1240results about How to "Guaranteed unobstructed" patented technology

The invention discloses a message push method, an outgoing server using the message push method and an outgoing server system formed by a plurality of outgoing servers. The message push method includes the steps that all generated or updated messages in a message server are collected; the messages are inserted into a message queue; each message is sent to a corresponding message processing thread; the message processing threads process the corresponding messages to generate messages in a push format, and the messages in the push format are pushed in an asynchronous message processing mode; the message processing threads detect whether the messages in the push format are successfully pushed or not, and if not, the messages failing to be sent are inserted into an abnormal message queue; all the messages, in the push format, in the abnormal message queue are sent in an asynchronous message processing mode. By means of the message push method, blockage of a system and loss of the pushed messages can be avoided, and reliability can be improved through the master-slave structure of the outgoing servers.

The invention provides a network human face recognition system with an intelligent management system, the system comprises a system management module and a plurality of recognition modules which are respectively in network connection with the system management module, wherein the system management module comprises a network data server and a management terminal which is in circuit connection withthe network data server; and the recognition modules comprise recognition control terminals and a plurality of electric control door locks, a plurality of acquisition modules and clients which are respectively in circuit connection with the recognition control terminals; and the clients comprise the functions of access control, attendance management and intelligent monitoring. The system management module can be connected with the plurality of the recognition modules and simultaneously control the plurality of the electric control door locks and the acquisition modules, thereby improving the scalability; the clients are arranged in the recognition modules, thereby proving more functional modules and improving the scalability of the system; and the recognition control terminals adopt the heartbeat mechanism, thereby realizing the periodic synchronous information interaction between the system management module and the recognition modules and ensuring the stability of the operation of the system.

The invention relates to a pine needle tea beverage. According to the technical scheme, the pine needle tea beverage comprises the following substances in parts by weight: 300-700 parts of pine needle, 70-120 parts of fructus crataegi, 10-60 parts of indian buead, 20-50 parts of mulberry leaf, 70-120 parts of red beans, 50-120 parts of Chinese yam and 5-50 parts of dandelion. The invention aims to provide a pine needle tea beverage which has a good effect.

The invention discloses a method for steel-box beam erection applied in self-anchored suspension bridge. Procedures comprise that (1) the support for steel-box beam is set on bank or in no-navigation area and steel-box beam is preassembled with dividing segments on the support for steel-box beam; (2) temporary piers for steel-box beam, which satisfy waterway grade, are set in the waterway suspended by the suspension bridge; (3)preassembled steel-box beam is pushed forwards by pushing or dragging method so that the steel-box beam moves to temporary piers for steel-box beam from the support for steel-box beam and the steel-box beam is supported by temporary piers; then the steel-box beam is preassembled in dividing segments and it is pushed or dragged continuously so that preassembled steel-box beam moves forwards and it passes through temporary piers for steel-box beam on waterway in turn to achieve the opposite bank. The invention is provided with simple construction and it can be applied in waterway with busy suspension and higher waterway grade.

The invention discloses a continuous feeding device for an electric arc furnace preheated by flue gases. The device comprises a double-duct conveying trough and a flue gas guiding hood; a carrier plate with a flue gas channel is arranged in the middle part of the double-duct conveying trough; a material circulating duct is arranged above the carrier plate, and a flue gas circulating duct is arranged below the carrier plate; a seal gate matched with the upper opening of the lower end of the material circulating duct is arranged on the flue gas guiding hood; the double-duct conveying trough forms a flue gas diffusion heat exchanging mechanism from bottom to top, contact area between materials and high temperature flue gas is enlarged, the stay time of the flue gas is long, and the material preheating effect is greatly improved; as the double-duct conveying trough is arranged in an inclined way, the feeding point is raised, the trough bevel is large, the waste steel material blanking point can easily close to the center high temperature area of the furnace, so that the cold area phenomenon is eliminated; as the diffusion and heat exchange designs are realized, the powder dust in the exhausted flue gases is greatly reduced, the flue gas flowing is more in line with the natural rules, and the problems of exhaust pipe blockage and the like are solved.

