423results about How to "Highlight significant progress" patented technology

The invention provides a small-sample face recognition method which relates to a method for face recognition by means of electronic equipment. According to the face recognition method, a single-layer multi-scale convolutional neural network structure is used for performing multi-characteristic fusion and classification. The method comprises the steps of preprocessing a face image; extracting a multi-characteristic graph of the face image; extracting a DWT low-frequency subband graph, an Sobel edge characteristic graph and an LBP pattern characteristic graph; performing multi-characteristic fusion by means of the single-layer multi-scale convolutional neural network structure; and predicating a classification result by means of a Softmax classifier, thereby realizing face recognition. The small-sample face recognition method overcomes a defect of low classification recognition rate caused by a classification method in settling a small-sample face recognition problem.

The embodiment of the invention provides a parcel sorting method and a control device. The problems that in the prior art, a parcel sorting method for carrying out parcel distribution through a fixed transmission path is adopted, flexibility is poor, and the sorting efficiency remains to be improved are solved. The method is applied to a parcel sorting system. The parcel sorting system comprises the control device, a detection device and a plurality of moving transporting devices. Outlet positions corresponding to different destinations are preset in the control device. The method comprises the steps that the control device obtains the destinations, detected by the detection device, of parcels to be sorted; at least one moving transporting device is controlled to transport the parcels to be sorted to the outlet positions corresponding to the destinations of the parcels to be sorted, and one parcel to be sorted or a plurality of to-be-sorted parcels with the same destination are loaded on the moving transporting devices. By means of the method, the parcel sorting efficiency and the sorting flexibility can be obviously improved, implementation is convenient, and application and popularization are easy.

The invention provides a security control system and an authentication method of a smart home Internet of Things. The security control system comprises a control terminal, a controlled terminal and a smart home authentication center, wherein the control terminal performs binding and identity authentication with the smart home authentication center through a security chip; the controlled terminal performs binding and identity authentication with the smart home authentication center through a security chip; the smart home authentication center performs device binding and identity authentication between the control terminal and the controlled terminal; and after the binding is accomplished, the control terminal and the controlled terminal perform encryption communication and identity validity authentication. The security control system provided by the invention has the beneficial effects that the security chip can be installed on the control terminal, the controlled terminal and a routing device, a public key digital certificate and a private key are allocated to each device and are stored in the device, it can be ensured that only authorized control terminal can perform remote control on the controlled smart home, and illegal control is effectively prevented.

The invention discloses a low permanent compression deformation thermoplastic polyurethane elastomer, which is characterized in that: a certain amount of short-chain alcohol with the molar mass of 100-600g and the functionality of more than 2 is added into a chain extender; and due to the crosslinking of the short-chain alcohol, the elasticity, strength and permanent compression deformation resistance of a product are improved.

The invention discloses a rail-mounted vertical circulating three-dimensional garage which comprises a body frame, a basket parking unit and a drive chain wheel. The garage is characterized in that the body frame comprises a front frame and a rear frame, the front frame and the rear frame are each provided with a pair of symmetrical chain wheel track grooves in a fastened mode, an idler wheel trolley chain is installed in each chain track groove, the drive chain wheels are symmetrically installed below the front frame and the rear frame respectively and drive the idler wheel trolley chains respectively to move on the vertical face up and down in a circulating mode, the idler wheel trolley chains drive the basket parking unit to move up and down in a circulating mode, and all the components form the rail-mounted vertical circulating three-dimensional garage. The garage has the advantages of being simple and reasonable in structure, safe, reliable, easy to install, convenient to maintain, small in occupied area, large in parking number, and capable of achieving the purpose of increasing parking lots by improving structural strength of the frame and increasing the structural height.

The invention discloses a novel electric propulsion system. The system comprises an internal combustion engine, an electric generator, an electric distribution system, a propulsion motor and a propeller, wherein the electric generator is in cable connection with the propulsion motor through the electric distribution system; the propulsion motor is connected with the propeller through a clutch and a speed reducer; both the electric generator and the propulsion motor are synchronous motors; and the propeller is an adjustable pitch propeller. The novel electric propulsion system effectively solves the problems of high investment cost, electric loss, severe harmonic pollution, difficult maintenance and high failure risk due to the adoption of a variable frequency technique by the electric propulsion system in the prior art and also solves the problems of high voltage drop in a system power grid and big torque born by a starting transient mechanical shaft due to the high starting transient current in the electric propulsion system in the prior art. The novel electric propulsion system has little investment, convenient installation and maintenance, a low running cost, high system reliability, low failure risk in a use process and a remarkable economic benefit.

