132results about How to "Solve difficult problems" patented technology

The invention relates to a single-end fault ranging method based on initial reversed-polarity directional traveling wave detection, which can effectively realize single-end traveling wave fault ranging and has high reliability and high accuracy. The method comprises the following steps: (1) when a traveling wave fault ranging device is started, testing the arriving time t1 of the line modular component of the initial traveling wave of a fault, and extracting traveling wave signals in the time interval [0, 2L/v], wherein L indicates the length of the line, and v indicates the wave speed of theline module component; (2) testing the initial reversed-polarity directional traveling wave in the time interval, calculating the difference of the arriving time of the line modular component of the initial reversed-polarity directional traveling wave and the arriving time of the line modular component of the initial traveling wave of the fault, determining whether the fault is a nearby fault or a remote fault with reference to Curve Chart 3, and accordingly determining the section with the fault point; (3) judging the properties of the second arriving wave head through the determined fault section; and (4) determining final ranging results through the initial traveling wave and the wave head of the second traveling wave of the fault.

The invention discloses a semisynthesis cutting fluid for magnesium alloy. According to the invention, the hidden danger of fire hazard in the process of magnesium alloy processing is totally avoided by using an environment-friendly water-soluble system; excellent reasonable proportioning of additives and combined application of corrosion inhibitors effectively prevent the surface of processed magnesium alloy from corrosion and blackening; designing of a low foam type formula enables generation of foam in the cutting fluid for the magnesium alloy to be totally inhibited; application of a delicate low-foam surfactant enables the problem of difficult cleaning of workpiece surface due to excessive oil stains to be overcome; application of an additive with resistance to hard water enables hard water-resistance of the fluid to be effectively improved, the fluid has hard water-resistance of 15000 ppm, allowing the service life of the fluid to be prolonged, all the indexes of the fluid reach or exceed relevant indexes in GB6144-2010, anti-rust performance lasts for more than 72 h per sheet, and the life cycle of the fluid is more than 8 months, 3 to 6 times the life cycle of magnesium alloy cutting fluid on the market; and reasonable design of an environment-friendly formula enables the problems of difficulty in treating waste liquid and the like to be effectively overcome.

The invention discloses a ceramic reinforced metal matrix abrasion-resisting compound material and a preparation method. The compound material comprises a metal matrix abrasion-resisting component body, wherein a plurality of blind holes are formed on the surface of the metal matrix abrasion-resisting component body, and self-fluxing alloy powder metallurgically bonded with the metal matrix abrasion-resisting component body and ceramic sintering bodies are arranged in the blinding holes. At a sintering temperature of a vacuum furnace, the self-fluxing alloy powder is fused and is metallurgically bonded with the abrasion-resisting component body while the abrasion-resisting component body and the ceramic are not deformed. The process is simple and the prepared material with a required hardness can be acquired without being subjected to the heat treatment. By using the preparation method, the problem that the ceramic is difficult to be bonded with a metal substrate is solved and the defect caused by a pouring process is avoided. The ceramic, alloy and metal on the surface of the abrasion-resisting component are regularly distributed, the abrasion resistance of the abrasion-resisting component is ensured and the shock resistance is also ensured.

The invention relates to multi-specification automatic chopstick painting equipment and method. The method comprises the steps of: (1) inserting chopsticks in boards in rows in a vibrating way; (2) supplying the boards in an automatic stepping way and supplying empty boards by pressure; (3) overturning the boards and moving the chopstick boards in a positioning way; (4) vertically immersing in paint and guiding and correcting chopsticks; (5) supplying paint by circulating pressure; and (6) moving the chopstick boards upward and scraping paint off at a rubber opening. The invention has the advantages that one set of equipment can make work load of 26 workers and can replace manual painting operation efficiently, reduce labor intensity and greatly improve labor productive power; the consumption of paint raw material is saved; the length of the blank of the chopstick is shortened; the utilization rate of specification draw material is improved; the bottleneck effect of the output improvement of the chopstick enterprises can be broken down; production output can be improved; product quality can be stabilized; and labor cost and raw material cost can be reduced.