The present invention discloses a multi-stage pulse synergistic perforating system for oil-gas well. Said system is characterized by that on the basis of adopting detonator for resisting sand impact and synergistic perforating gun said invention utilizes synergistic gun tail, connecting component and threaded connecting component to make second-stage synergistic gunpowder with higher combustion velocity and third-stage synergistic gunpowder with lower combustion velocity be added into the construction pipe string, and the adopted partition board time-delay fire lighter can light the next-stage synergistic gunpowder after a period of time after the last-stage perforating gun is perforated so as to form several gunpowder pressure pulses to fracture formation and make the fracture be continuously extended. Besides, the proppants in two synergistic gunpowders can be fed into the formation fracture together with high-temperature high-pressure gas so as to prevent the formation fracture from being closed.

The invention relates to a ship monitoring method. The monitoring method comprises a target identification method and a target tracking method, wherein in the target identification method, after an intercepted real-time video image and a background image are subjected to differential operation and binarization, a ship target is obtained by using a region growing algorithm, and the identified ship target is tracked and locked. By matching the target identification method, the target tracking method, a target locking method and a pairing comparison and database management method, a monitoring system can capture a ship and acquire continuous ship video under the condition of fog or night so as to realize all-weather monitoring of a shipping lane, ensure smoothness of the shipping lane and safety of the ship, reduce manual operation and realize automatic management; and the data information and the like acquired by monitoring are stored into a database, so that the data information and the like are convenient for digital management of the ship, can be timely called as required and can assist managers in learning more information about the ship.

The invention discloses a composition used for removing food retention and relaxing the bowels of the children, as well as a preparation method thereof. The composition used for removing food retention and relaxing the bowels of the children is designed for specific population of children, excluding the infants. The composition used for removing food retention and relaxing the bowels of the children is prepared from the following raw materials in percentage by weight: 10-50% of fruit and vegetable powder, 10-40% of prebiotics, 0.5-2.0% of active probiotic powder, 5-30% of dietary fiber, and 5-20% of a medicine-and-food homologous food extract. The dosage of the composition is preferably solid beverage or tablet candies. The preparation method of the composition used for removing food retention and relaxing the bowels of the children comprises the following steps: preparing raw materials, carrying out uniform mixing, and carrying out packaging; or the preparation method comprises the following steps: preparing raw materials, preparing a soft material, carrying out granulation, carrying out drying, carrying out grinding, adding the active probiotic powder, adding a flow aid and a lubricant, and carrying out tableting. The composition strictly complies with the principles of traditional Chinese medicines and western medicines, as well as the principles of safety, scientific properties and obvious functions; the raw materials are all selected from the catalog of medicine-and-food homologous, the catalog of new-resource foods and the catalog of common foods; and the selected raw materials are rationally matched in consideration of the taste.

The invention relates to a dustproof electric cabinet. The dustproof electric cabinet comprises a shell. Heat dissipation windows are formed in the sidewalls of the shell, and vertical dust screens are arranged in the shell and closely to the sidewalls. A water collecting hopper is arranged at the top of the shell, and the upper edges of the dust screens extend out of the top of the shell and are communicated with the bottom of the water collecting hopper. Dust discharge grooves are arranged at the bottom of the shell, and the lower edges of the dust screens extend out of the dust discharge grooves. Vertical driving shafts are arranged in the shell, the upper ends of the driving shafts penetrate through the top of the shell, and driving fans are fixedly mounted at the upper ends of the driving shafts. Friction plates are mounted on the side circumferential walls of the driving shafts, and the ends of the friction plates are in contact with the dust screens. The dustproof electric cabinet is capable of preventing dust efficiently on the premise of guaranteeing ventilation and heat dissipation, so that cleanliness and safety can be improved effectively and interior electric elements can be better protected.

The invention relates to a comprehensive verification system and method for identities and documentary evidences, and belongs to comprehensive credential verification systems and methods. According to the comprehensive verification system, a verification system website is established, and the verification system website serves as a verification center; the verification system website is connected with a terminal of the verification system website through a network to form a verification network system. Individual registration information and unit registration information are included in the verification system website, and are the bottom layer basic information of the verification system website. According to the method, a registration method and a verification method are included, unique verification email addresses are automatically generated by using identity numbers and organizing institution codes and serve as verification bases, and simple, convenient and reliable verification is achieved. Wrong identity cards, repeat identity cards and fake identity cards can be conveniently and fast found and screened, and the problem of train ticket wiped by ticket touts can be solved; fake official seals and credentials can be identified; the problem of social insurance and birth certificate verification can be solved.