The invention discloses a method for extracting platinum-palladium out of copper anode mud. The method is characterized in that the platinum-palladium is extracted by employing a secondary gold dust chlorination gold leaching liquid, and the method comprises the following process steps of: firstly, carrying out sulfation roasting on the copper anode mud, carrying out primary chlorination gold leaching, carrying out sulfur dioxide gas reduction so as to obtain a primary reduction liquid, and subsequently carrying out zinc powder replacement so as to enrich gold, silver, platinum and palladium into secondary gold powder; secondly, dissolving the secondary gold powder, removing the impurities, filtering the obtained filtered residue, carrying out secondary chlorination gold leaching, adding ammonium chloride and a reduction inhibitor sodium chlorate into the filtered liquid, and reacting so as to obtain platinum and palladium precipitate; and finally reducing the filtered liquid by using a liquid sulfur dioxide to leach the gold. The method is simple in process equipment arrangement and convenient to operate; the recycling rate of the gold in the copper anode mud is increased; and meanwhile the platinum-palladium is effectively enriched in platinum-palladium concentrate.

The invention discloses a single-component thread locking epoxy precoated adhesive which is characterized by being prepared from the following components in proportion by weight: 40-70 parts of epoxyresin, 10-80 parts of activated thinner, 20-60 parts of epoxy hardener, 8-20 parts of urea, 30-60 parts of formaldehyde solution, 10-30 parts of hydroxyphenol, 0.5-5 parts of stuffing, 5-15 parts of surfactant, 80-200 parts of distilled water, 0.5-2 parts of membrane material, 0.1-1 part of hydrolysis inhibitor and 5-10 parts of solvent; and a preparation method comprises the steps: firstly, respectively microencapsulating the epoxy resin and the epoxy hardener are and then uniformly mixing with other components in proportion. The single-component thread locking epoxy precoated adhesive has the characteristics of convenient construction, applicable workpiece material diversification, less curing condition restriction, good moisture resistance and high destabilizing moment and average disassembly moment, ensures the locking performance and better guarantees the safe reliability of products.

The invention discloses a brewing method of fruit-flavored dry red wine. The brewing method comprises such processing steps as determining a harvest time and harvesting, removing stems, sorting, crushing, extracting juice, cold-steeping, undergoing alcoholic fermentation with peels, separating peels and dregs, undergoing alcoholic fermentation with clear juice, storing, stabilizing, blending, freezing, sterilizing, filling and the like, so that produced dry red wine is intense, elegant and exquisite in fruit flavor, smooth and soft in taste, and is balanced and coordinated in wine body.

The invention discloses a plastic wood board and a preparation method thereof. The plastic wood board is characterized by comprising the following raw materials in portion by weight: 60 to 85 portions of crop fiber, 20 to 40 portions of waste regenerated plastics, 1 to 2 portions of lubricant, 1 to 5 portions of compatilizer, and 1 to 5 portions of stabilizing agent, wherein the lubricant is paraffin, the compatilizer is one of MAPP and MAPE, and the stabilizing agent is general plastic stabilizing agent; and the raw materials are mixed, extruded, granulated, and then added with glass fiber to be pressed into the plastic wood board, and the thickness of the board is 0.5 to 40 millimeters. The plastic wood board combines the plant fiber with the waste plastics together, needs no adhesive, has no discharged pollution, can be fully recycled, has the advantages of wide application, good property, qualified single evaluation of each index, simultaneously lower requirement on equipment and no limited specification, and can be made into various specifications according to requirements of users.

The invention relates to a user description based programming design method on an embedded heterogeneous multi-core processor. The method includes the steps that a user configures a guide through an image interface to perform description of a heterogeneous multi-core processor platform and a task, a parallel mode is set, an element task is established and registered, a task relation graph (directed acyclic graph (DAG)) is generated, the element task is subjected to a static assignment on the heterogeneous multi-core processor, and processor platform characteristics, parallel demands and task assignment are expressed in a configuration file mode (extensible markup language (XML)). Then the element task after a configuration file is subjected to a parallel analysis is embedded into a position of a heterogeneous multi-core framework code task label, a corresponding serial source program is constructed, a serial compiler is invoked, and finally an executable code on the heterogeneous multi-core processor can be generated. By means of the user description based programming design method on the embedded heterogeneous multi-core processor, parallel programming practices such as developing a parallel compiler on a general personal computer (PC) or a high-performance computing platform, establishing a parallel programming language and porting a parallel library are effectively avoided, the difficulty of developing a parallel program on the heterogeneous multi-core processor platform in the embedded field is greatly reduced, the purpose of parallel programming based on the user description and parallelization interactive guide is achieved.