The invention relates to a process for preparing boric acid ester brake fluid comprises synthesizing esterification liquid, preparing base liquid, and preparing brake fluid. The process according to the invention can overcome the problem of high cost of the current brake fluid and influence of unstable esterification hydrolysis caused by polyethers and excess boric acid esterification, and can provide fine anti-corrosive protection for various metals.

The invention discloses a fluorinated and electrolytic reactor and a reaction method. The reactor includes an electrolytic reaction still, electropads, negative and positive electrode outlet terminals, negative and positive electrode fitted rods, an upper clip, a lower clip, a rotation shaft, a generator and a flow guide ring. Every electropad of similar shape is superposed according to presupposition distance, the middle portion is equipped with at least a first-deflector hole and every first-deflector hole forms into a first-diversion trench. Every electropad is provided with a pair of negative and positive fitted holes which are inserted by the negative and positive fitted rods to fix the electropads and are fixedly connected with every clip. The rotation shaft is fixedly connected with the upper clip, and the generator is connected with the rotation shaft. The electrolytic solution between the electropads can flow orderly by rotating the electropads. The invention has the advantages of simple contracture, convenient assembling and disassembling and high volume rate. The product of the reactor is easy to be controlled and be outlet, which enables the reaction product to better collected and be discharged, improves the productivity of the product, and enlarges the variety of the fluorinated product of electrolytic reaction and the range of use of the electrolysis trench. Besides, the invention also solves the problem that the fluorinated electrolysis trench is difficult to be made bigger.

The invention discloses an ultrasonic flaw detection method of an austenitic stainless steel sheet weld joint. The ultrasonic flaw detection method comprises the following steps of: 1, selecting a phased array ultrasonic flaw detection device; 2, making a reference block by adopting the same material, and determining a material, a shape and a size of the reference block; 3, detecting and debugging the reference block by using the phased array ultrasonic flaw detection device, and screening artificial flaw detection echoes and noise waves; and 4, carrying out sector-scanning on a workpiece by using the phased array ultrasonic flaw detection device, accurately positioning and quantitatively screening doubtful echoes so as to confirm whether the doubtful echoes are flaw echoes. According to the ultrasonic flaw detection method of the austenitic stainless steel sheet weld joint, various flaws in the stainless steel sheet weld joint can be rapidly and effectively detected.

The invention relates to a method of Paris genus rapid propagation technique and seedling exercising, planting, comprising filtering a high grade individual system, sterilizing and tissue culture, wherein seedling exercising is the key to increase success ratio of the plant. The invention first performs Paris genus seedling exercising using microelement, causing the seedling exercising success ratio to reach 80%, thereby ensuring planting success ratio to reach 80%. The seedling exercising comprises: putting regeneration young seedlings in a culture medium added with vitamine and phytohormone, then adding microelement for cultivation and transplantation. The planting method comprises: transplanting the young seedlings through seedling exercising in sterilized prescription coil culture bag, when the newly put forth terminal bud develops into the blade, namely transplanted to the outside for insect control. The inventive technology and method ensure coherence of the germchit quality, ensuring high quality seed source of the Paris genus. The success ratio of the seedling exercising reaches 80%. The main root is thick and fibrous roots are increase, adaptability is strong in the field, the success ratio of the field reaches more than 80%, which solves problems of uneasy radication, immature seedling exercising technique, uneasy survival of planting. The invention is characterized by short vegetative cycle, low in production cost, good in quality and has scale production.