The invention discloses a silica gel absorption column extraction kit and method for free DNA (Deoxyribonucleic Acid) and RNA (Ribonucleic Acid) of blood plasma or blood serum and relates to the fieldof molecular biology. The kit comprises proteinase K, isopropyl alcohol, absolute ethyl alcohol and threefold-distilled water, and further comprises a lysis solution containing a nucleic acid separation accelerant, an adsorption solution containing a nucleic acid adsorption accelerant and a washing solution; the method is mainly carried out by utilizing the kit. By adopting the kit provided by the invention, the free DNA and RNA in the blood plasma or the blood serum can be rapidly and completely released, and denatured protein keeps a dissolved state; under the action of the adsorption solution, the free DNA and RNA are efficiently adsorbed on a silica gel absorption column; after the silica gel absorption column is washed by the washing solution, the free DNA and RNA with relatively high purity and concentration are obtained.

The invention belongs to a method for extracting lead-zinc oxide through oxygen enriched combustion by utilizing zincilate volatilization kiln. The process comprises the steps such as burdening, oxygen preparation, oxygen pressure storage, gas mixing, concentration adjusting, air supply and the like, wherein in the burdening link, the mass ratio of leaching slag to coal is 1:(35-45) and the mixture comprises 12-16wt% of carbon; in the volatilization process, slaked lime accounting for 5-10wt% of the mixture is added; in the gas mixing link, oxygen with the volume concentration of more than 90% and the oxygen supply pressure of 0.4-0.5Mpa is introduced, oxygen is mixed in a gas mixing tank at the head of the kiln, and the volume concentration of the mixed gas is controlled to be 25-45%; and in the volatilization link, lead-zinc oxide smoke is controlled to be volatilized and output at the temperature of 200-1350 DEG C. According to the invention, the carbon combustion condition of the volatilization kiln can be improved, the fuel consumption can be greatly reduced, the concentration of the oxygen in the volatilization kiln can be reasonably promoted, the carbon combustion efficiency can be improved, energy conservation can be achieved, the cost is lowered, and the metal volatilization ratio can be improved.

The invention discloses a cerebral aneurysm endovascular plastic repair bracket and a conveying device thereof, and solves a technical problem of treating small blood vessels and particularly cerebral aneurysm in a human body. The repair bracket is a netlike cylinder which is wove by elastic alloy wires with diameter of 30-50mum followed by heat treatment to form an elasticated net taking a cylinder shape in a free state, two end portions of the netlike cylinder is sparsely wove and a middle portion is closely wove to form a compact section. In the conveying device, a microcatheter is internally provided with a bracket folded in a straight line shape, a guide wire passes through the bracket, two ends of the bracket is connected with the guide wire by a pushing ring, and the bracket is the netlike cylinder. Compared with the prior art, the bracket composed of short diameter and soft alloy wires benefits isolating cerebral arteries bearing an aneurysm from a cerebral aneurysm neck, reducing thrombosis caused by impact of blood in the arteries bearing the aneurysm on the cerebral aneurysm body and separating the cerebral aneurysm body from the arteries bearing the aneurysm, thus the bracket is applicable to treatment of fusiform cerebral aneurysm.

The invention provides a feeding system for powdery polyolefin catalyst, and belongs to the field of olefin polymerization reaction. The system comprises a catalyst storage tank (1), an intermediate tank (2) and a fan (3), wherein the catalyst storage tank (1) is connected with the intermediate tank (2) by a pipeline (10); an automatic valve (5) is arranged on the pipeline (10); the fan (3) and the intermediate tank (2) form a circulating loop via a pipeline (12); the part, which is close to the top part of the intermediate tank, on the pipeline (12) is provided with an outlet which is connected with a back system (4) by a pipeline (13); an automatic valve (7) and an automatic valve (8) connected with each other in series are arranged on the pipeline (13); a quantitative tube is arranged between the automatic valve (7) and the automatic valve (8); and gas blowing pipelines are respectively arranged at the outlets of the automatic valve (7) and the automatic valve (8). The feeding system provided by the invention has the advantages that solid catalysts are stably and precisely controlled to be added in a reaction system under normal pressure and low cost.