The invention relates to the technical field of lighting of household table lamps, in particular to a novel table lamp with the intelligent light regulating and eyesight protecting functions and a control method for regulating illuminating of the novel table lamp. The novel table lamp comprises a base, a lamp body and a lamp part, the illuminating on a table top can be regulated intelligently, and standard visual illuminating needed for work and study is provided. Meanwhile, the novel lamp table has the automatic turn-on and turn-off function, and is turned off automatically after a user finishes working or studying, the trouble caused by regulating the illuminating of operating the table lamp manually is omitted, the situation that power waste is caused when people forget to turn off the lamp is avoided, and the service life of the table lamp is prolonged. In addition, the novel table lamp has the functions of correcting the sitting posture of the user and urging the user to sleep on time, the problems that the eyesight of the user is affected by an incorrect sitting posture and the eyes are used too much are solved, and the novel table lamp plays a good role in protecting the eyesight of juvenile students. The novel table lamp is reasonable in structure, complete in function, reliable in operation, convenient to use and high in practicability, achieves intelligent control, can meet needs of different users, and plays a remarkable role in protecting the eyesight of juvenile students.

The invention discloses a face microexpression recognition method and relates to a method for recognizing graphs with electronic equipment. The method comprises the steps that after a face microexpression image sequence is preprocessed, the Birnbaum-Saunders distribution curve is used for building a regression model, then the CBP-TOP algorithm is used for extracting dynamic space-time texture features of the face microexpression sequence, and finally a classier is used for training and prediction. The defect that an existing face microexpression recognition method is sensitive to small features such as bright points, edges and white noise of a face microexpression image, thereby being low in recognition performance is overcome.

The invention provides a power lead recovery device, which comprises a base, an electromotor, a speed reducer, a bracket and a take-up reel, wherein the take-up reel comprises two round end plates on two ends of the take-up reel, a plurality of round rods for forming a take-up reel body, and a rotating shaft; the rotating shaft is installed in the middle of the two round end plates; the round rods are flexible round rods; two ends of the round rods are respectively arranged on the two round end plates; the take-up reel is installed on the bracket; the bracket is arranged on the base; the electromotor is fixedly arranged on one end of the base; and the electromotor is connected with the rotating shaft of the take-up reel by the speed reducer. According to the power lead recovery device disclosed by the invention, the take-up reel with a contracting and stretching function is adopted to recover a waste and old lead, the device is more convenient and quicker to store and transport, the working efficiency is greatly improved, and the working intensity of workers is lightened.

The invention provides a method for gas-phase solvent-free catalysis-free synthesis of 3-methyl-3-butenyl-1-alcohol, comprising the following steps: preparing paraformaldehyde (PFA) and isobutene into slurry material at first; then carrying out deploymerization according to technology condition requirements to obtain gas-phase formaldehyde and isobutene; and carrying out a prins reaction under rated conditions, thus greatly reducing energy consumption and pollutants. The purity of the product 3-methyl-3-butenyl-1-alcohol reaches above 94wt%, and the yields of the PFA and the isobutene respectively reaches 97% and 90%.

A method to extract charge elements with drain water and waster slag, It contains the following technology steps: a To acidulate; the cyanide tailings and blended with acid drain water. b To add protection alkali; To enter the agitated tank before floatation, and add protection alkali to neutralize and precipitate the ion of impurity. C To recover by flotation; the beneficiated ore will be produced out after a rude choice, two scavengings, and a choice. d To floatate the smelting end product of beneficiated ore; to produce out end product: vitriol, copper, bullion bar, sycee, and iron ore concentrate, the remained tailings will be sell to produce brick, the arrangement of the technology equipment is simple, and the operation is stable and easy to control, It' s adaptability to the cyanide tailings produced by different technology is very high, It not only eliminates the pollution to environment caused by the pile-up of tailings, but also further accelerates the reclaim of the useful element, and at the same time, it saves a part of cost spend in dealing with the drain water.