The invention discloses a preparation method of a covalent organic framework/carbon nitride composite material and application thereof. Firstly, a covalent organic framework material is synthesized byusing p-phenylenediamine and triformyl phloroglucinol as synthetic monomers through a room-temperature solid-phase method, then the covalent organic framework material and carbon nitride are mixed, stirred and dried in methyl alcohol, and pyrolysis is carried out under the protection of inert gas to obtain a target product. The covalent organic framework/carbon nitride composite material disclosed by the invention is large in specific surface area, high in nitrogen doping amount and rich in pore structure and can effectively remove toxic organic pollutants in water by constructing a novel Fenton-like system, and new application of the covalent organic framework material in the field of catalysis is expanded; unavoidable metal ion leaching in the activating process of a metal nano catalystis overcome; and the preparation method has the advantages of simple process, easiness for repeated operation, controllable structure, suitability for large-scale production and the like.

The invention belongs to the technical field of graphene preparation, and discloses a method for preparing graphene solution based on supercritical carbon dioxide and pyrenyl polymers. Graphites of 10 to 20 mg and the pyrenyl polymers of 15.4 to 30.8 mg are dispersed in dimethyl sulfoxide of 5 to 10 ml; then obtained suspending liquid containing the graphites and the pyrenyl polymers is put in a supercritical carbon dioxide reaction device, is stirred and reacts for 3 to 6 hours under the temperature ranging from 40 to 45 DEG C and the pressure ranging from 12 to 16 MPa, and then is processedthrough pressure relief; obtained liquid reactant is separated to remove supernatant; sediments are repeatedly washed through solvent so as to remove unreacted pyrenyl polymers, and then are dispersed in the same type of solvent renewedly; and finally, the graphites that are not exfoliated are removed, and then graphene solution is obtained. The method solves the problem that high-concentration uniform graphene solution is difficult to prepare at present, can achieve the high-yield and high-quality preparation and the functionalization of graphene in one step, can enable the output of non-defective graphene layers to be high to 51.8 wt percent, and is a simple and effective method for preparing graphene solution.

The present invention relates to the technical field of Internets, and discloses an app channel menu displaying method and apparatus, and a mobile terminal. The method comprises the following steps: acquiring a trigger operation for displaying a floating ball on a display interface of an app; acquiring an operation position of a trigger operation, and determining the display position of the floating ball on the display interface of the app according to the operation position; displaying the floating ball at the display position; and opening the preset app channel menu at the corresponding position of the floating ball. According to the technical scheme of the present invention, by acquiring the operation position of the trigger operation and displaying the floating ball, and opening the app channel menu at the corresponding position of the floating ball, the position of the app channel menu display can be adjusted, and one-hand operation and switching can be facilitated.

The invention discloses an organic garbage decomposing bacterium agent, as well as a preparation method and an application of the organic garbage decomposing bacterium agent. The bacterium agent is composed of 55-60% by weight of I compound bacterium agent and 40-45% by weight of II compound bacterium agent, wherein the I compound bacterium agent as well as the II compound bacterium agent are composed of bacterium liquid and a carrier, and respectively adsorbed on the carrier by the bacterium liquid; and the ratio of the bacterium liquid to the carrier is 2-3 hundred million bacteria to per gram of the carrier. The organic garbage decomposing bacterium agent is uniformly added according to 0.5-1% of the weight of an organic garbage heap; and the synergistic effect of various bacteria is capable of effectively accelerating the decomposition speed of the organic garbage and improving the quality of produced organic fertilizer. Due to use of the organic garbage decomposing bacterium agent, the pollution problems such as wastewater overflow, odor smell and mosquitoes flying around caused by the organic garbage stacking are effectively solved, and high-quality organic fertilizer can be produced.

The invention discloses a method for preparing a coconut-flavor boiled salted duck. The method comprises the steps of material selection, cleaning, picking, dry-salting, integral marinating, re-marinating, blank drying, cooking, quenching, drying by airing, and sterilization packaging. The method disclosed by the invention has the advantages that on the one hand, the adopted coconut powder, coconut shreds and coconut juice endow the boiled salted duck with a new flavor, and the coconut juice contains proteins, amino acids, vitamins, fats and minerals which are different with those in poultry products and contains more low carbon chain fats which are beneficial for the human body, therefore, the prepared coconut-flavor boiled salted duck meets the health consumption concept and nutrition view of the modern people; and on the other hand, the silicate mineral water is taken as raw materials and catalysts, therefore, the trophic structure of the boiled salted duck product is enriched, andas an effective flavor modified catalyst, the silicate mineral water optimizes the flavor of the boiled salted duck; meanwhile, the problem that the traditional boiled salted duck is difficult to be tasty, short in quality guarantee period and difficult to keep the flavor is solved, and the prepared boiled salted duck is delicate in taste, delicious in meat, good in flavor and high in nutritionalvalue, and has a certain health care effect.