The invention provides a domestic sewage separator, which comprises a cuboid sewage treatment box, wherein a filtering plate is arranged in the sewage treatment box in an inclined way; filtering holes are uniformly distributed in the filtering plate; a stirring and scraping device is arranged above the filtering plate; a hole cleaner comprises a hole cleaning tube, bearing support trolleys, inclined rails, a rope, a winch and pressure sensors; the two inclined rails are symmetrically arranged in the sewage treatment box, and are arranged under the filtering plate in parallel; bulges are arranged on the hole cleaning tube; the two ends of the hole cleaning tube are arranged on the bearing support trolleys through a rotating shaft; the bearing support trolleys are glidingly arranged on the inclined rails; one end of the rope is connected with the bearing support trolleys, and the other end of the rope is connected with the winch after bypassing a pulley; the pressure sensors are arranged at the top end and the bottom end of the inclined rails; a bottom plate is arranged in the sewage treatment box in an inclined way. The domestic sewage separator has the advantages that the structure is compact and reasonable; the sewage filtering effect is good; insoluble garbage sundries can be effectively separated; sundry residues in the filtering holes can be automatically cleaned.

The invention provides a drum screen capable of automatically and intermittently cleaning screen cloth. The drum screen comprises a motor, a speed reducer, a drum device, a rack, a cleaning device and a brush. The drum device is installed on the rack in an inclined mode. The motor is connected with the drum device through the speed reducer via a coupler. The cleaning device is composed of the brush, an eccentric shaft, a large chain wheel, a small sprocket and a transmission chain; the large chain wheel which is installed on a main shaft of the drum screen is connected with the small sprocket which is fixed to the eccentric shaft through the transmission chain; the brush is fixedly installed on the eccentric shaft. According to the drum screen, the screen cloth of the drum screen can be automatically and intermittently cleaned, so that it is guaranteed that the screen cloth is clear, labor intensity of a worker is mitigated, and screen efficiency is improved; meanwhile, it is also avoided that the brush makes contact with the screen cloth all the time, abrasion between the drum screen and the brush can be effectively reduced, and production cost is lowered.

The invention provides an efficient domestic sewage separation device, which comprises a hollow cylindrical sewage treatment tank with a cover plate at the top end, a filter vat, a stirring scraper and a hole cleaning barrel, wherein the filter vat is arranged at the center of the sewage treatment tank, filter holes are uniformly distributed in the side wall of the filter vat, a sundry opening is formed in the bottom of the filter vat and the top end of the filter vat is connected with a first rotating shaft; the first rotating shaft is driven by a first motor; the bottom of the sewage treatment tank is connected with the lower segment of the filter vat through an annular bottom plate which inclines towards the center of the inner side; the stirring scraper is arranged in the filter vat and comprises a second rotating shaft and a spiral plate arranged on the second rotating shaft; the second rotating shaft is driven by a second motor; and the hole cleaning barrel is arranged at one side of the filter vat, the top end is rotationally connected with the cover plate through a third rotating shaft and bumps matched with the filter holes of the filter vat are uniformly distributed on the side wall. The efficient domestic sewage separation device has the advantages that the structure is compact and reasonable, the sewage filter effect is good, insoluble waste sundries can be effectively separated, sundry residues in the filter holes are automatically cleaned and the filtering efficiency of the filter device is ensured.

The invention relates to non-wood fiber continuous cooking method and device. A suction filter plate is arranged on a cooking pipe of the traditional horizontal-pipe continuous cooking device so that cooking liquor can be charged into the cooling device again after being sucked through the suction filter plate and then heated through an external heat exchanger, therefore the purpose of indirect heating is realized; an intermediate pipe completing cooking is internally provided with a replacement filter plate; hot black liquor contained in pulp is replaced with cold black liquor, therefore cold blow is realized, and meanwhile the blown pulp achieves the degree of pulp washed by a vacuum pulp washer by replacing washing pulp; the suction filter plate and the replacement filter plate can be replaced and disassembled; the suction filter plate is self-cleaned depending on propeller scrapers of a screw shaft and is also provided with a back flushing device for forcible periodical cleaning; the replacement filter plate is cleaned depending on a stainless steel brushes positioned on rotary wings of a vertical type discharger and is also configured with back flushing liquid for forcible periodical cleaning; and the self-cleaning and the forcible periodical back flushing of the filter pates can ensure the smoothness of filter plate holes, therefore the purpose of continuous pulping is realized.