The invention discloses a full-automatic current-limiting non-negative pressure pipe network lamination water-supply device, wherein a pipe network is directly connected in series with a water pump to pressurize and supply water, thereby cancelling a middle process of secondary pollution which is caused by exposition and storing of water bodies of water ponds and water tanks and the like. Under the totally-enclosed environment, the condition of producing negative pressure is eliminated, and the device runs under constrained conditions and does not produce negative pressure, which avoids harmful impact to the pipe network. Even if negative is going to be produced, the marginal state to produce negative pressure can be eliminated, and the dual-function of prevention and elimination can guarantee that water flow state in the pipe network changes steadily and smoothly, and the pipe network runs steadily, and qualified running water is directly supplied to each water-consumed spot. The invention has the outstanding advantages of high energy-saving, high reliability, strong application performance, full-automatic control, and environmental protection.

The invention discloses a regional health information sharing network system, which is characterized in that an application terminal device of a community health service center, an application terminal device of a village clinics/service station, an application terminal device of a large and medium-sized hospital, and an application terminal device of a third party pay for medical insurance are all in two-way data connection with a medical health information sharing platform. The system is suitable for establishing cross-platform data sharing in a certain scope mainly based on residents, and builds up a perfect platform for the construction of regional health information. Based on the platform, a plurality of application systems of different fields and different structures can be added, thus the platform has excellent expansibility, and regional health information is shared and interacted. The system has strong data integration performance; a BG-MPI module provides a strong data pairing mechanism with high accuracy; and mutual authentication of multiple service modules can be realized. Compared with the prior art, the system has outstanding substantive characteristics and remarkable improvement.

The invention provides a high-strength steel plate with tensile strength of 800 MPa above and a manufacturing method thereof. The steel plate produced by the manufacturing method comprises the following components in percentage by weight: 0.08-0.21% of carbon, 0.15-0.45% of silicon, 0.70-1.10% of manganese, at most 0.015% of phosphorus, at most 0.010% of sulfur, 0.40-0.65% of chromium, 0.10-0.25% of molybdenum, 0.030-0.080% of vanadium, 0.010-0.030% of titanium, 0.020-0.050% of aluminum, 0.0005-0.005% of boron, and the balance of iron and inevitable impurities. The tensile strength of the steel plate reaches higher than 800 MPa, the -20 DEG C transverse impact work is not less than 34J, the percentage reduction in area is not less than 45%, and the lateral swelling amount is not less than 0.38 mm; and the invention has the advantages of low cost and favorable welding performance.

The invention relates to the field of airbrushing equipment used for airbrushing the surface of a stereoscopic object and provides an airbrushing method and an airbrushing head which are used for airbrushing the surface of a special-shaped stereoscopic object and are high in airbrushing efficiency in order to overcome the defects in the prior art. The airbrushing head structurally comprises at least two sets of airbrushing head modules, airbrushing holes are distributed in each set of airbrushing head module in a matrix mode, and a certain angle exists between the airbrushing head modules. According to the method, the angle between the airbrushing modules is controlled to change so that the distance between any working airbrushing hole in the airbrushing head modules and airbrushing points on a printing medium is 1-15mm. The distance between the airbrushing holes and the concave-convex surface of the printing medium is kept in a reasonable range, and it is ensured that an airbrushed picture is not deformed.

The present invention discloses process and apparatus for producing bottle cap with pull ring and tear-off. The production process includes the following steps: printing on wide sheet; feeding to a numerically controlled punch with one numerically feeder, punching hole and forming; hemming and bending ears in a turntable ring squeezer to form the cap with pull ring and tear-off; conveying in a conveying belt to a glue dripping machine and dripping glue; and conveying in a conveying belt to drying apparatus and drying to obtain the product. The semi-automatic production process has high safety, high production efficiency, high material utilizing rate and saving in labor.

The invention relates to a preparation method of a polymer nanofiber membrane containing perfluorinated sulfonic acid. The method comprises four steps: (1) preparing an organic solution containing perfluorinated sulfonic acid and dispersed polymers, by using N, N-dimethylformamide, N, N-dimethylacetamide or dimethyl sulfoxide as a solvent; (2) adding organic small molecular alcohol or an inorganic nanoparticle additive into the above organic solution to prepare an organic blend solution containing perfluorinated sulfonic acid or an organic-inorganic suspended system; (3) preparing a polymer or polymer inorganic nanofiber membrane containing perfluorinated sulfonic acid; and (4) subjecting the obtained nanofiber membrane to acid and alkali treatment to obtain a porous nanofiber membrane with rough surface. The invention has the characteristics of mature and simple preparation process; and the obtained perfluorinated sulfonic acid nanofiber membrane has uniform and controllable distribution of size, high specific surface area, high porosity, good mechanical properties, and overcomes the defects of a traditional perfluorinated sulfonic acid membrane, such as easy swelling in a wet state and easy brittle cracking in a dry state.

