 to 12 parts of n-butyl lactate, 5-15 parts of ethylene glycol, 1.5-2.5 parts of alcohol-polyoxyethylene ether and 1-3 parts of nitromethane. The preparation method of the soldering paste special for patch diode welding has the advantages that by means of the components of the method and the appropriate proportion, the soldering paste can effectively guarantee the welding quality and then can be effectively applied to electronic components.

The invention provides a ventilation device for an outdoor switch. The ventilation device comprises a shell which is divided into an upper shell, a middle shell and a lower shell. The middle shell is provided with grooves at two sides. The middle part of the upper shell is provided with a connection hole. The upper shell is provided with vertical columns at two sides of the upper shell. A ventilation cavity is divided into a U-shaped upper cavity and a lower cavity. The ventilation cavity is a maze type sealed structure. The end part of the lower shell is provided with an air inlet, and a filtering layer is arranged between the air inlet and the lower cavity. According to the ventilation device, the maze type sealed structure is employed, the exchange of hot and cold air between switch equipment and an environment can be realized, the temperature difference between the internal part of a switch equipment cabinet and the environment is eliminated, the metal material corrosion and insulation intensity decrease caused by condensation possibly caused by the temperature sudden change in the switch equipment are avoided, a filter layer is arranged between an inlet and the lower cavity, the water molecules in the air can be effectively filtered, and the operation safety of the switch equipment is protected.

A particle removing device comprises a separator and a collecting device which are arranged in a steam pipeline, and the separator is connected with the collecting device. A discharging pipe is arranged on the collecting device, a valve is arranged on the discharging pipe, and the discharging pipe is located outside the steam pipeline. According to the particle removing device, solid particles in steam can be prevented from scouring a valve pipeline and turbine blades and causing abrasion, the solid particles in the steam can be prevented from causing jamming of a turbine adjusting valve and the like, and it is guaranteed that the turbine adjusting valve and the like can be normally closed when needed so as to effectively cut off steam entering a turbine, prevent the overspeed of a unit and ensure the safety of the unit.

The invention provides a tin-zinc lead-free solder and a preparation method thereof. The tin-zinc lead-free solder comprises, by weight, 5%-10% of zinc, 0.1%-0.2% of nickel, 0.6%-2.4% of graphene and the balance tin. The preparation method comprises the steps that (1) a pure zinc ingot, a pure nickel ingot and a pure tin ingot are sealed in a vacuum quartz tube, and then the vacuum quartz tube is filled with high-purity nitrogen protective gas; (2) the raw materials sealed in the step (1) are put into a reaction furnace to be subjected to smelting heat treatment, and the raw materials are completely melted into molten liquid; (3) the graphene is placed in a stirring type ball mill, the stirring type ball mill is filled with liquid nitrogen till a milling ball is completely submerged, then ball milling is conducted, powder obtained through ball milling is taken out and added into the molten liquid in the step (2), and stirring and heat preservation treatment are conducted; and (4) after the graphene in the step (3) and the molten liquid are uniformly smelted, slagging off is conduced, the molten raw materials are subjected to casting forming, and thus the tin-zinc lead-free solder is obtained. The tin-zinc lead-free solder has good welding spot bonding strength and meanwhile can have good oxidation resistance.

The present invention provides a copper aluminum conducting wire connection structure of high safety. The copper aluminum conducting wire connection structure comprises a sleeve, a copper conducting wire, an aluminum conducting wire and a plurality of screws, the sleeve comprises a plastic inner layer and a metal outer layer, and a plurality of threaded holes are arranged at intervals on the metal outer layer and along the axial direction of the sleeve. The bare conductive core wires of the copper conducting wire and the aluminum conducting wire are placed in a fixed inner cavity of the sleeve from the two ends respectively, are interlaced parallelly and are inserted mutually, so that the circumferential surfaces of the bare conductive core wires of the copper conducting wire and the aluminum conducting wire are contacted and connected mutually and electrically. The plurality of screws penetrate the plurality of threaded holes respectively to press against the plastic inner layer to thereby lock and fix the bare conductive core wires of the copper conducting wire and the aluminum conducting wire in the fixed inner cavity. According to the present invention, the bare conductive core wires of the copper conducting wire and the aluminum conducting wire adopt an interlaced connection mode, so that the connection resistance is not generated, and the electric energy can be saved. The sleeve of the present invention is composed of the plastic inner layer and the metal outer layer, and the plastic inner layer can play an insulation part, protects the oxidation of a copper aluminum core wire, at the same time, also can realize a waterproof effect.

The invention discloses tin soldering paste for a tin soaking machine. According to the weight percentage, the tin soldering paste for the tin soaking machine is made by mixing 85%-90% of lead-free solder alloy powder and 10%-15% of paste flux; the lead-free solder alloy powder comprises, by weight percentage, 5%-10% of zinc, 0.1%-0.2% of nickel, 0.4%-0.7% of copper, 2%-3.5% of bismuth, 0.8%-2.1%of graphene and the balance tin; and components of the paste flux comprise 35wt%-45wt% of an adhering film-forming agent, 0.5wt%-2wt% of modified rosin, 1%-2 % of castor oil diacyl antioxidant, 3%-6%of fluoroborate and the balance an organic solvent. The tin soldering paste is proper in viscosity and high in thixotropy, layering is not prone to occurrence during dispensing of a glue dispenser, and the tin soldering paste can be uniformly coated in an assigned welding area; oxidization of Zn in fused solder can be inhibited, and the anti-oxidizing performance of a solder alloy is remarkably improved; and the copper consumption phenomenon is sufficiently prevented.

The invention discloses a high-rise building fireproof type ventilating window. The high-rise building fireproof type ventilating window comprises a frame, fireproof glass is fixedly installed in the frame, a rectangular opening is formed in the fireproof glass, a ventilating board is fixedly installed in the rectangular opening, and fireproof devices are fixedly installed on the upper parts of the side walls of the two sides of the frame. The fireproof devices comprise strip-type blocks fixedly connected with the frame side wall, dry powder boxes are slidably connected into straight grooves formed in the bottoms of the strip-type blocks in a clamping mode, the dry powder boxes are filled with dry powder, plastic boards are arranged at the bottoms of the dry powder boxes, when a flame spreads upwards, the plastic boards at the bottoms of the dry powder box of the fireproof devices are melted away, at the moment, the dry powder filled in the dry powder boxes fall downwards under the action of gravity to realize fire fighting work on the flame, greater property loss is prevented from being caused due to a fire behavior spreading inside a house through a window, or the situation that the personal safety of residents is affected is avoided; meanwhile, the fireproof devices are arranged on the two sides of the frame inside the house and outside the house synchronously, and the situation that when the house is on a fire, the fire behavior spreads out of the window from the window, and the residents on the upper layer are burnt is avoided.