The invention provides a GPS (Global Positioning System) mobile base station rapid positioning and resolving method. A wireless communication network and a data transfer server are used for being coupled with a mobile base station and a GPS receiver in a flow base station, a corresponding coordinate system is built, further rapid positioning on the mobile base station is realized, the mobile base station and the flow base station are connected in a data transfer manner, and the mobile base station can move freely, thus coverage area of the mobile base station can be effectively adjusted. Besides, the GPS mobile base station rapid positioning and resolving method provided by the invention can effectively avoid a barrier between the mobile base station and the flow base station, a communication link between the mobile base station and the flow base station is ensured to be smooth, and efficiency for positioning the mobile base station is improved.

The invention relates to the technical field of sewage treatment, and particularly discloses a domestic sewage treatment device with a waste residue collecting function. The device comprises a box body, a water tank, a driving motor, a hollow rotating shaft, a rotating joint, a cleaning rod, a brush, a filter screen, a supporting seat and a nozzle. A supporting seat is fixedly mounted in the middle of the top end of the filter screen. The bottom end of the hollow rotating shaft rotationally communicates with a second water conveying pipe through a rotating joint. A residue collecting groove isformed in the upper surface of the filter screen. The water inlet end of the nozzle is connected with the second water conveying pipe. A supporting rod is fixedly mounted on the hollow rotating shaft. A cleaning rod being parallel to the filter screen is fixedly arranged on the support rod. Under the cooperation of the driving motor, the cleaning rod, the first water conveying pipe, the hollow rotating shaft, the rotating joint, the water pump, the second water conveying pipe and the nozzle, waste residues formed after sewage is filtered are easy to clean, smoothness of meshes in a filter screen is guaranteed, and therefore the sewage treatment efficiency is effectively guaranteed, and the device is suitable for application and popularization.

The invention relates to a seaweed polysaccharide beverage, comprising the following materials: 0.05-0.25g / L of seaweed polysaccharide, 0.3-0.4g / L of oligofructose, 5.0-15.0g / L of glucosans, 0.002-0.004g / L of beta carotene, 1.5-3.0g / L of milk powder, 0.08-0.15g / L of pectin, 0.08-0.15g / L of carboxymethyl curdlan, 0.01-0.15g / L of sodium carboxymethylcellulose, 3.0-15g / L of sugar, 5.0-20.0 g / L of malt sugar, 0.015-0.15g / L of fruit juice, 0.5-3.0g / L of honey, 0.01-0.25g / L of citric acid, 0.02-0.15g / L of malic acid, 0.1-0.3g / L of sodium citrate and 0.01-0.05g / L of potassium sorbate. Adding water to the components for diluting to a constant volume of 1L, and thus obtaining the seaweed polysaccharide beverage. Through certain recipe design, the seaweed polysaccharide beverage has the advantages of good taste and good stability, and also is multi-functional and has very good health care function.

The invention discloses a double-faced melt impregnation method and device for continuous long fiber reinforced thermoplastic resin. The method comprises the steps of firstly carrying out pre-dispersion and preheating on continuous long fibers, then carrying out comprehensive packaging and infiltration by virtue of a double-faced distribution runner, carrying out fiber re-dispersion processing, and sending the treated fibers out of a fiber channel. The device is characterized in that a fiber pre-dispersion region, a resin-infiltration fiber region and a fiber re-dispersion region are arranged in the fiber channel in a melt impregnation machine head, wherein the double-faced distribution runner is arranged in the resin-infiltration fiber region and comprises an upper-layer distribution runner and a lower-layer distribution runner which are structurally symmetrical; a pre-dispersion device is arranged in the fiber pre-dispersion region, and a re-dispersion device is arranged in the fiber re-dispersion region. According to the double-faced melt impregnation method and device, an impregnation effect of resin melt to continuous long fiber bundles is balanced, purposes of complete cladding, permeation and infiltration are achieved, a phenomenon that the single sides of the fibers are not tightly clad is avoided, the long-time continuous stable production is realized, and the yield and the quality of a product are substantially improved.

The invention discloses a power supply method and device based on a POE (Power Over Ethernet) switch and the POE switch. The method comprises the steps of: detecting whether PDs (powered device) of all ports of the Ethernet power supply POE switch are in place, and obtaining the ports where the PDs are in place; dividing the obtained ports into at least two groups, wherein at least two ports are arranged in each group; and providing power for the PDs of the ports in each group according to a set time interval, wherein the power is concurrently provided for the PDs of the ports in the same group, and the value of the set time interval is not greater than the value of an overload protection time. The scheme disclosed by the invention ensures that all the ports where the PDs are in place can be supplied with the power, a POE system is stable and a network is smooth, and all the ports can be normally supplied with power before being overloaded.