The invention provides an intelligent alcohol detector. The intelligent alcohol detector comprises a microprocessor module, a data communication module, a vehicle information identification module, a power module, as well as an alcohol detection module and a display module which are respectively connected with the microprocessor module, wherein, the microprocessor module is connected with the data communication module so as to communicate with a vehicle information database, and the microprocessor module is connected with the vehicle information identification module so as to identify an electronic driving license, an electronic license plate and/or an electronic frame; and the vehicle information identification module is an RFID (radio frequency identification) module. The intelligent alcohol detector has the advantages that on the basis of modular design idea, the functions for identifying the electronic driving license, the electronic license plate and the electronic frame are integrated with the alcohol detection function so as to simplify the traditional mode of manually inputting vehicle information by law enforcement official, thus greatly improving the law enforcement efficiency.

The invention relates to the technical field of liquor production and provides a manufacturing method of cane wine, comprising the following steps: (1) preparing normal juice of cane; (2) culturing seed liquid A and seed liquid B of yeast; (3) preparing cane stalk trichosporon brassicae A and cane stalk trichosporon brassicae B; (4) fermenting: obtaining mature fermentation after the normal juice of cane is fermented in a two-step manner by trichosporon brassicae A and trichosporon brassicae B; (5) obtaining the cane wine by the way that the mature fermentation obtained in step (4) is decompressed and doubly distilled. The invention utilizes cane stalk as yeast wine carrier and normal juice of cane as raw material and adopts a reduced pressure distillation process, uses no cereals and other organic or inorganic nutrients, so that the white wine is entirely brewed by normal juice of cane. The brewed white wine reserves the unique aroma substance of cane, thus boasting rich cane flavour. The invention has far-reaching significance in saving cereals, improving the utility value of cane and promoting the development of agriculture of China.

The invention relates to a water-borne architectural color coating with a light reflection function. The water-borne architectural color coating is characterized by comprising the following components: elastic acrylic latex, rutile titanium dioxide, crystal form infrared reflection titanium dioxide, white carbon black, a hollow microsphere emulsion, mica powder, kaolin, talc, calcium carbonate, a dispersing agent, a wetting agent, an antifoaming agent, an anticorrosive agent, a mould inhibitor, a pH regulator, a coalescing agent, an antifreezing agent, a thickener, a leveling agent, an organic pigment and an inorganic pigment, wherein the hollow microsphere emulsion adopts a modified acrylate organic polymer as the sphere wall and is hollow inside. The water-borne architectural color coating with the light reflection function is used for coating an external wall of a building, can effectively reduce the surface temperature of the building so as to save air conditioning energy consumption, and can be used in areas with hot summer; a product can meet the requirement of customers for different colors, the energy-saving effect is obvious, energy saving and attractiveness are realized, and the water-borne architectural color coating has outstanding essence characteristics and significant progress compared with the coating only adopting white color or other light colors in the prior art.

The invention discloses a high-reliability fast curing underfill adhesive, which is characterized by comprising the following raw materials by weight portion: 45 to 75 portions of resin, 20 to 25 portions of specially processed silicon powder, 0.5 portion of colorant, 20 to 25 portions of curing agent, 1 to 6 portions of curing accelerant, 0.1 to 3 portions of coupler, 10 to 15 portions of cycloaliphatic epoxy resin and 15 to 25 portions of epoxy active diluents. The preparation method of the high-reliability fast curing underfill adhesive comprises the following process steps: a, pretreatment, in which the resin is roasted for one night at 70 to 75 DEG C; and b, mixing, in which the resin, the cycloaliphatic epoxy resin and the coolant are first uniformly mixed and then added with by three times the specially processed silicon powder followed by the curing agent and the curing accelerant, the uniformly mixed materials are added into a reaction kettle, the reaction kettle is completely vacuumized for 15 minutes, the coupler and the epoxy active diluents are added after the resin and the curing agent are mixed uniformly, the reaction kettle is completely vacuumized for 30 minutes, and the product is obtained. The product has the advantages of low curing temperature, high curing speed, high flowing speed, excellent storage stability, simple, easy and environmentally-friendly preparation process, low cost and wide application range.