The invention discloses a multi-stage slurry separation method for construction of a slurry shield machine in fine particle stratum. An independent slurry treatment system is used in the multi-stage slurry separation method and comprises a pre-sieving assembly, a primary cyclone assembly, a secondary cyclone assembly, a residue storage yard, two slurry tank assemblies, a centrifugal machine assembly and a press filter assembly, wherein the two slurry tank assemblies are divided into a use group and a standby group and can be mutually switched for use; when slurry which meets demands and carries residue soil is discharged from the slurry shield machine, fine particles with the diameter being 20 mu m or larger are separated and enter the residue storage yard after being treated by the pre-sieving assembly, the primary cyclone assembly and the secondary cyclone assembly, residual slurry enters a slurry tank of the use group to be recycled, the slurry tank of the use group is stopped and a slurry tank of the standby group is started when the specific gravity or viscosity of the slurry of the use group does not meet the construction demands, at the moment, solid particles with the diameter being 20 mu m or smaller and clear water are separated from the slurry of the use group via the centrifugal machine assembly and the press filter assembly, and the clear water is stored for recycling.

The invention discloses a combined treatment method for high-standard discharge of papermaking wastewater, which solves the difficult problem of papermaking wastewater. The technical solution includes the following steps: physical and chemical treatment of papermaking wastewater after deslagging, separation of sludge and water, and promotion to PAFR reactor for hydrolysis and acidification reaction, after hydrolysis and acidification, the effluent flows into the improved oxidation ditch system, and after separation of cement and water from the oxidation ditch, it is promoted to high-grade The oxidation system flows into the final sedimentation tank after coagulation reaction after dosing, and the supernatant is discharged up to the standard. The method can make the effluent CODCr≤70mg/L after the papermaking wastewater is treated, basically reaching the higher industrial wastewater treatment control standard.

The invention discloses a grinding aid for preparing a cementing material for filling and dry stacking of mines. The grinding aid comprises the following raw material components in percentage by mass: 20%-30% of modified polymeric glycol, 5%-15% of diethanolisopropanolamine, 10%-20% of molasses, 5%-10% of sodium sulfocyanate, 5%-10% of sodium metaaluminate, 5%-10% of sodium fluosilicate and the balance of water. According to the grinding aid provided by the invention, the problems that a mixed material of water granulated slag, quick lime, water glass and the like is liable to cause ball pasting and is difficult to be finely ground in a grinding process are solved, the fluidity of the cementing material can be remarkably improved, the grinding efficiency of a ball mill can be improved, the machine-hour yield of the ball mill can be increased, the early strength of the cementing material can be remarkably improved, and the long-term strength of the cementing material can be properly improved.

The invention relates to wear-resistant super-hydrophobic paper and a preparation method thereof. The preparation method comprises the following steps: (1) preparing nano silicon dioxide particles; (2) enabling the nano silicon dioxide particles prepared in the step (1) to be mixed with hydroxylation carbon nano tubes, and performing super-hydrophobic modification; (3) enabling AKD to be dissolvedin ethyl alcohol or heptane solution; (4) enabling the nano silicon dioxide particles prepared in the step (2) after the super-hydrophobic modification to be mixed with a mixture of the hydroxylationcarbon nano tubes and AKD solution prepared in the step (3), and preparing emulsion; (5) enabling the emulsion prepared in the step (4) to be sprayed on paper through modes of spraying, coating or spin-coating; and (6) drying the paper prepared in the step (5). The prepared wear-resistant super-hydrophobic paper still keeps a good hydrophobic property after a friction test in a certain pressure.The provided preparation method for the wear-resistant super-hydrophobic conductive paper is simple, a process is easy to control and production cost is lower.