The invention discloses a highway. An unmanned intelligent patrol system comprises an unmanned aerial vehicle flight control system, an LED road condition display screen system, an aerial automatic pile swinging system and a charging pile duty platform that are all cooperatively controlled by an unmanned aerial vehicle data center and a monitoring command center. The system can be used for carrying out patrolling on the expressway in all weather, and has extremely high reliability. The condition of the road surface can be effectively helped to be dredged when an accident occurs on the expressway, and early warning measures can be carried out, so that the occurrence of secondary accidents is prevented, the safety of the personnel property is ensured, and the personal safety of the rescue workers and the police officers is greatly improved.

The invention relates to a scraper type floor dung clearing system and a construction method thereof. The scraper type floor dung clearing system is characterized in that the system comprises a plurality of hutches which are formed in a way that fences divide a breeding house along the longitudinal direction, forming the hutches; dung ditches are arranged below the dung discharge areas of the hutches; two or more than two cross beams, stretching across the dung ditch, are arranged at intervals inside each hutch; a floorboard is set up on the cross beams; a gap used as a dung outlet is arranged between the end parts of every two adjacent hutches, and a sheltering body is arranged above the dung outlet; each hutch is provided with a dung scraper inside; the dung scrapers are connected in series through a connecting piece to form a dung scraper group; and the dung scraper group is connected with an actuating unit through a transmission mechanism. The scraper type floor dung clearing system is widely applicable in livestock dung clearing process and is particularly suitable for use in the process of clearing the dung of housed pigs.

The invention relates to secondary productivity development of old wells and shut-down wells in oil fields and provides a window opening and sidetrack drilling short-radius horizontal well and reverse circulation well cementing and water plugging method. The method mainly includes the following six steps that: 1) a window opening point is selected; 2) a well trajectory is designed; 3) a whipstock is positioned and set; 4) casing window cutting operation is performed; 5) well trajectory control is performed; and 6) well completion operation is performed. The method of the invention can be applied to the secondary development of a part of low-yield wells and scrapped shut-down wells, can effectively obtain stored oil and residual oil in dead corners in uncontrolled areas of old wells, and can restore and improve single well production and ultimate recovery efficiency.

The invention provides a wall-mounted air conditioner indoor unit. The wall-mounted air conditioner indoor unit comprises a shell, a heat exchanger, an air injection assembly, a first air supply assembly and a second air supply assembly, wherein the shell comprises a cover enclosure and a front panel arranged on the front portion of the cover enclosure; the top wall and the sidewalls of the coverenclosure are all provided with air inlets, and the lower portion of the front panel is provided with an oblong air supply outlet; the heat exchanger is provided with a first heat exchange section anda second heat exchange section; the air injection assembly is arranged in the air supply outlet and comprises a first air injection part and a second air injection part which are arranged transversely; the first air injection part and the second air injection part are used for injecting airflow in the air injection parts forwards and driving ambient air in air suction holes defined by the inner peripheral walls of the air injection parts to be sent forwards; the first air supply assembly is used for producing first heat exchange airflow flowing in from the air inlets, conducting heat exchangewith the heat exchanger and then supplied into the first air injection part; the second air supply assembly is used for producing second heat exchange airflow flowing in from the air inlets, conducting heat exchange with the heat exchanger and then supplied into the second air injection part. By adopting the wall-mounted air conditioner indoor unit, the air supply amount is increased, and the indoor temperature is lowered uniformly.

The invention discloses a cooking appliance with a frying function, belongs to the field of kitchen household appliances, and solves the problems of uneven heating temperature, poor taste of food materials and the like of the existing air fryer and other cooking appliances with related functions. The cooking appliance with the frying function comprises a pot body and a pot cover, wherein the pot body has an upper open cooking chamber, a frying basket contained in the cooking chamber, and a ventilation gap is formed between the frying basket and the cooking chamber. The pot cover is provided with a hot air device including a fan, and a plurality of arc-shaped wind guide ribs are radially distributed between the bottom of the frying basket and the bottom of the cooking chamber. The bending direction of the arc-shaped wind guide ribs coincides with the rotating direction of the fan. Through the arrangement of the arc-shaped wind guide ribs, the hot air fluidity in the ventilation gap is improved, the wind energy loss is reduced, and the hot air circulation is accelerated, so that the purpose of uniform and efficient heating is achieved.