The invention discloses three-functionality-degree organosilicon polyurethane acrylate and a synthetic method thereof. The invention is characterized in that an epoxy radical silane coupling agent is used for modifying a primary amino radical parhelium radical silane coupling agent to obtain a modified silane coupling agent containing three functional groups with active hydrogen; vulcabond and polymer dihydric alcohol are used for carrying out a reaction to obtain a polyurethane performed polymer (1) with NCO radical groups on both ends; then, hydroxy acrylic acid ester and the polyurethane performed polymer (1) are used for carrying out a reaction to obtain a polyurethane performed polymer (2) with an NCO radical group on one end; and finally, the polyurethane performed polymer (2) and the modified silane coupling agent react to obtain the three-functionality-degree organosilicon polyurethane acrylate. The invention has simple technology of the synthetic process and easy control, a product has regular structure, narrower molecular weight distribution and good consistency, the materials have the excellent properties of humidity resistance, heat resistance, weather resistance, oil resistance, good flexibility and low surface energy, and the invention can be applied to the industries of paint and adhesives.

The invention discloses a sustained-release granule for controlling storage diseases and insect pests. The sustained-release granule comprises a granular inert carrier. Effective components are adsorbed on the granular inert carrier and comprise allyl isothiocyanate, glutaraldehyde and a stabilizing agent. A film-coating agent coats the surface of the granular inert carrier; the weight percentageof the granular inert carrier is 55-96.9 percent; the weight percentage of the allyl isothiocyanate is 1-20 percent; the weight percentage of the glutaraldehyde is 1-10 percent; the weight percentageof the stabilizing agent is 0.1-5 percent; and the weight percentage of the film-coating agent is 1-10 percent. The invention aims to provide the sustained-release granule for controlling the storagediseases and insect pests and a preparation method thereof, wherein the sustained-release granule has favorable controlling effect for main storage insect pests and germs, can control the diseases and insect pests with long action, reduce the drug-applied times and the drug-applied cost, is safe and economic in various links of production, transportation, storage, application and the like, saves labor power and physical resources, cannot damage the environment and is green and safe.

The invention discloses a colored reflection heat insulation coating, comprising acrylic acid emulsion, titanium dioxide, infrared reflection pigment, calcium carbonate powder, powdered steatile, kaolin powder, dispersant, wetting agent, antifoaming agent, thickening agent, film forming auxiliary agent, and antiseptic. The heat insulation principle of the reflection heat insulation coating is high reflectivity, thus the heat of solar radiation can be effectively reduced. According to the invention, the colored reflection heat insulation coating disclosed herein is used for coating the exterior walls of buildings, can reduce the surface temperature of the buildings by 10-20 DEG C, thus the energy consumption of air conditioning is saved; the colored reflection heat insulation coating can be used in hot-in-summer and warm-in-winter area hot-in-summer and cold-in-winter area and the like, thus the effects of heat preservation and heat insulation are achieved; the colored reflection heat insulation coating has excellent energy saving effect; and compared with the prior art, the colored reflection heat insulation coating has remarkable substantial characteristics and significant progress.

The invention discloses a slow-closed rotary-opened type check valve capable of preventing waterproof hammer. The slow-closed rotary-opened type check valve is characterized in that an umbrella-shaped slow-closed device is further arranged between the back of a valve clack and a support. The umbrella-shaped slow-closed device comprises an elastic buffering device, an inner umbrella and an outer umbrella, wherein the inner umbrella and the outer umbrella are of disk-shaped structures, an overflowing hole is formed in the outer umbrella, an outer umbrella inner spherical face is arranged on the outer umbrella, the outer umbrella is fixedly arranged on a valve clack shaft, an inner umbrella outer spherical face and an inner umbrella inner spherical face are arranged on the inner umbrella, a guiding hole is formed in the inner umbrella, the guiding hole and the valve clack shaft are in axial movable fit, one end of the elastic buffering device is connected with the back of the valve clack, the other end of the elastic buffering device is connected with the inner umbrella inner spherical face, and the outer umbrella inner spherical face is tightly pressed by the inner umbrella outer spherical face. When the medium pressure on the inlet side of the valve is closed suddenly, the valve clack is slowly closed in a rotary mode. A sealing face is prevented from being damaged, water hammer is prevented from being generated, and the service life is long.