The invention relates to a pipe punching machine. The pipe punching machine comprises a base and an installing base installed on the base, the installing base is provided with a punching device, and the base is provided with a workpiece clamping device and a workpiece lifting device which act in cooperation with the punching device. According to the pipe punching machine, automatic punching without manual intervening can be achieved, the problem that waste is difficult to discharge during punching is solved, the pipe punching precision is improved, the labor intensity of workers is relieved, the production efficiency is high, and the yield is high.

The present invention relates to an organic wastes gasification pyrolysis multiple coproduction integrated treatment process. Said process includes the following steps: physical pretreatment: feeding broken organics for gasification into gasification furnace to make gasification; discharging produced high-temperature gasified combustible gas from gasification furnace; heating pyrolysis furnace to pyrolysis temperature, feeding broken organics for pyrolysis into pyrolysis furnace to make pyrolysis reaction to produce oil-gas mixture and solid carbon; making oil-gas mixture undergo the process of heat exchange and be reached to proper temperature for making catalytic pyrolysis to make catalytic pyrolysis; feeding discharged oil-gas mixture into oil-gas fractional equipment so as to obtain fuel oil, non-condensable combustible gas and residuum.

The invention discloses an oxide diluted magnetic semiconductor/ferroelectric heterojunction structure which consists of the following three layers: a base layer is a substrate; a middle layer is an oxide diluted magnetic semiconductor film and an upper layer is a ferroelectric film. The substrate is Si, sapphire, SrRuO3 or other perovskite oxide substrates; the oxide diluted magnetic semiconductor film is large energy gap oxide films of ZnO, TiO2 or SnO2 doping with transition metal elements of Mn, Fe, Co, Ni or Cr; the ferroelectric film is films of lead zirconate titanate, Nd-Bi titanate or barium strontium titanate. The invention also discloses two preparation methods of the oxide diluted magnetic semiconductor/ferroelectric heterojunction structure, namely, a pulsed laser deposition method and a sol-gel method. The oxide diluted magnetic semiconductor/ferroelectric heterojunction structure can carry out non-volatile modulation of ferromagnetism under the effect of an applied electric field and can be widely applied to the fields of electronic computers, spin electronics and non-volatile memorizers.

A method and apparatus for producing water from air by utilizing of a hydrophilic-hydrophobic bonding structure include a housing provided with a substrate for dividing a cavity in that housing into acold zone flow channel and a hot zone flow channel. The substrate is provided with a semiconductor refrigeration sheet, the hot end face of the semiconductor refrigeration sheet is in contact with the radiating fin, and the cold end face of the semiconductor refrigeration sheet is in contact with the condensing fin. The air enters the cold zone flow channel, contacts with the low temperature surface of the condensing fin, and condenses into liquid droplets in the hydrophobic area of the surface of the condensing fin. Liquid droplets can spontaneously migrate from the hydrophobic region to thehydrophilic region of the surface of the condensing fin and concentrate in the wetting channel of the hydrophilic region, and then is discharged from the surface of the condensing fin through the action of gravity, and the condensing water slips off the condensing fin to obtain liquid water. As that condense surface combines the characteristic of bead condensation in the hydrophobic area, water droplets easy to slide and liquid droplets easy to collect in the hydrophilic area, and the condense water is discharged in time through the hydrophilic wetting channel, the technical difficulties of high air condensation power consumption and difficult collection are solved.

The present invention relates to one kind of conductive polyaniline/piezoelectric ceramic powder composite material and its preparation process. The composite material is prepared with piezoelectric ceramic powder 50-150 weight portions, aniline monomer 10 weight portions, oxidant (NH4)2S2O8 20-25 weight portions, and 1.0 ml/l concentration hydrochloric acid solution as the doping acid solution 500-1000 weight portions. The present invention has the features of good machining performance and high electric energy-to-heat energy conversion rate.

The invention discloses a preparation method of an oily sewage treatment agent for petrochemical industry, and belongs to the technical field of sewage treatment. The preparation method comprises the following steps: 1), taking 1 part of montmorillonite, 1 part of water and 1 part of sulfuric acid; 2) mixing and activating the raw materials in the step 1), and performing plate-frame press filtration to obtain a montmorillonite stock solution; and 3) adding anhydrous aluminum hydroxide, a catalyst and sulfuric acid into the montmorillonite stock solution, and activating; and after the activation process in the step 3) is carried out for 1 hour and the content of aluminum oxide is qualified, continuously activating for 1 hour to obtain a finished product solution. According to the invention, with the agent containing the aluminum hydroxide, the sulfuric acid, the catalyst and the montmorillonite stock solution, the difficult problem that COD, SS, petroleum and total phosphorus are difficult to degrade is solved, the wastewater treatment process of the whole petrochemical industry is further improved, the problem of poor treatment effect of an existing sewage treatment agent (aluminum polychlorid, polyferric sulfate, aluminum sulfate) and other products is solved, and the problem of difficult load operation of later biochemical treatment is solved.

The invention discloses a double-coil coupled multi-wave exploration system comprising a transmission control system. A first pulse signal output terminal group of the transmission control system is connected with a main transmitting coil and a second pulse signal output terminal group of the transmission control system is connected with a slave transmitting coil. The main transmitting coil and the slave transmitting coil are coupled coils and are overlapped. A receiving coil module is arranged at the edge of the main transmitting coil and the receiving coil module and the main transmitting coil are intersected partially; and the partial orthographic projection of the main transmitting coil and the partial orthographic projection of the receiving coil module are overlapped. The double-coil coupled multi-wave exploration system has the following beneficial effects: alternate detection of the deep part and the shallow part can be realized; for the shallow detection, the current turn-off time is short; the losses are low, the detection precision is high, and the work efficiency is high; the structure is simple and the mobility is high; the main transmitting coil and the receiving coil module are intersected partially and thus the mutual inductance influences between the main transmitting coil and the receiving coil are cancelled, so that the exploration precision is improved.

The invention relates to the technical field of batteries, in particular to a colloidal power lead-acid battery inner formation process, comprising the steps of adding a colloidal electrolyte to a battery and standing for 0.5 to 1 h, wherein the formation procedure comprises a ten-charge phase, an alternating nine-discharge phase, a rest phase, and an acid extraction stage. The process in the invention effectively solves the problem that the power type colloidal battery is difficult to be completely formed, can ensure the uniformity of formation of the anode plate of the colloidal battery, fully converts the active material, and improves the inner formation quality of the colloidal battery. At the same time, the total formation time of the process is 27~51h before the 9th discharge capacity detection and matching discharge, and the total net charge is 3.4-8.75 times of the rated capacity, which reduces the battery charge electric quantity and formation time, enhances the effective charge electric quantity of the battery, improves the production capacity of the power colloidal batteries, reduces the cost of battery production, increases production efficiency and improves the competitiveness of batteries in the market.

The present invention provides a wisdom garden management system. The system comprises: a data layer module configured to obtain wisdom garden data and store the wisdom garden data to a wisdom gardendatabase; a service layer module configured to publish the wisdom garden data in the wisdom garden database as service information through middleware; and an application layer module configured to generate a computing instruction according to the service information. Correspondingly, the invention further provides a wisdom garden management method. The wisdom garden management system and method changes a traditional urban garden labor management mode, and change manual pipe-dragging spray irrigation at fixed time and fixed places to a mode of intelligent control of sprayer spraying according to the newest actual measurement environment so as to achieve accurate irrigation, save human cost, improve water resource utilization rate and achieve urban garden low-carbon management.

The invention discloses a rape straw covering method for preventing and controlling rice field weeds, which adopts rape pod dry, rape straw, or the mixture of the two and is covered with soil before the direct seeding of rice or before and after transplanting so as to effectively prevent the harm of rice field weeds. The rape straw covering method for preventing and controlling rice field weedscomprises the steps of A. taking rape pod dry, rape straw, or the mixture of the two as covering; B. selecting any of the following ways according to the type of rice field: the first way. in water direct seeding rice field and dry direct seeding rice field, uniformly spreading 300-1100g/m2 covering from the sowing day until the twentieth day; the second way, in transplanting rice field, machine inserting rice field, or throwing rice field, uniformly spreading 300-1100g/m2 covering before the transplanting, or from the day after transplanting or throwing until the twentieth day; first spreading in the rice lines, and then spreading evenly in the rice field to cover the soil surface; avoiding overwhelming the rice seedling.

The invention aims to solve the problem that the connection of the existing automobile heavy-load connector affects the protection of a cable, and discloses an improved automobile heavy-load connectorcapable of improving a cable protection effect. The connector comprises a male plug body and a female plug body. The surface of the male plug body is sleeved with a first sleeve. A first fastening screw is fastened between the first sleeve and the male plug body, a first connecting block is bonded to the surface of the first sleeve, a first cable penetrates out of the right side of the male plugbody, a first ventilation box is bonded to the right side face of the first sleeve, and the surface of the female plug body is sleeved with a second sleeve. Driving of the hydraulic cylinder is reasonably utilized; inflation and deflation of an air bag belt are realized; the male plug body and the female plug body can be plugged and unplugged through cooperation of a spiral spring, melting or adhesion caused by long-time cooperation is avoided, the male plug body and the female plug body can be conveniently and rapidly separated and closed, design is reasonable, operation is convenient and useis safe and reliable.

The invention relates to an ultrasonic visible gastrointestinal tube. Clinically, a gastrointestinal tube is difficult to insert to a required position indeed, so that clinical treatment effects are affected seriously. The ultrasonic visible gastrointestinal tube aims to solve the problem that a clinician hardly can insert a gastrointestinal tube successfully at present. The ultrasonic visible gastrointestinal tube is characterized by comprising a gastrointestinal tube body; the gastrointestinal tube body is of a double-cavity structure; the double-cavity structure of the tube body comprises a nutrition tube cavity and an infusion tube cavity, wherein the nutrition tube cavity is formed in the middle of the tube body, the infusion tube cavity is formed in the outer circumference layer of the nutrition tube cavity and used for water injection, the two ends of the nutrition tube cavity are open, one end of the infusion tube cavity is provided with an infusion opening, and the other end of the infusion tube cavity is of a closed structure; a spherical bag is arranged at the position, at the closed end of the infusion tube cavity, of the gastrointestinal tube body, and the spherical bag is communicated with the infusion tube cavity. Under the real-time guidance of ultrasound, the ultrasonic visible gastrointestinal tube solves the problem that the clinician hardly can insert the gastrointestinal tube successfully, and has the advantage of being ultrasonically visible.

The invention provides a threshing device, a combined harvester equipped with the threshing device and a control method. The threshing device includes diameter adjusting devices which are installed between supporting spoke plates and used for adjusting the diameter of a threshing drum through eccentric slider mechanisms. Each diameter adjusting device includes a power system, a sleeve, turntables,connecting rods and synchronous wheels, wherein the connecting rods are respectively fixed to the two ends of a threshing toothed bar, the connecting rods are installed in a radial sliding manner onthe supporting spoke plates, the sleeve is installed outside a drum shaft, the two ends of the sleeve are respectively in transmission connection with the turntables, a number of grooves are evenly distributed on the turntables, a movable synchronous wheel is installed in each groove, each synchronous wheel is connected with the corresponding connecting rod, and the connecting rods can move in theradial direction on the supporting spoke plates through the rotation of the turntables. During the harvesting of grains of different varieties and different levels of maturity, the adaptability of the threshing device of the combine harvester is greatly improved, and the production efficiency of the combine harvester is improved.